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PIC 16F887 use as main processor with Magellan GPS (Sportask MAP)

Posted by hawk on June 4, 2010 at 12:49pm
Hi ,We are helper 01 UAV research group. Our mission is to control only Rudder by using FMA Co-pilot. PIC 16F887 use as main processor to connect with Magellan GPS (SporTrak Map) for waypoints and true heading . But We’re facing some problems.(1) Is PiC 16F887 enough for UAV Rudder control?(2) How can select GPRMC sentence form Magellan GPS? Following program flow is right or not?#INT_RDAvoid gpsRda_isr(void){c = fgetc(GPS);c = (char)c;if(c=='$') commas=0;header=0;if(c=='R') header++;if(c=='M') header++;if(c=='C') header++;if(header==3){if(c==',') commas++;if(commas==3) // get latitude data (3) {if(c==',') k=0;else {LAT[k]=c; k++;}} if(commas==5) // get longtitude data (5){if(c==',') k=0;else {LONGI[k]=c; k++;}} if(commas==8) // true heading (8) {if(c==',') k=0;else {tr1[k]=c; k++;}}if(commas==9) flag=1;}fputc(c,modem);output_high(PIN_D2);}(3) Magellan Gps give us 6 lines with RMC sentences. And so I wanna to know about a program that write with PIC 16F887 and Magellan Gps.Please give us your suggestions .We always thanks for your help and kindness.Helper 01 UAV research groupAerospace Engineering UniversityChina

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Replies

  • Gerry Lichter June 6, 2010 at 2:04pm
    I'm afraid my impression is that you know more about coding/debugging than myself. Nothing comes to my mind.

    Out of curriosity: is there any reason you've selected these components vs. ardupilot/ublox or em406?

    I think people may have a better idea of how to help if they knew more about your project. Are you building an open source ardupilot/paparazzi style board? What other components are involved, ect.
  • hawk June 6, 2010 at 11:53am
    hi Gerry Lichter,

    thanks for ur help.Give me light ,Please
  • hawk June 5, 2010 at 11:08pm
    Dear Gerry lichter,

    Thanks for ur suggestons.We have to control only rudder with Magellan GPS (SporTrak Map).It is more empherize case for our UAV.Now our problem is .>>> Our program donot know all GPRMC sentence.A program know only G and P , after that program terminate.I thnik When program select GPRMC wiht 9600 baud(1Hz) , timer give a problem. Please give me suggestions , thanks.
    void gpsRda_isr(void)
    {
    c = fgetc(GPS);
    c = (char)c;
    if(c=='$') commas=0;
    header=0;
    if(c=='R') header++;
    if(c=='M') header++;
    if(c=='C') header++;
    if(header==3){
    if(c==',') commas++;
    if(commas==3) // get latitude data (3) {
    if(c==',') k=0;
    else {LAT[k]=c; k++;}
    } if(commas==5) // get longtitude data (5)
    {
    if(c==',') k=0;
    else {LONGI[k]=c; k++;}
    } if(commas==8) // true heading (8) {
    if(c==',') k=0;
    else {tr1[k]=c; k++;}
    }
    if(commas==9) flag=1;
    }fputc(c,modem);
    output_high(PIN_D2);
    }
  • Gerry Lichter June 5, 2010 at 11:16am
    Experimental: http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en026561
    Proven: http://www.atmel.com/dyn/products/product_card.asp?PN=ATmega328P

    You can make some predictions about performance issues you may face based on the specifications.

    Short Version:
    Atmel:
    -20 MIPS throughput at 20 MHz
    -8 Channel 10-bit A/D-converter(TQFP/MLF)
    -32KB self-programming Flash Program Memory,
    -2KB SRAM,
    -1024 Bytes EEPROM
    -Digital Communication Peripherals ?SPI/I2C?


    PIC:
    -14KB self-programming Flash Program Memory,
    -5 MIPS throughput at ?? MHz
    -14 channels of 10-bit A/D-converter
    -368 bytes RAM
    -256 Bytes EEPROM
    -Digital Communication Peripherals 1-A/E/USART, 1-MSSP(SPI/I2C)
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