S3C6410 windows CE 6.0 IIC驱动的读操作的疑惑

[dairyman000]

IIC驱动中的读操作如下：

BOOL HW_Read (PHW_OPEN_INFO pOpenContext, PIIC_IO_DESC pInData ,PIIC_IO_DESC pOutData)
{
BOOL retVal = TRUE; // Initialize to success
RETAILMSG (MSG_FUNCTION,
(TEXT("+HW_Read(0x%X)\r\n"),
pOpenContext));

HW_SetRegister(pOpenContext);
HW_Write(pOpenContext, pInData);

ResetEvent(g_hTransferDone);
// Wait until IIC bus is free.
if(!WaitForReg((PVOID)&(g_pIICReg->IICSTAT), (1<<5), 0x0, TIMEOUT_MS_RX))
{
RETAILMSG(MSG_ERROR,(TEXT("[IIC ERROR]IIS BUS is busy.\r\n")));
return FALSE;
}
g_pcIIC_BUFFER = pOutData->Data;
g_uIIC_PT = 0;
g_uIIC_DATALEN = pOutData->Count;

g_pIICReg->IICCON |= (1<<7); // Ack generation Enable

//为什么是pInData->SlaveAddress 而不是pOutData->SlaveAddress.
//pOutData->SlaveAddress.才是读地址，即最后一位是 ‘1’ 而不是 ‘0’
g_pIICReg->IICDS = pInData->SlaveAddress;

g_pIICReg->IICSTAT = 0xB0;

if(WaitForSingleObject(g_hTransferDone, TIMEOUT_MS_RX) == WAIT_TIMEOUT)
{
RETAILMSG(MSG_ERROR,(TEXT("[IIC ERROR]RX Time out.\r\n")));
// TODO: Stop all transmit. ?? set register to stop
retVal = FALSE;
}

RETAILMSG (MSG_FUNCTION,
(TEXT("-HW_Read(0x%X)\r\n"),
pOpenContext));
return retVal;
}

实在费解啊

[凉拌菜]

g_pIICReg->IICDS = pInData->SlaveAddress与pOutData->SlaveAddress效果是一样的，在读操作时当你设置 g_pIICReg->IICSTAT = 0xB0;后硬件会自动SlaveAddress|0x1;