Solved
Complementary timer channels are not working in STM8S105.
Hi guys,
Recently I have started to do some practical test with STM8S105. While trying to implement PWM of TIM1 CH1 and CH2 with their complementary channels, it is seen that PWM pulses are generated only on main channels. Complementary channels are silent. Please see the code and suggest the way out.
#include "stm8s.h"
void setup_clock(void) {
CLK->ICKR |= CLK_ICKR_HSIEN; // Enable HSI
while (!(CLK->ICKR & CLK_ICKR_HSIRDY));
CLK->CKDIVR = 0x00;
CLK->SWR = 0xE1;
}
void setup_gpio(void) {
GPIOC->DDR |= (GPIO_PIN_1 | GPIO_PIN_2);
GPIOC->CR1 |= (GPIO_PIN_1 | GPIO_PIN_2);
GPIOC->CR2 |= (GPIO_PIN_1 | GPIO_PIN_2);
GPIOB->DDR |= (GPIO_PIN_0 | GPIO_PIN_1);
GPIOB->CR1 |= (GPIO_PIN_0 | GPIO_PIN_1);
GPIOB->CR2 |= (GPIO_PIN_0 | GPIO_PIN_1);
}
void setup_tim1_complementary_pwm(void) {
TIM1->CR1 &= ~TIM1_CR1_CEN;
CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER1, ENABLE);
TIM1->PSCRH = 0x00;
TIM1->PSCRL = 0x00;
TIM1->ARRH = 639 >> 8;
TIM1->ARRL = 639 & 0xFF;
TIM1->CCR1H = 100 >> 8;
TIM1->CCR1L = 100 & 0xFF;
TIM1->CCMR1 = 0x68;
TIM1->CCMR1 |= 1<<3;
TIM1->CCER1 |= TIM1_CCER1_CC1E;
TIM1->CCER1 |= TIM1_CCER1_CC1NE;
TIM1->CCR2H = 300 >> 8;
TIM1->CCR2L = 300 & 0xFF;
TIM1->CCMR2 = 0x68;
TIM1->CCMR2 |= 1<<3;
TIM1->CCER1 |= TIM1_CCER1_CC2E;
TIM1->CCER1 |= TIM1_CCER1_CC2NE;
TIM1->DTR = 0x10;
TIM1->BKR |= TIM1_BKR_MOE;
TIM1->EGR |= TIM1_EGR_UG;
TIM1->CR1 |= TIM1_CR1_CEN;
}
void main(void) {
setup_clock();
setup_gpio();
setup_tim1_complementary_pwm();
while(1) {
}
}
#ifdef USE_FULL_ASSERT
void assert_failed(uint8_t* file, uint32_t line)
{
while (1)
{
}
}
#endif