USB Client fails on power up on STM32C07

[gus-ghielec]

Using Necleo64 with STM3232C07 support, I have this code.

void setup() {
  SerialUSB.begin();
}

void loop() {
  SerialUSB.println("Hello!");
  delay(500);
}

It works fine when loading from Arduino over DFU. However, the moment the system is reset USB will not work anymore. I suspecting an issue with USB clock initialization. USB works after DFU because USB clocks are already initialized but from a could boot USB Arduino does not work. Windows will say "unrecognized device" as teh deice is not responding to windows properly.

[fpistm]

Hi @gus-ghielec
add:
while(!SerialUSB);

[gus-ghielec]

Same behavior. This code works fine when loaded over DFU but then USB unrecognized after reset.

void setup() {
  SerialUSB.begin();
  while(!SerialUSB);
}
void loop() {

}

Please reopen this issue @fpistm

[fpistm]

It works fine on my side using Nucleo C071.
Which are options you used in the Arduino IDE ?

[fpistm]

Just remembered that C0 USB support is not in the 2.9.0 release. It has been merged in the main after the release.
#2584
You have to wait the 2.10.0 or use the main.

[gus-ghielec]

Oh ok great, thanks. This is blocking issues so any estimate when can we continue the work? Where do I look to see if the release is out yet?

[fpistm]

in the coming days/weeks. Arduino IDE will warn you that an update is available for the core.