From dcbb63902e125a0ec7a6236c3e394b46058f12d7 Mon Sep 17 00:00:00 2001
From: Rutherther <rutherther@ditigal.xyz>
Date: Fri, 29 Nov 2024 12:20:41 +0100
Subject: [PATCH] feat(arm03): null timer while button is held

---
 arm03/src/main.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/arm03/src/main.c b/arm03/src/main.c
index 8a89353..a72e1f4 100644
--- a/arm03/src/main.c
+++ b/arm03/src/main.c
@@ -73,7 +73,10 @@ timer_t startstop_debounce_timer;
 
 exti_t startstop_exti;
 pin_t startstop_button;
-exti_t null_button;
+pin_t null_button;
+
+void null_timer(void);
+void toggle_timer(void);
 
 void main()
 {
@@ -94,14 +97,17 @@ void main()
   //  digit update frequency * digits * 34
   //  aim for 100 Hz * 4 * 17 = 6 800 Hz
 
-  exti_init(&null_button, 4, EXTI, SYSCFG);
-  exti_external_interrupt(&null_button, EXTI_GPIOA);
-  exti_rising_interrupt(&null_button);
-  exti_enable_interrupt(&null_button);
+  /* exti_init(&null_button, 4, EXTI, SYSCFG); */
+  /* exti_external_interrupt(&null_button, EXTI_GPIOA); */
+  /* exti_rising_interrupt(&null_button); */
+  /* exti_enable_interrupt(&null_button); */
+  pin_init(&null_button, GPIOA, 4);
+  pin_into_input(&null_button);
+  pin_speed(&null_button, LOW_SPEED);
 
   exti_init(&startstop_exti, 0, EXTI, SYSCFG);
   exti_external_interrupt(&startstop_exti, EXTI_GPIOB);
-  exti_rising_interrupt(&startstop_exti);
+  exti_falling_interrupt(&startstop_exti);
   exti_enable_interrupt(&startstop_exti);
 
   pin_init(&startstop_button, GPIOB, 0);
@@ -144,7 +150,12 @@ void main()
 
   // Application
   while (1) {
-    uint32_t count = timer_count(&stopwatch_timer) >> 2;
+    uint32_t count = 0;
+    if (!pin_read(&null_button)) {
+      null_timer();
+    } else {
+      count = timer_count(&stopwatch_timer) >> 2;
+    }
 
     display_enable_digit(&display, 0,
                          (count % display.max_value) >= 1000);
@@ -188,7 +199,7 @@ void TIM3_handler(void) {
 
 void TIM4_handler(void) {
   timer_clear_interrupt(&startstop_debounce_timer);
-  if (pin_read(&startstop_button)) {
+  if (!pin_read(&startstop_button)) {
     toggle_timer();
   }
 }
-- 
2.48.1