I2C 配置

只看该作者 · 2019-4-12 11:25

大佬帮忙看一下，这个I2C初始换后为什么SCL没有时钟，代码如下：
I2C_HandleTypeDef  hi2c2;
/*I2C_GPIO 配置*/
static void I2C_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

   __HAL_RCC_I2C2_CLK_ENABLE();    //使能I2C时钟

__HAL_RCC_GPIOH_CLK_ENABLE(); //使能GPIOH时钟

   /*PH4  SCL2, PH5 SDA2*/
GPIO_InitStructure.Pin=GPIO_PIN_4; //PH4
GPIO_InitStructure.Mode=GPIO_MODE_AF_OD;    //复用开漏输出
GPIO_InitStructure.Pull=GPIO_PULLUP;          //
GPIO_InitStructure.Speed=GPIO_SPEED_FREQ_HIGH;    //高速
   GPIO_InitStructure.Alternate = GPIO_AF4_I2C2;
HAL_GPIO_Init(GPIOH,&GPIO_InitStructure);      //初始化GPIOH4

   GPIO_InitStructure.Pin=GPIO_PIN_5; //PH5
   GPIO_InitStructure.Alternate = GPIO_AF4_I2C2;
   HAL_GPIO_Init(GPIOH,&GPIO_InitStructure);      //初始化GPIOH5
   /* Force the I2C peripheral clock reset */
   __HAL_RCC_I2C2_FORCE_RESET();
   /* Release the I2C peripheral clock reset */
__HAL_RCC_I2C2_RELEASE_RESET();
}

/* I2C工作模式配置 */
static void I2C_Init(void)
{

   hi2c2.Instance = I2C2;
   hi2c2.Init.Timing = 0x00901954;
   hi2c2.Init.OwnAddress1 = 0;
   hi2c2.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c2.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c2.Init.OwnAddress2 = 0XFF;
hi2c2.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
hi2c2.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c2.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
   HAL_I2C_Init(&hi2c2);

HAL_I2CEx_AnalogFilter_Config(&hi2c2, I2C_ANALOGFILTER_ENABLE);

}