STM32 IIC 从机通信问题

发表于 2012-6-19 19:10

求一个从机通信程序...
功能是主接收从发送模式...
现在问题是主能接收一次  第二次就接收不到了...会卡在RECIVED_BYTE那里
不知什么原因...很可能是程序写错了...望指教...

void TRANSFER_Slave(void)
{
   while(!I2C_CheckEvent(I2C1,  I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED));
   I2C_SendData(I2C1, 0x01);
   while(!I2C_CheckEvent(I2C1, I2C_EVENT_SLAVE_BYTE_TRANSMITTED));
   I2C_SendData(I2C1, 0x02);
   while(!I2C_CheckEvent(I2C1, I2C_EVENT_SLAVE_BYTE_TRANSMITTED));
   I2C_SendData(I2C1, 0x03);
   while(!I2C_CheckEvent(I2C1, I2C_EVENT_SLAVE_BYTE_TRANSMITTED));
   I2C_SendData(I2C1, 0x04);
   while(!I2C_CheckEvent(I2C1, I2C_EVENT_SLAVE_BYTE_TRANSMITTED));
   // while(!I2C_CheckEvent(I2C1, I2C_EVENT_SLAVE_STOP_DETECTED));  //有这句卡这句
//Clear I2C2 STOPF flag: read operation to I2C_SR1 followed by a write operation to I2C_CR1
(void)(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF));
I2C_Cmd(I2C1, ENABLE);
}

发表于 2012-6-19 19:16

这是主机端
void TRANSFER_Master(void)
{
   char res1;
   char res2;
   char res3;
   char res4;
   //while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); //有这句卡这句
   //I2C_AcknowledgeConfig(I2C1, ENABLE);
   I2C_GenerateSTART(I2C1,ENABLE);
   while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT));
   I2C_Send7bitAddress(I2C1,ADDR_SLAVE1,I2C_Direction_Receiver);
   while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

   while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED));
   res1 = I2C_ReceiveData (I2C1);
   while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED));
   res2 = I2C_ReceiveData (I2C1);
   while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED));
   res3 = I2C_ReceiveData (I2C1);

   I2C_AcknowledgeConfig(I2C1, DISABLE);
   I2C_GenerateSTOP(I2C1,ENABLE);

   while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED));
   res4 = I2C_ReceiveData (I2C1);
   I2C_AcknowledgeConfig(I2C1, ENABLE);
}