[嵌入式]嵌入式实操----基于RT1170 FreeRTOS时定器接口封装（二十二）

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。