STM32F0 硬件IIC卡死

我叫做大熙熙 · 发表于 2017-12-20 15:51:46

本帖最后由我叫做大熙熙于 2017-12-20 15:53 编辑

芯片：STM32F071CB
管脚定义：PB13 - I2C_SCL
PB14 - I2C_SDA

STM32F0 管脚复用说明

相关源码程序如下：
[mw_shl_code=c,true]void i2c_config()
{
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_5);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_5);

GPIO_Init(GPIOB,&(GPIO_InitTypeDef){
   .GPIO_Mode  = GPIO_Mode_AF,
   .GPIO_OType = GPIO_OType_OD,
   .GPIO_PuPd  = GPIO_PuPd_UP,
   .GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14,
      .GPIO_Speed = GPIO_Speed_2MHz});

RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);

I2C_Init(I2C2,&(I2C_InitTypeDef){
      .I2C_Mode             = I2C_Mode_SMBusHost,//I2C_Mode_I2C,
      .I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit,
      .I2C_AnalogFilter       = I2C_AnalogFilter_Disable,
      .I2C_DigitalFilter    = 0x00,
      .I2C_OwnAddress1       = 0x00,
      .I2C_Ack                = I2C_Ack_Enable,
      .I2C_Timing             = I2C_TIMING}); //I2C TIMING计算器计算

I2C_Cmd(I2C2, ENABLE);
}

/* 写N字节数据 */
Error i2c_write_nBytes(uint8_t bytesNum,uint8_t *buffer)
{
i2cTimeout = I2C_TIME_OUT;
while(I2C_GetFlagStatus(I2C2,I2C_FLAG_BUSY) != RESET){
      if((i2cTimeout--) == 0){
         return ERROR_FLAG_BUSY;
      }
}

I2C_TransferHandling(I2C2,SDP_ADDRESS,1,I2C_Reload_Mode,I2C_Generate_Start_Write); 注释(1) //这句运行完后IIC_ISR状态如下

i2cTimeout = I2C_TIME_OUT;
while(I2C_GetFlagStatus(I2C2,I2C_FLAG_TXIS) == RESET){ //问题出在这里,TXIS一直都是0(RESET)状态
      if((i2cTimeout--) == 0){
         return ERROR_FLAG_TXIS;
      }
}

I2C_SendData(I2C2,SDP_ADDRESS);

i2cTimeout = I2C_TIME_OUT;
   while(I2C_GetFlagStatus(I2C2,I2C_FLAG_TCR) == RESET){
      if((i2cTimeout--) == 0){
      return ERROR_FLAG_TCR;
      }
   }

I2C_TransferHandling(I2C2,SDP_ADDRESS,bytesNum,I2C_AutoEnd_Mode,I2C_No_StartStop);

  for(uint8_t i = 0; i < bytesNum; i++){
i2cTimeout = I2C_TIME_OUT;
while(I2C_GetFlagStatus(I2C2, I2C_FLAG_TXIS) == RESET){
   if((i2cTimeout--) == 0){
      return ERROR_FLAG_TXIS;
   }
}
I2C_SendData(I2C2, buffer[bytesNum]);
  }

  i2cTimeout = I2C_TIME_OUT;
  while(I2C_GetFlagStatus(I2C2, I2C_FLAG_STOPF) == RESET){
if((i2cTimeout--) == 0){
   return ERROR_FLAG_STOPF;
}
  }

  return ERROR_NONE;
}
[/mw_shl_code]
注释（1）：ISR状态

IIC_ISR寄存器状态