// Analog Output routine
//
void SetDAC(uint_16 setting, uint_8 channel)
{
	// Local Variable
	uint_16 dacout = 0;		// DAC Data, 16 bit.
	
	// Constant value for DAC Control nibble.
//	uint_16 dac1_Control = 0x1000; // Select DAC A, unbuffered, Gain = 2, Active.
	uint_16 dac1_Control = 0x3000; // Select DAC A, unbuffered, Gain = 1, Active.
//	uint_16 dac1_Control = 0x5000; // Select DAC A, buffered, Gain = 2, Active.
//	uint_16 dac1_Control = 0x7000; // Select DAC A, buffered, Gain = 1, Active.
	uint_16 dac1_Disable = 0x0000; // Select DAC A, Disable.
//	uint_16 dac2_Control = 0x9000; // Select DAC B, unbuffered, Gain = 2, Active.
	uint_16 dac2_Control = 0xB000; // Select DAC B, unbuffered, Gain = 1, Active.
//	uint_16 dac2_Control = 0x9000; // Select DAC B, buffered, Gain = 2, Active.
//	uint_16 dac2_Control = 0xF000; // Select DAC B, buffered, Gain = 1, Active.
	uint_16 dac2_Disable = 0x8000; // Select DAC B, Disable.

	// Insert the control nibble,  override if setting is shutdown command.
	// Note: for shutdown command use setting value of 0xFFFF.
	if (channel == 1) dacout = setting | dac1_Control;
	if ((channel == 1) & (setting == 0xFFFF) ) dacout = dac1_Disable;
	if (channel == 2) dacout = setting | dac2_Control;
	if ((channel == 2) & (setting == 0xFFFF) ) dacout = dac2_Disable;
	
	// Open the port. Third parameter is speed setting (SPBRG clock div).
	// For fOSC = 40MHz.
	// 10 = 1MHz
	// 24 = 420KHz
	// 32 = 310KHz
	SpiChnOpen(SPI_CHANNEL1, SPI_OPEN_MSTEN | SPI_OPEN_CKE_REV | SPI_OPEN_MODE16, 10);
	DACCS = 0;					// Select the DAC Chip.
	SpiChnWriteC(SPI_CHANNEL1, dacout);	// Send dat to DAC.
	while( SPI1STATbits.SPIBUSY );	// Wait for busy flag to clear.
//	for(i=0; i<200; i++);			// perform a delay, stretch CS @ 156KHz.
//	for(i=0; i<100; i++);			// perform a delay, stretch CS @ 310KHz.
	for(i=0; i<20; i++);			// perform a delay, stretch CS @ 1MHz.	
	DACCS = 1;						// Deselect the DAC Chip.
//	for(i=0; i<120; i++);			// perform a delay, LD setup time @ 156KHz
//	for(i=0; i<60; i++);			// perform a delay, LD setup time @ 310KHz.
	for(i=0; i<2; i++);				// perform a delay, LD setup time @ 1MHz.		
	DACLD = 0;						// Load new DAC Data to Output.
//	for(i=0; i<120; i++);			// perform a delay, strech LD @ 156KHz
//	for(i=0; i<60; i++);			// perform a delay, strech LD @ 310KHz.
	for(i=0; i<6; i++);			// perform a delay, strech LD @ 1MHz.
	DACLD = 1;						// Reset the Load pin.
//	for(i=0; i<40; i++);			// perform a delay.	
	SpiChnClose(SPI_CHANNEL1);		// Close the SPI.
}