Embedded System Design Course Description
Contents
1. Consider how your measured times compare to calculated times and how you might further reduce EEPROM write cycle time impact in an embedded system design 19 Demonstrate your hardware software and get your lab signoff sheet signed by the TA 2005 2009 Linden H McClure Ph D 6 Embedded System Design ECEN 4613 5613 Embedded System Design Fall 2009 Lab 4 Signoff Sheet You will need to obtain the signature of your instructor or TA on the following items in order to receive credit for your lab assignment This assignment is due by Tuesday November 17 2009 Labs completed after the due date will receive grade reductions Print your name below sign the honor code pledge and then demonstrate your working hardware amp firmware in order to obtain the necessary signatures All items must be completed to get a signature but partial credit is given for incomplete labs Student Name 4613 or 5613 circle one Signoff Checklist Required Elements Pins and signals labeled and decoupling capacitors present on board LCD functional C code for basic LCD routines functional LCD control signal timing meets specifications diagram Serial EEPROM functional contents present after power cycle C code for EEPROM functional I C timing correct LCD Display and hex dump of EEPROM Oococvoo so TA Instructor signature and date Supplemental Elements Qualifies student for higher grade Q Elapsed time d2. Assessment Adjustments Late Penalty Final Grade Comments Outstanding
3. Design 17 Supplemental Element Modify your previous C program to do the following additional things e Inthe bottom right corner of the LCD continuously display the elapsed time since your program started running using the format MM SS where MM is the number of elapsed minutes and SS is the number of elapsed seconds For example 5 seconds would be displayed as 00 05 and 64 seconds would be displayed as 01 04 e Provide additional Clock menu options to stop the elapsed time clock to restart the clock to reset the clock back to 00 00 and to change the direction of counting up down If the clock is counting down NOTE Make sure that the cursor location is correctly stored before and restored after any ISRs NOTE If using MICRO C remember not to use any local variables from within the context of an ISR This includes any functions that your ISR calls e Design and implement C routines which allow the creation of custom LCD characters using CGRAM Implement the following function Name lcdcreatechar Description Function to create a 5x8 pixel custom character with character code ccode 0 lt ccode lt 7 using the row values given in the 8 byte array row_vals void lcdcreatechar unsigned char ccode unsigned char row_vals Provide a way for the user to enter and display their own customer characters e Inthe same program continuously animate a spinner arrow symbol on the LCD using four
4. characters t lt By sequentially displaying each of these characters in the same position on the screen you can make these look like a spinning arrow You will have to create some of the characters since they are not all built into the LCD You may want to use a timer interrupt or a delay function to control the spin rate NOTE This supplemental element is an addition to the previous required element The required The elapsed timer must work correctly while simultaneously allowing all the menu options in the previous C program to work correctly 2005 2009 Linden H McClure Ph D 5 Embedded System Design 18 Supplemental Element e Read the PCF8574 I C I O expander data sheets and application notes available from the course web site Integrate the chip into your embedded system and prove that you can configure some of its I O pins to work as inputs and other pins to work simultaneously as outputs Your parts kit already included a 16 pin wire wrap socket that could be used with the I2C expander chip You can purchase another wire wrap socket if necessary Provide a user interface that allows you to configure the pins individually as inputs or outputs and also to check the status of the pins and to write to the pins that are outputs Nice enhancements would be to use the interrupt signal from the I O expander to notify the processor of an event or to have at least one of the I O pins drive an LED direct
5. since you are connecting to the EEPROM using port pins the EEPROM does not consume any 8051 address space NOTE In the next step your EEPROM driver code may require use of specific port pins 12 Required Element Implement an EEPROM I C device driver with the ability to write and read a byte at any EEPROM I C address using function calls from C The underlying drivers may be in assembly if you wish but the functions must be accessible from C It does not matter what you name the functions For example you might implement the following two functions int int eebytew addr data write byte returns status eebyter addr read byte returns data or status a You may use these libraries as long as your code contains clear documentation of how you obtained utilized and or modified them You already know this is the standing expectation in this class with regard to borrowed code 13 Required Element Verify that you can write data to and read data from the EEPROM using your PC device driver and verify the stored data is correct after cycling power 14 Required Element Use a logic analyzer to prove that your byte write function sends the correct signals and has the correct I C timing 15 Optional Use the IC triggering program on the Agilent 54622D oscilloscope to trigger on a write or read frame on the bus Display SCL and SDA on the oscilloscope screen and verify that the transaction is for
6. the address you intended Verify that your rise and fall times fall within the limits given in the I C specification Alternatively use a logic analyzer to trigger on a bus transaction 2005 2009 Linden H McClure Ph D 3 Embedded System Design 16 Required Element Provide a well designed menu on the PC terminal emulator screen which allows the user to e Write Byte Enter an EEPROM address and a byte data value in hex If the address and data are valid store the data into the EEPROM The program must allow any hex value from 0x00 to OxFF to be programmed into any location in the EEPROM Do not make the user type in 0x before the address or data hex value e Read Byte Enter an EEPROM address in hex If the EEPROM address is valid display on the PC screen in hex the contents of the EEPROM address using the format AAAA DD Do not make the user type in 0x before the address hex value e LCD Display Enter an EEPROM address in hex If the EEPROM address is valid display on the LCD display in hex the EEPROM address and the contents of the EEPROM address using the format AAAA DD positioned on the LCD at row column Y 0 Y is the row number and cycles through the values 0 1 2 3 0 1 2 3 0 Each time this function is called the EEPROM cell content is printed and then Y is incremented according to the sequence shown above Data from up to four EEPROM addresses can be seen on the LCD screen at any one time dep
7. ECEN 4613 5613 Embedded System Design Week 9 Fall 2009 Lab 4 10 21 2009 Lab Overview In this lab assignment you will do the following Add an LCD and a serial EEPROM to the hardware developed in Labs 1 2 amp 3 Write device drivers for the LCD and EEPROM Use C pointers to access a peripheral Write assembly and C programs to implement a user interface and perform user tasks Write simple assembly and C programs to test EEPROM accesses Continue learning how to use SDCC and Eclipse The signature due date for this lab assignment is Tuesday November 17 2009 The submission due date for this lab is 5 30pm Wednesday November 18 2009 This lab is weighted as 20 of your course grade You should be working on your final project in parallel with this lab assignment NOTE The quality of your user interfaces and demo will impact your score on the lab Your goal should be to ensure that the user has a successful and positive experience with your software Your code should handle error conditions gracefully e g user input values outside the allowed range Top scores are reserved for those students who submit outstanding implementations including coding style Lab Details 1 Review the data sheets for the Optrex DMC 20434 LCD and the SED1278F or Hitachi HD44780U LCD controller Make sure to review the document SED1278F Technical Manual Errata 2 Refer to the LCD Guide Adding an LCD with an HD44780 LCD
8. controller to your board available on the course web site for further ideas and information on interfacing to the LCD module It contains some very important notes including one regarding errors in the LCD data sheet 3 Required Element Devise a way to securely mount the LCD and properly connect all of the data lines to your board Data Lines Most LCDs will have only 14 pins However those with a backlight will have 16 the extra two of which control the backlight One option for connecting data lines is to use a 14 pin strip header or SIPP wire wrap socket You may also attach the LCD through a ribbon cable to a 14 or 16 pin DIP socket on your board A sturdy data line connection using a strip header can make it easy to mount the LCD Mounting It may take you a little time to devise a good physical interface so don t wait too long before getting started Wire can be used to easily attach the LCD to your board without requiring any drilling remember the previous warnings against drilling holes in the PCB 4 Required Element Design and implement your LCD circuit Your LCD must be memory mapped in the address space reserved for peripherals and will be accessible using the MOVX instruction and via a pointer variable in C The LCD contrast Vez can sometimes be grounded but you probably need to use a potentiometer or resistor divider to control the contrast so that you can see characters on the screen The LCD in the parts kit
9. ed the work at an acceptable level Watch for instructions about probable electronic submission via CULearn In addition to the items listed on the signoff checklist be sure to review the lab for additional requirements for submission including Q Signed and dated signoff sheet as the top sheet No cover sheet please Q Submission Sheet with signed honor code pledge as the second sheet printed on the back of the signoff sheet is OK Q Full copy of complete and accurate schematic of acceptable quality all old new components shown Include programmable logic source code e g PLD file for the SPLD Submit via CULearn Q Fully neatly clearly commented source code Ensure your code is easy to read Submit via CULearn Q Timing diagrams for the LCD and EEPROM interfaces Make copies of your code SPLD code and schematic files and save them as an archive You will need to submit all the Lab files electronically at the end of the semester Student Name 4613 or 5613 circle one Honor Code Pledge On my honor as a University of Colorado student I have neither given nor received unauthorized assistance on this work Student Signature FOR INSTRUCTOR USE ONLY Not Poor Not Meets Exceeds Submission Evaluation Applicable Complete Requirements Requirements Required Elements Code Quality Style Comments O O O O Supplemental Elements Code Quality Style Comments O O O O Overall Submission Quality O O O o Overall
10. ending on how many times the user has selected LCD Display Do not make the user type in 0x before the address hex value This function must utilize the lcdgotoxy device driver function e Hex Dump Read the entire contents of the EEPROM and display the data on the PC screen in hexadecimal with 16 bytes of data per line in the following format AAAA DD DD DD DD DD DD DD DD DD DD DD DD DD DD DD DD This format is similar to what you see when using the EPROM programmer or when dumping memory contents using PAULMON2 where AAAA is the starting address in hex for each block of 16 data values DD in hex The first memory cell in the EEPROM is address 0000 You should be able to leverage code from Lab 3 Required elements are necessary in order to meet the requirements for the lab Supplemental elements of the lab assignment may be completed by the student to qualify for a higher grade but they do not have to be completed to successfully meet the requirements for the lab The highest possible grade an ECEN 5613 student can earn on this assignment without completing any of the supplemental elements is a C The highest possible grade an ECEN 4613 student can earn on this assignment without completing any of the supplemental elements is a B ECEN 4613 students may qualify for full credit for this lab assignment by completing the required elements and the first supplemental element 2005 2009 Linden H McClure Ph D 4 Embedded System
11. has 14 pins lines which must be connected 2005 2009 Linden H McClure Ph D l Embedded System Design 5 Required Element Implement an LCD device driver with the following C functions Name lcdinit Description Initializes the LCD see Figure 25 on page 212 of the HD44780U data sheet void lcdinit Name lcdbusywait Description Polls the LCD busy flag Function does not return until the LCD controller is ready to accept another command void lcdbusywait Name lcdgotoaddr Description Sets the cursor to the specified LCD DDRAM address Should call lcdbusywait void lcdgotoaddr unsigned char addr Name lcdgotoxy Description Sets the cursor to the LCD DDRAM address corresponding to the specified row and column Location 0 0 is the top left corner of the LCD screen void lcdgotoxy unsigned char row unsigned char column Name lcdputch Description Writes the specified character to the current LCD cursor position Should call lcdbusywait void lcdputch char cc Name lcdputstr Description Writes the specified null terminated string to the LCD starting at the current LCD cursor position Automatically wraps long strings to the next LCD line after the right edge of the display screen has been reached void lcdputstr char ss 6 Required Element Write a simple program that uses your LCD driver to
12. isplay accurate 1 second resolution Elapsed time stop restart reset to 00 00 up down Support for custom LCD characters Spinner symbol Good integration with previous code all functions work with no irregularities Ooco Supplemental Elements Qualifies student for higher grade Q PCF8574 PC I O Expander Q EEPROM eereset functional and correct Q Measure EEPROM Write Times TA Instructor Comments e g user interface quality issues Not Poor Not Meets Exceeds FOR INSTRUCTOR USE ONLY Applicable Complete Requirements Requirements Outstanding Schematics SPLD code 0O O O O O Hardware physical implementation O Required Elements functionality O O O O O Supplemental Elements functionality O O O O O Sign off done without excessive retries O O O O O Student understanding and skills o o O O O Overall Demo Quality 0O 0O 0O O O Comments Submission Sheet Instructions Print your name below circle your course number and sign the honor code pledge Separate the signoff and submission sheets from the rest of the lab and turn in these two signed forms the items in the checklist below and the answers to any applicable lab questions to the instructor in order to receive credit for your work No cover sheet please Note that receiving a signature on the signoff sheet does not mean that your work is eligible for any particular grade it merely indicates that you have complet
13. ly e Modify your EEPROM I C device driver to include a new function named eereset Name eereset Description Performs a software reset of the I2C EEPROM using an algorithm that conforms to Microchip application note AN709 void eereset Show the trace on the logic analyzer to the TA during signoff You do not need to print submit the trace with your report e Provide an option for the user to Measure EEPROM Write Times Write a function that enables the user to measure with a logic analyzer or oscilloscope how long it takes to write data to the EEPROM in byte write and page write modes including software overhead One method is to use two GPIOs on the 8051 to help measure these times Toggle a GPIO just before issuing a byte write command including a STOP condition to force the EEPROM to commit the data Use ACK polling to determine when the device has finished the write and toggle the GPIO again Use a logic analyzer or scope to measure the time the byte write took Toggle a second GPIO just before sending a page write command send a page of 16 bytes to the EEPROM and then commit the data use ACK polling to determine the end of the write operation and then toggle the second GPIO again Compare both byte write and page write times to the data sheet write cycle timing specification and determine how long it would take to write 1024 bytes of data to the EEPROM using the byte write and page write methods
14. prove that the six required functions are implemented correctly Choose the sequence carefully so that it is easy for the TA to see that each function did its job correctly during the demonstration 7 Required Element Using a logic analyzer prove that your LCD control signal timing is correct Show the timing relationships between the E RS R W and data signals as measured at your LCD interface You should also be able to prove that the LCD E control signal goes high only when the LCD is being accessed You can verify this by running code which does not access the LCD and by triggering the logic analyzer on E going high If E goes high during this test then your implementation is incorrect You may also be able to test this by using Paulmon2 2005 2009 Linden H McClure Ph D 2 Embedded System Design 8 Read the EEPROM Guide Adding an NM24C04 or NM24C16 EEPROM to your board available on the course web site It has ideas and information on interfacing to the IC EEPROM 9 Read the data sheet for the serial EEPROM included in your parts kit e g Microchip 24LC16 or Fairchild National Semiconductor NM24C 16 You may also want to read Fairchild Application Note AN 794 10 Optional but recommended Review Microchip app notes AN536 AN572 AN614 and AN709 11 Required Element Design and implement your EEPROM circuit Your EEPROM should be connected to two unused port pins on Port 1 or Port 3 Note that
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