前两天在研究FreeRTOS的Tickless低功耗管理，使用的是CH582的板子，一直卡在portSUPPRESS_TICKS_AND_SLEEP()宏的实现上面。具体问题如下：
使用LowPower_Halt休眠没有问题，使用LowPower_Sleep休眠时，系统在切换任务时就直接卡B了。
非常郁闷，尝试了各种方法都不行，直到我看到这个：
也就是说CH58X系列的systick在休眠后是会复位配置和计数的，这不坑爹嘛！
废话不多少，上代码。以下是portSUPPRESS_TICKS_AND_SLEEP()宏的具体实现：
/* Define the function that is called by portSUPPRESS_TICKS_AND_SLEEP(). */
void vApplicationSleep( uint32_t xExpectedIdleTime ) {
#if(defined(HAL_SLEEP)) && (HAL_SLEEP == TRUE)
unsigned long ulLowPowerTimeBeforeSleep, ulLowPowerTimeAfterSleep, ulLowPowerTimeTotalSleep, irq_status;
eSleepModeStatus eSleepStatus;
uint32_t time_sleep, time_curr, time;
/* Stop the timer that is generating the tick interrupt. */
PFIC_DisableIRQ(RTC_IRQn);
PFIC_DisableIRQ(SysTick_IRQn);
SYS_DisableAllIrq(&irq_status);
ulLowPowerTimeBeforeSleep = RTC_GetCycle32k();
time = xExpectedIdleTime * 32.768 + ulLowPowerTimeBeforeSleep;
if (time >= RTC_TIMER_MAX_VALUE) {
time -= RTC_TIMER_MAX_VALUE;
}
if (time < WAKE_UP_RTC_MAX_TIME + 32) {
PFIC_EnableIRQ(SysTick_IRQn);
SYS_RecoverIrq(irq_status);
return;
}
time -= (WAKE_UP_RTC_MAX_TIME + 32);
time_curr = RTC_GetCycle32k();
// 检测睡眠时间
if (time < time_curr) {
time_sleep = time + (RTC_TIMER_MAX_VALUE - time_curr);
} else {
time_sleep = time - time_curr;
}
if (time_sleep > (RTC_TIMER_MAX_VALUE - TMOS_TIME_VALID)) {
PFIC_EnableIRQ(SysTick_IRQn);
SYS_RecoverIrq(irq_status);
return;
}
/* Ensure it is still ok to enter the sleep mode. */
eSleepStatus = eTaskConfirmSleepModeStatus();
if( eSleepStatus == eAbortSleep ) {
PFIC_EnableIRQ(SysTick_IRQn);
SYS_RecoverIrq(irq_status);
}
else {
if( eSleepStatus == eNoTasksWaitingTimeout ) {
LowPower_Shutdown(0);
}
else {
RTC_SetTignTime(time);
//PFIC_EnableIRQ(RTC_IRQn);
#if(DEBUG == Debug_UART1) // 使用其他串口输出打印信息需要修改这行代码
while((R8_UART1_LSR & RB_LSR_TX_ALL_EMP) == 0) {
__nop();
}
#endif
// LOW POWER-sleep模式
if(!(R8_RTC_FLAG_CTRL & RB_RTC_TRIG_FLAG)) {
LowPower_Sleep_Event(RB_PWR_RAM2K | RB_PWR_RAM30K | RB_PWR_XROM | RB_PWR_EXTEND | RB_PWR_CORE);
if(R8_RTC_FLAG_CTRL & RB_RTC_TRIG_FLAG) { // 注意如果使用了RTC以外的唤醒方式，需要注意此时32M晶振未稳定
R8_RTC_FLAG_CTRL = RB_RTC_TRIG_CLR;
time += WAKE_UP_RTC_MAX_TIME;
if(time > 0xA8C00000) {
time -= 0xA8C00000;
}
RTC_SetTignTime(time);
LowPower_Idle_Event();
R8_RTC_FLAG_CTRL = RB_RTC_TRIG_CLR;
}
HSECFG_Current(HSE_RCur_100); // 降为额定电流(低功耗函数中提升了HSE偏置电流)
vPortSetupTimerInterrupt(); // 恢复SysTick配置
}
ulLowPowerTimeAfterSleep = RTC_GetCycle32k();
if (ulLowPowerTimeAfterSleep < ulLowPowerTimeBeforeSleep) {
ulLowPowerTimeTotalSleep = ulLowPowerTimeAfterSleep + (RTC_TIMER_MAX_VALUE - ulLowPowerTimeBeforeSleep);
}
else {
ulLowPowerTimeTotalSleep = ulLowPowerTimeAfterSleep - ulLowPowerTimeBeforeSleep;
}
ulLowPowerTimeTotalSleep = ulLowPowerTimeTotalSleep * 1000 / 32768;
vTaskStepTick( ulLowPowerTimeTotalSleep );
//PRINT("ulLowPowerTimeTotalSleep = %d xExpectedIdleTime=%d\n", ulLowPowerTimeTotalSleep, xExpectedIdleTime);
//PRINT("xTickCount = %d\n", xTaskGetTickCount());
}
SYS_RecoverIrq(irq_status);
PFIC_EnableIRQ(SysTick_IRQn);
}
#endif
}
重点是休眠唤醒后，需要调用vPortSetupTimerInterrupt()恢复SysTick配置。
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