webradio/firmware/main.c

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "oled-display/lcd.h"
#include "input.h"
#include "systick.h"

#define PORT_SPI(t) t##B
#define PIN_SPI_CS (1 << 2)

int dbg = 0;

void spi_init()
{
	SPCR = (1 << SPE);
	SPSR = (1 << SPI2X);
	DDRB |= (1 << 4);
}

#define Y_MAX (DISPLAY_HEIGHT / 8 - 1)
uint8_t spi_proc()
{
	static uint8_t new_data = 0;
	static uint8_t x = 0;
	static uint8_t y = Y_MAX;
	uint8_t spi_cs;
	static uint8_t spdr_next = 0;

	spi_cs = !(PORT_SPI(PIN) & PIN_SPI_CS);

	if (spi_cs) {
		if (SPSR & (1 << SPIF)) {
			SPDR = spdr_next;
			switch (y) {
			case Y_MAX:
				spdr_next = 55; // TODO: Vbat
				break;
			}
			lcd_set_buffer(x, y, SPDR);
			if (y == 0) {
				y = Y_MAX;
				x++;
				if (x == DISPLAY_WIDTH) {
					x = 0;
					new_data = 1; // Only update the display if a full frame was received
				}
			} else {
				y--;
			}
		}
	} else {
		if (new_data) {
			lcd_display();
			new_data = 0;
		} else if ((y == Y_MAX - 3) && (x == 0)) { // If the last one was a I/O frame
			input_clear_events();
		}
		x = 0;
		y = Y_MAX;
		SPDR = get_switch_event();
		spdr_next = get_rotary_delta();
	}

	return spi_cs;
}

void lcd_startup()
{
	lcd_init(LCD_DISP_ON);
	lcd_gotoxy(0, 0);
	lcd_puts_p(PSTR("== Internet Radio =="));
	lcd_drawLine(0, 9, 120, 9, WHITE);
	lcd_gotoxy(0, 2);
	lcd_puts_p(PSTR("Starting up."));
	lcd_gotoxy(0, 3);
	lcd_puts_p(PSTR("Please wait..."));
	lcd_display();
}

int main()
{
	cli();

	lcd_startup();
	spi_init();
	systick_init();
	input_init();

	_delay_ms(10);

	while (1) {
		if (!spi_proc()) {
			timer_proc();
			input_proc();
		}
	}
	return 0;
}