STM32 I2C 问题

1万 · 2010-7-15 17:01

if (TxLength >0)
            {
               I2C_SendData(I2C1, *pTxBuffer1++);
               TxLength--;
            }
            /* Disable the I2C_IT_BUF interrupt after sending the last buffer data
            (last EV8) to no allow a new interrupt with TxE and only BTF could generate it */
            else if(TxLength == 0)
            {
            I2C_ITConfig(I2C1,  I2C_IT_BUF, DISABLE);
            I2C_GenerateSTOP(I2C1, ENABLE);             }

和前面28楼处理差不多，只是你先关闭了中断，再stop
我试试看

1万 · 2010-7-15 17:10

lut1lut 的程序：

  if (TxLength >0)
            {
               I2C_SendData(I2C1, *pTxBuffer1++);
               TxLength--;
            }
            /* Disable the I2C_IT_BUF interrupt after sending the last buffer data
            (last EV8) to no allow a new interrupt with TxE and only BTF could generate it */
            else if(TxLength == 0)
            {
            I2C_ITConfig(I2C1,  I2C_IT_BUF, DISABLE);
            I2C_GenerateSTOP(I2C1, ENABLE);             }
            break;

本人的程序：
  case I2C_EVENT_MASTER_BYTE_TRANSMITTING:  /* Without BTF, EV8 */
   if(i2cSendCount < i2cSendLen)
   {
      I2C_SendData(I2C1, i2cSendBuf[i2cSendCount++]);
   }
   else
   {
      I2C_ITConfig(I2C1, I2C_IT_BUF, DISABLE);
      I2C_GenerateSTOP(I2C1, ENABLE);
   }

   break;

两者一样吧？
但是照样会产生多个0x70084，

但是吧I2C_GenerateSTOP(I2C1, ENABLE); 移动到0x70080中断事件中处理，
尽管有多个0x70084，
但是不需要等待
while(I2C_GetLastEvent(I2C1) == I2C_EVENT_MASTER_BYTE_TRANSMITTED);

程序也能正常工作。

只是不知其所以然