TMC2240Stepper.cpp

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#include "../TMCStepper.h"
#include "TMC_MACROS.h"
 
int8_t TMC2240Stepper::chain_length = 0;
uint32_t TMC2240Stepper::spi_speed = 16000000/8;
 
TMC2240Stepper::TMC2240Stepper(uint16_t pinCS, int8_t link) :
    _pinCS(pinCS),
    link_index(link)
    {
        defaults();
 
        if (link > chain_length)
            chain_length = link;
    }
 
TMC2240Stepper::TMC2240Stepper(uint16_t pinCS, uint16_t pinMOSI, uint16_t pinMISO, uint16_t pinSCK, int8_t link) :
    _pinCS(pinCS),
    link_index(link)
    {
        SW_SPIClass *SW_SPI_Obj = new SW_SPIClass(pinMOSI, pinMISO, pinSCK);
        TMC_SW_SPI = SW_SPI_Obj;
        defaults();
 
        if (link > chain_length)
            chain_length = link;
    }
 
void TMC2240Stepper::defaults() {
    GCONF_register.multistep_filt = 1;
 
    IHOLD_IRUN_register.iholddelay = 1;
    TPOWERDOWN_register.sr = 20;
 
    // CHOPCONF_register.sr = 0x10010150;
    CHOPCONF_register.toff     = 0;
    CHOPCONF_register.hstrt    = 5;
    CHOPCONF_register.hend     = 2;
    CHOPCONF_register.fd3      = false;
    CHOPCONF_register.disfdcc  = false;
    CHOPCONF_register.chm      = false;
    CHOPCONF_register.TBL      = 0b10;
    CHOPCONF_register.vhighfs  = false;
    CHOPCONF_register.vhighchm = false;
    CHOPCONF_register.tpfd     = 0;         // leave 0 ?
    CHOPCONF_register.mres     = 0;
    CHOPCONF_register.intpol   = true;
    CHOPCONF_register.dedge    = false;
    CHOPCONF_register.diss2g   = false;
    CHOPCONF_register.diss2vs  = false;
 
    //PWMCONF_register.sr = 0xC40C001E;
    PWMCONF_register.pwm_ofs            = 30;
    PWMCONF_register.pwm_grad           = 0;
    PWMCONF_register.pwm_freq           = 0;
    PWMCONF_register.pwm_autoscale      = true;
    PWMCONF_register.pwm_autograd       = true;
    PWMCONF_register.freewheel          = 0;
    PWMCONF_register.pwm_meas_sd_enable = false;
    PWMCONF_register.pwm_dis_reg_stst   = false;
    PWMCONF_register.pwm_reg            = 4;
    PWMCONF_register.pwm_lim            = 12;
}
 
__attribute__((weak))
void TMC2240Stepper::setSPISpeed(uint32_t speed) {
    spi_speed = speed;
}
 
__attribute__((weak))
void TMC2240Stepper::switchCSpin(bool state) {
    digitalWrite(_pinCS, state);
}
 
__attribute__((weak))
void TMC2240Stepper::beginTransaction() {
    if (TMC_SW_SPI == nullptr) {
        SPI.beginTransaction(SPISettings(spi_speed, MSBFIRST, SPI_MODE3));
    }
}
__attribute__((weak))
void TMC2240Stepper::endTransaction() {
    if (TMC_SW_SPI == nullptr) {
        SPI.endTransaction();
    }
}
 
__attribute__((weak))
uint8_t TMC2240Stepper::transfer(const uint8_t data) {
    uint8_t out = 0;
    if (TMC_SW_SPI != nullptr) {
        out = TMC_SW_SPI->transfer(data);
    }
    else {
        out = SPI.transfer(data);
    }
    return out;
}
 
void TMC2240Stepper::transferEmptyBytes(const uint8_t n) {
    for (uint8_t i = 0; i < n; i++) {
        transfer(0x00);
    }
}
 
__attribute__((weak))
uint32_t TMC2240Stepper::read(uint8_t addressByte) {
    uint32_t out = 0UL;
    int8_t i = 1;
 
    beginTransaction();
    switchCSpin(LOW);
    transfer(addressByte);
    // Clear SPI
    transferEmptyBytes(4);
 
    // Shift the written data to the correct driver in chain
    // Default link_index = -1 and no shifting happens
    while(i < link_index) {
        transferEmptyBytes(5);
        i++;
    }
 
    switchCSpin(HIGH);
    switchCSpin(LOW);
 
    // Shift data from target link into the last one...
    while(i < chain_length) {
        transferEmptyBytes(5);
        i++;
    }
 
    // ...and once more to MCU
    status_response = transfer(addressByte); // Send the address byte again
    out  = transfer(0x00);
    out <<= 8; out |= transfer(0x00);
    out <<= 8; out |= transfer(0x00);
    out <<= 8; out |= transfer(0x00);
 
    endTransaction();
    switchCSpin(HIGH);
    return out;
}
 
__attribute__((weak))
void TMC2240Stepper::write(uint8_t addressByte, uint32_t config) {
    addressByte |= TMC_WRITE;
    int8_t i = 1;
 
    beginTransaction();
    switchCSpin(LOW);
    status_response = transfer(addressByte);
    transfer(config>>24);
    transfer(config>>16);
    transfer(config>>8);
    transfer(config);
 
    // Shift the written data to the correct driver in chain
    // Default link_index = -1 and no shifting happens
    while (i < link_index) {
        transferEmptyBytes(5);
        i++;
    }
 
    endTransaction();
    switchCSpin(HIGH);
}
 
void TMC2240Stepper::begin() {
    // set pins
    pinMode(_pinCS, OUTPUT);
    switchCSpin(HIGH);
 
    if (TMC_SW_SPI != nullptr) TMC_SW_SPI->init();
 
    GCONF(GCONF_register.sr);
    CHOPCONF(CHOPCONF_register.sr);
    PWMCONF(PWMCONF_register.sr);
    IHOLD_IRUN(IHOLD_IRUN_register.sr);
 
    //toff(8); //off_time(8);
    //tbl(1); //blank_time(24);
}
 
void TMC2240Stepper::push() {
    TPOWERDOWN(TPOWERDOWN_register.sr);
    TPWMTHRS(TPWMTHRS_register.sr);
    GCONF(GCONF_register.sr);
    SLAVECONF(NODECONF_register.sr);
    DRV_CONF(DRV_CONF_register.sr);
    IHOLD_IRUN(IHOLD_IRUN_register.sr);
    CHOPCONF(CHOPCONF_register.sr);
    PWMCONF(PWMCONF_register.sr);
 
    //GSTAT(GSTAT_register.sr);
    //TPOWERDOWN(TPOWERDOWN_register.sr);
 
    //IOIN(IOIN_register.sr);
 
    //DRV_STATUS(DRV_STATUS_register.sr);
    //GLOBAL_SCALER(GLOBAL_SCALER_register.sr);
 
    //TSTEP(TSTEP_register.sr);
 
    //TCOOLTHRS(TCOOLTHRS_register.sr);
    //THIGH(THIGH_register.sr);
 
    //COOLCONF(COOLCONF_register.sr);
 
    //PWM_SCALE(PWM_SCALE_register.sr);
    //PWM_AUTO(PWM_AUTO_register.sr);
    SG4_THRS(SG4_THRS_register.sr);
    //SG4_RESULT(SG4_RESULT_register.sr);
}
 
bool TMC2240Stepper::isEnabled() { return !drv_enn() && toff(); }
 
uint8_t TMC2240Stepper::IFCNT() {
    return read(IFCNT_t::address);
}
 
uint32_t TMC2240Stepper::PWM_SCALE() {
    return read(TMC2240_n::PWM_SCALE_t::address);
}
uint8_t TMC2240Stepper::pwm_scale_sum() {
    TMC2240_n::PWM_SCALE_t r{};
    r.sr = PWM_SCALE();
    return r.pwm_scale_sum;
}
 
int16_t TMC2240Stepper::pwm_scale_auto() {
    TMC2240_n::PWM_SCALE_t r{};
    r.sr = PWM_SCALE();
    return r.pwm_scale_auto;
    // Not two's complement? 9nth bit determines sign
    /*
    uint32_t d = PWM_SCALE();
    int16_t response = (d>>PWM_SCALE_AUTO_bp)&0xFF;
    if (((d&PWM_SCALE_AUTO_bm) >> 24) & 0x1) return -response;
    else return response;
    */
}
 
// R: PWM_AUTO
uint32_t TMC2240Stepper::PWM_AUTO() {
    return read(PWM_AUTO_t::address);
}
uint8_t TMC2240Stepper::pwm_ofs_auto()  { PWM_AUTO_t r{}; r.sr = PWM_AUTO(); return r.pwm_ofs_auto; }
uint8_t TMC2240Stepper::pwm_grad_auto() { PWM_AUTO_t r{}; r.sr = PWM_AUTO(); return r.pwm_grad_auto; }

//#define TMC2240_CURRENT_RANGE   2

//#define TMC2240_Rref            12000 // Standard
//#define TMC2240_Rref            12300 // FLY TMC2240
 
/*
  Requested current = mA = I_rms/1000
  Equation for current:
  I_rms = (CS+1)/32 * V_fs/R_sense * 1/sqrt(2)
  Solve for CS ->
  CS = 32*sqrt(2)*I_rms*R_sense/V_fs - 1
 
  Example:
  vsense = 0b0 -> V_fs = 0.310V //Typical
  mA = 1650mA = I_rms/1000 = 1.65A
  R_sense = 0.100 Ohm
  ->
  CS = 32*sqrt(2)*1.65*0.100/0.310 - 1 = 24,09
  CS = 24
*/
 
uint16_t TMC2240Stepper::cs2rms(uint8_t CS) {
    float IFS_current_RMS   = calc_IFS_current_RMS();
    const uint32_t gs = GLOBAL_SCALER(), globalscaler = gs ? gs : 256;
    return float(CS + 0.5f) * (globalscaler * IFS_current_RMS) / 256 / 32 * 1000;
}
 
float TMC2240Stepper::calc_IFS_current_RMS() {
    uint32_t Kifs_values[] = { 11750, 24000, 36000, 36000 };
    uint32_t Kifs = Kifs_values[DRV_CONF_register.current_range];
    return (float(Kifs) / Rref) / 1.414f;
}
 
uint32_t TMC2240Stepper::set_globalscaler(float current, float IFS_current_RMS) {
    uint32_t globalscaler = ((current * 256) / IFS_current_RMS) + 0.5f;
 
    if (globalscaler < 32) globalscaler = 32;
    if (globalscaler >= 256) globalscaler = 0;
    GLOBAL_SCALER(globalscaler);
    return globalscaler;
}
 
void TMC2240Stepper::rms_current(uint16_t mA) {
    float IFS_current_RMS   = calc_IFS_current_RMS();
    float mA_float = (float)mA / 1000;
    uint32_t globalscaler   = set_globalscaler(mA_float, IFS_current_RMS);
    if (globalscaler == 0) globalscaler = 256;
    int32_t CS = mA_float * 256.0f / globalscaler / IFS_current_RMS * 32 - 1 + 0.5f;
    if (CS > 31) CS = 31;
    if (CS < 0) CS = 0;
    irun(CS);
    ihold(CS * holdMultiplier);
}
 
void TMC2240Stepper::rms_current(uint16_t mA, float mult) {
    holdMultiplier = mult;
    rms_current(mA);
}
 
uint16_t TMC2240Stepper::rms_current() {
    return cs2rms(irun());
}
 
void TMC2240Stepper::microsteps(uint16_t ms) {
    switch(ms) {
        case 256: mres(0); break;
        case 128: mres(1); break;
        case  64: mres(2); break;
        case  32: mres(3); break;
        case  16: mres(4); break;
        case   8: mres(5); break;
        case   4: mres(6); break;
        case   2: mres(7); break;
        case   0: mres(8); break;
        default: break;
    }
}
 
uint16_t TMC2240Stepper::microsteps() {
    switch(mres()) {
        case 0: return 256;
        case 1: return 128;
        case 2: return  64;
        case 3: return  32;
        case 4: return  16;
        case 5: return   8;
        case 6: return   4;
        case 7: return   2;
        case 8: return   0;
    }
    return 0;
}
 
// R+C: GSTAT
uint8_t TMC2240Stepper::GSTAT()         { return read(TMC2240_n::GSTAT_t::address); }
void TMC2240Stepper::GSTAT(uint8_t)     { write(TMC2240_n::GSTAT_t::address, 0b111); }
bool TMC2240Stepper::reset()            { TMC2240_n::GSTAT_t r; r.sr = GSTAT(); return r.reset; }
bool TMC2240Stepper::drv_err()          { TMC2240_n::GSTAT_t r; r.sr = GSTAT(); return r.drv_err; }
bool TMC2240Stepper::uv_cp()            { TMC2240_n::GSTAT_t r; r.sr = GSTAT(); return r.uv_cp; }
bool TMC2240Stepper::register_reset()   { TMC2240_n::GSTAT_t r; r.sr = GSTAT(); return r.register_reset; }
bool TMC2240Stepper::vm_uvlo()          { TMC2240_n::GSTAT_t r; r.sr = GSTAT(); return r.vm_uvlo; }
 
uint8_t TMC2240Stepper::test_connection() {
    uint32_t drv_status = DRV_STATUS();
    switch (drv_status) {
        case 0xFFFFFFFF: return 1;
        case 0: return 2;
        default: return 0;
    }
}
 
// W: TPOWERDOWN
uint8_t TMC2240Stepper::TPOWERDOWN() { return TPOWERDOWN_register.sr; }
void TMC2240Stepper::TPOWERDOWN(uint8_t input) {
    TPOWERDOWN_register.sr = input;
    write(TPOWERDOWN_register.address, TPOWERDOWN_register.sr);
}
 
// W: TPWMTHRS
uint32_t TMC2240Stepper::TPWMTHRS() { return TPWMTHRS_register.sr; }
void TMC2240Stepper::TPWMTHRS(uint32_t input) {
  TPWMTHRS_register.sr = input;
  write(TPWMTHRS_register.address, TPWMTHRS_register.sr);
}
 
uint32_t TMC2240Stepper::TSTEP() { return read(TSTEP_t::address); }
 
void TMC2240Stepper::hysteresis_end(int8_t value) { hend(value+3); }
int8_t TMC2240Stepper::hysteresis_end() { return hend() - 3; };
 
void TMC2240Stepper::hysteresis_start(uint8_t value) { hstrt(value-1); }
uint8_t TMC2240Stepper::hysteresis_start() { return hstrt() + 1; }
 
// W: TCOOLTHRS
uint32_t TMC2240Stepper::TCOOLTHRS() { return TCOOLTHRS_register.sr; }
void TMC2240Stepper::TCOOLTHRS(uint32_t input) {
    TCOOLTHRS_register.sr = input;
    write(TCOOLTHRS_register.address, TCOOLTHRS_register.sr);
}
 
// W: THIGH
uint32_t TMC2240Stepper::THIGH() { return THIGH_register.sr; }
void TMC2240Stepper::THIGH(uint32_t input) {
    THIGH_register.sr = input;
    write(THIGH_register.address, THIGH_register.sr);
}
 
// RW: SG4_THRS
uint32_t TMC2240Stepper::SG4_THRS() { return SG4_THRS_register.sr; }
void TMC2240Stepper::SG4_THRS(uint32_t input) {
    SG4_THRS_register.sr = input;
    write(SG4_THRS_register.address, SG4_THRS_register.sr);
}
uint8_t TMC2240Stepper::sg4_thrs() { return SG4_THRS_register.sg4_thrs; }
void TMC2240Stepper::sg4_thrs(uint8_t B) {
    SG4_THRS_register.sg4_thrs = B;
    write(SG4_THRS_register.address, SG4_THRS_register.sr);
}
bool TMC2240Stepper::sg4_filt_en() { return SG4_THRS_register.sg4_filt_en; }
void TMC2240Stepper::sg4_filt_en(bool B) {
    SG4_THRS_register.sg4_filt_en = B;
    write(SG4_THRS_register.address, SG4_THRS_register.sr);
}
uint8_t TMC2240Stepper::sg4_angle_offset() { return SG4_THRS_register.sg4_angle_offset; }
void TMC2240Stepper::sg4_angle_offset(uint8_t B) {
    SG4_THRS_register.sg4_angle_offset = B;
    write(SG4_THRS_register.address, SG4_THRS_register.sr);
}
 
// R:SG4_RESULT
uint32_t TMC2240Stepper::SG4_RESULT()   { return read(TMC2240_n::SG4_RESULT_t::address); }
uint16_t TMC2240Stepper::sg4_result()   { TMC2240_n::SG4_RESULT_t r; r.sr = SG4_RESULT(); return r.sg4_result; }
 
// RW: ADC_VSUPPLY_AIN
uint32_t TMC2240Stepper::ADC_VSUPPLY_AIN() {
    return read(TMC2240_n::ADC_VSUPPLY_AIN_t::address);
}
 
// RW: ADC_TEMP
uint32_t TMC2240Stepper::ADC_TEMP() {
    return read(TMC2240_n::ADC_TEMP_t::address);
}
 
// RW: OTW_OV_VTH
uint32_t TMC2240Stepper::OTW_OV_VTH() {
    return read(TMC2240_n::OTW_OV_VTH_t::address);
}
 
void TMC2240Stepper::OTW_OV_VTH(uint32_t input) {
    OTW_OV_VTH_register.sr = input;
    write(OTW_OV_VTH_register.address, OTW_OV_VTH_register.sr);
}
 
// R: AIN Voltage (ADC_AIN × 305.2 µV)
float TMC2240Stepper::get_ain_voltage() {
    TMC2240_n::ADC_VSUPPLY_AIN_t r;
    r.sr = ADC_VSUPPLY_AIN();
    return r.adc_ain * 0.0003052f;
}
 
// R: Supply Voltage (ADC_VSUPPLY × 9.732 mV)
float TMC2240Stepper::get_vsupply_voltage() {
    TMC2240_n::ADC_VSUPPLY_AIN_t r;
    r.sr = ADC_VSUPPLY_AIN();
    return r.adc_vsupply * 0.009732f;
}
 
// R: Internal temperature in °C
float TMC2240Stepper::get_chip_temperature() {
    TMC2240_n::ADC_TEMP_t r;
    r.sr = ADC_TEMP();
    return (r.adc_temp - 2038.0f) * (1.0f / 7.7f);
}
 
// RW: OVERTEMPPREWARNING_VTH (°C)
float TMC2240Stepper::get_overtemp_prewarn_celsius() {
    TMC2240_n::OTW_OV_VTH_t r;
    r.sr = OTW_OV_VTH();
    return (r.overtemp_prewarn_vth - 2038.0f) * (1.0f / 7.7f);
}
 
void TMC2240Stepper::set_overtemp_prewarn_celsius(float tempC) {
    uint16_t adc_temp_th = (uint16_t)(tempC * 7.7f + 2038.0f + 0.5f);
    TMC2240_n::OTW_OV_VTH_t r;
    r.sr = OTW_OV_VTH();
    r.overtemp_prewarn_vth = adc_temp_th;
    write(r.address, r.sr);
}
 
// RW: OVERVOLTAGE_VTH (V)
float TMC2240Stepper::get_overvoltage_threshold_voltage() {
    TMC2240_n::OTW_OV_VTH_t r;
    r.sr = OTW_OV_VTH();
    return r.overvoltage_vth * 0.009732f;
}
 
void TMC2240Stepper::set_overvoltage_threshold_voltage(float volts) {
    uint16_t adc_vth = (uint16_t)(volts / 0.009732f + 0.5f);
    TMC2240_n::OTW_OV_VTH_t r;
    r.sr = OTW_OV_VTH();
    r.overvoltage_vth = adc_vth;
    write(r.address, r.sr);
}
 
// RO: MSCNT
uint16_t TMC2240Stepper::MSCNT() { return read(MSCNT_t::address); }
 
// RO: MSCURACT
uint32_t TMC2240Stepper::MSCURACT() { return read(TMC2240_n::MSCURACT_t::address); }
int16_t TMC2240Stepper::cur_a() {
  TMC2240_n::MSCURACT_t r{};
  r.sr = MSCURACT();
  int16_t value = r.cur_a;
  if (value > 255) value -= 512;
  return value;
}
int16_t TMC2240Stepper::cur_b() {
  TMC2240_n::MSCURACT_t r{};
  r.sr = MSCURACT();
  int16_t value = r.cur_b;
  if (value > 255) value -= 512;
  return value;
}