本文主要是通过迁移的思维，记录本人初次使用NXP MCUXpresso SDK API进行BSP开发
本文主要是描述基于FreeRTOS系统下，定时器的接口封装代码实现。
hal_timer_freertos.c，hal_timer_freertos.h。
来源于qcloud-iot-explorer-sdk-embedded-c 定时器代码接口
1. hal_timer_freertos.c 内容
/*Notes: !!!! HAL_Timer_ func reference qcloud-iot-explorer-sdk-embedded-c*/
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fsl_common.h"
#include "fsl_debug_console.h"
#include "hal_timer_freertos.h"
/*----------------------------------------------*
* external variables *
*----------------------------------------------*/
/*----------------------------------------------*
* external routine prototypes *
*----------------------------------------------*/
/*----------------------------------------------*
* internal routine prototypes *
*----------------------------------------------*/
/*----------------------------------------------*
* project-wide global variables *
*----------------------------------------------*/
/*----------------------------------------------*
* module-wide global variables *
*----------------------------------------------*/
/*----------------------------------------------*
* constants *
*----------------------------------------------*/
/*----------------------------------------------*
* macros *
*----------------------------------------------*/
/*----------------------------------------------*
* routines' implementations *
*----------------------------------------------*/
uint32_t HAL_GetTimeMs(void)
{
return xTaskGetTickCount();
}
/*Get timestamp*/
long HAL_Timer_current_sec(void)
{
return HAL_GetTimeMs() / 1000;
}
char *HAL_Timer_current(char *time_str)
{
long time_sec;
time_sec = HAL_Timer_current_sec();
memset(time_str, 0, TIME_FORMAT_STR_LEN);
snprintf(time_str, TIME_FORMAT_STR_LEN, "%ld", time_sec);
return time_str;
}
bool HAL_Timer_expired(Timer *timer)
{
uint32_t now_ts;
now_ts = HAL_GetTimeMs();
return (now_ts > timer->end_time) ? true : false;
}
void HAL_Timer_countdown_ms(Timer *timer, unsigned int timeout_ms)
{
timer->end_time = HAL_GetTimeMs();
timer->end_time += timeout_ms;
}
void HAL_Timer_countdown(Timer *timer, unsigned int timeout)
{
timer->end_time = HAL_GetTimeMs();
timer->end_time += timeout * 1000;
}
int HAL_Timer_remain(Timer *timer)
{
return (int)(timer->end_time - HAL_GetTimeMs());
}
void HAL_Timer_init(Timer *timer)
{
timer->end_time = 0;
}
2. hal_timer_freertos.h 内容
#ifndef __HAL_TIMER_FREERTOS_H__
#define __HAL_TIMER_FREERTOS_H__
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/**
#endif // __HAL_TIMER_FREERTOS_H__
* Define timer structure, platform dependant
*/
struct Timer {
uint32_t end_time;
};
typedef struct Timer Timer;
/**
* @brief Check if timer expires or not
*
* @param timer reference to timer
* @return true = expired, false = not expired yet
*/
bool HAL_Timer_expired(Timer *timer);
/**
* @brief Set the countdown/expired value for the timer
*
* @param timer reference to timer
* @param timeout_ms countdown/expired value (unit: millisecond)
*/
void HAL_Timer_countdown_ms(Timer *timer, unsigned int timeout_ms);
/**
* @brief Set the countdown/expired value for the timer
*
* @param timer reference to timer
* @param timeout countdown/expired value (unit: second)
*/
void HAL_Timer_countdown(Timer *timer, unsigned int timeout);
/**
* @brief Check the remain time of the timer
*
* @param timer reference to timer
* @return 0 if expired, or the left time in millisecond
*/
int HAL_Timer_remain(Timer *timer);
/**
* @brief Init the timer
*
* @param timer reference to timer
*/
void HAL_Timer_init(Timer *timer);
#define TIME_FORMAT_STR_LEN (20)
/**
* @brief Get local time in format: %y-%m-%d %H:%M:%S
*
* @return string of formatted time
*/
char *HAL_Timer_current(char *time_str);
/**
* @brief Get timestamp in second
*
* @return timestamp in second
*/
long HAL_Timer_current_sec(void);
#endif
3. 总结
初次看到鹅厂的定时器接口，觉得不错，仅供各位参考学习。