S3C2440 SPI接收问题请教

S3C2440 SPI接收问题请教, 程序代码如下所示. 2440通过SPI连接CAN芯片，通过SPI读取CAN芯片状态寄存器状态，示波器能够抓到MISO,MOSI，SCK的正确波形，说明数据发送和接收都是正确的，可就是2440寄存器SPRDAT0没有数值，始终是0. 各位大侠估计什么原因？

SPI_CtrlBlk.pSPIReg->SPTDAT0 = 0xaa;

RETAILMSG(1, (TEXT("SPI_Read send = 0x%x \\r\\n"), SPI_CtrlBlk.pSPIReg->SPTDAT0));

DWORD dwRet = WaitForSingleObject(SPI_CtrlBlk.hSPIEvent, SPI_RX_DELAY);

InterruptDone(SPI_CtrlBlk.SPI_Intr);

if (dwRet == WAIT_TIMEOUT)
{
RETAILMSG (1, (TEXT("- ")TEXT(__FUNCTION__)TEXT(" WAIT_TIMEOUT %d \\r\\n"),  GetLastError() ));
return 0;
}

recv = SPI_CtrlBlk.pSPIReg->SPRDAT0;

RETAILMSG(1, (TEXT("SPI_Read recv = 0x%x \\r\\n"), recv));