HID Hi-O iCLASS Installation Guide - Manual (Page 31)

iCLASS OEM75 Integration Guide, 3141-907, Rev. B.0
January 2014 Page 31 of 49
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}
/**********************************************************************/
/************************** Private Functions ************************/
/**********************************************************************/
/***********************************************************************
** NAME:
** sendSpiByte
**
** INPUTS:
** dataOut - the byte to send
**
** OUTPUTS:
** pDataIn - points to the location to store the returned data byte.
**
** RETURN:
** None
**
** DESCRIPTION:
** This function assumes the SPI slave select pin is already driven low.
**
** NOTES: This is code for a Microchip PIC18F2520. This code will
** be different for other SPI drivers on other processors.
**
***********************************************************************/
static void sendSpiByte(UBYTE dataOut, UBYTE *pDataIn)
{
// Send the byte.
SSPBUF = dataOut;
while (0 == (SSPSTAT & BIT_0)) ; // wait for transmission to complete
// Read the byte returned by the slave SPI device.
*pDataIn = SSPBUF; // Clears BF
// Delay a short time to allow the slave device to act.
DelayuS(SPI_DELAY);
}