/* p11_6.c Dead time creation with TIM8 PWM
 *
 * In this program, TIM8 Ch1 and Ch1N are configured as complementary
 * outputs of the center-aligned PWM. The output of Ch1 is PC6 and
 * the output of Ch1N is PA5.
 * To exaggerate the dead time, the dead time clock is set to four
 * times the timer counter clock in TIM8_CR1 and the dead time value
 * is set to maximum in TIM8_BDTR.
 *
 * This program was tested with Keil uVision v5.24a with DFP v2.11.0
 */
#include "stm32f4xx.h"

int main(void) {
    RCC->AHB1ENR |= 5;              /* enable GPIOA clock */
    
    GPIOC->AFR[0] |= 0x03000000;    /* set pin for tim8 Ch1 */
    GPIOC->MODER &= ~0x00003000;
    GPIOC->MODER |=  0x00002000;
    
    GPIOA->AFR[0] |= 0x00300000;    /* set pin for tim8 Ch1N */
    GPIOA->MODER &= ~0x00000C00;
GPIOA->MODER |=  0x00000800;
    
    /* setup TIM8 */
    RCC->APB2ENR |= 2;              /* enable TIM8 clock */
    TIM8->PSC = 16 - 1;             /* divided by 16 */
    TIM8->ARR = 1000;               /* divided by 1000 */
    TIM8->CNT = 0;
    TIM8->CCMR1 = 0x0060;
    TIM8->CCER = 5;                 /* enable PWM Ch1, Ch1N */
    TIM8->CCR1 = 500 - 1;           /* pulse width 500 */
    TIM8->BDTR |= 0x80FF;           /* enable output, set max dead time */
    TIM8->CR1 = 0x221;              /* slow DT clock, center-aligned, enable timer */

    while(1) {
    }
}