static void SdCardWaitReady(void)
{
if( QueryMessageStatus(SD_u32CurrentMsgToken) == COMPLETE )
{
if( *SD_pu8RxBufferParser != 0xFF )
{
SD_u32CurrentMsgToken = SspReadByte(SD_Ssp);
if( !SD_u32CurrentMsgToken )
{
/* We didn't get a return token, so abort */
SD_u8ErrorCode = SD_ERROR_NO_TOKEN;
SD_pfnStateMachine = SdError;
}
AdvanceSD_pu8RxBufferParser(1);
}
/* The card is ready for the command */
else
{
SD_u32CurrentMsgToken = SspWriteData(SD_Ssp, SD_CMD_SIZE, SD_NextCommand);
/* Pre-emptively move RxBufferParser so it will point to command response */
AdvanceSD_pu8RxBufferParser(SD_CMD_SIZE);
/* Set up time-outs and next state */
SD_u32Timeout = G_u32SystemTime1ms;
SD_pfnStateMachine = SdCardWaitCommand;
}
}
/* Watch for SSP timeout */
CheckTimeout(SD_SPI_WAIT_TIME_MS);
} /* end SdCardWaitReady() */
/*----------------------------------------------------------------------------------------------------------------------
Function: SspReadData
Description:
Gets multiple bytes from the slave on the target SSP peripheral.
Requires:
- psSspPeripheral_ has been requested and holds a valid pointer to a transmit buffer; even if a transmission is
in progress, the node in the buffer that is currently being sent will not be destroyed during this function.
- The chip select line of the SSP device should be asserted
- u32Size_ is the number of bytes in the data array
Promises:
- Adds a dummy byte message at psSspPeripheral_->pTransmitBuffer that will be sent by the SSP application
when it is available and thus clock in the received bytes to the designated Rx buffer.
- Returns the message token of the dummy message used to read data
*/
u32 SspReadData(SspPeripheralType* psSspPeripheral_, u32 u32Size_)
{
return( SspWriteData(psSspPeripheral_, u32Size_, &SSP_au8Dummies[0]) );
} /* end SspReadData() */
