mirror of https://github.com/rusefi/bldc.git
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
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/*
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Copyright 2019 Benjamin Vedder benjamin@vedder.se
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This file is part of the VESC firmware.
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The VESC firmware is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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The VESC firmware is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "timer.h"
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#include "ch.h"
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#include "hal.h"
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#include "stm32f4xx_conf.h"
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// Settings
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#define TIMER_HZ 1e7
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void timer_init(void) {
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
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uint16_t PrescalerValue = (uint16_t) ((SYSTEM_CORE_CLOCK / 2) / TIMER_HZ) - 1;
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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TIM_TimeBaseStructure.TIM_Period = 0xFFFFFFFF;
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TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
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TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);
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TIM5->CNT = 0;
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TIM_Cmd(TIM5, ENABLE);
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}
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uint32_t timer_time_now(void) {
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return TIM5->CNT;
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}
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float timer_seconds_elapsed_since(uint32_t time) {
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uint32_t diff = TIM5->CNT - time;
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return (float)diff / (float)TIMER_HZ;
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}
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/**
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* Blocking sleep based on timer.
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*
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* @param seconds
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* Seconds to sleep.
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*/
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void timer_sleep(float seconds) {
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uint32_t start_t = TIM5->CNT;
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for (;;) {
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if (timer_seconds_elapsed_since(start_t) >= seconds) {
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return;
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}
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}
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}
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