Digilent 410-216P-KIT - Manual (Page 14)

chipKIT Basic I/O Shield Reference Manual
www.digilentinc.com page 14 of 15
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Low Level SPI Functions
The following functions are used to write data to the display panel using the SPI controller.
/* ------------------------------------------------------------ */
/*** OledPutBuffer
**
**
Parameters:
** cb - number of bytes to send/receive
** rgbTx - pointer to the buffer to send
**
**
Return Value:
** none
**
**
Errors:
** none
**
**
Description:
** Send the bytes specified in rgbTx to the slave.
*/
void
OledPutBuffer(int cb, BYTE * rgbTx)
{
int ib;
BYTE bTmp;
/* Write/Read the data
*/
for (ib = 0; ib < cb; ib++) {
/* Wait for transmitter to be ready
*/
while (SPI2STATbits.SPITBE == 0);
/* Write the next transmit byte.
*/
SPI2BUF = *rgbTx++;
/* Wait for receive byte.
*/
while (SPI2STATbits.SPIRBF == 0);
bTmp = SPI2BUF;
}
}
/* ------------------------------------------------------------ */
/*** Spi2PutByte
**
**
Parameters:
** bVal - byte value to write
**
**
Return Value:
** Returns byte read
**
**
Errors:
** none
**
**
Description:
** Write/Read a byte on SPI port 2