Sending more than 63 characters causes Serial to hang

[technoblogy]

With this test program:

void setup() {
  Serial.begin(9600);
}

void loop (void) {
  if (Serial.available()) Serial.print((char)Serial.read());
}

if you repeatedly paste this 62-character string into the Arduino IDE Serial Monitor input field and press Return it gets echoed fine:

$0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXY

However if you use this string of 63 characters it immediately hangs up:

$0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

I'm using the core Arduino Mbed OS RP2040 Boards 2.0.0 on a MacBook Pro with Arduino IDE 1.8.13. The board is a Raspberry Pi Pico.

[facchinm]

Hi @technoblogy ,
thanks for reporting. On Linux there's no such issue (just tested), so I'd ask @sebromero or @alranel to test the issue on their shiny Macbooks 😉

[technoblogy]

Thank you!

[sebromero]

@facchinm Confirmed. Looks like it's time to solder the SWD headers...

[technoblogy]

Any progress on tracking this down?

[facchinm]

@technoblogy I pushed #218 , tested on OSX 🙂 May you test it too and report if everything is fixed?

[technoblogy]

It works perfectly - thank you! I can now send 8000 bytes over serial with no errors.

Any idea when this fix will be included in a new Arduino core release?

[facchinm]

The release is expected very early next week 🙂

[technoblogy]

Thanks! That's enabled me to port my Lisp interpreter, uLisp, to the Raspberry Pi Pico;

http://www.ulisp.com/show?3KN3

[alranel]

@technoblogy Consider mentioning the Arduino Nano RP2040 Connect board in your tutorial as a way to support our work on this open source software :)