spi.c

void doTransfer(void){
	unsigned char byte;
	int i;
	SPI1TCNTH = 0;
	SPI1TCNTL = 4;
	transferMode = 1;
	SPI1TXBbits.TXB = 0;
	while(PIR2bits.SPI1TXIF == 0);
	SPI1TXBbits.TXB = 0;
	while(PIR2bits.SPI1TXIF == 0);
	SPI1TXBbits.TXB = 0;
	while(PIR2bits.SPI1TXIF == 0);
	SPI1TXBbits.TXB = 0;
	while(PIR2bits.SPI1TXIF == 0);
	SPI1INTFbits.TCZIF = false;
	for(i = 0; i < pixelCount; i++){
		signed int toTransfer = (transferOffset + transfered) % pixelCount;
		SPI1TCNTL+= 4;
		SPI1TXBbits.TXB = 0b11100000 | transferBuffer[toTransfer].A;
		while(PIR2bits.SPI1TXIF == 0);
		SPI1TXBbits.TXB = transferBuffer[toTransfer].B;
		while(PIR2bits.SPI1TXIF == 0);
		SPI1TXBbits.TXB = transferBuffer[toTransfer].G;
		while(PIR2bits.SPI1TXIF == 0);
		SPI1TXBbits.TXB = transferBuffer[toTransfer].R;
		while(PIR2bits.SPI1TXIF == 0);
		transfered++;
	}
	transfered = 0;
	transferMode = 3;
	for(i = 0; i < pixelCount; i++){
		SPI1TCNTL+= 4;
		SPI1TXBbits.TXB = 0;
		while(PIR2bits.SPI1TXIF == 0);
		SPI1TXBbits.TXB = 0;
		while(PIR2bits.SPI1TXIF == 0);
		SPI1TXBbits.TXB = 0;
		while(PIR2bits.SPI1TXIF == 0);
		SPI1TXBbits.TXB = 0;
		while(PIR2bits.SPI1TXIF == 0);
		transfered++;
	}
	transferMode = 0;
}

static void initSPI(void){
	SPI1INTF = 0;
	SPI1INTE = 0;
	SPI1INTEbits.TCZIE = 1;
	
	SPI1CON0 = 0;
	SPI1CON0bits.BMODE = 1;
	SPI1CON0bits.MST = 1;
	SPI1CON0bits.LSBF = 0;
	
	SPI1CON1bits.SMP = 0;
	SPI1CON1bits.CKE = 1;
	SPI1CON1bits.CKP = 0;
	SPI1CON1bits.FST = 0;
	SPI1CON1bits.SSP = 0;
	SPI1CON1bits.SDIP = 0;
	SPI1CON1bits.SDOP = 0;
	
	SPI1CON2bits.BUSY = 0;
	SPI1CON2bits.SSFLT = 0;
	SPI1CON2bits.SSET = 0;
	SPI1CON2bits.TXR = 1;
	SPI1CON2bits.RXR = 0;
	SPI1TWIDTHbits.TWIDTH = 0;
	SPI1CLK = 0b00000000;
	SPI1BAUD = 10;
	SPI1CON0bits.EN = 1;
}