49 lines
917 B
C
49 lines
917 B
C
/*
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* pwm.c
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*
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* Created on: Jan 16, 2018
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* Author: wn
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*/
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#include "pwm.h"
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#include "stm32f1xx_hal.h"
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#include <PontCoopScheduler.h>
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extern TIM_HandleTypeDef htim3;
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const int32_t PWM_MAX = 10000;
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const int32_t PWM_STEP = 200;
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typedef struct {
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int32_t value;
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int32_t direction;
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} tPwmHandle;
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tPwmHandle pwmHandle = { .value = 0, .direction = 1 };
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void pwmExec(void *handle) {
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tPwmHandle *lPwmHandle = (tPwmHandle*) handle;
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lPwmHandle->value += (PWM_STEP * lPwmHandle->direction);
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if (lPwmHandle->value >= PWM_MAX) {
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lPwmHandle->direction = -1;
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}
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if (lPwmHandle->value <= 0) {
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lPwmHandle->direction = 1;
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}
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__HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_1, lPwmHandle->value);
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}
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void pwmInit() {
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schAdd(pwmExec, &pwmHandle, 0, 50);
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__HAL_TIM_SET_AUTORELOAD(&htim3, PWM_MAX);
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__HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_1, 0);
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HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1);
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}
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