Delay function not working in the main loop on m4 core

Official Hardware Opta
1

Hi all,

I'm trying to use the m4 core on opta in parallel with m7 core.
My program on m7 work fine. I added
bootM4();
on setup in m7 side to launch the m4.
Now this is my code for m4

#include <Arduino.h>
#include <mbed.h>
#include <rtos.h>

using namespace mbed;
using namespace rtos;
using namespace std::chrono_literals;

DigitalOut ledUser(PE_5);

void setup()
{
  ledUser.write(1);
  ThisThread::sleep_for(1s);
  ledUser.write(0);
  ThisThread::sleep_for(1s);
  ledUser.write(1);
  ThisThread::sleep_for(1s);
}

void loop()
{
  ledUser.write(0);
  ThisThread::sleep_for(1s);
  ledUser.write(1);
}

The blue led blink when i'm in the setup but when i enter in the main loop, the led goes to low (first line) but the program stuck at the sleep line ...

Can you help please ?

2

The loop() is pretty fast, so I think if you end it with write(1), the next cycle starts almost immediately and executes write(0), then waits back 1 second. the result is you can't ever see the led be turned on.
Try it with another sleep before the end:

void loop()
{
  ledUser.write(0);
  ThisThread::sleep_for(1s);
  ledUser.write(1);
  ThisThread::sleep_for(1s);
}
3

Oh yes, beginner error ...
Thank you
Is it possible also on m4 side to use serial to debug (also used on m7 !)

4

I'm sorry I don't know as I never used it!