新唐MINI51的I2C从设备问题

只看该作者 · 2014-4-16 17:27

我现在用MIN51做I2C的从设备，用中断来读主设备数据，参考了官网里面有个例程（I2C_Software_GPIO），但是原程序里面里面设了四个设备地址，我的设备地址是0xa0,要怎么设置啊？

   /* Set I2C 4 Slave Addresses */
I2C_SetSlaveAddr(I2C, 0, 0x15, 0); /* Slave Address : 0x15 */
I2C_SetSlaveAddr(I2C, 1, 0x35, 0); /* Slave Address : 0x35 */
I2C_SetSlaveAddr(I2C, 2, 0x55, 0); /* Slave Address : 0x55 */
I2C_SetSlaveAddr(I2C, 3, 0x75, 0); /* Slave Address : 0x75 */

请问为什么要设四个从设备地址啊？还有作为从设备难道也要设置时钟吗？
   /* Open I2C module and set bus clock */
I2C_Open(I2C, 120);

我现在怎么设置都进不了中断，各路高手请指点一下，急盼大侠回复。

下面是中断程序（例程没有改动）：
void I2C_IRQHandler(void)
{
uint32_t u32Status;

u32Status = I2C_GET_STATUS(I2C);

switch(u32Status)
{
      /* Slave Transmitter Mode */
      case 0xC0:                      /* DATA has been transmitted and NACK has been returned */
      case 0xC8:                      /* DATA has been transmitted and ACK has been returned */
         I2C_SET_CONTROL_REG(I2C, I2C_SI | I2C_AA);
         printf("Slave Transmitter Success\n");
         break;

      case 0xA8:                      /* SLA+R has been received and ACK has been returned */
      case 0xB0:
         DataLen = 0;
      case 0xB8:                      /* DATA has been transmitted and ACK has been returned */
         I2C_SET_DATA(I2C, Tx_Data[DataLen++]);
         if(DataLen<sizeof(Tx_Data))
            I2C_SET_CONTROL_REG(I2C, I2C_SI | I2C_AA);
         else
            I2C_SET_CONTROL_REG(I2C, I2C_SI);
         break;

      /* Slave Receiver Mode*/
      case 0x68:                      /* SLA+W has been received and ACK has been returned */
      case 0x60:
         DataLen = 0;
         Rx_Data[0] = 0;
         I2C_SET_CONTROL_REG(I2C, I2C_SI | I2C_AA);
         break;
      case 0x80:                      /* DATA has been received and ACK has been returned */
         Rx_Data[DataLen++] = I2C_GET_DATA(I2C);
         if(DataLen<(sizeof(Rx_Data)-1))
            I2C_SET_CONTROL_REG(I2C, I2C_SI | I2C_AA);
         else
            I2C_SET_CONTROL_REG(I2C, I2C_SI);
         break;
      case 0x88:                      /* DATA has been received and NACK has been returned */
         Rx_Data[DataLen++] = I2C_GET_DATA(I2C);
         I2C_SET_CONTROL_REG(I2C, I2C_SI | I2C_AA);
         break;

      case 0xA0:                   /* STOP or Repeat START has been received */
         I2C_SET_CONTROL_REG(I2C, I2C_SI | I2C_AA);
         printf("Slave Receiver Success\n");
         break;
}
}