MikroElektronika Forum

Hi,
I've been successfully using the USB HID Bootloader to program my STM32. For a couple reasons, I need to update the FW using dfu-util in a MacOS terminal. Using this method, my code is also successfully programmed.

Both methods above work fine when I program a simple LED_blink code. When I use a code that implements the USB (CDC_Demo), the code doesn't start to run, if I programmed it using the second method (dfu-util).

Any ideas what might be wrong? Is it possible that my code does't know where to start? If so, why it happens only when I use the CDC_Demo and not the LED_Blink?

Thank you in advance,

Hi,

If you use USB HID bootloader to upload the CDC_Demo, does this work ?

Regards,
Filip.

When I use the USB HID Bootloader everything works fine. I narrowed down the problem and seems that the code stucks in the loop below.

WHILE(USBDEV_GETDEVICESTATE() <> _USB_DEV_STATE_CONFIGURED)
WEND

which means the USB device is never configured/enumerated. If I remove this loop, the rest of my code runs properly.

It is unclear to me what is different when I use dfu-util that causes the USB to not be configured.

Your support on this will be much appreciated. Thanks!

In general, you need to reconnect USB after downloading code.

Thank you for your input AntiMenber. When using the MikroE bootloader, re-connecting the USB is not really necessary as everything works fine.

Though, I have done this after programming with dfu-util but didn't help much.