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minor WIP

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This commit is contained in:
Hierophect 2019-10-22 13:11:45 -04:00
parent ca4b7f81e5
commit 1d8a75fa3f
1 changed files with 23 additions and 0 deletions
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23
ports/stm32f4/common-hal/pulseio/PWMOut.c
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@ -44,6 +44,29 @@ pwmout_result_t common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
uint16_t duty,
uint32_t frequency,
bool variable_frequency) {
__HAL_RCC_TIM4_CLK_ENABLE();
TIM_HandleTypeDef tim = {0};
tim.Instance = TIM4;
tim.Init.Period = LED_PWM_TIM_PERIOD - 1;
tim.Init.Prescaler = timer_get_source_freq(pwm_cfg->tim_id) / 1000000 - 1; // TIM runs at 1MHz
tim.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
tim.Init.CounterMode = TIM_COUNTERMODE_UP;
tim.Init.RepetitionCounter = 0;
HAL_TIM_PWM_Init(&tim);
// PWM configuration
TIM_OC_InitTypeDef oc_init;
oc_init.OCMode = TIM_OCMODE_PWM1;
oc_init.Pulse = 0; // off
oc_init.OCPolarity = MICROPY_HW_LED_INVERTED ? TIM_OCPOLARITY_LOW : TIM_OCPOLARITY_HIGH;
oc_init.OCFastMode = TIM_OCFAST_DISABLE;
oc_init.OCNPolarity = TIM_OCNPOLARITY_HIGH; // needed for TIM1 and TIM8
oc_init.OCIdleState = TIM_OCIDLESTATE_SET; // needed for TIM1 and TIM8
oc_init.OCNIdleState = TIM_OCNIDLESTATE_SET; // needed for TIM1 and TIM8
HAL_TIM_PWM_ConfigChannel(&tim, &oc_init, pwm_cfg->tim_channel);
HAL_TIM_PWM_Start(&tim, pwm_cfg->tim_channel);
return PWMOUT_OK;
}