求助STM32F407硬件I2C配置之后用不了

w1w2w1 · 发表于 2021-4-8 12:05:55

STM32F407配置硬件I2C之后，SCL,SDA两根线都是高电平，请问各位大神，这是什么原因或者是配置哪里配置错了？求解
以下是硬件I2C的配置
void IicInit(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_ClocksTypeDef RCC_Clocks;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOB, &GPIO_InitStructure);    /* IIC Struct Initialize */
  I2C_DeInit(I2C1);
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = 0x00;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_ClockSpeed = 100000;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_Init(I2C1, &I2C_InitStructure); /* IIC Initialize */
                  I2C_Cmd(I2C1, ENABLE);
/*超时设置*/
RCC_GetClocksFreq(&RCC_Clocks);
ulTimeOut_Time = (RCC_Clocks.SYSCLK_Frequency /10000);
}

shumivan · 发表于 2021-4-9 09:29:51

//初始化IIC
void AT_IIC_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//使能GPIOA时钟
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);//使能GPIOC时钟

  //GPIOA8初始化设置
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//普通输出模式
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//50MHz
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化

//GPIOC9初始化设置
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//普通输出模式
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//50MHz
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
  GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化

AT_IIC_SCL=1;
AT_IIC_SDA=1;
}

/*****************存储*****************/

#define AT_SDA_IN()  {GPIOC->MODER&=~(3<<(9*2));GPIOC->MODER|=0<<(9*2);} //PC9输入模式
#define AT_SDA_OUT() {GPIOC->MODER&=~(3<<(9*2));GPIOC->MODER|=1<<(9*2);}  //PC9输出模式

//IO操作函数
#define AT_IIC_SCL PAout(8)          //SCL
#define AT_IIC_SDA PCout(9)          //SDA
#define AT_READ_SDA PCin(9)          //输入SDA