#include "../config.h"
#include "../makros.h"

#include <avr/interrupt.h>
#include <avr/io.h>
#include <avr/wdt.h>

#include "borg_hw.h"


/*
 // those macros get defined via menuconfig, now

 #define ROWPORT PORTB
 #define ROWDDR DDRB

 #define COLPORT PORTD
 #define COLDDR DDRD

 #define PIN_DATA     PC4
 #define PIN_CLK      PC6 //active low
 #define PIN_LINE_EN  PC5 //active low

 */


#define COLDDR DDR(COLPORT)
#define ROWDDR DDR(ROWPORT)


unsigned char pixmap[NUMPLANE][NUM_ROWS][LINEBYTES];


inline void rowshow(unsigned char row, unsigned char plane) {
	COLPORT |= (1 << PIN_LINE_EN); //blank display

	ROWPORT = (ROWPORT & 0xF8) | row;

	unsigned char b, d, x;
	for (b = 0; b < LINEBYTES; b++) {
		d = pixmap[plane][row][b];
		for (x = 0; x < 8; x++) {
			if (d & 0x01) {
				COLPORT |= (1 << PIN_DATA);
			} else {
				COLPORT &= ~(1 << PIN_DATA);
			}
			d >>= 1;
			COLPORT &= ~(1 << PIN_CLK);
			COLPORT |= (1 << PIN_CLK);
		}
	}

	COLPORT &= ~(1 << PIN_LINE_EN); // unblank display
}


ISR(TIMER0_COMP_vect) {
	static unsigned char plane = 0;
	static unsigned char row = 0;

	if (row == 0) {
		switch (plane) {
		case 0:
			OCR0 = 7;
			break;
		case 1:
			OCR0 = 20;
			break;
		case 2:
			OCR0 = 40;
		}
	}

	rowshow(row, plane);

	if (++row == NUM_ROWS) {
		row = 0;
		if (++plane == NUMPLANE)
			plane = 0;
	}
	wdt_reset();
}


void timer0_on() {
	/* 	TCCR0: FOC0 WGM00 COM01 COM00 WGM01 CS02 CS01 CS00
	 CS02 CS01 CS00
	 0    0    0       stop
	 0    0    1       clk
	 0    1    0       clk/8
	 0    1    1       clk/64
	 1    0    0       clk/256
	 1    0    1       clk/1024

	 */
	TCCR0 = 0x08 | 0x04; // CTC Mode, clk/256
	TCNT0 = 0;           // reset timer
	OCR0  = 0x30;        // compare with this value
	TIMSK = 0x02;        // compare match Interrupt on
}


void timer0_off() {
	cli();

	COLPORT |= (1 << PIN_LINE_EN); //blank display

	TCCR0 = 0x00;
	sei();
}


void watchdog_enable() {
	wdt_reset();
	wdt_enable(0x00); // 17ms

}


void borg_hw_init() {
	COLPORT |= (1 << PIN_CLK) | (1 << PIN_LINE_EN);
	COLDDR |= (1 << PIN_CLK) | (1 << PIN_LINE_EN) | (1 << PIN_DATA);

	ROWDDR |= 0x07;

	watchdog_enable();
	timer0_on();
}