STM32H743+BMI088 I2C调试记录_bmi088 stm32-优快云博客

最近遇到需要调试博世的一款IMU芯片，调好了留个纪念~

首先CUBEMX配置I2C，这里不多做赘述，参数默认即可。

然后要关注一下硬件IMU来判断一下I2C地址：

根据数据手册可以得知加速度计和陀螺仪的地址是不一样的，根据硬件接法的不同有两种情况，此处大家根据硬件选择。

这个芯片我们需要的数据就是三个方向的加速度和角加速度，我们首先来看加速度：

他这个加速度是一个s16的值，由两个u8拼凑而成，同时还有一个寄存器用来控制加速度的范围：

所以我们要做的就是读寄存器，然后拼接值，再根据范围确定这个值，同时这个加速度值还有一个计算方式：

这边不多做赘述，我们直接上代码：

//开始之前首先要对芯片进行复位操作
void imu_init(void) {
    i2c_txbuf[0] = 0x7E;
    i2c_txbuf[1] = 0xB6;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 2, 1000);
    HAL_Delay(10);
    i2c_txbuf[0] = 0x7D;
    i2c_txbuf[1] = 0x04;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 2, 1000);
    HAL_Delay(10);
    i2c_txbuf[0] = 0x12;
}

float calculateAccel(int16_t Accel_int16) {
    float Accel_in_mg = (Accel_int16 / 32768.0) * 1000 * pow(2, (bmi088.acc_range + 1)) * 1.5;
    return Accel_in_mg;
}

void set_acc_range(uint8_t pRange) {
    i2c_txbuf[0] = 0x41;
    i2c_txbuf[1] = pRange;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 2, 1000);
}

void get_acc_range(void) {
    i2c_txbuf[0] = 0x41;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0x30, i2c_rxbuf, 1, 1000);
    bmi088.acc_range = i2c_rxbuf[0];
}

void set_acc_bwp_odr(uint8_t pBwp, uint8_t pOdr) {
    i2c_txbuf[0] = 0x40;
    i2c_txbuf[1] = ((pBwp << 4) | (pOdr & 0x0F));
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 2, 1000);
}

void get_acc_bwp_odr(void) {
    i2c_txbuf[0] = 0x40;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0x30, i2c_rxbuf, 1, 1000);
    bmi088.acc_bwp = (i2c_rxbuf[0] >> 4);
    bmi088.acc_odr = (i2c_rxbuf[0] & 0x0F);
}

void get_accelerometer(void) {
    uint8_t acc_l = 0;
    uint8_t acc_m = 0;
    //ACC_X
    i2c_txbuf[0] = 0x12;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0x30, i2c_rxbuf, 1, 1000);
    acc_l = i2c_rxbuf[0];
    i2c_txbuf[0] = 0x13;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0x30, i2c_rxbuf, 1, 1000);
    acc_m = i2c_rxbuf[0];
    bmi088.acceleration_x = calculateAccel(((int16_t)(acc_m << 8) | acc_l));
    //ACC_Y
    i2c_txbuf[0] = 0x14;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0x30, i2c_rxbuf, 1, 1000);
    acc_l = i2c_rxbuf[0];
    i2c_txbuf[0] = 0x15;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0x30, i2c_rxbuf, 1, 1000);
    acc_m = i2c_rxbuf[0];
    bmi088.acceleration_y = calculateAccel(((int16_t)(acc_m << 8) | acc_l));
    //ACC_Z
    i2c_txbuf[0] = 0x16;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0x30, i2c_rxbuf, 1, 1000);
    acc_l = i2c_rxbuf[0];
    i2c_txbuf[0] = 0x17;
    HAL_I2C_Master_Transmit(&hi2c1, 0x30, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0x30, i2c_rxbuf, 1, 1000);
    acc_m = i2c_rxbuf[0];
    bmi088.acceleration_z = calculateAccel(((int16_t)(acc_m << 8) | acc_l));
}

之后是角加速度，与加速度同样：

思路上还是一样：

void set_gyro_range(uint8_t pRange) {
    i2c_txbuf[0] = 0x0F;
    i2c_txbuf[1] = pRange;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 2, 1000);
}

void get_gyro_range(void) {
    i2c_txbuf[0] = 0x0F;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0xD0, i2c_rxbuf, 1, 1000);
    bmi088.gyro_range = i2c_rxbuf[0];
}

void set_gyro_bwp(uint8_t pBwp) {
    i2c_txbuf[0] = 0x10;
    i2c_txbuf[1] = pBwp;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 2, 1000);
}

void get_gyro_bwp(void) {
    i2c_txbuf[0] = 0x10;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0xD0, i2c_rxbuf, 1, 1000);
    bmi088.gyro_bwp = i2c_rxbuf[0];
}

void get_gyro(void) {
    uint8_t acc_l = 0;
    uint8_t acc_m = 0;
    //ACC_X
    i2c_txbuf[0] = 0x02;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0xD0, i2c_rxbuf, 1, 1000);
    acc_l = i2c_rxbuf[0];
    i2c_txbuf[0] = 0x03;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0xD0, i2c_rxbuf, 1, 1000);
    acc_m = i2c_rxbuf[0];
    bmi088.gyro_x = ((int16_t)(acc_m << 8) | acc_l);
    //ACC_Y
    i2c_txbuf[0] = 0x04;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0xD0, i2c_rxbuf, 1, 1000);
    acc_l = i2c_rxbuf[0];
    i2c_txbuf[0] = 0x05;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0xD0, i2c_rxbuf, 1, 1000);
    acc_m = i2c_rxbuf[0];
    bmi088.gyro_y = ((int16_t)(acc_m << 8) | acc_l);
    //ACC_Z
    i2c_txbuf[0] = 0x06;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0xD0, i2c_rxbuf, 1, 1000);
    acc_l = i2c_rxbuf[0];
    i2c_txbuf[0] = 0x07;
    HAL_I2C_Master_Transmit(&hi2c1, 0xD0, i2c_txbuf, 1, 1000);
    HAL_I2C_Master_Receive(&hi2c1, 0xD0, i2c_rxbuf, 1, 1000);
    acc_m = i2c_rxbuf[0];
    bmi088.gyro_z = ((int16_t)(acc_m << 8) | acc_l);
}

本身并不是特别复杂，主要是啃芯片手册花了些时间，希望能够对你有所帮助~