1 files changed, 74 insertions, 0 deletions
diff --git a/src/mode.c b/src/mode.c
new file mode 100644
index 0000000..b6fad97
--- /dev/null
+++ b/src/mode.c
@@ -0,0 +1,74 @@
+#include <stdint.h>
+
+#include "mode.h"
+#include "rtc.h"
+
+enum Mode current_mode = ModeDisplayTime;
+volatile uint8_t new_minutes = 0;
+volatile uint8_t new_hours = 0;
+volatile uint8_t current_digit_index = 0;
+volatile uint16_t time_set_timeout_ticks = 0;
+
+void increment_digit() {
+  switch (current_digit_index) {
+  case 0:
+    new_hours = (new_hours + 10) % 24;
+    break;
+  case 1:
+    new_hours = (new_hours + 1) % 24;
+    break;
+  case 2:
+    new_minutes = (new_minutes + 10) % 60;
+    break;
+  case 3:
+    new_minutes = (new_minutes + 1) % 60;
+    break;
+  }
+}
+
+void apply_button_state(enum ButtonState button_state) {
+  switch (current_mode) {
+  case ModeDisplayTime:
+    switch (button_state) {
+    case ButtonLongPressed:
+      new_minutes = minutes;
+      new_hours = hours;
+      current_digit_index = 0;
+      current_mode = ModeSetTime;
+      break;
+    default:
+      break;
+    }
+    break;
+  case ModeSetTime:
+    if (button_state == ButtonIdle) {
+      time_set_timeout_ticks =
+          time_set_timeout_ticks == 0 ? 0 : time_set_timeout_ticks - 1;
+      if (time_set_timeout_ticks == 0) {
+        current_mode = ModeDisplayTime;
+        return;
+      }
+    } else {
+      time_set_timeout_ticks = 10 * 1024;
+    }
+
+    switch (button_state) {
+    case ButtonPressed:
+      increment_digit();
+      break;
+    case ButtonLongPressed:
+      if (current_digit_index == 3) {
+        rtc_set_minutes(new_minutes);
+        rtc_set_hours(new_hours);
+        current_mode = ModeDisplayTime;
+        current_digit_index = 0;
+      } else {
+        current_digit_index++;
+      }
+      break;
+    default:
+      break;
+    }
+    break;
+  }
+}