Wake up the pyboard via PA0

dcexpert

Wake up the pyboard via PA0 [Copy link]

 

In low-power applications, in order to reduce power consumption, we need to put the microcontroller into sleep mode and then wake it up through an external button or RTC. However, until version v1.11, micropython still does not provide a function to wake up through PA0 directly after sleep mode. However, we can set it through the register method, which is not complicated to use.

To wake up through PA0, that is, the WKUP pin function, you need to set the EWUP of the PWR_CSR register to 1, and then the pyb can be woken up by the rising edge signal on the PA0 pin.

The method is as follows :

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dcexpert

Because waking up after machine.deepsleep() is equivalent to resetting, you need to first determine the reset cause through machine.reset_cause(), and then perform different processing.

dcexpert

For the STM32L4 series, more WKUP pins are supported, and rising edge or falling edge wake-up is also supported. The registers used for wake-up are also different, but the methods are similar.

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