STM32F303RE Tim2 ch2 PWM Mode

[Nick-]

Hi everyone, I'm trying to use the Timer2 CH2 PWM Mode 1 to generate a 1 Hz signal with 50% Duty Cycle out of my PA0 pin but i can't get anything. Here's my code:

#include"stm32f3xx.h"
 
void TIM_PWM(void);
 
int main(void){
	TIM_PWM();
while(1){
}
}
 
void TIM_PWM(void){
	RCC->AHBENR |= (1U<<17);   //AHBENR GPIOA
	RCC->APB1ENR |= (1U<<0);  //APB1ENR TIM2
	GPIOA->MODER |= (1U<<1);  //PA0 alternate function
	GPIOA->AFR[0] |= (1U<<0);   //alternate function AF1  on PA0
	TIM2->PSC = 8000;
	TIM2->ARR = 1000;
	TIM2->CNT = 0;
	TIM2->CCR2 = 500;    //capture compare CH2
	TIM2->CCMR1 |= (0b110<<12);    //capture compare PWM mode 1
	TIM2->CCER |= (1U<<4);   //capture compare CH2 output enable
	TIM2->CR1 = (1U<<0);    //counter enable
}

I'm using a NUCLEO BOARD STM32F303RE. Clock is set to 8 Mhz.

Can someone help me? thanks in advance

[TDK · Accepted solution]

> GPIOA->MODER |= (1U<<1); //PA0 alternate function

> TIM2->CCR2 = 500;

TIM2_CH2 is not on PA0 is, but TIM2_CH1 is.

Use CCR1 instead of CCR2.

Note that the period is (timer clock) / (PSC + 1) / (ARR + 1) so you don't quite have 50% duty cycle. Probably want PSC=7999, ARR=999, CCR1=500.

[Nick-]

I didn't notice that the CH was wrong. I fix the code and now it works as expected. Thank you very much!