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Understanding General Purpose Timers

STM32F411-NUCLEO DELAY

#include "stm32f4xx.h"

int main(void) {
    // configure PA5 as output to drive the LED
    RCC->AHB1ENR |=  1;             
    GPIOA->MODER &= ~0x00000C00;    
    GPIOA->MODER |=  0x00000400;    
    
    // configure TIM2 to wrap around at 1 Hz
    RCC->APB1ENR |= 1;              /* enable TIM2 clock */
    TIM2->PSC = 1600 - 1;           /* divided by 1600 */
    TIM2->ARR = 10000 - 1;          /* divided by 10000 */
    TIM2->CNT = 0;                  /* clear timer counter */
    TIM2->CR1 = 1;                  /* enable TIM2 */

    while (1) {
        while(!(TIM2->SR & 1)) {}   /* wait until UIF set */
        TIM2->SR &= ~1;             /* clear UIF */
        GPIOA->ODR ^= 0x00000020;   /* toggle green LED */
    }
}

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