lucalizaranzu/Shmingo-HAL
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Finished Timer IRQ abstraction

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This commit is contained in:
Luca Lizaranzu
2025-08-28 20:56:51 -07:00
parent 55ca8d5360
commit 1e966f0688
6 changed files with 46 additions and 34 deletions
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33
Core/Src/main.cpp
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@@ -1,16 +1,6 @@
#include "SHAL.h"
#include "stm32f0xx.h"
volatile int prev_button = false;
volatile int curr_button = false;
extern "C" void TIM2_IRQHandler(void){
if(TIM2->SR & TIM_SR_UIF){
TIM2->SR &= ~TIM_SR_UIF;
GPIOA->ODR ^= (1 << 4);
}
}
extern "C" void EXTI0_1_IRQHandler(void) {
if (EXTI->PR & (1 << 0)) { //Check pending flag
EXTI->PR |= (1 << 0); //Clear it by writing 1
@@ -18,16 +8,24 @@ extern "C" void EXTI0_1_IRQHandler(void) {
}
}
void tim2Handler(){
GPIOA->ODR ^= (1 << 4);
}
int main() {
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
RCC->AHBENR |= RCC_AHBENR_GPIOBEN;
RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
auto timer2 = Timer(Timer_Key::S_TIM2);
timer2.setPrescaler(8000 - 1);
timer2.setARR(250 - 1);
timer2.setCallbackFunc(tim2Handler);
timer2.start();
RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN; // Enable SYSCFG clock (needed for EXTI)
TIM2->EGR |= TIM_EGR_UG; //Force update to load PSC/ARR
GPIOA->MODER &= ~(0b11 << (4 * 2));
GPIOA->MODER |= (0b1 << (4 * 2));
@@ -37,21 +35,12 @@ int main() {
GPIOB->MODER &= ~(0x3 << (0 * 2));
GPIOB->MODER |= (0x0 << (0 * 2));
TIM2->PSC = 8000 - 1; //8MHz base, prescaler
TIM2->ARR = 500 - 1; //500ms, auto reload register
SYSCFG->EXTICR[0] &= ~SYSCFG_EXTICR1_EXTI0; // Clear EXTI0 mapping
SYSCFG->EXTICR[0] |= SYSCFG_EXTICR1_EXTI0_PB; // Map PA0 -> EXTI0
EXTI->IMR |= (1 << 0); // Unmask EXTI0
EXTI->RTSR |= (1 << 0); // Trigger on rising edge
TIM2->DIER |= TIM_DIER_UIE; //Interrupt register
TIM2->CR1 |= TIM_CR1_CEN; //Counter enable
NVIC_EnableIRQ(TIM2_IRQn);
NVIC_EnableIRQ(EXTI0_1_IRQn); // EXTI lines 0 and 1 share an IRQ vector
__enable_irq();