/* p11_6.c Dead time creation with TIM1 PWM
 *
 * In this program, TIM1 Ch1 and Ch1N are configured as complementary
 * outputs of the center-aligned PWM. The output of Ch1 is PA8 and
 * the output of Ch1N is PA7.
 * To exaggerate the dead time, the dead time clock is set to four
 * times the timer counter clock in TIM1_CR1 and the dead time value
 * is set to 16 times the dead time clock in TIM1_BDTR.
 *
 * This program was tested with Keil uVision v5.23 with DFP v2.0.0.
 */

#include "stm32f0xx.h"

int main(void) {
    RCC->AHBENR |= 0x00020000;      /* enable GPIOA clock */

    GPIOA->AFR[1] |= 0x00000002;    /* set pin for TIM1 Ch1 */
    GPIOA->MODER &= ~0x00030000;
    GPIOA->MODER |=  0x00020000;

    GPIOA->AFR[0] |= 0x20000000;    /* set pin for TIM1 Ch1N */
    GPIOA->MODER &= ~0x0000C000;
    GPIOA->MODER |=  0x00008000;

    /* setup TIM1 */
    RCC->APB2ENR |= 0x00000800;     /* enable TIM1 clock */
    TIM1->PSC = 8 - 1;              /* divided by 8 */
    TIM1->ARR = 1000;               /* divided by 1000 */
    TIM1->CNT = 0;
    TIM1->CCMR1 = 0x0060;
    TIM1->CCER = 5;                 /* enable PWM Ch1, Ch1N */
    TIM1->CCR1 = 500;               /* pulse width 500 */
    TIM1->BDTR = 0x80D0;            /* enable output, set dead time duration */
    TIM1->CR1 = 0x221;              /* slow DT clock, center-aligned, enable timer */

    while(1) {
    }
}