File content as of revision 0:2d6ffd5a4d2e:

#include "mbed.h"
#include "LTC6803.h"

DigitalOut myled(P2_17);
SPI spi(P0_9, P0_8, P1_29); // mosi, miso, sclk
DigitalOut cs(P0_2);

Serial pc(P0_19, P0_18);

unsigned char CalcCRCLTC6803(unsigned char * dat, unsigned char numdat);

static unsigned char crc8_table[256];      // 8-bit table for PEC calc
static int made_table = 0;         // table made flag
unsigned char packet[18]={0};               // used for PEC calc
unsigned char PECbyte;                                                   // PEC of a byte
unsigned char PECpacket;                // PEC of packet
unsigned char PECpacketREAD;             // value that PECpacket should be as read from 6803

static void init_crc8();
void setPECbyte(unsigned char m);
void setPECpacket(unsigned char np);

static void init_crc8() {
   int z,j;
   unsigned char cr;
   if (!made_table) {
      for (z = 0; z < 256; z ++) {
         cr = z;
         for (j = 0; j < 8; j ++) {
            cr = (cr << 1) ^ ((cr & 0x80) ? 0x07 : 0);
         }
         crc8_table[z] = cr & 0xFF;
      }
      made_table = 1;
   }
}

void setPECbyte(unsigned char m) {
   PECbyte = 0x41;                   // initialize PECbyte
   if (!made_table) {
      init_crc8();
   }
   PECbyte = crc8_table[(PECbyte) ^ m];
}

void setPECpacket(unsigned char np) {            // np is number of bytes currently in packet[]
   int z;
   PECpacket = 0x41;                  // initialize PECpacket
   if (!made_table) {
      init_crc8();
   }
   for (z = 0; z < np; z ++) {
      PECpacket = crc8_table[(PECpacket) ^ packet[z]];
   }
}
unsigned char CalcCRCLTC6803(unsigned char * dat, unsigned char numdat){
    unsigned char pec;
    char loop, outerloop;
    datainput in;
    in.byte = 0;
    pec = CRCDEFAULT;
    for(outerloop = 0; outerloop < numdat; outerloop++){
        for(loop = 8; loop > 0; loop--){
            in.in.b0 = (dat[outerloop] >> (loop - 1)) ^ ((pec >> 7));
            in.in.b1 = in.in.b0 ^ (pec);
            in.in.b2 = in.in.b0 ^ (pec >> 1);
            pec = pec << 1;
            pec = (pec & 0xF8) | (in.byte & 0x07);
        }
    }
    return pec;
}



int main() {
    unsigned char cmd, tmp, datnum;
    unsigned char dat[16], getdat[16];
    char str[32];
    cs = 1;
    spi.format(8,3);
    spi.frequency(50000);
    pc.baud(460800);
    cmd = WRCFG;
    spi.write(cmd);
    spi.write(CalcCRCLTC6803(&cmd, 1));
    dat[0] = 0x02;
    dat[1] = 0x00;
    dat[2] = 0xf0;
    dat[3] = 0xff;
    dat[4] = 0x00;
    dat[5] = 0x00;
    for(int loop = 0;loop < 6; loop++){
        spi.write(dat[loop])
    }
    cmd = CalcCRCLTC6803(dat, 6);
    spi.write(cmd);
    while(1) {
        pc.printf("cmd in\n");
        pc.scanf("%x", &cmd);
        cs = 0;
        pc.printf("dat num\n");
        pc.scanf("%d", &datnum);
        for(tmp = 0;tmp < datnum; tmp++){
            pc.printf("dat num[%d]\n", (tmp));
            pc.scanf("%s", str);
            dat[tmp] = strtol(str, NULL, 16);
        }
        spi.write(cmd);
//        pc.printf("%X\n", cmd);
        cmd = CalcCRCLTC6803(&cmd, 1);
        spi.write(cmd);
//        pc.printf("%X\n", cmd);
        for(tmp = 0; tmp < datnum; tmp++){
            getdat[tmp] = spi.write(dat[tmp]);
//            pc.printf("dat[%X] = %X\n", tmp, dat[tmp]);
        }
        cmd = CalcCRCLTC6803(dat, datnum);
        spi.write(cmd);
        cs = 1;
        for(tmp = 0; tmp < datnum; tmp++){
            pc.printf("get[%d] = %x\n", tmp, getdat[tmp]);
        }
        myled = !myled;
    }
}