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122 lines
3.1 KiB
122 lines
3.1 KiB
//
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// Created by MightyPork on 2018/01/27.
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//
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#include "platform.h"
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#include "timebase.h"
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// ---------------------------- HAL TIMEBASE -----------------------------
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#define TIMEBASE_TIMER TIM17
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HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
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{
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// EDIT - used 17 instead because 14 was needed for fcap
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// TIM14 is a simple 16-bit timer timer with no special features.
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// This makes it a good choice for the timebase generation. We set it to generate
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// an interrupt every 1 ms
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assert_param(TickPriority == 0); // any other setting can lead to crashes
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// - TIM14 is always up-counting
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// - using APB1 clock
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__HAL_RCC_TIM17_CLK_ENABLE();
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NVIC_SetPriority(TIM17_IRQn, TickPriority); // highest possible priority
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NVIC_EnableIRQ(TIM17_IRQn);
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/* Compute TIM1 clock */
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uint32_t uwTimclock = HAL_RCC_GetPCLK1Freq();
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/* Get a 1 MHz clock for the timer */
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uint16_t uhPrescalerValue = (uint16_t) ((uwTimclock / 1000000) - 1);
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/* Get 1 kHz interrupt */
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uint16_t uhPeriod = (1000000 / 1000) - 1;
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LL_TIM_SetPrescaler(TIMEBASE_TIMER, uhPrescalerValue);
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LL_TIM_SetAutoReload(TIMEBASE_TIMER, uhPeriod);
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LL_TIM_EnableARRPreload(TIMEBASE_TIMER);
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LL_TIM_EnableIT_UPDATE(TIMEBASE_TIMER);
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LL_TIM_GenerateEvent_UPDATE(TIMEBASE_TIMER);
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LL_TIM_EnableCounter(TIMEBASE_TIMER);
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/* Return function status */
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return HAL_OK;
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}
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static volatile uint32_t uwUptimeMs = 0;
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/* TIMEBASE TIMER ISR */
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void TIM17_IRQHandler(void)
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{
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uwUptimeMs++;
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LL_TIM_ClearFlag_UPDATE(TIMEBASE_TIMER);
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}
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void HAL_IncTick(void)
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{
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uwUptimeMs++;
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}
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uint32_t HAL_GetTick(void)
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{
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return uwUptimeMs;
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}
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void HAL_SuspendTick(void)
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{
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LL_TIM_DisableIT_UPDATE(TIMEBASE_TIMER);
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}
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void HAL_ResumeTick(void)
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{
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LL_TIM_EnableIT_UPDATE(TIMEBASE_TIMER);
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}
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// -------------------------- DELAY FUNCTIONS AND TS -----------------------------
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/*
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* I wanted to freeze time. I wanted to savor that moment, to live in that moment
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* for a week. But I couldn't stop it, only slow it. And before I knew it, she was gone.
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* -- Ben Willis, "Cashback"
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*/
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uint64_t PTIM_GetMicrotime(void)
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{
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uint32_t uwMicros;
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uint32_t uwMillis;
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vPortEnterCritical();
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{
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uwMicros = TIMEBASE_TIMER->CNT;
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uwMillis = uwUptimeMs;
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if (LL_TIM_IsActiveFlag_UPDATE(TIMEBASE_TIMER)) {
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// This means the timer has overflown after we disabled IRQ
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// Use the last CNT value before the overflow
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uwMicros = TIMEBASE_TIMER->ARR; // this is 999us
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}
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}
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vPortExitCritical();
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return (uint64_t) uwMillis * 1000 + uwMicros;
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}
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/** microsecond delay */
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void PTIM_MicroDelay(uint16_t usec)
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{
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assert_param(usec < 1000);
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const uint16_t start = (uint16_t) TIMEBASE_TIMER->CNT;
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const uint16_t remain = (uint16_t) (999 - start);
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if (remain > usec) {
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// timer still has enough space going forward to pass the required wait time
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for (; TIMEBASE_TIMER->CNT < start + usec;);
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}
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else {
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// timer is too close to the end
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usec -= remain;
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for (; TIMEBASE_TIMER->CNT >= start || TIMEBASE_TIMER->CNT < usec;);
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}
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}
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