/**********************************************************
;*  Exercise -  5 SYNCHRONOUS SERIAL EXPANSION VIA SPI BUS
;**********************************************************
; BEAU HOBBA 470213225
; BEC EGAN 470416594
;**********************************************************
*/


#include <p18f452.h>
#include "ConfigRegsPIC18F452.h"
#include <stdio.h>
#include <stdlib.h>
#include <spi.h>

void highPriorityISR(void);

// Config variables
unsigned char dataIn;

#pragma code high_vector = 0x08
void gotolowISR(void){
    _asm
     GOTO highPriorityISR
    _endasm
}



void initTimer(void){


	T1CON = 0b10100001;
	// bit 7- enables one 16 bit operation
	// bit 5-4- prescalar of 4
	// bit 0- enables timer 1

	// Compare mode with special event trigger
	CCP1CON = 0b00001011;

	// Clear all interrupts
	RCONbits.IPEN = 1;
	PIE1bits.CCP1IE = 1; // Set up the interrupt for timer 1
	PIR1bits.CCP1IF = 0; // Clear the interrupt flag

	INTCONbits.GIEH = 1;	// Enable low and high priority interrupts
	INTCONbits.GIEL = 1;

}

void outputClock(void) {

	// Set to 30Hz
	// (Fosc/4) /PS = x/Period
	// x = 4167
	CCPR1H = 0b00010000;
	CCPR1L = 0b01000111;


}

void portBInit(void){

	PORTB = 0; // Clear port B
	TRISB = 0; // Set Port B to output
	PORTBbits.RB2 = 0; // Set port B pin 2 to output the SH/LD (30Hz)
	PORTBbits.RB3 = 0; // Set port B pin 3 as output for RCLK (30Hz)
    PORTBbits.RB4 = 0; // Set port B pin 4 as SRCLR(not) // just set to high



}


void initSPI(void) {

	// Configure status register
	SSPSTATbits.SMP = 1; // Data sampled at the end // mid?
	SSPSTATbits.CKE = 0; // Data transmitted on falling edge while idling low (CKP = 0)

	// Configure control register
    SSPCON1 = 0b00100000;
	//SSPCON1bits.SSPEN = 1; 	// Synchronous serial port enable
	//SSPCON1bits.CKP = 0;	// Clock polarity select, idle low
	//SSPCON1bits.SSPM3:SSPM0 = 0000; // SPI master mode, clock = Fosc/4



}

//unsigned char receiveSPI(void) {
//
//	// Check if data is ready
//	//while (DataRdySPI() == 0){
//	//}
//
//	// Now that there is new data in SSPBUF, acquire a byte of data
//
//    return dataIn;
//
//}

void initTransmit(void){

	TRISC &= 0b00010000; // Set data direction pin for serial transmission
	//TRISC<3> = 0; // Serial clock Master Mode
}

//void transmitSPI(unsigned char){
//
//	// Transmit data but if collision bit set, do again
//	//putcSPI(dataIn);
//	/*if (SSPCON1bits.WCOL == 1){
//		SSPCON1bits.WCOL = 0;
//		transmitSPI(); // This is a bit shit: fix
//	}*/
//
//}





void main(void) {

    // NOTE: may need to set clk inh bit and clear for serial shift in 165

	//initSPI();
	initTimer();
	portBInit();
	outputClock();
    initTransmit();
    //receiveSPI();

	while(1);

}

#pragma code
#pragma interrupt highPriorityISR
void highPriorityISR(void){

	// Bit toggle port B pin 2
	PORTBbits.RB2 ^= 1;

    // Bit toggle port B pin 3
	PORTBbits.RB3 ^= 1;


    // Read data from 165 chip
    //while (DataRdySPI() == 0){
    //}
    dataIn = ReadSPI();

    // Write the data to the 595 chip
    //putcSPI(dataIn);

    // Clear the interrupt
	PIR1bits.CCP1IF = 0;


}