9 years, 3 months ago.

USBSerial stop working after first connection

Hi,

I've been playing with USBSerial along with raw Serial thru UART, all in the RTOS context. I'm instantiating the USBSerial with connect_blocking=false so that all code is working if I dont attach picocom to /dev/ttyACM0 at startup. The code is outputing prints thru both UART and USB while flashing leds in the mainloop. At the first connection to /dev/ttyACM0, everything is working, both UART and USB, but as soon as I quit picocom and try to comeback to /dev/ttyACM0, nothing is outputted anymore. Also, if I don't connect to /dev/ttyACM0 right at the beginning, it will block at the first usb.printf() although I've mentionned connect_blocking=false. Is there a way to make USBSerial really Non-Blocking ?

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1 Answer

8 years, 6 months ago.

I found same problem.

My walkarround has been to enable the watchdog, a "selfreset" when blocking is perfect for me. It was quite hard to enable watchdog in my KL25Z.

I know that is not your board but you can take a look to this anyway: https://developer.mbed.org/users/Manel_Marin/code/KL25Z_WATCHDOG_USBSERIAL/