File content as of revision 3:9c3f2662974e:

#include "RoboClaw.h"
#include <stdarg.h>

#define MAXTRY 1
#define SetDWORDval(arg) (uint8_t)(arg>>24),(uint8_t)(arg>>16),(uint8_t)(arg>>8),(uint8_t)arg
#define SetWORDval(arg) (uint8_t)(arg>>8),(uint8_t)arg

RoboClaw::RoboClaw(int baudrate, PinName rx, PinName tx) : _roboclaw(rx, tx){
    _roboclaw.baud(baudrate);
}

void RoboClaw::crc_clear(){
    crc = 0;
}

void RoboClaw::crc_update (uint8_t data){
    int i;
    crc = crc ^ ((uint16_t)data << 8);
    for (i=0; i<8; i++) {
        if (crc & 0x8000)
            crc = (crc << 1) ^ 0x1021;
        else
            crc <<= 1;
    }
}

uint16_t RoboClaw::crc_get(){
    return crc;
}

void RoboClaw::write_n(uint8_t cnt, ... ){
    //uint8_t retry = MAXTRY;
    //do {
        crc_clear();
        va_list marker;
        va_start( marker, cnt );
        for(uint8_t index=0; index<cnt; index++) {
            uint8_t data = va_arg(marker, unsigned int);
            crc_update(data);
            _roboclaw.putc(data);
        }
        va_end( marker );
        uint16_t crc = crc_get();
        _roboclaw.putc(crc>>8);
        _roboclaw.putc(crc);
    //} while(_roboclaw.getc() != 0xFF);
}

void RoboClaw::write_(uint8_t address, uint8_t command, uint8_t data, bool reading, bool crcon){
    _roboclaw.putc(address);
    _roboclaw.putc(command);

    if(reading == false) {
        if(crcon == true) {
            uint8_t packet[2] = {address, command};
            uint16_t checksum = crc16(packet,2);
            _roboclaw.putc(checksum>>8);
            _roboclaw.putc(checksum);
        } else {
            uint8_t packet[3] = {address, command, data};
            uint16_t checksum = crc16(packet,3);
            _roboclaw.putc(data);
            _roboclaw.putc(checksum>>8);
            _roboclaw.putc(checksum);
        }
    }
}

uint16_t RoboClaw::crc16(uint8_t *packet, int nBytes){
    uint16_t crc_;
    for (int byte = 0; byte < nBytes; byte++) {
        crc_ = crc_ ^ ((uint16_t)packet[byte] << 8);
        for (uint8_t bit = 0; bit < 8; bit++) {
            if (crc_ & 0x8000) {
                crc_ = (crc_ << 1) ^ 0x1021;
            } else {
                crc_ = crc_ << 1;
            }
        }
    }
    return crc_;
}

uint8_t RoboClaw::read_(void){
    return(_roboclaw.getc());
}

void RoboClaw::ForwardM1(uint8_t address, int speed){
    write_(address,M1FORWARD,speed,false,false);
}

void RoboClaw::BackwardM1(uint8_t address, int speed){
    write_(address,M1BACKWARD,speed,false,false);
}

void RoboClaw::ForwardM2(uint8_t address, int speed){
    write_(address,M2FORWARD,speed,false,false);
}

void RoboClaw::BackwardM2(uint8_t address, int speed){
    write_(address,M2BACKWARD,speed,false,false);
}

void RoboClaw::Forward(uint8_t address, int speed){
    write_(address,MIXEDFORWARD,speed,false,false);
}

void RoboClaw::Backward(uint8_t address, int speed){
    write_(address,MIXEDBACKWARD,speed,false,false);
}

void RoboClaw::ReadFirm(uint8_t address){
    write_(address,GETVERSION,0x00,true,false);
}

int32_t RoboClaw::ReadEncM1(uint8_t address){
    int32_t enc1;
    uint16_t read_byte[7];
    write_n(2,address,GETM1ENC);

    read_byte[0] = (uint16_t)_roboclaw.getc();
    read_byte[1] = (uint16_t)_roboclaw.getc();
    read_byte[2] = (uint16_t)_roboclaw.getc();
    read_byte[3] = (uint16_t)_roboclaw.getc();
    read_byte[4] = (uint16_t)_roboclaw.getc();
    read_byte[5] = (uint16_t)_roboclaw.getc();
    read_byte[6] = (uint16_t)_roboclaw.getc();

    enc1 = read_byte[1]<<24;
    enc1 |= read_byte[2]<<16;
    enc1 |= read_byte[3]<<8;
    enc1 |= read_byte[4];

    return enc1;
}

int32_t RoboClaw::ReadEncM2(uint8_t address){
    int32_t enc2;
    uint16_t read_byte2[7];
    write_(address,GETM2ENC,0x00, true,false);

    read_byte2[0] = (uint16_t)_roboclaw.getc();
    read_byte2[1] = (uint16_t)_roboclaw.getc();
    read_byte2[2] = (uint16_t)_roboclaw.getc();
    read_byte2[3] = (uint16_t)_roboclaw.getc();
    read_byte2[4] = (uint16_t)_roboclaw.getc();
    read_byte2[5] = (uint16_t)_roboclaw.getc();
    read_byte2[6] = (uint16_t)_roboclaw.getc();

    enc2 = read_byte2[1]<<24;
    enc2 |= read_byte2[2]<<16;
    enc2 |= read_byte2[3]<<8;
    enc2 |= read_byte2[4];

    return enc2;
}

int32_t RoboClaw::ReadSpeedM1(uint8_t address){
    int32_t speed1;
    uint16_t read_byte[7];
    write_n(2,address,GETM1SPEED);

    read_byte[0] = (uint16_t)_roboclaw.getc();
    read_byte[1] = (uint16_t)_roboclaw.getc();
    read_byte[2] = (uint16_t)_roboclaw.getc();
    read_byte[3] = (uint16_t)_roboclaw.getc();
    read_byte[4] = (uint16_t)_roboclaw.getc();
    read_byte[5] = (uint16_t)_roboclaw.getc();
    read_byte[6] = (uint16_t)_roboclaw.getc();

    speed1 = read_byte[1]<<24;
    speed1 |= read_byte[2]<<16;
    speed1 |= read_byte[3]<<8;
    speed1 |= read_byte[4];

    return speed1;
}

int32_t RoboClaw::ReadSpeedM2(uint8_t address){
    int32_t speed2;
    uint16_t read_byte2[7];
    write_n(2,address,GETM2SPEED);

    read_byte2[0] = (uint16_t)_roboclaw.getc();
    read_byte2[1] = (uint16_t)_roboclaw.getc();
    read_byte2[2] = (uint16_t)_roboclaw.getc();
    read_byte2[3] = (uint16_t)_roboclaw.getc();
    read_byte2[4] = (uint16_t)_roboclaw.getc();
    read_byte2[5] = (uint16_t)_roboclaw.getc();
    read_byte2[6] = (uint16_t)_roboclaw.getc();

    speed2 = read_byte2[1]<<24;
    speed2 |= read_byte2[2]<<16;
    speed2 |= read_byte2[3]<<8;
    speed2 |= read_byte2[4];

    return speed2;
}

void RoboClaw::ResetEnc(uint8_t address){
    write_n(2,address,RESETENC);
}

void RoboClaw::SpeedM1(uint8_t address, int32_t speed){
    write_n(6,address,M1SPEED,SetDWORDval(speed));
}

void RoboClaw::SpeedM2(uint8_t address, int32_t speed){
    write_n(6,address,M2SPEED,SetDWORDval(speed));
}

void RoboClaw::SpeedAccelM1(uint8_t address, int32_t accel, int32_t speed){
    write_n(10,address,M1SPEEDACCEL,SetDWORDval(accel),SetDWORDval(speed));
}

void RoboClaw::SpeedAccelM2(uint8_t address, int32_t accel, int32_t speed){
    write_n(10,address,M2SPEEDACCEL,SetDWORDval(accel),SetDWORDval(speed));
}

void RoboClaw::SpeedAccelM1M2(uint8_t address, int32_t accel1, int32_t speed1, int32_t accel2, int32_t speed2){
    write_n(10,address,M2SPEEDACCEL,SetDWORDval(accel1),SetDWORDval(speed1),SetDWORDval(accel2),SetDWORDval(speed2));
}

void RoboClaw::SpeedDistanceM1(uint8_t address, int32_t speed, uint32_t distance, uint8_t buffer){
    write_n(11,address,M1SPEEDDIST,SetDWORDval(speed),SetDWORDval(distance),buffer);
}

void RoboClaw::SpeedDistanceM2(uint8_t address, int32_t speed, uint32_t distance, uint8_t buffer){
    write_n(11,address,M2SPEEDDIST,SetDWORDval(speed),SetDWORDval(distance),buffer);
}

void RoboClaw::SpeedAccelDistanceM1(uint8_t address, int32_t accel, int32_t speed, uint32_t distance, uint8_t buffer){
    write_n(15,address,M1SPEEDACCELDIST,SetDWORDval(accel),SetDWORDval(speed),SetDWORDval(distance),buffer);
}

void RoboClaw::SpeedAccelDistanceM2(uint8_t address, int32_t accel, int32_t speed, uint32_t distance, uint8_t buffer){
    write_n(15,address,M2SPEEDACCELDIST,SetDWORDval(accel),SetDWORDval(speed),SetDWORDval(distance),buffer);
}

void RoboClaw::SpeedAccelDeccelPositionM1(uint8_t address, uint32_t accel, int32_t speed, uint32_t deccel, int32_t position, uint8_t flag){
    write_n(19,address,M1SPEEDACCELDECCELPOS,SetDWORDval(accel),SetDWORDval(speed),SetDWORDval(deccel),SetDWORDval(position),flag);
}

void RoboClaw::SpeedAccelDeccelPositionM2(uint8_t address, uint32_t accel, int32_t speed, uint32_t deccel, int32_t position, uint8_t flag){
    write_n(19,address,M2SPEEDACCELDECCELPOS,SetDWORDval(accel),SetDWORDval(speed),SetDWORDval(deccel),SetDWORDval(position),flag);
}

void RoboClaw::SpeedAccelDeccelPositionM1M2(uint8_t address,uint32_t accel1,uint32_t speed1,uint32_t deccel1, int32_t position1,uint32_t accel2,uint32_t speed2,uint32_t deccel2, int32_t position2,uint8_t flag){
    write_n(35,address,MIXEDSPEEDACCELDECCELPOS,SetDWORDval(accel1),SetDWORDval(speed1),SetDWORDval(deccel1),SetDWORDval(position1),SetDWORDval(accel2),SetDWORDval(speed2),SetDWORDval(deccel2),SetDWORDval(position2),flag);
}