webradio/firmware/main.c

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

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

void spi_proc()
{
	static uint8_t spi_cs_last = 0;
	static uint8_t x = 0;
	static uint8_t y = DISPLAY_HEIGHT / 8 - 1;
	uint8_t spi_cs;
	
	spi_cs = !(PORT_SPI(PIN) & PIN_SPI_CS);
	
	if (spi_cs) {
		if (SPSR & (1 << SPIF)) {
			lcd_set_buffer(x, y, SPDR);
			if (y == 0) {
				y = DISPLAY_HEIGHT / 8 - 1;
				x++;
				if (x == DISPLAY_WIDTH)
					x = 0;
			} else {
				y--;
			}
		}
	} else {
		if (spi_cs_last) {
			lcd_display();
		}
		x = 0;
		y = DISPLAY_HEIGHT / 8 - 1;
	}
	
	spi_cs_last = spi_cs;
}

int main()
{	
	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();
	
	SPCR = (1 << SPE);
	
	_delay_ms(10);
	
	while (1) {
		spi_proc();
	}
	return 0;
}