GEX core repository.
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
gex-core/platform/timebase.h

61 lines
1.3 KiB

//
// Created by MightyPork on 2018/01/27.
//
// Configures and manages the high priority timer used for timeouts and precision delays.
//
// SysTick can't be used for this because, under FreeRTOS, the system tick interrupt
// has the lowest priority to not interfere with more important application processes
// and interrupts.
//
#ifndef GEX_F072_TIMEBASE_H
#define GEX_F072_TIMEBASE_H
#include "platform.h"
#define TIMEBASE_TIMER TIM17
/**
* Precision timer: get microtime as uint64_t
* This timestamp should be monotonously increasing with a precision of ±0.5µs
*
* @return time in microseconds
*/
uint64_t PTIM_GetMicrotime(void);
/**
* Get time in milliseconds since start
*
* @return time in ms
*/
static inline uint32_t PTIM_GetTime(void)
{
return HAL_GetTick();
}
/**
* Microseconds busy delay
*
* @param usec - max 998
*/
void PTIM_MicroDelay(uint32_t usec);
/**
* Microsecond busy delay with alignment (reduced length jitter but possible up to 1 us delay)
*
* @param usec
*/
void PTIM_MicroDelayAligned(uint32_t usec, uint32_t start);
/**
* Wait until the next micro timer tick
*/
static inline uint32_t PTIM_MicroDelayAlign(void)
{
const uint32_t c = TIMEBASE_TIMER->CNT;
uint32_t res;
while ((res = TIMEBASE_TIMER->CNT) == c);
return res;
}
#endif //GEX_F072_TIMEBASE_H