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RP2040 Core1 stops when connected via usb #378

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MNS26 opened this issue Jan 4, 2022 · 3 comments
Open

RP2040 Core1 stops when connected via usb #378

MNS26 opened this issue Jan 4, 2022 · 3 comments

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@MNS26
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@MNS26 MNS26 commented Jan 4, 2022 •
edited

after trying to fiddle with the pi pico trying to get core1 to "fade" the builtin led (pin 25 ) it would stop right after upload.
thinking it was a voltage issue (unlikely but who knows) i tried running it without usb and giving it 5v on Vusb directly, then it did work.

(i already wrote something similar in a different issue but that was related to something else)
#217 (comment)

the code i used:

#include <mbed.h>
#include <Arduino.h>
#include "pico/multicore.h"
#include  "hardware/structs/sio.h" 
#define CORE1_LED 25u
int brightness=0;
int fadevalue = 10;
void core1_loop()
{
  while(1)
  {
  brightness=brightness+fadevalue;
  if(brightness <=0 || brightness >= 2048) {
    fadevalue = -fadevalue;
  }
    digitalWrite(CORE1_LED,HIGH);
    sleep_us(brightness);
    digitalWrite(CORE1_LED,LOW);
    sleep_us(1000);
  }
}

void setup()
{
  pinMode(CORE1_LED,OUTPUT);
  //multicore_reset_core1();
  multicore_launch_core1(core1_loop);
}

void loop()
{
}
@dlivingstone
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@dlivingstone dlivingstone commented Jan 5, 2022

It might be an issue with the empty loop() - try adding a short delay or sleep.

@MNS26
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@MNS26 MNS26 commented Jan 5, 2022

@dlivingstone then it should also be causing issues when not connected via usb.

@MaximumOctopus
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@MaximumOctopus MaximumOctopus commented May 1, 2022

FWIW, I've also noticed this issue (just now). When powered via USB from a laptop, the core1 code isn't executing. When powered by 5V via VBus and GND, both cores work as expected. If I power it via the USB port from one of those cheap rechargeable battery power banks (£1 from poundstretcher) it also works as expected.

The code I'm using is very simple. Two LEDs flashing at different rates, one per core. I'm using a framework very similar to the OP's code, plus a flasher (on, delay, off, delay) in loop().

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@dlivingstone @MaximumOctopus @MNS26