From f75283e440df24292d51b7b10f72a4d17c6302f0 Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Thu, 24 Mar 2022 15:19:31 +0100
Subject: interrupts working (finally)

---
 src/main.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

(limited to 'src')

diff --git a/src/main.c b/src/main.c
index 241f369..98de161 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,4 @@
-#ifdef __cplusplus
-extern "C" {
-#endif
-
+#include <stdbool.h>
 #include "stm32f091xc.h"
 
 // GPIO A
@@ -74,22 +71,20 @@ void shield_config() {
 	TIM3->CR1 |= TIM_CR1_CEN; // enable counter
 }
 
-
 void toggle_direction() {
 	led_direction = !led_direction;
 }
 
 void EXTI4_15_IRQHandler(void) {
-	// toggle_direction();
-	led_direction = !led_direction;
-	return;
+	toggle_direction();
+	EXTI->PR |= EXTI_PR_PIF8;
 }
 
 void interrupt_setup() {
 	RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
 	// RCC->APB2ENR |= RCC_APB2ENR_SYSCFGCOMPEN;
-	SYSCFG->EXTICR[PINOUT_BTN / 4] &= ~(0xF << ((PINOUT_BTN % 4) * 4));
-	SYSCFG->EXTICR[PINOUT_BTN / 4] |=  (0x1 << ((PINOUT_BTN % 4) * 4));
+	SYSCFG->EXTICR[2] &= ~(SYSCFG_EXTICR3_EXTI8_Msk);
+	SYSCFG->EXTICR[2] |=  (SYSCFG_EXTICR3_EXTI8_PB);
 
 	EXTI->IMR  |=  (1 << PINOUT_BTN);
 	EXTI->RTSR &= ~(1 << PINOUT_BTN);
@@ -146,7 +141,7 @@ void dumb_delay() {
  * It uses the channel 1 capture/compare register to check if the time (in
  * milliseconds) has expired. 
  */
-int timer_delay(unsigned short millis) {
+void timer_delay(unsigned short millis) {
 	TIM3->CCR1 = millis; // set delay amount
 	TIM3->CNT = 0; // reset timer
 	TIM3->SR &= ~(TIM_SR_CC1IF); // reset capture/compare output
@@ -157,6 +152,8 @@ int main() {
 	shield_config(); 
 	interrupt_setup();
 
+	// int test = 0;
+
 	while (1) {
 		// if ((TIM3->SR & TIM_SR_CC1IF) > 0) {
 		// 	toggle_direction();
@@ -166,9 +163,8 @@ int main() {
 		// }
 		timer_delay(100);
 		next_led();
-	}
-}
+		// test = (test + 1) % 5;
 
-#ifdef __cplusplus
+		// if (test == 0) toggle_direction();
+	}
 }
-#endif
-- 
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