AF908 User Manual - Midnight Design Solutions
Contents
1. AF 908 DSP Audio Filter User Guide v1 0 Type C to clear out memory See the C character echoed to the screen and the HCmon gt prompt displayed again Type L to load new program See message waiting Pull down the File gt Send File menu Navigate to where you saved the s19 file Once in the folder that contains AA_908v4 0 s19 file select that file and click the Open button Be careful to only load S19 files If you mistakenly select any other file extension it is highly likely that you ll mess up the bootstrap loader program See line after line of ASCII data displayed in short one second bursts This will continue for about 2 minutes until the entire program has been sent to the Micro908 and flashed into its memory DO NOT INTERRUPT THIS PROCESS When it is complete the HCmon gt command prompt will be displayed again Disconnect the serial cable and restart the Micro908 i e turn the power off and on again to start the newly loaded program You will observe the new version number presented in the sign on display AF 908 DSP Audio Filter User Guide v1 02. c Low Allows you to set the filter low frequency d Toggle Notch Toggle the state of the autonotch filter Set Widths CW For each mode there are three widths that are remembered narrow mid and wide At any time DSP908 is running you can cycle through these widths without changing anything else by successive presses of pushbutton 2 The defaults are for CW and SoftCW which are considered the same mode 100 250 800 Hz for RTTY 200 300 1000 Hz and for SSB 300 1600 300 1900 and 200 2500 Hz This function allows you to change these defaults In all modes you get a menu of Wide Mid and Narrow Once you select one of these it becomes context sensitive For SSB you enter first the low cut and then the high cut frequency each from a menu of choices For the other modes you enter just the width The first value you will see is the current setting In this case since these setting do not immediately affect the current filter settings you do not hear the effect as you turn the dial Gain You can set the digital gain in each of the three mode specific filters as well as the denoiser and the autonotch filters and the CODEC itself You will get a menu selection for each of these possibilities The initial value presented will be the current value for the selected gain As you turn the dial you will hear the effect of the change You can select from a menu of gains is from 6 0dB to 18dB in 0 5dB steps For the CODEC it i
3. If there are no DSP programs in the SEEPROM or they have been overwritten by other software like Link908 you will see a message SRI No DSP pgms D L DSP pgm 1st will appear for 1 5 seconds and you will be taken to the Run menu item level where you can select Download to download a DSP image from the PC If the DSP download checksums don t match or the DSP program start command fails you will see this on the LCD DSP Run Failed And on the serial terminal if active you will see one of the following DSP download checksum failed DSP pgm failed to start This should not occur but might occur occasionally The cure for which is to try again If it occurs all the time it suggest a problem with the serial connection form the HC908 to the DSPx Check the modifications made in accordance with Appendix A Run w PC This function will also load the DSP with a program from the SEEPROM and start it running When you select this function you will get a menu listing the names of the DSP programs that are stored in the SEEPROM Once the program is running however the function differs from the Run function described above In this case the AF908 software steps out of the loop and lets the user control the operation of the DSP program from the PC serial terminal program The only action menu displayed on the Micro908 LCD is End DSP pgm Pressing the dial pushbutton will end the DSP program All other control is fro
4. Pressing pushbutton 4 will present a set of menus AF 908 DSP Audio Filter User Guide v1 0 View Battery Voltage This function displays the approximate voltage of the V power supply to the board Software Load This function transfers control to the serial port enabling the user to download a new control program to the Micro908 e g an updated AF908 s19 file or perhaps reloading the AA908 s19 program Manual Download This function is not recommended for general use Use the Download function available from the PB1 Main menu This form of download will download DSP images prepared by either the DSPimage or DSPterm programs using a serial terminal program like TeraTerm or HyperTerminal Getting these programs to do this is tricky hence the recommendation to not use this feature The reason that this is included is that on other platforms this may be the only option available The image file still must be prepared with DSPterm or DSPimage or an equivalent program When you select this option a message waiting for DSP pgm appears on the terminal At this point you send the image file With Hyperterminal it is relatively straight forward you send it as a text file even though it s a binary file The terminal settings of 0 msec char and 20 40msec line are fine You shouldn t have to change them from what you use to successfully download new Micro908 software It is more complicated on TeraTerminal In the
5. 1 PB1 to change the setting to the displayed value If you just wish to know the current setting then simply push PB1 as soon as you see the current value displayed Please Note that PB1 selects the choice not the dial pushbutton iii Mode This allows changing mode among the following menu choices a RTTY b CW 1 c SSB End DSP pgm This function resets the DSP ending the DSP program s execution and returns to Run menu item of PB1 Save Settings This saves the settings to EEPROM and returns to the change menu item This is the same as the save settings in the PB1 menu but is located here as well so that you can save changes to the filter settings while continuing to operate the DSP program AF 908 DSP Audio Filter User Guide v1 0 Pushbuttons 2 amp 3 Any time ASP is running in SSB or RTTY mode you can cycle the state of notch and denoiser by pushing PB3 mode to step successively through the 4 possible states In CW it is inactive Similarly you can cycle through the possible filter widths for the current mode by successively pushing PB2 This does not interfere with the use any other of PB2 amp 3 when ASP is not running at the moment there is no other use For each push of PB2 or PB3 the DSP is informed and the status line is updated ASP provides 9 filters 5 CW filters 3 SSB filters and 1 RTTY filter Each filter has a fixed width and a predetermined center as follows e CW 100 200 300 400 and 500 Hz
6. SSB High 1500 3000Hz in 100 Hz increments Gains CODEC 6 0dB to 6 0dB all others 6 0db to 18 0dB Denoiser Beta 0 99 Denoiser Decay 0 99 AutoNotch Beta 0 99 AutoNotch Decay 0 99 Taps 31 51 71 91 AF 908 DSP Audio Filter User Guide v1 0 Appendix D Developing DSP Programs for AF908 It is beyond the scope of AF908 to include a discussion of the art amp science of developing DSP programs for the DSPx Daughtercard However all the tools and basic data are available on the Micro908 CDROM in the directory KK7P DSPx Daughtercard The schematic for the daughtercard is in the subdirectory DSPx The data sheets for the DSP and all the major components on the daughtercard are in the Data Sheets directory Manuals for the DSP chip writing applications for the chip and the development tools software are in subdirectories of the ADI directory The development tools themselves are in the adi_dsp directory If you are going to re build any programs then this directory needs to be copied to your hard drive and the Path to the location where you copied the adi_dsp directory and several other Environment Variables need to be set Environment Variables can be set in Windows 98 via the autoexec bat file and in Windows 2000 and XP via Settings gt Control Panel gt System gt Advanced gt Environment Variables What needs to be set are SET path path F adi_dsp 21xx lib SET path path F adi_dsp 21xx bi
7. Send File file selection box you must choose the binary check box and you must change the terminal settings to 0 msec line These are different settings than for software download making this error prone on TeraTerm Load AA908 If you are running the integrated AA908 AF908 version of the software on your Micro908 then you will see this option Selecting this will end AF908 and load AA908 If you used Exit to leave a DSP program running it will continue to run with its current settings when AA908 loads and runs Note this feature is not available in AF908 versions prior to 1 2 Pushbutton 5 Direct This function provides a means to utilize any PC based software that supports a serial connection to the DSPx Daughtercard directly without the Micro908 platform software playing any part in the process For example it can be used to load the DSP directly from the PC using programs such as EzFast or EZLoad This function is principally of interest to those developing or modifying DSP programs When pressed you get a 2 item menu to choose from 1 Direct w Reset This function starts the direct serial mode after resetting the DSP chip Resetting the DSP chip activates the built in monitor program on the DSPX daughtercard PC programs can then interact over the serial port with the monitor to load and run DSP programs The AF908 software simply passes all serial traffic between the DSP and the PC acting only as a port to port bit repeate
8. are stored in the SEEPROM The names are the same names as the xxxxx exe files that were placed in the image by DSPterm less the exe extension The name xxxxx is truncated to 7 characters if longer than 7 characters By pressing the dial pushbutton the AF 908 DSP Audio Filter User Guide v1 0 selected program will be loaded into the DSP and started The LCD will display Loading DSP with Pgm gt xxxxx during the loading process Also if a serial terminal program including DSPterm is running you will see the following output during the loading process on the PC side DSP load start DSP alive test OK DSP download checksum OK DSP Pgm started OK DSP load complete If there is only one program in the DSP image pressing the dial pushbutton will directly run the program bypassing the redundant select program step Once the loading process is complete and the DSP program is running what you see next depends on which DSP program is running The DSP programs DSP908 and ASP are recognized and explicit operational support is provided for them This support is described in other sections For all other programs a single menu item End DSP pgm is displayed Pushing the dial pushbutton will terminate the DSP program and return to the Run menu item display where you may select among the 8 menu items described in this section Whether the program is DSP908 or ASP is determined based on the name The check is not case sensitive
9. fundamental importance to anyone wishing to learn more about the finer points of DSP and these principles may be considered the tools of the trade for working with DSP This not only applies to audio signal processing but also is becoming evident in contemporary digital radios For a complete description of ASP see http www arrl org tis info pdf 9609x008 pdf ASP doesn t have the same set of features and parameters as DSP908 but it is supported in a similar manner ASP is recognized by the AF908 software and after it loads which will take about 7 seconds when it runs you will see the following on the LCD C 200 700 Change The top line is again as status line In this case the first number is the width of the filter and the second number the center This is true for all modes CW SSB and RTTY For SSB you would see something like this S 2400 1500 Change A filter 2400Hz wide centered at 1500Hz At the change menu option you have three selection possibilities Change End DSP pgm and Save Settings These behave in a similar manner as they do for the DSP908 program AF 908 DSP Audio Filter User Guide v1 0 There are some significant differences ASP provides 9 filters 5 CW filters 3 SSB filters and 1 RTTY filter Each filter has a fixed width and a predetermined center as follows e CW 100 200 300 400 and 500 Hz wide at 700Hz center e SSB 1200 1800 and 2400 Hz wide at 1500Hz center e RTTY 200Hz wide at 2
10. image in SEEPROM and when you push the dial pushbutton it directly begins to load it without asking you to choose a program This load will take about 10 seconds AF 908 DSP Audio Filter User Guide v1 0 Step 3 Running the DSP908 Audio Filter When the load is complete and the DSP908 program begins to execute the behavior of the AF908 software is different It recognizes by the name of the program that you are running DSP908 and it has specific run time support for operating the DSP908 audio filter Now the LCD will look like this C 500 700 Change The top line is displaying the status of the running DSP908 filter C for CW 500 is the width in Hz and 700 is the center BFO Sidetone frequency For RTTY Data and soft CW the symbols R and c will appear along with width and center frequency For SSB the symbol will be S and the low and high frequency would appear like this S 200 2500 Change The Change menu item allows you to change various filter parameters Turning the dial clockwise the next option would be end DSP pgm Pressing the pushbutton here would end the DSP908 program and return to the Sel DSP Action Run level Rather than exiting go back CCW to the Change option and select it by pushing the dial pushbutton Now you will see the following on the LCD C 500 700 Filter The status line remains the same and will always display the current status of the filter until the DSP908 program execution i
11. providing the user interface for control of the instrument and for control of the internal DSPx card Two fully functional DSP audio filter programs are also included that allow the DSPx card to provide its comprehensive filtering capabilities One filter program provides capabilities similar to the Elecraft K2 s KDSP2 filter which also uses the DSPx daughtercard fully programmable audio filters for CW SSB and data RTTY PSK31 AMTOR et al The other filter program provides a robust suite of DSP filter programs such as a BFO an LMS denoiser a Wiener filter autonotcher and other filters using multi rate processing adaptive filtering and frequency shifting techniques Once one or more DSP programs have been loaded into the nonvolatile memory of the Micro908 the platform becomes a fully functional DSP filter that can operate independently of a PC In addition the tools necessary to modify and develop your own DSP applications are included in the package lann SEEPROM Audio Out NOS DSP Audio Filter gas O PB1 Serial Comm HC908AB32 on os MCU OPB3 Busy Spkr OvTune Headphones User Interface Block Diagram of the Micro908 AF908 Digital Audio Filter As can be seen above AF908 software does not utilize any of the RF paths in the Micro908 used previously by the Antenna Analyst software nor does it require the DDS card The AF908 control program running on the HC908AB32 control processor only utilizes the DSP dau
12. to know the current setting then simply push PB1 as soon as you see the current value displayed Please Note that PB1 selects the choice not the dial pushbutton a Noise Decay b Noise Beta 1 c Notch d Notch Decay 2 End DSP pgm This function resets the DSP ending DSP program execution and returns to Run menu item of PB1 Exit This function will exit to the very top level the Select Function command level which allows you to use the other pushbutton functions Currently only PB1 Main PB4 Config and PB5 Direct Serial are active at the select command level It leaves the current DSP program running with its current settings 4 Save Settings This saves the settings to EEPROM and returns to the change menu item This is the same as the save settings in the PB1 menu but is located here as well so that you can save changes to the filter settings while continuing to operate the DSP program Pushbuttons 2 amp 3 Any time the DSP908 DSP program is running in SSB mode you can cycle the state of notch and denoiser by pushing PB3 this will cycle successively through the 4 possible states In CW and softCW it toggles the denoiser For RTTY it is inactive Similarly you can cycle through the wide mid narrow widths for the current mode by successively pushing PB2 This does not interfere with the use any other use of PB2 amp 3 when DSP908 is not actively running at the moment there is no other use For ea
13. wide at 700Hz center e SSB 1200 1800 and 2400 Hz wide at 1500Hz center e RTTY 200Hz wide at 2210Hz center You can change the effective center by Adjust BFO this allows you to adjust the center frequency and has the effect of digitally shifting the center of the filter Because there are a limited number of widths the only width selection mechanism is via pushbutton 2 AF 908 DSP Audio Filter User Guide v1 0 11 Downloading DSP Filter Programs to the Micro908 The DSPterm PC program is used to get one or more DSP program stored on the Micro908 platform s SEEPROM The SEEPROM has 64k bytes of storage The 5 DSP programs provided together require only 15k bytes of storage The DSP programs produced using the ADI tools have an extension of exe They are not however in a form that can be directly loaded onto the DSP They are also in a very bulky form In the exe form the 5 programs would take 40k bytes of SEEPROM and require additional processing on the Micro908 platform The DSPterm utility program is provided to take one or more DSP programs in exe form and make a compact binary image that can be loaded on to the Micro908 s SEEPROM This same utility performs the PC side of the downloading process The DSPterm PC program is also a serial terminal program and may be useful for those who wish to develop their own DSP applications as well as other uses described later The DSPterm program can be run in two differe
14. 210Hz center You can change the effective center by Adjust BFO This allows you to adjust the center frequency and has the effect of digitally shifting the center of the filter This is very similar to IF Shift or Passband Tuning but is done at audio Pushbutton 2 will cycle through all the available widths for the current mode In SSB amp RTTY mode you can cycle the state of notch and denoiser by pushing PB3 to step successively through the 4 possible states In CW it is inactive AF 908 DSP Audio Filter User Guide v1 0 Reference Sections The section is divided into four parts The first describes the options of the AF908 software running on the Micro908 platform The second section describes the option for explicit operational support of the DSP908 DSP program running under the AF908 software The third section describes the option for explicit operational support of the ASP DSP program running under the AF908 software The fourth section covers the options of the DSPterm PC program Information on developing DSP programs is in Appendix D and a description of the format of the DSP image that is downloaded to the Micro908 and the PC program DSPimage exe is in Appendix E Appendix F describes the procedure to load the AF908 application software into the Micro908 hardware platform 8 Operating the AF908 Control Program on the Micro908 The AF908 software package supports the following functions 1 Downloading DSP program images from
15. AMERICAN QRP CLUB User Manual Micro908 DSP Audio Filter AF908 Revision 1 2a Contents Introduction Terminology Micro908 Hardware Notes Installing AF908 Software Components Running Your First DSP Program Basic Operation of the DSP908 Filter Program Basic Operation of the ASP Filter Program Reference Operating the AF908 Control Program on the Micro908 Reference Operating the DSP908 Filter Program 10 Reference Operating the ASP Filter Program 11 Reference Download DSP Programs to the Micro908 APPENDIX A Modifying the Micro908 PC Board APPENDIX B AF908 Package Contents APPENDIX C DSP908 Defaults amp Options APPENDIX D Developing DSP Programs for the AF908 APPENDIX E The DSP Image and Downloading DSP Programs from Other Platforms APPENDIX F Loading software into the Micro908 AF908 Digital Audio Filter for the Micro908 Steve Holton N1NB Lyle Johnson KK7P and George Heron N2APB User Manual written by Steve Holton N1NB 1 INTRODUCTION AF908 is a software package for the Micro908 kit produced by the American QRP Club that enables it to perform as an audio filter utilizing the popular KK7P DSPx Daughtercard This daughtercard is an optional component in the Micro908 and when combined with the AF908 control software it serves as a free standing portable and extremely programmable DSP that can be used to enhance the audio performance of an amateur radio receiver The AF908 software runs on the Micro908
16. IR EXE Simple DSP filter program 200 Hz wide at 600 Hz ASP EXE A DSP filter intermediate in complexity AF908 operational support is provided 2 The sources package contains the sources for the AF908 software the DSPterm amp DSPimage PC program and the DSP programs This is only needed for those wishing to modify the software or develop DSP programs 3 The development tools and reference materials can be found on the Micro908 CDROM in the directory KK7P DSPx Daughtercard AF 908 DSP Audio Filter User Guide v1 0 Appendix C DSP908 Defaults amp Options Default Settings Global Defaults AutoLoad off DSP908 Defaults Initial Mode amp Filter CW 500Hz Wide 600Hz Center CW Filter 500Hz Wide 600Hz Center CW Widths Narrow 100Hz Mid 250Hz Wide 800Hz RTTY Filter 1000Hz Wide 2200Hz Center RTTY Widths Narrow 200Hz Mid 300Hz Wide 1000Hz SSB Filter 200 2500Hz SSB Widths Narrow 300 1600Hz Mid 300 1900Hz Wide 200 2500Hz Gains denoiser amp CODEC 6 0dB others 0 0dB Denoiser Beta 89 Denoiser Decay 71 AutoNotch Beta 39 AutoNotch Decay 7 Taps 91 DSP908 Parameter Ranges CW Widths 50 800Hz in 50Hz increments CW Center 400 1000Hz in 50Hz increments 1100 1200 amp 1300Hz RTTY Widths 50Hz 100 1000Hz in 100 Hz increments 1200 2000 Hz in 200 Hz increments RTTY Center 1000 2500Hz in 100 Hz increments SSB Low Cut 0 100 600Hz in 50 Hz increments
17. P image file It s again necessary to run the DSPterm program on the PC in order to create an image file for the DSP908 program that will be subsequently downloaded to the Micro908 and stored in the nonvolatile memory SEEPROM Again locate the DSPterm program with the Windows Explorer and double click on it When prompted for a DSP program name type dsp908 exe Just hit enter when prompted for another DSP program You will see Com Port number or Enter if coml com using coml enter DSP program name or Enter when done dsp908 exe enter DSP program name or Enter when done AF908 DSP Image Build Steve Holton N1NB Adding dsp908 exe to image 0x1C6C bytes AF908 DSP Image Transfer amp Serial Console Steve Holton N1NB press Esc or Ctrl C to terminate This will build an image containing just the DSP908 program Upon seeing the Run menu Sel DSP Action Run turn the dial CW to the next menu selection which is Download and push the dial to select this function The download will take longer than before with the test programs or about 10 seconds as the program is considerably larger than clsin and clsin2 After the program is downloaded you are returned to the Run menu Step 2 Download DSP Image to the Micro908 Pressing the dial pushbutton this time will act differently than in the examples in the previous section In this case AF908 software recognizes that only one DSP program is loaded in the file
18. Pterm exe and DSPimage exe are provided For simplicity DSPterm and the five DSP programs should all be placed in the same directory 5 Running Your First DSP Program This section will describe the steps required to run the simple test DSP programs C1SIN and C1SIN2 and thereby checkout the proper installation of all the elements of the Micro908 AF908 system C1SIN generates a 1 000 Hertz tone on the Micro908 speaker and also delivers it to the audio output jack C1SIN2 generates two sine waves 700 and 1900 Hz You may need to adjust the Volume control on the Micro908 to hear the tones The AF908 software has a number of options and in this section we cover the basic ones needed to run the simple test programs More options will be covered in subsequent sections and a complete description of all options can be found in the Reference Section Step 1 Run DSPterm on the PC to create the DSP image file It s first necessary to run the DSPterm program on the PC in order to combine the desired DSP programs into a single image file that will be subsequently downloaded to the Micro908 and stored in the nonvolatile memory SEEPROM Throughout this manual all examples assume these files are located in a common directory Using the Windows Explorer navigate to the directory where you placed the programs and double click on DSPterm This will open a Command Prompt DOS window and run DSPterm which will prompt you Com Port number or Enter
19. ages DSP load start DSP alive test OK DSP download checksum OK DSP Pgm started OK DSP load complete Once the program has been loaded and started you should hear clsin generating two sine waves 700 and 1900 Hz on the piezo speaker You may need to adjust the Volume control on the Micro908 to hear the tones The LCD will display Sel DSP Action end DSP pgm If instead you see this on the LCD DSP Run Failed And on the serial terminal if active you see one of the following DSP download checksum failed DSP pgm failed to start You should retry it If retrying doesn t eliminate the problem you may have a problem with the modifications to the pc board described in Section 2 and Appendix A Recheck the modifications Step 4 Select C1SIN program to be run Pushing the dial pushbutton will end the current DSP program execution and silence the tones The only menu option when running a simple DSP program like this is end DSP pgm Upon pressing the dial pushbutton to end the program you will be returned to the Run menu option Pushing the dial pushbutton again will again show the program name clsin2 but turning the dial will show the name of the other program that was downloaded clsin With clsin on the LCD display press the dial pushbutton to execute this program which will produce a single 1000Hz sine wave signal Use the end DSP pgm command to again silence the output If you reach this point successfully you
20. and high frequencies for SSB as well as the denoiser notch state being displayed Nr denoiser active Nt notch active This status line remains until the DSP program ends and is updated with every change made The 2nd line has the 3 menu items 1 Change This allows you to change filter settings and presents a menu of i Mode CCW This allows changing mode among the following menu choices a RTTY b CW a C SoftCW Soft CW has gentler skirts than CW d SSB ii Filter 1 item displayed This allows changing filter settings and is context sensitive to mode When changing Width Center High or Low the first value you will see is the current setting Turning the dial CW lowers the value while CCW increases the value You will hear the effect of the change in the audio output as you turn the dial Once you select a changed value it will be reflected in the status line For CW and SoftCW you get the following menu choices a Width Allows you to set the filter width 1 b Center Allows you to set the filter center frequency c Toggle Noise Toggle the state of the denoiser filter For RTTY you get the following menu choices a Width Allows you to set the filter width 1 b Center Allows you to set the filter center frequency For SSB you get the following menu choices a Toggle Noise Toggle the state of the denoiser b High Allows you to set the filter high frequency 1 AF 908 DSP Audio Filter User Guide v1 0
21. ch push of PB2 or PB3 the DSP is informed and the status line is updated AF 908 DSP Audio Filter User Guide v1 0 10 Operating the ASP DSP Filter Program When the ASP program is run specific capabilities are active Once ASP starts running you see a status display on the top line of the LCD and a menu of commands available on the bottom line Commands are via the dial and dial pushbutton selection method as well as special functions enabled for PB2 and PB3 The top line looks like this C 200 700 Nr or R200 2210 or S 2400 1500 Nt That is the mode CW RTTY or SSB C R or S The width and center frequencies as well as the denoiser notch state being displayed Nr denoiser active Nt notch active This status line remains until the DSP program ends and is updated with every change made The 2nd line has the 3 menu items 1 Change This allows you to change filter settings and presents a menu of i Taps CCW The denoiser offers 4 choices for the number of taps in the filter The default number is 91 The choices from this menu are 31 51 71 and 91 ii Adjust BFO 1 item displayed This allows changing center BFO frequency for the mode of the current filter When you select Adjust BFO you will see the current value on the second line of the LCD Rotating the dial will change the value Pushing the dial pushbutton while rotating the dial will move the cursor under the digits Once you have the desired value push pushbutton
22. er software control programs to run on it thus allowing it to serve as numerous different test and measurement instruments for the ham operator merely by loading a new software control program into its memory AF908 This is the software program that runs on the Micro908 s internal HC908 Daughtercard to provide user interface control LCD pushbuttons dial as well as control of the internal DSPx Daughtercard DSPx Daughtercard This is an optionally purchased hardware component inside the Micro908 that is required for AF908 to function It gets loaded with the DSP programs described next to provide the audio filtering capabilities DSP908 The primary DSP software program that runs on the DSPx Daughtercard This software is initially loaded into the nonvolatile SEEPROM memory of the Micro908 and can be automatically loaded into the DSPx card RAM memory each time the unit is powered up The DSP908 software is the audio processing engine that enables the entire Micro908 to serve as a powerful audio filter ASP This is the secondary DSP software program that one can select for loading and running on the DSPx Daughtercard It provides a set of additional audio filters for advanced use of the Micro908 AF908 C1SIN and C1SIN2 These are two test software programs for the DSPx that one first loads to test and demonstrate proper assembly and installation of the DSP and audio path components in the Micro908 platfor
23. erial terminal program as well This may useful at least initially if any problems are encountered It will run until you type Ctrl c or ESC AF 908 DSP Audio Filter User Guide v1 0 Appendix A Modifying the Micro908 PC BOARD The serial connections between the DSP daughtercard and the HC908 are reversed and the traces must be modified before the DSP can be used 1 J9 pin 10 from the daughtercard should go to pin 2 of U6 the level converter not to the anode of D11 2 J9 pins 11 12 should go to the anode of D11 not to pin 2 of U 6 Step 3 Solder the wires to D11 and U6 Figure 1 Top side of PCB Step 2 Solder thin insulated wires to J9 at the pins shown here and put wires through the holes Figure 2 Bottom side of PCB AF 908 DSP Audio Filter User Guide v1 0 Appendix B AF908 Package Contents The AF908 software is packaged in three parts Only the executables part is required for normal operations The other two parts consist of the sources and the development tools amp reference materials 1 The executable package consists of 7 files 1 AF_v01 S19 the AF908 software to be installed on the Micro908 platform DSPterm exe the PC program for building amp downloading DSP program images CISIN EXE Simple DSP program producing 1000Hz tone CISIN2 EXE Simple DSP program producing 700 amp 1900Hz tones DSP908 EXE Sophisticated DSP filter program with AF908 operational support CIF
24. es produced by the ADI tools supported by AF908 can be found on the AA908 CD ROM Look in directory KK7P DSPx Daughtercard then directory ADI then directory swtools release 5_1 and open asm1 pdf Go to page 146 in the acrobat application page B 2 in the book and you ll find all the details Note this is not the same format that is produced by some of the more recent ADI tools like VisualDSP The tool set used by AF908 is the last free set from ADI See Appendix D AF 908 DSP Audio Filter User Guide v1 0 Appendix F Loading software into the Micro908 This appendix overviews a way the user can load an updated software program into the Micro908 as provided on the project s Internet web site BACKGROUND Increasingly today microcontrolled projects have an ability to be field updated with new capabilities and software updates made available by the designer So instead of needing to send your instrument back for re programming to get these new features you can now simply download the program update from the Internet and send it to the Micro908 and the instrument automatically updates its internal memory with the new program What a great way to keep your project completely up to date with the latest features PC REQUIREMENTS e Windows 95 Windows 98 Windows 2000 and Windows XP e Works with computers ranging from 33 MHz Intel 486 processors up to 2 4 GHz P4 processors An available RS 232 serial port USB to RS232 adapt
25. ghtercard the SEEPROM nonvolatile memory for storage of the programs to be run on the AF 908 DSP Audio Filter User Guide v1 0 DSPx card and the user interface hardware of the instrument itself pushbuttons LCD dial and audio paths After the preliminary instructions for getting the Micro908 updated and the AF908 software installed this User Manual will guide you on how to run a simple DSP program and verify that all the components of the AF908 system are working The manual will then cover the basic operations of the two DSP software components DSP908 and ASP There are many options available in the AF908 software package some of which will only be used by a few users or used very infrequently so we have included a complete reference covering all the available options Appendices describe the contents of the AF908 package the default values for all the options information on developing DSP programs for the Micro908 AF908 system and information on the format and protocols for downloading DSP programs to the Micro908 2 TERMINOLOGY There are many terms and acronyms used in this project and it might be a good idea to become familiar with them in order to fully understand the rest of this manual Micro908 This is the revolutionary hardware platform designed by the AmMQRP Club N2APB and N2CX and introduced in 2004 with its inaugural software program AA908 Antenna Analyst The flexible design of the Micro908 allows oth
26. have confirmed that all the basic elements needed for AF908 are installed and working Occasionally you will get an invalid response instead of OK The reason for this remains a mystery and as long as the remaining lines are OK there is no problem AF 908 DSP Audio Filter User Guide v1 0 6 Basic Operation of the DSP908 Filter Program The DSP908 program is a powerful DSP audio filter that is functionally equivalent to the program for the Elecraft KDSP2 also provided by KK7P DSP908 provides a set of audio filters that are ideal for enhancing the listening experience for CW data RTTY PSK31 AMTOR et al and SSB modes Full programmability is provided for the filters center frequency filter widths skirt slopes gain taps notch and decay parameters making this an extremely versatile component for the radio shack An excellent paper describing the design decisions reasons that the KDSP2 DSP908 code is the way it is can be found at http www elecraft com KDSP2 kdsp2design pdf As previously mentioned the DSP908 software has numerous options and parameters Extensive support is provided by the AF908 software running on the Micro908 to control the operation of this program In this section we will only describe the basic options needed to get started productively A complete description of all the options and default settings is covered in the Reference Section Step 1 Run DSPterm on the PC to create the DS
27. his may be of interest to anyone who wants to create and or download DSP images to the Micro908 from a device other than a Windows PC DSPimage exe This program is the image building part of DSPterm exe Its syntax is similar DSPimage d xxxx exe d yyyyy exe d zzzz exe o aaaa bbb Where d xxxx exe is the name of a DSP program to be included in the image Up to 10 DSP programs may be included in the image o aaaa bbb is the name of the image file to be saved on the PC The default if no name is specified is DSP bin DSP Image Format The DSP image file produced by either DSPterm or DSPimage consists of a directory table of contents followed by data representing the DSP programs contained in the image The data representing the DSP programs is not a simple copy of the exe files Such files are not in a form that can be loaded onto the DSP The following describes the format of the directory and the form of the DSP programs within the image All binary values are stored Big Endian format in the image Directory Fixed part 8 bytes offset 0 DSP signature SdSp offset 4 Program count of DSP programs in this image offset 5 Total byte count NN 16 bits in file excluding checksum offset 7 First directory entry of up to 10 max Up to 10 directory entries 12 bytes long offset 0 Program name Max 7 characters null offset 8 Offset within image of start for this program 16 bits offset 10 total number of bytes for th
28. if coml com You can enter the COM port for the Micro908 Enter only the digit i e a 3 for COM3 Like this Com Port number or Enter if comi com 3 lt Typethe 3 and hit Enter If the Micro908 is on com1 then you only need to hit Enter You will then be prompted for the name of a DSP program Type c1sin exe and hit Enter You will then be prompted for another DSP program type clsin2 exe and hit Enter When next prompted for a dsp program just hit Enter The window will now look like this AF 908 DSP Audio Filter User Guide v1 0 Com Port number or Enter if coml com 3 using com3 enter DSP program name or Enter when done clsin exe enter DSP program name or Enter when done clsin2 exe enter DSP program name or Enter when done AF908 DSP Image Build Steve Holton N1NB Adding clsin exe to image 0x0246 bytes Adding clsin2 exe to image 0x0267 bytes AF908 DSP Image Transfer amp Serial Console Steve Holton N1NB press Esc or Ctrl C to terminate At this point the DSPterm program has built an image containing the two programs clsin exe amp clsin2 exe is ready to download them the Micro908 An error message you might see at this point instead of the last two lines shown above is Com Port failed to open in Use by another program press Enter to end program This probably means that the program TerraTerm HyperTerminal etc you used to install the AF908 software is still running and continues to contro
29. is program 16 bits Program Data Following last directory entry the DSP programs begin Each program is in the form of a series of command blocks Each command block must be 256 bytes in length or less so that each fits in the 256 byte SEEPROM buffer in the Micro908 Each command block consists of a command followed by data There are two commands AF 908 DSP Audio Filter User Guide v1 0 SDPxxyy Program memory instructions 24 bit words initialized Data memory 16 bit words xx load address 16 bits yy of 24 bit instructions 16 bits zz of 16 bit data words 16 bits The Program memory instructions or Data memory data immediately follow the command Each command block must be contiguous with the previous command block for that DSP program The handling of the interrupt vectors is a special case The first 3016 4810 program words in a DSP program starting at DSP program memory offset 0000 must be re directed to 3FC016 The DSP s monitor program will re locate the interrupt vectors from 3FC016 to location 0000 before starting the DSP program That is the command block for the first 3016 program words must have 3FC0 6 in the address part of the command not 0000 which is what is in the exe file End Following Program Data Insert padding as needed to make file NN bytes multiple of 3 offset NN 6 byte count for file NN same values as at offset 5 offset NN 4 DSP signature dSp offset NN 24 bit check sum on en
30. l the com port End that program then press enter and repeat the process of double clicking on DSPterm exe When you successfully reach this point leave the DSPterm program running It has built an image and is ready to transfer it to the Micro908 Step 2 Download DSP Image to the Micro908 Power on the Micro908 with the AF908 software installed After the battery voltage display you will see the following on the LCD Sel DSP Action Run Turn the dial clockwise to the next menu selection which is Download Pushing the dial pushbutton will select the download function In the command prompt window on the PC you will see the following messages Request send DSP image 0004D7 bytes to AF908 DSP Image transfer complete The LCD will return to the run menu Sel DSP Action Run Step 3 Select C1SIN2 program to be run Pushing the dial pushbutton now will select the run function and you will now be asked to select which of the two DSP programs you downloaded clin or c1sin2 you wish to run The LCD will appear like this Select DSP pgm clsin2 Pushing the dial pushbutton will cause the clsin2 program to be loaded from the Micro908 s nonvolatile memory to the DSP and it will start You will briefly see on the LCD the following Loading DSP with Pgm gt clsin2 AF 908 DSP Audio Filter User Guide v1 0 If the DSPterm program is still running on the PC you will also see in the command prompt window the following mess
31. m These programs are ported to the DSPx from the excellent book Experimental Methods in RF Design available from the ARRL No QRPer s bookshelf is complete without this tome AF 908 DSP Audio Filter User Guide v1 0 C1FIR This is a simple DSP filter program that was also are ported to the DSPx from Experimental Methods in RF Design It may be of interest to those wishing to develop their own DSP programs DSPterm This is the software program used on the PC to initially load the DSP programs DSP908 ASP C1SIN C1SIN2 into the Micro908 non volatile memory Additionally this program provides an optional way for the operator to interactively control the Micro908 and DSPx functions from the PC keyboard Micro908 O08 pe Control Processor AE OOS Serial po Cable nonvolatile mem DSP908 ASP DSPx card DSP908 ASP _C1SIN C1SIN2 Component Block Diagram Shows where software components in red reside and how they are utilized in the overall Micro908 AF908 system Micro908 HARDWARE NOTES 1 A minor pc trace modification on the Micro908 pc board must be done before the DSP is usable See Appendix A for the details and a method of making the required modifications The audio inputs on the Micro908 are both stereo jacks The DSP audio filters provided with the AF908 package all process just one channel left as input In the Micro908 this corresponds to the tip of the 3 5mm 1 8 plug This sh
32. m the PC Both DSP908 and ASP allow control from the PC The other sample programs provided in the AF908 package do not Note If the DSP program immediately puts out a message on the serial terminal it may be missed as the AF908 software takes a moment to configure the serial port pass through function On AF 908 DSP Audio Filter User Guide v1 0 the other hand if the DSP program is waiting for input from the serial terminal there is no problem Auto Load It is possible with this function to cause the Micro908 to load and run a specific DSP program at power on instead of first coming to the initial Run menu With this function you are given a menu of the names of all the DSP programs that are in SEEPROM Pushing the dial pushbutton when the desired program is showing will cause this to be remembered and the name of the program will be saved in EEPROM so that at the next power on this program will be run If there is only one DSP program in the SEEPROM the program selection step is bypassed The selected program will not run at this time Instead you are returned to the Run menu item At power on a check is made to ensure that the program is still in SEEPROM It is considered to still be there if the program name appears in the same slot in the directory of programs in SEEPROM as it was when selected with this option If the DSP program is no longer present you will see the Auto Load Failed DSP PGM Missing message displayed f
33. n SET path path F adi_dsp 21xx etc SET path path F adi_dsp 21xx include SET ADI_DSP F adi_dsp SET ADIL PATH F work SET ADII F adi_dsp 21xx include F work inc Where F is the drive or path to which you copied the adi_dsp directory You need to create the work and inc directories They do not need to be in the same path as the adi_dsp directory For each DSP program included that is named xxxxx there is a file makexxxx bat which will make the DSP program It should be noted that these tools are the last free tools set from ADI and they run in a Command Prompt DOS window The resulting DSP programs they produce are in the format that the DSPterm program can process Later ADI tools such as VisualDSP that came with later Ez Kit Lite DSP evaluation kits produce a different format DSP program executable file which is not supported by the DSPterm program If any one wants to tackle that the format of the DSP image file is provided in Appendix E Also note that the Ez Kit Lite contains a different CODEC than the DSPx card The program C1FIR may be of interest as it contains conditional assembly code for both CODECs and is also a useful skeleton to begin writing DSP filters AF 908 DSP Audio Filter User Guide v1 0 Appendix E The DSP Image and Downloading DSP Filter Programs from Other Platforms This section describes the format of the DSP Image and a PC utility DSPimage exe that will produce an image file T
34. nt ways If you double click on it in Windows Explorer or start it at the prompt in a Command Prompt or Dos Window with no command line arguments it will prompt for parameters Alternatively you can provide parameters on the command line Running with command line parameters offers some additional options This section will describe the full set of parameters available when running at the command prompt When no parameters are present on the command line the only parameters available are com port and DSP program file names as described in Section 5 Step 1 and Section 6 Step 1 DSPterm exe PC program running in a Command Prompt window as described below enables the programs full function If you plan to use the serial terminal features you ll want to increase the number of lines of scrolling available This is the Screen Buffer Size Height in the Properties gt Layout message box The DSPterm program is started by typing the following at the command prompt DSPterm comN d xxxx exe d yyyyy exe d zzzz exe o aaaa bbb Where comN is the optional comport where the Micro908 is attached The default is COM1 d xxxx exe is the name of a DSP program to be included in the image Up to 10 DSP programs may be included in the image o aaaa bbb is the name of an optional image file to be saved on the PC If an image file had been previously saved then the usage can be like this DSPterm comN i aaaa bbb Where comN is the optional comport whe
35. one frequency to match your personal preference The Center option is the first CCW at the Width menu item level Having customized your preferences you might wish to save them to EEPROM so that they will be available each time you run the program You do this by selecting the Save Settings option which is the second CW choice at the Change option level It is also an option at the Run menu item level At the Run menu item level you can restore all the original default settings with the Default Settings choice This completes an introductory tour of the operating controls for the DSP908 program With this you should be able to put this program to productive use A full description of all the options range of parameters and default values is in the Reference Section 7 Basic Operation of the ASP Filter Program The ASP Audio Signal Processor DSP filter program by Johan Forrer KC7WW was first described in the September 1996 QEX It has influenced a number of subsequent DSP programs including DSP908 The ASP software consists of several components a digital beat frequency oscillator BFO selectable band pass filters for CW SSB and other digital modes a denoiser based on the least mean squares LMS technique and a Wiener filter autonotcher removing carriers or heterodynes Several advanced concepts are applied such as multirate processing adaptive filtering and frequency shifting These all are of
36. or 1 5 seconds and the Run menu item appears If there are no DSP programs in the SEEPROM then you will see the SRI No DSP pgms D L DSP pgm 1st message The functions available once the program starts running are the same as described in Run above NO Auto Load This function cancels any startup load set by the previous function Then the Run menu item appears Default Settings This function re establishes the default settings and saves them to EEPROM There are global settings and settings specific to the DSP908 and ASP DSP programs The specific settings are discussed in the discussion of the specific program support below The only global setting at the current time is whether and what program would automatically load on startup Save Settings This saves the current global and specific settings to EEPROM Note If you change the Startup Load option described above the change is always updated in EEPROM There is no need to do a Save Settings to reflect this Exit As has been described above all the previous functions return you the Run menu item remaining at this level of commands This function however is your escape It takes to the very top level the Select Function command level which allows you to use the other pushbutton functions Currently only PB1 Main PB4 Config and PB5 Direct Serial are active at the select command level Pushbutton 4 Config
37. ors may work for those computers having only USB based serial ports A dumb terminal emulator program such as TeraTerm provided on the Micro908 Resource CDROM USAGE 1 Download the latest Micro908 software from the project website located at http www amarp org kits micro908 Save the S19 file in a known location on your PC e g your desktop folder The S19 file is the file with the s19 extension to its filename This is a text representation of the binary image to be loaded onto the Micro908 Connect your Micro908 to the PC using a standard straight through male female DB9 type serial cable Do not use a null modem cable that swaps pins 2 and 3 from end to end Start up the TeraTerm program on your PC If not already set up configure the communications as 9600 8N1 no flow control in the Setup gt Serial Port menu and be certain to have the line delay set to at least 40ms line Make sure that you have TeraTerm configured to be using the active serial port in your PC Be certain that no other program has control of the serial port e g if your Palm HotSync program is running as evidenced by its icon in the system tray in the lower right of the screen you must quit that program by right clicking the icon and select exit Issue the Update Software command on the Micro908 located as an option under the CONFIG menu See the debug monitor program called HCmon display its sign on message
38. ould eliminate potential problems of stereo plugs and mono sources The DSP908 and ASP filters put their filtered output on both channels The C1FIR filter puts the original signal on the right channel and the filtered output on the left channel For complete information about the hardware please refer to the Micro908 Technical Reference Manual located on the project web page at www amarp org kits micro908 AF 908 DSP Audio Filter User Guide v1 0 4 Installing AF908 Software Components The AF908 software must be installed on the Micro908 This operation will replace any previously loaded programs like AA908 Calibration data and user settings from AA908 are preserved when AF908 is loaded and run You can install the AF908 s19 file on the Micro908 using the same techniques as previously used with the Antenna Analyst Any of the methods described in Appendix F can be used This is the same information that is in the Micro908 Antenna Analyst Operating Guide available on the project web page www amarp org kits micro908 Once the AF908 s19 file is loaded into the Micro908 the PC program DSPterm exe is used to load the DSP programs on to the Micro908 as described in the next section DSPterm may be run by double clicking the filename in the Windows File Explorer window or for more flexibility in a Command Prompt DOS window Five DSP programs DSP908 exe ASP exe C1SIN exe C2SIN exe and C1FIR exe and two PC programs DS
39. r To break out of this mode press the dial pushbutton and you will be returned to the Select Function menu Note this function performs no loading of the DSP Direct No Reset This function starts the direct serial mode without resetting the DSP chip This means that the DSP needs to already have been loaded utilizing the AF908 software functions This in effect commanders the serial traffic of a running DSP program The AF908 software AF 908 DSP Audio Filter 15 User Guide v1 0 then simply passes all serial traffic between the DSP and the PC acting only as a port to port bit repeater To break out of this mode press the dial pushbutton and you will be returned to the Select Function menu Note this function performs no loading of the DSP This is intended principally for DSP program development AF 908 DSP Audio Filter User Guide v1 0 9 Operating the DSP908 DSP Filter Program When the DSP program being run is DSP908 specific operating capabilities are active Once DSP908 starts running you see a status display on the top line of the LCD and a menu of commands available on the bottom line via the dial and dial pushbutton selection method as well as special functions enabled for pushbutton 2 and pushbutton 3 The top line looks like this C 500 700 Nr or R200 2200 or S 200 2500 Nt or c 100 800 Nr That is the mode CW RTTY SSB or Soft CW C R S or c The width and center frequencies for CW softCw amp RTTY or the low
40. re the Micro908 is attached The default is COM1 i aaaa bbb is the name of an image file previously saved on the PC AF 908 DSP Audio Filter User Guide v1 0 Once you invoke the DSPterm program and it builds the image file leave it running It is also the DSP image transfer program that will transfer the image to the Micro908 when requested to do so by the AF908 software on the Micro908 Below is sample output from these first steps of running DPSterm D micro908 utility gt dspterm d asp exe d dsp908 exe d clsin exe AF908 DSP Image Build Steve Holton N1NB Adding asp exe to image 0x1609 bytes Adding dsp908 exe to image 0x1C72 bytes Adding clsin exe to image 0x0246 bytes AF908 DSP Image Transfer amp Serial Console Steve Holton N1NB press Esc or Ctrl C to terminate Leaving the program running you can then use the AF908 software down load function to download the DSP programs to the Micro908 and store them on its SEEPROM The download function is described in the next section When the download function is executed you will see this additional output from DSPterm Request send DSP image 0034F4 bytes to AF908 DSP Image transfer complete If you continue to leave the DSPterm program running and then use the AF908 run command you will see this additional output from DSPterm DSP load start DSP alive test OK DSP download checksum OK DSP Pgm started OK DSP load complete This is because the program is a s
41. s 6 0dB to 6dB in 1 5dB steps If any gain is set too high or the filter is over driven loud and unpleasant distortion may result These gain controls are provided to allow balancing audio levels They are not designed to increase receive system gain for amplification of low signal levels Taps The denoiser offers 4 choices for the number of taps in the filter The default number is 91 The choices from this menu are 31 51 71 and 91 The initial value presented will be the current value As you turn the dial you will hear the effect of the change Exit This function will exit to the very top level the Select Function command level which allows you to use the other pushbutton functions Currently only PB1 Main PB4 Config and PB5 Direct Serial are active at the select command level It leaves the current DSP program running with its current settings Decay Beta This allows the setting of the decay rate hold time and beta aggressiveness for the denoiser and autonotch They are expressed as number between 0 and 99 When you select one of the following to change you will see on the second line of the LCD the current value Rotating the dial will change the value Pushing the dial pushbutton while rotating the dial will move the cursor under the digits Once you have the desired value press pushbutton 1 PB1 to change the setting to the AF 908 DSP Audio Filter User Guide v1 0 displayed value If you just wish
42. s ended There are a number of options at this level The first in the CCW direction is Mode which allows you to change to SSB RTTY or soft CW mode The first option in the CW direction is Set Widths the meaning of which will be described later If you have moved the dial return to Filter and select it Now you will see C 500 700 Width Selecting this will now show this C 500 700 500 This will allow you to change the width of the filter Turning the dial will display choices from 50 to 800 Turning the dial CCW will widen the filter while CW will narrow it Turn the dial CW As you turn the dial you will hear the effect of the change in the audio output When you reach 150 select it by pushing the dial pushbutton This will change the width and take you back to the Change level and the LCD will look like this C 150 700 Change A very common function is to change the widths of the filter For each mode there are three widths which the AF908 software remembers narrow mid and wide You can rotate through them by successive pushes on Pushbutton 2 Push PB2 three times and observe the width on the status line change between 800 250 and 100 with each push If you prefer some other AF 908 DSP Audio Filter User Guide v1 0 set of widths you can change them via the Set Widths option which is the first CW option atthe Filter menu item level You might also want to change the Center BFO Sidet
43. the PC to SEEPROM 2 Running a DSP program stored on SEEPROM 3 From the Micro908 platform provide explicit operational support to control two of the provided DSP programs DSP908 and ASP To control from the PC the operation of a DSP program via a serial terminal if the DSP program provides this function Pushbutton 1 Main AF908 Control Menus Pressing Pushbutton 1 will take you to the initial AF908 menu Note that when you power up the Micro908 with the AF908 software installed you will be taken directly to this initial AF908 menu This menu can also be invoked later by pressing pushbutton 1 This menu offers 8 choices which are selected by turning the dial and pressing the dial pushbutton when the desired function is displayed The menu item displayed first is Run The 8 functions available are 1 Download This function requests the download of a DSP program image file from the DSPterm program running on the PC DSPterm must already be running and waiting for this request If it is not the Micro908 will hang waiting for the PC When the download is complete the menu will change from download to Run You will also see on the PC the following output from DSPterm Request send DSP image OOnnnn bytes to AF908 DSP Image transfer complete Run This function loads the DSP with a program from the SEEPROM and starts it running When you select this function you will get a menu listing the names of the DSP programs that
44. tire file on NN bytes DSP Image File Transfer Protocol The actual transfer of the image file to the Micro908 utilizes a protocol established for general purpose transfers between the PC and the SEEPROM on the Micro908 platform Only the subset of function specifically needed for transferring DSP image files is discussed here The complete protocol is documented in the source code and in the Micro908 SEEPROM Programmers Guide which is available on request for serious developers The transfer is initiated by the AF908 software running on the Micro908 in response to the user s request to download AF908 sends the 5 characters zZa The PC side responds with a 16 bit binary byte count for the image to be transferred MSB first AF908 responds with the 2 characters go at which point the PC side sends the image data Upon completion of the transfer AF908 send ok as an acknowledgement Transmit Delays During the data transfer part of the protocol there is a transmit delay of 10ms for every 128 bytes sent by the PC At least some delay is needed I have not experimented with the values but have tested this value over a range of machines speeds AF 908 DSP Audio Filter User Guide v1 0 The Protocol PC side AF908 on the Micro908 Request Text characters zZa request nn byte count Binary MSB Ist 0000 64K nn bytes DSP Programs xxx exe Format The format of the DSP programs the exe fil
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