hoverboard-firmware-hack-serial-esc/Src/bldc.c

#include "stm32f1xx_hal.h"
#include "defines.h"
#include "setup.h"
#include "config.h"


volatile int posl = 0;
volatile int posr = 0;
volatile int pwml = 0;
volatile int pwmr = 0;
volatile int weakl = 0;
volatile int weakr = 0;

extern volatile int speed;

extern volatile adc_buf_t adc_buffer;

extern volatile uint32_t timeout;

uint8_t buzzerFreq = 0;
uint8_t buzzerPattern = 0;

uint8_t enable = 0;

const int pwm_res = 64000000 / 2 / PWM_FREQ; // = 2000

const uint8_t hall_to_pos[8] = {
    0,
    0,
    2,
    1,
    4,
    5,
    3,
    0,
};

inline void blockPWM(int pwm, int pos, int *u, int *v, int *w) {
  switch(pos) {
    case 0:
      *u = 0;
      *v = pwm;
      *w = -pwm;
      break;
    case 1:
      *u = -pwm;
      *v = pwm;
      *w = 0;
      break;
    case 2:
      *u = -pwm;
      *v = 0;
      *w = pwm;
      break;
    case 3:
      *u = 0;
      *v = -pwm;
      *w = pwm;
      break;
    case 4:
      *u = pwm;
      *v = -pwm;
      *w = 0;
      break;
    case 5:
      *u = pwm;
      *v = 0;
      *w = -pwm;
      break;
    default:
      *u = 0;
      *v = 0;
      *w = 0;
  }
}

inline void blockPhaseCurrent(int pos, int u, int v, int *q) {
  switch(pos) {
    case 0:
      *q = u - v;
      // *u = 0;
      // *v = pwm;
      // *w = -pwm;
      break;
    case 1:
      *q = u;
      // *u = -pwm;
      // *v = pwm;
      // *w = 0;
      break;
    case 2:
      *q = u;
      // *u = -pwm;
      // *v = 0;
      // *w = pwm;
      break;
    case 3:
      *q = v;
      // *u = 0;
      // *v = -pwm;
      // *w = pwm;
      break;
    case 4:
      *q = v;
      // *u = pwm;
      // *v = -pwm;
      // *w = 0;
      break;
    case 5:
      *q = -(u - v);
      // *u = pwm;
      // *v = 0;
      // *w = -pwm;
      break;
    default:
      *q = 0;
      // *u = 0;
      // *v = 0;
      // *w = 0;
  }
}

uint16_t buzzerTimer        = 0;

int offsetcount = 0;
int offsetrl1   = 2000;
int offsetrl2   = 2000;
int offsetrr1   = 2000;
int offsetrr2   = 2000;
int offsetdcl   = 2000;
int offsetdcr   = 2000;

float batteryVoltage = BAT_NUMBER_OF_CELLS * 4.0;

int curl = 0;
// int errorl = 0;
// int kp = 5;
// volatile int cmdl = 0;

int last_pos = 0;
int timer = 0;
const int max_time = PWM_FREQ / 10;
volatile int vel = 0;

//scan 8 channels with 2ADCs @ 20 clk cycles per sample
//meaning ~80 ADC clock cycles @ 8MHz until new DMA interrupt =~ 100KHz
//=640 cpu cycles
void DMA1_Channel1_IRQHandler() {
  DMA1->IFCR = DMA_IFCR_CTCIF1;
  // HAL_GPIO_WritePin(LED_PORT, LED_PIN, 1);

  if(offsetcount < 1000) {  // calibrate ADC offsets
    offsetcount++;
    offsetrl1 = (adc_buffer.rl1 + offsetrl1) / 2;
    offsetrl2 = (adc_buffer.rl2 + offsetrl2) / 2;
    offsetrr1 = (adc_buffer.rr1 + offsetrr1) / 2;
    offsetrr2 = (adc_buffer.rr2 + offsetrr2) / 2;
    offsetdcl = (adc_buffer.dcl + offsetdcl) / 2;
    offsetdcr = (adc_buffer.dcr + offsetdcr) / 2;
    return;
  }

  if (buzzerTimer % 100 == 0) {  // because you get float rounding errors if it would run every time
    batteryVoltage = batteryVoltage * 0.999 + ((float)adc_buffer.batt1 * ((float)BAT_CALIB_REAL_VOLTAGE / (float)BAT_CALIB_ADC)) * 0.001;
  }

  //disable PWM when current limit is reached (current chopping)
  if(ABS((adc_buffer.dcl - offsetdcl) * MOTOR_AMP_CONV_DC_AMP) > DC_CUR_LIMIT || timeout > TIMEOUT || enable == 0) {
    LEFT_TIM->BDTR &= ~TIM_BDTR_MOE;
    //HAL_GPIO_WritePin(LED_PORT, LED_PIN, 1);
  } else {
    LEFT_TIM->BDTR |= TIM_BDTR_MOE;
    //HAL_GPIO_WritePin(LED_PORT, LED_PIN, 0);
  }

  if(ABS((adc_buffer.dcr - offsetdcr) * MOTOR_AMP_CONV_DC_AMP)  > DC_CUR_LIMIT || timeout > TIMEOUT || enable == 0) {
    RIGHT_TIM->BDTR &= ~TIM_BDTR_MOE;
  } else {
    RIGHT_TIM->BDTR |= TIM_BDTR_MOE;
  }

  int ul, vl, wl;
  int ur, vr, wr;

  //determine next position based on hall sensors
  uint8_t hall_ul = !(LEFT_HALL_U_PORT->IDR & LEFT_HALL_U_PIN);
  uint8_t hall_vl = !(LEFT_HALL_V_PORT->IDR & LEFT_HALL_V_PIN);
  uint8_t hall_wl = !(LEFT_HALL_W_PORT->IDR & LEFT_HALL_W_PIN);

  uint8_t hall_ur = !(RIGHT_HALL_U_PORT->IDR & RIGHT_HALL_U_PIN);
  uint8_t hall_vr = !(RIGHT_HALL_V_PORT->IDR & RIGHT_HALL_V_PIN);
  uint8_t hall_wr = !(RIGHT_HALL_W_PORT->IDR & RIGHT_HALL_W_PIN);

  uint8_t halll = hall_ul * 1 + hall_vl * 2 + hall_wl * 4;
  posl          = hall_to_pos[halll];
  posl += 2;
  posl %= 6;

  uint8_t hallr = hall_ur * 1 + hall_vr * 2 + hall_wr * 4;
  posr          = hall_to_pos[hallr];
  posr += 2;
  posr %= 6;

  blockPhaseCurrent(posl, adc_buffer.rl1 - offsetrl1, adc_buffer.rl2 - offsetrl2, &curl);

  //setScopeChannel(2, (adc_buffer.rl1 - offsetrl1) / 8);
  //setScopeChannel(3, (adc_buffer.rl2 - offsetrl2) / 8);

  //create square wave for buzzer
  buzzerTimer++;
  if (buzzerFreq != 0 && (buzzerTimer / 5000) % (buzzerPattern + 1) == 0) {
    if (buzzerTimer % buzzerFreq == 0) {
      HAL_GPIO_TogglePin(BUZZER_PORT, BUZZER_PIN);
    }
  } else {
      HAL_GPIO_WritePin(BUZZER_PORT, BUZZER_PIN, 0);
  }

  //update PWM channels based on position
  blockPWM(pwml, posl, &ul, &vl, &wl);
  blockPWM(pwmr, posr, &ur, &vr, &wr);

  int weakul, weakvl, weakwl;
  if (pwml > 0) {
    blockPWM(weakl, (posl+5) % 6, &weakul, &weakvl, &weakwl);
  } else {
    blockPWM(-weakl, (posl+1) % 6, &weakul, &weakvl, &weakwl);
  }
  ul += weakul;
  vl += weakvl;
  wl += weakwl;

  int weakur, weakvr, weakwr;
  if (pwmr > 0) {
    blockPWM(weakr, (posr+5) % 6, &weakur, &weakvr, &weakwr);
  } else {
    blockPWM(-weakr, (posr+1) % 6, &weakur, &weakvr, &weakwr);
  }
  ur += weakur;
  vr += weakvr;
  wr += weakwr;

  LEFT_TIM->LEFT_TIM_U = CLAMP(ul + pwm_res / 2, 10, pwm_res-10);
  LEFT_TIM->LEFT_TIM_V = CLAMP(vl + pwm_res / 2, 10, pwm_res-10);
  LEFT_TIM->LEFT_TIM_W = CLAMP(wl + pwm_res / 2, 10, pwm_res-10);

  RIGHT_TIM->RIGHT_TIM_U = CLAMP(ur + pwm_res / 2, 10, pwm_res-10);
  RIGHT_TIM->RIGHT_TIM_V = CLAMP(vr + pwm_res / 2, 10, pwm_res-10);
  RIGHT_TIM->RIGHT_TIM_W = CLAMP(wr + pwm_res / 2, 10, pwm_res-10);
}