HID Hi-O iCLASS Installation Guide - Manual (Page 30)

iCLASS OEM75 Integration Guide, 3141-907, Rev. B.0
Page 30 of 49 January 2014
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// Send the WRITE SPI byte.
sendSpiByte(SPI_WRITE, &returnByte);
// Send the number of bytes in this transfer.
sendSpiByte(numBytes, &returnByte);
// Send the data.
for (cnt=0; cnt
{
sendSpiByte(pData[cnt], &returnByte);
}
// De-Select the SPI slave device.
OEM75_SS = 1;
}
/***********************************************************************
** NAME:
** ReadSpi
**
** INPUTS:
** None
**
** OUTPUTS:
** pData - points to location to store incoming message data
** pNumBytes – points to location to store number of bytes in the message
**
** RETURN:
** None
**
** DESCRIPTION:
** This function receives a message from a slave SPI.
**
** NOTES:
**
***********************************************************************/
void ReadSpi(UBYTE *pData, UBYTE *pNumBytes)
{
UBYTE cnt;
// Select the SPI slave device.
OEM75_SS = 0;
// Send the Read command.
sendSpiByte(SPI_READ, pNumBytes);
// Send a dummy data byte and store the number of
// available bytes that is returned.
sendSpiByte(SPI_READ, pNumBytes);
for (cnt=0; cnt<=*pNumBytes; cnt++)
{
sendSpiByte(0, &pData[cnt]);
}
// De-Select the SPI slave devices.
OEM75_SS = 1;