2 digit counter display

1 files changed, 29 insertions, 7 deletions

diff --git a/src/main.c b/src/main.c
index 540f14c..c1dc647 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,29 +1,51 @@
 #include <avr/io.h>
+#include <stdint.h>
 #include <util/delay.h>
 
 // a b c d e f g decimal
 // Reversed because a-g is mapped to pa0-6. (pa7 is decimal)
 // Complemented because display is common anode
-const long digits[] = {
+const uint32_t digits[] = {
     0b01000000, 0b01111001, 0b00100100, 0b00110000, 0b00011001,
     0b00010010, 0b00000010, 0b01111000, 0b00000000, 0b00010000,
 };
 
-void write_digit(int digit) {
+void write_digit(uint8_t digit) {
   if (digit > 9 || digit < 0)
     return;
-
   PORTA = digits[digit];
 }
 
+void write_time(uint16_t hour, uint16_t minute) {
+  uint8_t minute_digit1 = minute % 10;
+  uint8_t minute_digit2 = minute / 10;
+  // unsigned short hour_digit1 = hour % 10;
+  // unsigned short hour_digit2 = hour / 10;
+
+#ifdef STUBBED
+  printf("\r:: %d %d", minute_digit2, minute_digit1);
+  fflush(stdout);
+#endif
+
+  write_digit(minute_digit1);
+  PORTA |= (1 << PA7);
+  _delay_ms(10);
+  PORTA &= ~(1 << PA7);
+
+  write_digit(minute_digit2);
+  PORTB |= (1 << PB2);
+  _delay_ms(10);
+  PORTB &= ~(1 << PB2);
+}
+
 int main(void) {
   DDRA |= 0b11111111;
+  DDRB |= (1 << PB2);
 
-  int i = 0;
+  uint32_t i = 0;
   while (1) {
-    write_digit(i);
-    _delay_ms(500);
-    i = (i + 1) % 10;
+    write_time(0, (i / 20) % 60);
+    i = (i + 1) % 100000;
   }
   return 0;
 }