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61 lines
1.3 KiB
61 lines
1.3 KiB
//
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// Created by MightyPork on 2018/01/27.
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//
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// Configures and manages the high priority timer used for timeouts and precision delays.
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//
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// SysTick can't be used for this because, under FreeRTOS, the system tick interrupt
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// has the lowest priority to not interfere with more important application processes
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// and interrupts.
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//
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#ifndef GEX_CORE_TIMEBASE_H
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#define GEX_CORE_TIMEBASE_H
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#include "platform.h"
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#define TIMEBASE_TIMER TIM17
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/**
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* Precision timer: get microtime as uint64_t
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* This timestamp should be monotonously increasing with a precision of ±0.5µs
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*
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* @return time in microseconds
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*/
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uint64_t PTIM_GetMicrotime(void);
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/**
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* Get time in milliseconds since start
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*
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* @return time in ms
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*/
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static inline uint32_t PTIM_GetTime(void)
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{
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return HAL_GetTick();
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}
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/**
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* Microseconds busy delay
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*
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* @param usec - max 998
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*/
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void PTIM_MicroDelay(uint32_t usec);
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/**
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* Microsecond busy delay with alignment (reduced length jitter but possible up to 1 us delay)
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*
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* @param usec
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*/
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void PTIM_MicroDelayAligned(uint32_t usec, uint32_t start);
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/**
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* Wait until the next micro timer tick
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*/
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static inline uint32_t PTIM_MicroDelayAlign(void)
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{
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const uint32_t c = TIMEBASE_TIMER->CNT;
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uint32_t res;
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while ((res = TIMEBASE_TIMER->CNT) == c);
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return res;
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}
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#endif //GEX_CORE_TIMEBASE_H
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