STM32F407 Discovery + MPU6050 I2C 不工作

yygk 提问时间：2015-10-20 15:33 /

本帖最后由 yygk 于 2015-10-20 15:41 编辑

各位大侠，
最近接触STM32，想着把MPU6050这种小板接上来小练习一下，但是I2C一直调不通，不知为何，老是AF错误。
Transmit一开始就fail了，老是报AF错误HAL_I2C_ERROR_AF。有玩过的不？

上来读一下deviceID =  MPU6050_Read_1BYTE((0x68<<1), 0x75);

unsigned char MPU6050_Read_1BYTE(unsigned char SlaveAddress,unsigned char REG_Address) {
HAL_StatusTypeDef status;
uint8_t data;

status = HAL_I2C_Master_Transmit(&hi2c1, SlaveAddress, ®_Address, 1, 1000);
if(status != HAL_OK) {
printf("I2C transmit error\n\r");
}

status = HAL_I2C_Master_Receive(&hi2c1, SlaveAddress, (uint8_t*)&data, 1, 1000);
if(status != HAL_OK) {
printf("I2C read 1 byte error\n\r");
}

return (unsigned char)data;
}
这个是I2C配置：
void MX_I2C1_Init(void)
{
  hi2c1.Instance = I2C1;
  hi2c1.Init.ClockSpeed = 100000;
  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
  HAL_I2C_Init(&hi2c1);
}

void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  if(hi2c->Instance==I2C1)
  {
  /* USER CODE BEGIN I2C1_MspInit 0 */
  /* USER CODE END I2C1_MspInit 0 */

/**I2C1 GPIO Configuration
PB6    ------> I2C1_SCL
PB7    ------> I2C1_SDA
*/
GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* Peripheral clock enable */
__I2C1_CLK_ENABLE();
  /* USER CODE BEGIN I2C1_MspInit 1 */
  /* USER CODE END I2C1_MspInit 1 */
  }
}

小板子图片就不上了，用的比较常见的淘宝小板，接口如下：
VCC 3.3v
GND 接地
SCL I2C 的时钟
SDA I2C 数据
XDA 可不接
XCL 可不接
AD0 mpu6050 地址选择（这里接地了）