HID Hi-O iCLASS Installation Guide - Manual (Page 37)

iCLASS OEM75 Integration Guide, 3141-907, Rev. B.0
January 2014 Page 37 of 49
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for (cnt = 0; cnt < numBytes; cnt++)
{
if (I²C_NAK == writeByte(pData[cnt]))
{
cnt = numBytes; // end the loop
}
}
}
}
sendI2CStop();
}
/***********************************************************************
** NAME:
** ReadI2C
**
** INPUTS:
** None
**
** OUTPUTS:
** pData - points to the buffer to store the incoming message data
** pNumBytes - points to the location to store the number of bytes received
**
** RETURN:
** None
**
** DESCRIPTION:
** This function receives a byte of data from an external CPU or
** peripheral device.
**
** NOTES:
**
***********************************************************************/
void ReadI2C(UBYTE *pData, UBYTE *pNumBytes)
{
UBYTE cnt;
//
// Issue a bus start
//
sendI2CStart();
//
// Send device address with the read bit set.
//
if (I2C_NAK == writeByte(SLAVE_ADDR | 0x01))
{
return;
}
//
// Read the first byte in the message. This byte is
// the number of bytes that is to be received in the
// incoming message.
//