In software that is not part of the system, it is easy to achieve low power consumption mode using the RTC+STOP mode. However, in operating systems such as UCOS, it is a bit troublesome to achieve this mode. The biggest problem is that task switching cannot be controlled, and the program often runs away after being woken up.
First, put the dormant code segment in a low-priority task, which does not have to be the system's built-in idle task, but can also be a user-defined task with the lowest priority.
Second, add two instructions before and after the sleep code:
//================================================ ===================================
OSSchedLock(); //Disable task scheduling
while(1)
{
.....//Sleep code RTC+STOP
PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
....//Judge whether to exit sleep mode
}
....//Reinitialize system clock and GPIO
....//OS_CPU_SysTickInit();//It is very important to reinitialize systick, otherwise it will run away
OSSchedUnlock(); //Allow task scheduling
//================================================ ===================================
In fact, you only need to add two instructions to solve the task switching problem.
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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