Move source code to firmware directory

firmware/rtc.c

@@ -0,0 +1,37 @@
+#include <avr/io.h>
+#include "rtc.h"
+#include "i2c.h"
+
+void rtc_int0_init(void)
+{
+  INT0_DIR &= ~(1<<INT0_PIN);
+  INT0_PORT |= (1<<INT0_PIN);
+  GICR |= (1<<INT0);
+}
+
+void rtc_int1_init(void)
+{
+  INT1_DIR &= ~(1<<INT1_PIN);
+  INT1_PORT |= (1<<INT1_PIN);
+  GICR |= (1<<INT1);
+}
+
+void rtc_set_time(uint8_t part, uint8_t value) 
+{  
+  uint8_t bcd = DEC_2_BCD(value);
+  i2c_writebuf(RTC_I2C_ADDR, part, 1, &bcd);
+}
+
+struct time rtc_read_time(void) 
+{
+  uint8_t buffer[3];
+  i2c_readbuf(RTC_I2C_ADDR, 0x02, 3, buffer);
+
+  struct time curr_time = {
+    BCD_2_DEC(buffer[2]),
+    BCD_2_DEC(buffer[1]),
+    BCD_2_DEC(buffer[0])
+  };
+
+  return curr_time;
+}