UART Serial Write appears to be blocking, arduino-mbed, Rasberry Pi Pico

westfw · August 11, 2024, 12:29am

I've submitted a bug: MBED SerialN UART drivers are unbuffered in transmit path · Issue #935 · arduino/ArduinoCore-mbed · GitHub

Apparently similar issues have shown up before (and not been addressed):

github.com/arduino/ArduinoCore-mbed

Issue with BufferedSerial on RP2040 platfrom

opened 03:27PM - 02 Jul 21 UTC

ahmedalkabir

bug enhancement help wanted RP2040

hey. I faced an issue when using BufferedSerial class specially when writing bu…ffer or data, it just write 2 data and stop ??, actually it is blocking and stuck. here's the code ```c++ #include <Arduino.h> #include "mbed.h" rtos::Thread thread_1; static mbed::BufferedSerial serial_port(p4, p5); void uart_thread() { serial_port.set_baud(115200); serial_port.write("buffer", 7); // never write all of serial_port.write("9", 1); char buf[32] = {0}; while (1) { if (uint32_t num = serial_port.read(buf, sizeof(buf))) { serial_port.write(buf, num); } } } void setup() { thread_1.start(uart_thread); } ``` I read Serial source code and I noticed it depends on UnbufferedSerial, I tested UnbufferedSerial and it worked as I expected but BufferedSerial's write functionally doesn't work well ! I used PlatformIO and Raspberry Pi Pico which is based on RP2040, so I hope the issue resolve as soon as possible and thanks 😁

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UART Serial Write appears to be blocking, arduino-mbed, Rasberry Pi Pico

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