on a razer laptop on ubuntu using the arduino toolchain i uploaded the following code:

#include "M5Cardputer.h"

typedef void (*thread_t)(); // define a simple type for a function pointer

static int constexpr num_threads = 2;
thread_t threads[num_threads];
thread_t current_thread;

void thread_01() 
{ 
  Serial.println("Thread 01");

  // M5Cardputer.Display.drawString("Thread 01",
  //                               M5Cardputer.Display.width() * 0.25,
  //                             M5Cardputer.Display.height() * 0.25 );

} 

void thread_02() 
{ 
  Serial.println("Thread 02");

  // M5Cardputer.Display.drawString("Thread 02",
  //                               M5Cardputer.Display.width() * 0.75,
  //                             M5Cardputer.Display.height() * 0.75 );

} 

void setup(){

  auto cfg = M5.config();
  M5Cardputer.begin(cfg);
  M5Cardputer.Display.setRotation(1);
  M5Cardputer.Display.setTextColor(GREEN);
  M5Cardputer.Display.setTextDatum(middle_center);
  M5Cardputer.Display.setTextFont(&fonts::FreeSans18pt7b);
  M5Cardputer.Display.setTextSize(1);

  Serial.begin(115200);

  threads[0] = &thread_01;
  threads[1] = &thread_02;

}

void loop() {

  Serial.println("Main Loop");

  M5Cardputer.Display.drawString("Hello",
                                  M5Cardputer.Display.width() / 2,
                                M5Cardputer.Display.height() / 2 );



  for ( int n = 0; n< num_threads; n++) {
    threads[n]();
  }

}

now when i USB power the device it shows Hello in large friendly letters, but will not accept any new serial uploads from the ardulapino ide or from M5Burner. Though I can see the "Main Loop" text in the serial monitor of the IDE.

Does anyone here know how to get back from this predicament?

Thanks,
Sean