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1. Application support has a new name DAvE The Digital Application Engineer from Siemens M icrocontrollers by loannis Kabitoglou loannis Kabitoglou is Product Manager for DAVE with the Siemens Semiconductor Group in Munich Page 36 A Are you an embedded systems programmer Is it your job to design the most appropriate microcontroller into a complex embedded control application in the shortest possible time and the best possible quality If so be honest haven t you often wished you would n t have to gather information from several different sources and many different docu ments in order to make an informed deci sion on which device is most suitable for you Haven t you often wished you wouldn t have to flip through hundreds of pages of text to teach yourself everything you need to know about the selected microcontroller and how to use it Haven t you wished you wouldn t have to get to know every bit in every regis ter in person in order to write the code that will drive the device s peripherals according to your requirements Haven t you wished you wouldn t have to spend so much time debugging just when you thought that every thing was at last over and done with In other words haven t you often wished that semiconductor manufacturers would find new innovative ways to support you in apply ing their products without you having to spend precious money trying to get this sup port elsewhere Well some2. Soff DERE CHEE CEH 4 Sn Sem egie Tome eee THA p biii T Fati O BIE Le niam Lid Wii Ge iriri mp iimm meant eed in dinah lei didi init TEINT oe neeer papirer s D is reese wick wee qm 1i MAENE CLE Fr l iir mmer addr m ihis Be Cede Tem Code nnim Qo ciis pores both and just go Page 38 A Figure 3 Easy configuration of the chip and automatic code generation
3. different external oscilla tor frequency DAvE will automatically calcu late and display the timing characteristics of all peripherals thus giving you an overview of how this basic setting affects the whole device Automatic calculations like these are another major feature of the configuration wizards which you will surely find very help ful throughout the configuration process Having specified the basic settings of your project you can now start configuring each module after another according to your application s requirements Let s assume that you need to use a timer to trigger the transmission of a byte over the asynchronous serial interface and that you ve decided to use timer 2 located in the GPT1 peripheral General Purpose Timer Unit 1 for this pur pose After calling the appropriate configura tion wizard you get a tab dedicated to timer 2 in which you set the Timer operating mode enable external control of the count direction set the timer input to Fcpu 64 and enable the related interrupt By enabling external control of the count direction you are actually setting bit T2UDE in register T2CON and at the same time occupying pin 15 in port 5 You can get this information by clicking on the right mouse button while over the External Up Down Enable group p gt Page 37 Tools and you can actually call the Register Viewer and watch bit T2UDE being set or you can just leave all these details to DAVE and move o
4. n above mentioned documents the dedicated documentation button will give you access to a search engine for the available applica tion notes as well as to general information concerning development tools and contacts Having all this concentrated knowledge at you fingertips directly in your development environment makes evaluating Siemens microcontrollers easy Even more it makes DAVE an invaluable aid and an important ref erence source through the whole develop ment process Configuring the on chip peripherals To go on with our example let s assume that after having selected and evaluated both the C167S and the C167CR you have chosen to use the later in your project Here comes the best part DAvE will now actually help you configure the chip s modules for your appli cation and will automatically generate an application specific set of customizable C functions that will initialize the chip and enable your application s code to control the peripherals functionality The first step in doing this is to create a new project with the C167CR DAvE will ask you to specify a pro ject directory in which the C source and header files are to be generated as well as a project name which is the name of the file in which DAvE will save the project specific configuration of the microcontroller Having done this DAVE will again reveal the chip s architecture to you only this time the con text sensitive menu for each
5. of us must have wished for all of the above and since wishes sometimes do come true let me introduce you to DAvE the Digital Application Engineer from Siemens Microcontrollers DAVE is a unique CD ROM based application support tool engineered to aid embedded systems developers in design ing applications with Siemens range of 8 and 16 bit microcontrollers DAvE will help you select the device most suitable for your applicationfs requirements _ provide you with object ori ented context sensitive access to all standard infor mation and documentation on this device guide you step by step through the con figuration of each of its on chip modules and automatically generate the appropriate device drivers i e fully tested documented and customizable C code for your applica tion and all this at the click of a button directly within your development environ ment Tools Selecting an appropriate microcontroller Let s assume for example that you are work ing on an embedded system for which you require a 16 bit microcontroller with at least 32 KB on chip ROM 2 KB on chip RAM five timers counters ten capture compare chan nels four PWM channels one USART unit and four A D converter channels The first thing to do is start the DAvE Application on your PC and go to the Products menu in which you will find all standard Siemens microcontroller derivatives listed according to the family they belong t
6. d applica tion engineer if he wasn t able to answer the questions that might occur in your mind while configuring the chip e g Why is this setting disabled or Which bit field am affecting with my action So for each group of settings within a configuration wiz ard DAVE offers a context sensitive menu it pops up when you click on the right mouse button with links to explanatory informa tion the position within the user s manual where the specific functionality is explained as well as the registers affected by your set tings The links to the registers take you to the Register Viewer which is a tool you can use to view the actual values of the bits of a selected register And since the displayed values are changed dynamically as you make your settings within the configuration wiz ard you can always see the relation between the functional level on which you re work ing and the bit level on which DAVE s work ing Now before you can start configuring the peripherals for your application DAvE will ask you to specify the very basic settings for your project as a whole by automatically calling the Project Settings configuration wizard In this wizard you set the exact type of the microcontroller and the C compiler you want use as well as the clock and the startup configuration of your system Note that when you change the value of the CPU clock either by selecting a different clock mode or entering a
7. e the documentation file docu rtf which contains a tailored documentation of the project the generated files the initialization of the peripherals and the API Application programming interface of the generated functions e the C source file and the C header file for the GPT1 peripheral gtl c gtl h which contain the code for the functions macros you had asked DAVE to generate for you e the main c file which contains the main initialization function and a template for your application s main function e the main h file with all the general defini tions and inclusions e the startup file start asm which contains the appropriately modified assembler start routine for your project e and finally a simple batch file make bat which you can use to compile and link your project using the tools in your development environment By double clicking on these files DAVE will display their content and you will see that although you haven t written a single line of code yet you already have a basic framework for your application with the Siemens C167CR microcontroller as well as a set of professionally written fully commented and tested functions you can use to control the GPT1 peripheral The next thing you would have to do now would be to configure the rest of the modules in the intuitive manner described above have DAVE compile your configuration wishes to C code and add your own user code in the designated a
8. n with your configuration One thing worth mentioning here is that if you were to Save amp Close the GPT 1 wizard and call the config uration wizard for Port 5 you wouldn t be able to set pin 15 to function as general input any more since you ve already dedicated it to timer 2 And if you should ask yourself why this is the case a right mouse click would suffice to answer your question The next steps in the configuration of timer 2 would be to set the level and the group of the related interrupt which is a simple drag amp drop affair and finally select the C func tions that DAVE should generate for you by moving forward to the Functions tab The functions you would need for your applica tion would be the initialization function GT1_vinit without it the peripheral won t be used in your application the functions GT1_vStartTmr GT1l_vStopTmr and GT1_vLoadTmr as well the interrupt service routine GT1_vilsrTmr2 which DAvE has automatically selected for you since you had enabled the timer 2 interrupt in a previous tab After making your selection you can change the function names and the names of the source file and header file in which the functions will be ahead and generate code by clicking on the magic button After the code generation process has been completed you can use the File Viewer tool to explore the files DAvE generated in the specified project directory In our example these files would be
9. o In order to select a microcontroller for evaluation you can either consult the Family Overview doc ument and make your selection directly or you can use the Smart Search feature Smart Search allows you to specify the features you are looking for in a device as well as their rel ative importance and then tells you which devices meet your needs and to what extent In our example the two microcontrollers most appropriate for your application would be the C167CR and the C167S After selecting a microcontroller DAVE will take you into the chip and reveal the mod ules which comprise its architecture To access the documentation and information on the selected device you have two possibil ities you can either click on the dedicated button located on the top left which will give you point amp click access to the functional highlights of the device its product informa tion sheet its user s manual the respective data sheets as well as the instruction set Figure 1 DAVE manual or you can browse with your mouse to any of the on chip modules and click on the right mouse button which pops up a con text sensitive menu with links to the func tional highlights of the module and the spe cific position within the user s manual where the module is described In addition to the boc Dust Hes PORE ala ema Be ner e e ar F hie bs p j p bee al E me ajaj late li ail Pel l ad a EAL AUDA PNP Aaa a
10. of the peripher als will include an additional menu item Figure 2 Intuitive access to information and documentation labeled Configure which calls the configura tion wizard of the module Configuration wizards are the most impor tant tools when working on a project They look similar to the wizards that help us install a modem or a printer only they are more complex due to the complexity of the mater at hand and much more intelligent They consist of a module specific sequen tially ordered set of tabs each handling a dif ferent aspect of the module s configuration The tabs contain several groups of settings which allow you to specify how you want to use the module in your application The nice thing about the wizards is that you talk to them in your application s language No matter which bits in which register set Timer 2 to count up every time a positive transition on a specific pin occurs you just have to ask for it and DAVE will handle all the details No matter what the reload value for some baudrate generator register must be in order to operate the USART at 9600 baud you just have to wish for it and DAvE will handle the rest And as if that s not enough while you are configuring DAvE will auto matically check the effect your settings may have on other settings and dynamically make adjustments to the wizards to prevent you from making an erroneous configuration Of course DAVE wouldn t be a goo
11. reas in order to integrate your application level soft ware with the hardware Having done this DAvE will have saved you from a lot of time consuming and error prone work and will have helped you understand the chip and how to program it You are probably asking yourself now And how much would have to pay for all this Well we don t feel that application support for our customers is an option for us It is an obligation So to all those working or inter ested in working with Siemens microcon trollers DAVE is available for free go to www smi siemens com DAVE html generated and you also have the possi bility to enter some notes regarding the module s configu ration Dorman Gre J ed ee el Dew OP Generating code eed aa aad By pressing the Save amp Close but ton you conclude the configuration of the GPTl peripheral and can either move on to another module directly or first generate an overview of your project in which DAvE will tell you exactly how each module used in your application is configured In our case we will skip Tmiem in a aii Piai Aint Tur we E Denier ire Dom ee igp Yom rgia FH Parei Paean Hess T e TY Tee Diiis T Leen iTA W T biie T Dassie F Tm F irin E ait Liis Dice Graia 1 UAE i ase dirs Tt TR Miria hu Seabee TAi i i kki Fr E Peri 0 EE g aay ara PIL FIJATE Lae Eee ii Vi EREE CHN PSG INCL tented
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