# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1410234568 -10800
# Node ID 872e425f0e7f7102fffa9ed36b373899f3067f84
# Parent  9db99968b55e6986cfd0d4beb22cb9b0a538b893
foo

diff -r 9db99968b55e -r 872e425f0e7f avrgame.c
--- a/avrgame.c	Tue Sep 09 04:40:47 2014 +0300
+++ b/avrgame.c	Tue Sep 09 06:49:28 2014 +0300
@@ -1,4 +1,5 @@
 #include <avr/io.h>
+#include <avr/interrupt.h>
 #include <util/delay.h>
 #include "dotmatrix.h"
 
@@ -9,26 +10,71 @@
  *   - B3: DC
  *   - B4: CE
  *   - B5: RST
+ * - Port C[0,3]: buttons
  */
 
+enum {
+	BN_LEFT,
+	BN_RIGHT,
+	BN_ROT,
+	BN_DROP
+};
+
+void redraw(void);
 /*int lcd_stream_write(char c, FILE *fp);*/
+/*FILE stream_lcd = FDEV_SETUP_STREAM(lcd_stream_write, NULL, _FDEV_SETUP_WRITE);*/
 
-/*FILE stream_lcd = FDEV_SETUP_STREAM(lcd_stream_write, NULL, _FDEV_SETUP_WRITE);*/
+static int bx, by, brot;
+static unsigned char fb[DM_WIDTH * DM_HEIGHT / 8];
 
 int main(void)
 {
 	/* stdout = stderr = &stream_lcd; */
+	DDRC = 0;	/* input */
+	PORTC = 0;	/* disable pull-ups */
+
+	/* enable pin change interrupts (PCINT2) */
+	PCICR = (1 << PCIE2);
+	/* unmask interrupts PCINT16-19 (first 4 bits) */
+	PCMSK2 = 0xf;
 
 	dm_init();
-	dm_test();
+
+	sei();
 
 	for(;;) {
-		_delay_ms(800);
+		redraw();
 	}
 
 	return 0;
 }
 
+void redraw(void)
+{
+}
+
+ISR(PCINT2_vect)
+{
+	static unsigned char prev_st = 0xff;
+	unsigned char st = PINC;
+	unsigned char diff = st ^ prev_st;
+
+	if((diff & (1 << BN_LEFT)) & ~st) {
+		bx -= 1;
+	}
+	if((diff & (1 << BN_RIGHT)) & ~st) {
+		bx += 1;
+	}
+	if((diff & (1 << BN_ROT)) & ~st) {
+		brot = (brot + 1) % 4;
+	}
+	if((diff & (1 << BN_DROP)) & ~st) {
+		/* TODO */
+	}
+
+	prev_st = st;
+}
+
 #if 0
 int lcd_stream_write(char c, FILE *fp)
 {