MPU6050 在地址 0x68 上没有响应，但出现在 I2C 扫描地址中

Question

当我运行 STM32F303 上的 I2C 扫描器时，我看到两个设备都连接到总线。在地址 0x3C (OLED) 和地址 (0x68) MPU6050 上命名设备。这两个地址，特别同意数据表中的内容。

但是，当我尝试使用 HAL_I2C_IsDeviceReady 读取地址 0x68 上的 WHO_AM_I 寄存器时，我意识到它甚至会超时。

int main(void)
{
    HAL_Init();
    SystemClock_Config();

    MX_GPIO_Init();
    MX_I2C1_Init();
    MX_SPI1_Init();
    MX_TIM6_Init();
    MX_USART1_UART_Init();

    I2C_Scanner();
    SSD1306_Init();

    HAL_Delay (2000);

    MPU6050_Init();

    while (1)
    {

    }
}

检查设备是否准备就绪的函数 (MPU6050_Init)

static void MPU6050_Init(void)
{
    HAL_Delay(1);
    SSD1306_Clear();
    SSD1306_GotoXY (0, 0);
    char OutputArray[50] = {0};

    if(HAL_I2C_IsDeviceReady(&hi2c1, MPU6050_I2C_ADDR, 10, HAL_MAX_DELAY) != HAL_OK)
    {
        sprintf(OutputArray, "0x%02x : Not ready", MPU6050_I2C_ADDR);
    }
    else
    {
        HAL_GPIO_WritePin(LD3_GPIO_Port, LD3_Pin, GPIO_PIN_SET);

        uint8_t check;

        HAL_I2C_Mem_Read(&hi2c1, MPU6050_I2C_ADDR, WHO_AM_I_REG, 1, &check, 1, HAL_MAX_DELAY);

        sprintf(OutputArray,"0x%02x", (uint16_t)check);
    }
    HAL_Delay(1);
    SSD1306_Puts (OutputArray, &Font_7x10, SSD1306_COLOR_WHITE);
    SSD1306_UpdateScreen();
}

用于扫描 I2C 总线以查找可用设备的函数 (I2C_Scanner)

static void I2C_Scanner(void)
{
    HAL_StatusTypeDef result;
    uint8_t i;
    for (i = 1; i < 128; i++)
    {
        result = HAL_I2C_IsDeviceReady(&hi2c1, (uint16_t)(i << 1), 1, HAL_MAX_DELAY);
        char* period = ".";
        char OutputArray[5];

        if (result != HAL_OK) // HAL_ERROR or HAL_BUSY or HAL_TIMEOUT
        {
              HAL_UART_Transmit(&huart1, (uint8_t*)period, sizeof(period), HAL_MAX_DELAY);
        }

        if (result == HAL_OK)
        {
            sprintf(OutputArray, "0x%02x", i); // Received an ACK at that address
            HAL_UART_Transmit(&huart1, (uint8_t*)OutputArray, sizeof(OutputArray), HAL_MAX_DELAY);
        }

        HAL_Delay(1);
    }
}

初始化I2C的函数(MC_I2C1_Init)

static void MX_I2C1_Init(void)
{
    hi2c1.Instance = I2C1;
    hi2c1.Init.Timing = 0x0000020B;
    hi2c1.Init.OwnAddress1 = 0;
    hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
    hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
    hi2c1.Init.OwnAddress2 = 0;
    hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
    hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
    hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;

    if (HAL_I2C_Init(&hi2c1) != HAL_OK)
    {
        Error_Handler();
    }

    if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
    {
        Error_Handler();
    }

    if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
    {
        Error_Handler();
    }
}

预期的结果是检查设备是否可用、准备就绪并传回 WHO_AM_I 寄存器

的内容

Answer 1

找到解决办法。问题是我定义了 MPU6050 地址如下

#define MPU6050_I2C_ADDR    0x68

正确的定义应该是

#define MPU6050_I2C_ADDR    0x68 << 1

这导致 0xD0

MPU6050 在地址 0x68 上没有响应，但出现在 I2C 扫描地址中

MPU6050 not responding on address 0x68 but shows up in I2C Scanned addresses

hal

stm32

i2c

mpu6050