RE: Keep USB enabled while in bootloader

Sigurd — Tue, 16 Mar 2021 13:04:44 GMT

Since the bootloader resets the device, the USB will also be reset. I don't think it's possible to change this.

RE: Keep USB enabled while in bootloader

khodidas — Fri, 05 Mar 2021 04:59:16 GMT

Sigurd

Do you have any update?

Thanks,

Nirav Patel

RE: Keep USB enabled while in bootloader

khodidas — Tue, 23 Feb 2021 09:43:07 GMT

Thanks Sigurd,

Does not facing issue what you suggest to do. Let me explain in detail.

I am using application with BLE+USB support and Bootloader with BLE only. So what happen when I update application via BLE bootloader (Jump to bootloader using NRF_BL_DFU_ENTER_METHOD_GPREGRET = 1), USB getting disabled when bootloader start running. To keep USB active I have added USB driver in BLE supported bootloader so I able to keep USB active while advertising in bootloader.

Problem is after receiving image of new firmware, bootloader reset the device to copy new image from BANK1 --> Bank_0 at that time bootloader will not activate any transport layer just copying new image and reset device again to boot new image from BANK_0.

I want to make USB enabled for whole the time like while in application and bootloader.

Step_1: In application (USB is active)

Step_2: Bootloader with BLE+USB (USB is active (As I added USB driver in BL)

Step_3: After receiving image via BLE bootloader device reset to apply new image (USB is active till reset)

Step_4: Bootloader copying image (USB is disabled)

If I will mange to enabled USB in step_4 my issue will be resolved.

Thanks,

Nirav Patel

RE: Keep USB enabled while in bootloader

Sigurd — Mon, 15 Feb 2021 08:48:29 GMT

Hi,

The USB would need to re-enumerate when you reset or jump to from/to application/bootloader. If you are having issues with re-enumerating, then maybe you could try to call nrf_drv_usbd_disable() before you reset/jump.