STM32 I2C超时
I2C 初始化代码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_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
}
void HAL_I2C_MspInit(I2C_HandleTypeDef* i2cHandle)
{
GPIO_InitTypeDef GPIO_InitStruct;
//GPIO_InitTypeDef GPIO_InitStruct;
if(i2cHandle->Instance==I2C1)
{
/* USER CODE BEGIN I2C1_MspInit 0 */
__HAL_RCC_I2C1_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7; //????
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; //GPIO?????
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; //???
HAL_GPIO_Init(GPIOB,&GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOB, 6, GPIO_PIN_SET); //??SCL
HAL_GPIO_WritePin(GPIOB, 7, GPIO_PIN_SET); //??SDA
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_6|GPIO_PIN_7);
i2cHandle->Instance->CR1= I2C_CR1_SWRST; //??I2C???
i2cHandle->Instance->CR1= 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.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* I2C1 clock enable */
//__HAL_RCC_I2C1_CLK_ENABLE();
/* USER CODE BEGIN I2C1_MspInit 1 */
/* USER CODE END I2C1_MspInit 1 */
}
}测试发现返回为超时错误。逻辑分析仪抓出数据还没有发送从地址
传说中的STM32硬件I2C？ 不妨试试软件模拟I2C吧 楼主用的HAL库，传说中的所谓硬件I2C问题应该不存在。
楼主设的是低速模式，换成高速模式看一下。
在CubeMx中将I2C的改为高速。
HAL_I2C_Read和write的timeout参数设大一点，或者干脆设为最大值，看看通讯是否成功。
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