2 定时器相关¶
2.1 Delay function;¶
1，HAL layer delay function;：（Equivalent to the instruction loop in while, and will not switch to other threads during the delay;）
HAL_Delay(10); /* 延时10ms */
HAL_Delay_us(10); /* 延时10us */
2，RTT interface delay function;：
When the RTT interface delay function is executed, it will switch to other threads;，For example, the ilde thread will enter Standby sleep when the sleep threshold is lower than the delay duration;
rt_thread_delay(100); /* 延时100ms */
2.2 Get timestamp; Tick值和RC10K振荡频率¶
1，Get timestamp;：
/* 32768 crystal clock, will add 1 to the register value every 1/32768 second;*/
/* RC10K clock, will add 1 to the register value approximately every 1/9000 second;*/
uint32_t start_time = HAL_GTIMER_READ();
2，Get Tick value incremented by 1m seconds;：
rt_tick_t start_timer = rt_tick_get(); /* RTT system function, return value will add 1 every 1m second; */
uint32_t tickstart = HAL_GetTick(); /* HAL layer function, return value will add 1 every 1m second; */
3，Get current clock frequency;：
/* 32768 crystal clock, will return 32768;*/
/* RC10K clock, will return a value between 8k-10k;*/
uint32_t mcuOscData = HAL_LPTIM_GetFreq();
2.3 Serial port command to view existing timers;¶
list_timer
Description of list_timer status;:
The first column “timer” is the timer name;;
The second column “periodic” is the timer period (in hexadecimal, unit ms);;
The third column “timeout” is the timestamp for the next timer arrival;;
The fourth column “flag” indicates whether the timer is active;，
如上图，The only effective timer is the “main” timer (the delay function is also a timer), with a wake-up period of 0xbb8 (3000ms);。