working example of rising edge led toggle on pin A1

main.c

@@ -9,16 +9,16 @@
 #include "stm32f042x6.h"
 #include "hardwareDescription.h"
 
+volatile uint8_t led_on;
+
 void setup();
 
-void EXTI1_IRQHandler(void)
+void EXTI0_1_IRQHandler(void)
 {
-	if((EXTI->PR & EXTI_PR_PIF1) != 0) {
-		
-		pinToggle(pinB3);
-		
+	if(EXTI->PR & EXTI_PR_PIF1) {
 		// clear flag
 		EXTI->PR |= EXTI_PR_PIF1;
+		led_on = !led_on;
 	}
 }
 
@@ -28,27 +28,30 @@ int main(int argc, char *argv[])
 
 	// https://controllerstech.com/external-interrupt-using-registers/
 		
-	pinConfig(pinA1, input, def_stage, pullUp, def_speed);
-	// enable interrupt
-	//NVIC_EnableIRQ(EXTI0_1_IRQn);
-	
+	pinConfig(pinA1, input, def_stage, pullDown, def_speed);
 
 	// Connect
-	RCC->APB2ENR |= RCC_APB2ENR_SYSCFGCOMPEN;
-	SYSCFG->EXTICR[0] &= ~SYSCFG_EXTICR1_EXTI0;
-	SYSCFG->EXTICR[0] |= SYSCFG_EXTICR1_EXTI0_PA;
-
-	// rising trigger selection
-	EXTI->RTSR |= EXTI_RTSR_RT1;
+	RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
+	SYSCFG->EXTICR[1] &= ~SYSCFG_EXTICR1_EXTI1_Msk;
+	SYSCFG->EXTICR[1] |= SYSCFG_EXTICR1_EXTI1_PA;
 
 	// Interrupt mask register
 	EXTI->IMR |= EXTI_IMR_IM1;
 	
+	// rising trigger selection
+	EXTI->RTSR |= EXTI_RTSR_RT1;
 	
-	NVIC_SetPriority (EXTI1__IRQn, 1);	
-	NVIC_EnableIRQ(EXTI1);	
+	NVIC_SetPriority (EXTI0_1_IRQn, 0);	
+	NVIC_EnableIRQ(EXTI0_1_IRQn);	
 
-	while(1);
+	while(1)
+	{
+		if(led_on){
+			pinWrite(pinB3,1);
+		} else{
+			pinWrite(pinB3,0);
+		}
+	}
 /*
 	while(1)
 	{