int SPI1_transfer( int data)
{
LATBbits.LATB0 = 0; // set pin RB0 low / disable latch
while (TxBufFullSPI1()); // ensure buffer is free before writing
WriteSPI1(data); // send the data through SPI
while (SPI1STATbits.SPIBUSY); // blocking wait for end of transaction
LATBbits.LATB0 = 1; // set pin RB0 high / enable latch
}
//instead of writing SPI code repeatedly, made a function.
//Used various chip selects on the same channel to change
//values of various different digital potentiometers
void deliverSPICh1Datum(int datum){
// test for ready
while (TxBufFullSPI1());
// write to spi2
WriteSPI1(Digipot_config_chan_A | datum);
// test for done
while (SPI1STATbits.SPIBUSY); // wait for end of transaction
// CS high
// mPORTBSetBits(BIT_4); // end transaction
}
