multi_rtimer软件包是一个低功耗的实时软件定时器模块，理论上可以无限扩展应用所需的长\短定时器，可低功耗地管理时间触发任务。
multi_rtimer借鉴了LoRaMac timer 与 0x1abin/MultiTimer
- https://github.com/Lora-net/LoRaMac-node/blob/master/src/system/timer.c
- https://github.com/0x1abin/MultiTimer
主要特点：
- 支持高精度低功耗定时
- 定时精度最高可支持约31us（1/32768），缺省设置约1ms(1/1024)
- 支持长定时器
- 比如min、hour等
- 支持在STOP模式下唤醒
- 适用于超低功耗应用场景
- 当前支持的MCU平台
- STM32
- STM32L0
- STM32L4
- STM32WL
- STM32H7
- 所需外设:RTC(支持Sub-Second Alarm)
- 硬件RTC及其Alarm中断
- 要求RTC支持Sub second
使用 multi_rtimer 软件包需要在 RT-Thread 的包管理中选中它，具体路径如下：
RT-Thread online packages --->
peripheral libraries and drivers --->
[*] multi_rtimer: a real-time and low power software timer module. --->
Version (latest) --->
multi_rtimer options --->
[] multi_rtimer demo example
- 硬件RTC初始化：
int hw_rtc_init(void);
该函数主要完成的功能有:
- RTC外设配置：
- 设置RTC外设初始化、设置RTC date与time；
- Alarm中断使能等；
- 定义定时器管理对象
static timer_event_t led0_timer;
- 初始化定时器对象，注册定时器回调函数
void rtimer_init( timer_event_t *obj, void ( *callback ))
- 设置定时时间(ms)
void rtimer_set_value( timer_event_t *obj, uint32_t value )
- 启动定时器
void rtimer_start( timer_event_t *obj )
- 停止定时器
void rtimer_stop( timer_event_t *obj )
LoRaWAN timer API
#define TimerInit rtimer_init
#define TimerStart rtimer_start
#define TimerStop rtimer_stop
#define TimerReset rtimer_reset
#define TimerSetValue rtimer_set_value
#define TimerGetCurrentTime rtimer_get_current_time
/*!
* \brief Function executed on Led 0 Timeout event
*/
static void on_led0_timeout(void)
{
rtimer_stop( &led0_timer );
rt_kprintf("on_led0_timeout,%d,on shot\r\n",rtimer_get_current_time());
}
/*!
* \brief Function executed on Led 1 Timeout event
*/
static void on_led1_timeout(void)
{
////rtimer_stop( &led1_timer );
rtimer_reset( &led1_timer );
rt_kprintf("on_led1_timeout,%d\r\n",rtimer_get_current_time());
}
/*!
* \brief Function executed on Led 3 Timeout event
*/
static void on_led3_timeout(void)
{
interval_ms = interval_ms * 10;
// stop timer then set new timer interval
TimerSetValue( &led3_timer,interval_ms);
TimerStart( &led3_timer );
rt_kprintf("on_led3_timeout:%d,interval:%d ms\r\n",rtimer_get_current_time(),interval_ms);
}
int rt_multi_rtimer_init(void)
{
hw_rtc_init();
// on shot
rtimer_init( &led0_timer, on_led0_timeout );
rtimer_set_value( &led0_timer, 60000 ); // 60s
rtimer_start( &led0_timer );
rt_kprintf("led0_timer start,%d\r\n",rtimer_get_current_time());
// periodicity
rtimer_init( &led1_timer, on_led1_timeout );
rtimer_set_value( &led1_timer, 1000 ); // 1000ms
rtimer_start( &led1_timer );
rt_kprintf("led1_timer start,%d\r\n",rtimer_get_current_time());
// change the interval
// Use LoRaWAN Timer API
TimerInit( &led3_timer, on_led3_timeout );
TimerSetValue( &led3_timer, interval_ms ); // 1ms * 10^n
TimerStart( &led3_timer );
rt_kprintf("led3_timer start,%d\r\n",rtimer_get_current_time());
#ifdef RT_USING_PM
rt_pm_request(PM_SLEEP_MODE_DEEP);
#endif
return 0;
}
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