Solved
STM32F401xB/C output a PWM signal on pin B14
So, the issue is as follows, according to datasheet the timer for pin B14 AF1, which is the PWM signal I believe, is the TIM1_CH2N. I have gone out of my way to try and output something, I just can't seem to understand what the problem is
#define AF01 0x01
void ms_delay(int ms) {
while (ms-- > 0) {
volatile int x = 500;
while(x-- > 0)
__asm("nop");
}
}
void setup() {
RCC->AHB1ENR |= 1<<1; //Enable clock for GPIOB
RCC->APB2ENR |= 1<<0; //Enable clock for TIM1
GPIOB->MODER |= 1<<29; //Set pin B14 to alternate function
GPIOB->MODER &= ~(1<<28);
GPIOB->MODER |= 1<<0;
GPIOB->OTYPER &= ~(1<<0);
GPIOB->AFR[1] |= AF01<<24; //Set the alternate function register for pin 14 to 0001
TIM1->PSC=0;
TIM1->ARR=255;
TIM1->CNT=0;
TIM1->CCMR1 |= (1<<13)|(1<<14); //Set channel 2 to pwm mode 1
TIM1->CCER |= 1<<4; //Enable channel 2
TIM1->CCER |= 1<<6; //Enable channel 2N ??
TIM1->CR1 |= 1<<0; // Counter enable for TIM1
TIM1->BDTR |= 1<<15;
TIM1->CCR2 = 5;
GPIOB->ODR |= 1;
}
void loop() {
ms_delay(3000);
}I am coding by putting value directly into registers sorry if this is less than readable, I can't use HAL or any other library, any help is much appreciated
