再问STM32的硬件I2C与软件模拟-第9页回答

1楼-- · 2019-12-18 11:00

本帖最后由 godsend 于 2017-3-11 09:06 编辑

int 发表于 2017-3-10 14:13
好的，谢谢老哥！

uint8_t I2C1_TransferFlag = 0;
uint8_t I2C1_Step = 0;
uint8_t I2C1_Mode = 0;
uint8_t I2C1_DeviceAddress = 0;
uint8_t I2C1_RegisterAddress = 0;
uint8_t I2C1_DeviceMeneyType = 0;
uint8_t I2C1_DataLength = 0;
uint8_t I2C1_RxBuff[I2C1_RxMax];
uint8_t I2C1_TxBuff[I2C1_TxMax];

void I2C1_InitStructure(void)
{
  I2C_InitTypeDef I2C1_InitSturcture;
  DMA_InitTypeDef DMA_InitStrecture;

  I2C_DeInit(I2C1);
  DMA_DeInit(DMA1_Stream0);
  DMA_DeInit(DMA1_Stream6);

  I2C1_InitSturcture.I2C_ClockSpeed = 100000;
  I2C1_InitSturcture.I2C_Mode = I2C_Mode_I2C;
  I2C1_InitSturcture.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C1_InitSturcture.I2C_OwnAddress1 = 0x00;
  I2C1_InitSturcture.I2C_Ack = I2C_Ack_Enable;
  I2C1_InitSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

  I2C_ITConfig(I2C1, I2C_IT_EVT|I2C_IT_ERR, ENABLE);
  I2C_Init(I2C1, &I2C1_InitSturcture);
  I2C_DMACmd(I2C1, ENABLE);
  I2C_Cmd(I2C1, ENABLE);

  DMA_InitStrecture.DMA_Channel = DMA_Channel_1;//I2C1_RX
  DMA_InitStrecture.DMA_PeripheralBaseAddr = (uint32_t)(&(I2C1->DR));
  DMA_InitStrecture.DMA_Memory0BaseAddr = (uint32_t)I2C1_RxBuff;
  DMA_InitStrecture.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStrecture.DMA_BufferSize = I2C1_RxMax;
  DMA_InitStrecture.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStrecture.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStrecture.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStrecture.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStrecture.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStrecture.DMA_Priority = DMA_Priority_High;
  DMA_InitStrecture.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStrecture.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStrecture.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStrecture.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

  //DMA_ITConfig(DMA1_Stream0, DMA_IT_TC, ENABLE);
  DMA_ITConfig(DMA1_Stream0, DMA_IT_HT, ENABLE);
  DMA_Init(DMA1_Stream0, &DMA_InitStrecture);
  DMA_Cmd(DMA1_Stream0, DISABLE);
}

void I2C1_SendData(uint8_t DeviceAddress, uint16_t RegisterAddress, uint8_t DeviceMeneyType, uint8_t DataLength)
{
  if(!I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
  {
I2C1_TransferFlag = 1;

I2C_ClearFlag(I2C1, I2C_FLAG_BUSY);
I2C_ClearFlag(I2C1, I2C_FLAG_BERR);

I2C1_Step = 0;
I2C1_Mode = I2C1_WriteMode;
I2C1_DeviceAddress = DeviceAddress;
I2C1_RegisterAddress = RegisterAddress;
I2C1_DataLength = DataLength;

I2C_AcknowledgeConfig(I2C1, ENABLE);
I2C_GenerateSTART(I2C1, ENABLE);
  }
}

void I2C1_ReceiveData(uint8_t DeviceAddress, uint16_t RegisterAddress, uint8_t DeviceMeneyType, uint8_t DataLength)
{
  if(!I2C1_TransferFlag)
  {
if(!I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
{
   I2C1_TransferFlag = 1;

   I2C1_Step = 0;
   I2C1_Mode = I2C1_ReadMode;
   I2C1_DeviceAddress = DeviceAddress;
   I2C1_RegisterAddress = RegisterAddress;
   I2C1_DeviceMeneyType = DeviceMeneyType;
   I2C1_DataLength = DataLength;

   I2C_ReceiveData(I2C1);
   I2C_AcknowledgeConfig(I2C1, ENABLE);
   I2C_ITConfig(I2C1, I2C_IT_EVT|I2C_IT_ERR, ENABLE);
   I2C_GenerateSTART(I2C1, ENABLE);
}
  }
}

void I2C1_EV_IRQHandler(void)
{
  LastEven = I2C_GetLastEvent(I2C1);
  if(I2C1_Mode == I2C1_ReadMode)
  {
switch(LastEven)
{
   case I2C_EVENT_MASTER_MODE_SELECT:
         if(I2C1_Step == 0)
         {
         I2C_Send7bitAddress(I2C1, I2C1_DeviceAddress, I2C_Direction_Transmitter);
         }

         if(I2C1_DeviceMeneyType == I2C1_MeneyType8)
         {
         if(I2C1_Step == 4)
         {
            I2C_Send7bitAddress(I2C1, I2C1_DeviceAddress, I2C_Direction_Receiver);
         }
         }
         else
         {
         if(I2C1_Step == 5)
         {
            I2C_Send7bitAddress(I2C1, I2C1_DeviceAddress, I2C_Direction_Receiver);
         }
         }

         I2C1_Step++;
         break;
   case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED:
         I2C_SendData(I2C1, ((uint8_t) (I2C1_RegisterAddress)));
         I2C1_Step++;
         break;
   case I2C_EVENT_MASTER_BYTE_TRANSMITTED:
         if(I2C1_DeviceMeneyType == I2C1_MeneyType8)
         {
         if(I2C1_Step == 3)
         {
            I2C_GenerateSTART(I2C1, ENABLE);
         }
         else
         {
            //I2C_SendData(I2C1, RegisterAddress);
         }
         }
         else
         {
         if(I2C1_Step == 3)
         {
            I2C_SendData(I2C1, ((uint8_t) (I2C1_RegisterAddress >> 8)));
         }

         if(I2C1_Step == 4)
         {
            I2C_GenerateSTART(I2C1, ENABLE);
         }
         I2C1_Step++;
         break;
   case I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED:
         DMA_ClearITPendingBit(DMA1_Stream0, DMA_IT_HTIF0);
         DMA_ClearITPendingBit(DMA1_Stream0, DMA_IT_TCIF0);
         DMA_ITConfig(DMA1_Stream0, DMA_IT_HT, ENABLE);
         DMA_ITConfig(DMA1_Stream0, DMA_IT_TC, ENABLE);
         DMA_SetCurrDataCounter(DMA1_Stream0, I2C1_DataLength*2);
         DMA_Cmd(DMA1_Stream0, ENABLE);
         I2C_ITConfig(I2C1, I2C_IT_EVT, DISABLE);
         I2C1_Step++;
         break;
   default:I2C1_Step = 0; break;
   }
}
}

  if(I2C1_Mode == I2C1_WriteMode)
  {

  }
}

void I2C1_ER_IRQHandler(void)
{
  if(I2C_GetITStatus(I2C1, I2C_IT_TIMEOUT))
  {
I2C_ClearITPendingBit(I2C1, I2C_IT_TIMEOUT);
  }

  if(I2C_GetITStatus(I2C1, I2C_IT_PECERR))
  {
I2C_ClearITPendingBit(I2C1, I2C_IT_PECERR);
  }

  if(I2C_GetITStatus(I2C1, I2C_IT_AF))
  {
I2C_ClearITPendingBit(I2C1, I2C_IT_AF);
  }

  if(I2C_GetITStatus(I2C1, I2C_IT_BERR))
  {
I2C_ClearITPendingBit(I2C1, I2C_IT_BERR);
  }
  I2C_GenerateSTOP(I2C1, ENABLE);
}

程序就是这个样子，只写了8位地址，16位的没有写。你看看有什么不对的地方还请支出共同学习。