Another way to use MicroPython serial port receive interrupt

dcexpert

Another way to use MicroPython serial port receive interrupt [Copy link]

 

 

MicroPython currently only officially provides the serial port receive interrupt function in Wipy. Although it can be used in other hardware ported versions, there are many problems, and sometimes it is not stable, and some strange problems may occur, causing it to fail to run normally.

UART.irq(trigger, priority=1, handler=None, wake=machine.IDLE)

At present, in addition to waiting for the official release of new firmware that supports serial port interrupt function, we can also use the following method to implement serial port interrupt:

• Set the serial port's RXD pin to input
• Define the level change interrupt of the RXD pin and activate the timer in the callback function
• To set a timer, you can use machine.Timer (software timer)
• Set the timer callback function and process the serial port receiving function in the callback function
• Initialize the serial port

Furthermore, if a timer can be added for serial port reception protection, the timer and serial port can be turned off after no new data is received for a certain period of time to save power consumption; or a group of data reception is considered complete and the MCU is notified for processing.

The above method is tested normally on pyboard. If all functions are encapsulated into a class, it will be more convenient to use.

dcexpert

Reference Program

The following test uses serial port 1

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