I2C的主模式下的问题

2万 · 2013-4-11 19:44

uint8 I2C_MasterWriteBuf(uint8 slaveAddr, uint8 * xferData, uint8 cnt,uint8 mode)
{
   uint8 tmr;
   uint8 errStatus = I2C_MSTR_NO_ERROR;
   /* Determine whether or not to automatically generate a stop condition */
   if(mode & I2C_MODE_NO_STOP)
   {
      /* Do not generate a Stop at the end of transfer */
      I2C_mstrControl |= I2C_MSTR_NO_STOP;
   }
   else  /* Generate a Stop */
   {
      I2C_mstrControl &= ~I2C_MSTR_NO_STOP;
   }
   if((I2C_State == I2C_SM_IDLE) || (I2C_State == I2C_SM_MSTR_HALT))
   {
      errStatus = I2C_MSTR_BUS_TIMEOUT;
      if(I2C_State != I2C_SM_MSTR_HALT)
      {
         for(tmr = I2C_MSTR_TIMEOUT; tmr > 0; tmr--)
         {
               if((I2C_MCSR & I2C_MCSR_BUS_BUSY) == 0)
               {
                  errStatus = I2C_MSTR_NO_ERROR;
                  break;
               }
               CyDelay(1); /* Wait 1 mSec */
         }
      }
      else /* Bus halted waiting for restart */
      {
         errStatus = I2C_MSTR_NO_ERROR;
         I2C_mstrStatus &= ~I2C_MSTAT_XFER_HALT;
         CyIntClearPending(I2C_ISR_NUMBER);
      }
      /* If no timeout error, generate start */
      if(errStatus == I2C_MSTR_NO_ERROR)
      {
         slaveAddr = (slaveAddr << 1);
         I2C_State = I2C_SM_MSTR_WR_ADDR;
         I2C_mstrWrBufPtr = xferData; /* Set buffer pointer */
         I2C_mstrWrBufIndex = 0u;    /* Start buffer at zero */
         I2C_mstrWrBufSize  = cnt;    /* Set buffer size */
         I2C_DATA = slaveAddr;          /* Write address to data reg */
         /* Generate a Start or ReStart depending on flag passed */
         if(mode & I2C_MODE_REPEAT_START)
         {
               I2C_MCSR = I2C_MCSR_RESTART_GEN;  /* Generate a ReStart */
         }
         else
         {
               I2C_MCSR = I2C_MCSR_START_GEN;  /* Generate a Start */
         }
         CyIntEnable(I2C_ISR_NUMBER); /* IRQ must be enabled for this to work */
         /* Clear write complete flag */
         I2C_mstrStatus &= ~I2C_MSTAT_WR_CMPLT;
      }
   }
   else
   {
      errStatus = I2C_MSTR_SLAVE_BUSY;
   }
   return(errStatus);
}

在I2C的主模式下，只有一个Slave地址，还一个REG_Addr在哪呢？

2万 · 2013-4-11 19:45

这个是函数的功能！！
/*******************************************************************************
* Function Name: I2C_MasterWriteBuf
********************************************************************************
* Summary:
*  This function initiates a write transaction with an addressed slave.  Writes
*  one or more bytes (cnt) to the slave I2C device and gets the data from RAM
*  or ROM array pointed to by the array pointer.  Once this routine is called,
*  the included ISR will handle further data in byte by byte mode.
*
*
* Parameters:
*  slaveAddr: 7-bit slave address
*  xferData:  Pointer to data in array.
*  cnt:    Count of data to write.
*  mode:    Mode of operation.  It defines normal start, restart,
*          stop, no-stop, etc.
*
* Return:
*  void
*
* Theory:
*
* Side Effects:
*
*  //:TODO  incorporate mode
*******************************************************************************/