AT32F4 如何进入深度睡眠模式（Deepsleep Mode）？

AT32 进入深度睡眠模式（Deepsleep Mode）前需要关闭 SysTick 定时器，否则会导致进入 Deepsleep 模式后再次被 SysTick 定时器唤醒的现象。 AT32F403A 代码示例如下，其他型号请参考对应 BSP 路径\examples\pwc 下 Deepsleep 例程。

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/* clear second flag */

 rtc_flag_clear(RTC_TS_FLAG);

 /* wait for the second flag to be set */

 while(rtc_flag_get(RTC_TS_FLAG) == RESET);

 /* set the wakeup time to 3 seconds */

 rtc_alarm_set(rtc_counter_get() + 3);

 /* wait for the register write to complete */

 rtc_wait_config_finish();

 at32_led_off(LED2);

 /* save systick register configuration */

 systick_index = SysTick->CTRL;

 systick_index &= ~((uint32_t)0xFFFFFFFE);

 /* disable systick */

 SysTick->CTRL &= (uint32_t)0xFFFFFFFE;

 

 /* congfig the voltage regulator mode */

 pwc_voltage_regulate_set(PWC_REGULATOR_LOW_POWER);

 /* enter deep sleep mode */

 pwc_deep_sleep_mode_enter(PWC_DEEP_SLEEP_ENTER_WFI);

 /* restore systick register configuration */

 SysTick->CTRL |= systick_index;

 /* wake up from deep sleep mode, congfig the system clock */

 system_clock_recover();

 at32_led_on(LED2);

 for(index = 0; index < 500000; index++);