32blit-stm32/Src/i2c-bq24295.c

#include "i2c-bq24295.h"

static void _i2c_send_8(I2C_HandleTypeDef *i2c_port, uint8_t address, uint8_t reg, uint8_t data);
static uint8_t _i2c_recv_8(I2C_HandleTypeDef *i2c_port, uint8_t address, uint8_t reg);
static uint16_t _i2c_recv_16(I2C_HandleTypeDef *i2c_port, uint16_t address, uint8_t reg );

bool bq24295_init(I2C_HandleTypeDef *i2c_port) {
    uint8_t chip_id = _i2c_recv_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_ID_REGISTER);

    if (chip_id >> 5 == BQ24294_PART_NUMBER) {
        /*uint8_t op_timer = _i2c_recv_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_TIMER_REGISTER);
        op_timer &= 0b11001111; // Set WATCHDOG to 0b00
        op_timer |= 0b00010000; // Set WATCHDOG to 0b01
        _i2c_send_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_TIMER_REGISTER, op_timer);

        uint8_t op_power = _i2c_recv_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_POWER_CFG_REGISTER);
        op_timer |= 0b01000000; // Reset WATCHDOG
        _i2c_send_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_POWER_CFG_REGISTER, op_power);*/

        return true;
    }
    return false;
}

uint16_t bq24295_get_statusfault(I2C_HandleTypeDef *i2c_port) {
    return _i2c_recv_16(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_SYS_STATUS_REGISTER);
}

uint8_t bq24295_get_status(I2C_HandleTypeDef *i2c_port) {
    return _i2c_recv_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_SYS_STATUS_REGISTER);
}

uint8_t bq24295_get_fault(I2C_HandleTypeDef *i2c_port) {
    return _i2c_recv_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_SYS_FAULT_REGISTER);
}

void bq24295_disable_battery_fault_int(I2C_HandleTypeDef *i2c_port){
    uint8_t op_timer = _i2c_recv_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_TIMER_REGISTER);
    op_timer &= 0b11001111; // Set WATCHDOG to 0b00
    _i2c_send_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_TIMER_REGISTER, op_timer);

    uint8_t op_control = _i2c_recv_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_OP_CONTROL_REGISTER);
    op_control &= ~0b00000011; // Set INT_MASK BAT_FAULT bit to 0
    _i2c_send_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_OP_CONTROL_REGISTER, op_control);
}

void bq24295_enable_shipping_mode(I2C_HandleTypeDef *i2c_port){
    uint8_t op_timer = _i2c_recv_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_TIMER_REGISTER);
    op_timer &= 0b11001111; // Set WATCHDOG to 0b00
    _i2c_send_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_TIMER_REGISTER, op_timer);

    uint8_t op_control = _i2c_recv_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_OP_CONTROL_REGISTER);
    op_control |= 0b00100000; // Set BATTFET_Disable to 1
    _i2c_send_8(i2c_port, BQ24295_DEVICE_ADDRESS, BQ24295_OP_CONTROL_REGISTER, op_control);
}

static uint8_t _i2c_recv_8(I2C_HandleTypeDef *i2c_port,  uint8_t address, uint8_t reg ){
    uint8_t result;
    HAL_I2C_Master_Transmit(i2c_port, address, &reg, 1, HAL_TIMEOUT);  
    HAL_Delay(1); 
    HAL_I2C_Master_Receive(i2c_port, address, &result, 1, HAL_TIMEOUT);
    return result;
}

static void _i2c_send_8(I2C_HandleTypeDef *i2c_port, uint8_t address, uint8_t reg, uint8_t data){
    uint8_t data_buffer[2];
    data_buffer[0] = reg;
    data_buffer[1] = data;
    HAL_I2C_Master_Transmit(i2c_port, address, &data_buffer[0], 2, HAL_TIMEOUT);
}

static uint16_t _i2c_recv_16(I2C_HandleTypeDef *i2c_port, uint16_t address, uint8_t reg ){
  uint8_t receive_buffer[2];

  HAL_I2C_Master_Transmit(i2c_port, address, &reg, 1, HAL_TIMEOUT); //set register pointer
  HAL_Delay(1);
  HAL_I2C_Master_Receive(i2c_port, address, &receive_buffer[0], 2, HAL_TIMEOUT); //read two bytes from register

  return (uint16_t)(receive_buffer[0] << 8) + receive_buffer [1]; //combine MSB LSB
}