pyOCD MBED firmware install for ZephyrOS

[erik]

Hi,

Developing on nRFConnect/ZephyrOS and looking to enable multi-threaded debugging using pyOCD firmware on nRF52 DK, since not currently/yet supported by JLink.

Was pointed to https://www.nordicsemi.com/Software-and-tools/Development-Kits/nRF52-DK/Download#infotabs (by Carles Cufi) as a place to find

the binary to download to nRF52840 board to replace the JLink SW. (The newer Nordic site no longer appears to provide link to this SW)

The DK user guide mentions SW5 is used to set Atmel MCU into bootloader mode, but I couldn't find an further instructions how to get the pyOCD firmware installed. Does one use nRFjlink tools to update the firmware? Would also be helpful to understand how would reprogram with JLink - would one need to use pyOCD to get back, because many Nordic tools rely on Jlink?

Also would be great if you could provide release notes for the Firmware. Are there dependency issues with pyOCD host SW (we appear to need very recent version published Aug 2020)

Since this is needed for ZephyrOS debugging, would be great to provide more updated links and instructions on website.

I see in https://www.nordicsemi.com/-/media/Software-and-other-downloads/Dev-Kits/nRF5x-DK-files/nrf5x_atsam3u2c_if_mbed_V0221_11012017.bin that the Firmware at the above link may not even be compatible with nRF5280. Is there a path to move forward, or we need to purchase an nRF52832DK in order to do this?

Thanks,

 Erik

[Håkon Alseth]

Hi,

 

When holding down the "IF BOOT/RESET" button while powering on the kit, you're entering bootloader mode (a drive named "BOOTLOADER" shall appear). You program the debugger IC by dragging/copying a binary to this drive.

In this mode, you are programming the SEGGER IC (SAM3 is present on nRF51- and nRF52-DKs), so please be aware that you shall only program a *_atsam3u2c_*.bin in this mode!

 

To switch to SEGGER JLink, use this one:

https://www.nordicsemi.com/-/media/Software-and-other-downloads/Dev-Kits/nRF5x-DK-files/J-Link-OB-SAM3U128-V2-NordicSemi-170724.bin

To switch to CMSIS-DAP (DAPLink), use this one:

https://www.nordicsemi.com/-/media/Software-and-other-downloads/Dev-Kits/nRF5x-DK-files/nrf5x_atsam3u2c_if_mbed_V0221_11012017.bin

Source code for bootloader and cmsis-dap interface this is available here: https://github.com/NordicPlayground/CMSIS-DAP

Again: Do not program the device with any other binary when in BOOTLOADER mode! Do not attempt to give a nRF compiled binary to the BOOTLOADER drive.

 

The CMSIS-DAP debugger shall be supported in PyOCD.

 

Note: This will not work for other than nRF51- and nRF52-DKs. Do not attempt this above sequence blindly for nRF9160 or nRF5340, as they have another debugger IC!

 

Kind regards,

Håkon