Bootloader for Atmel (Microchip) Curiosity Nano SAMD21

I've recently acquired an Atmel Curiosity Nano SAMD21 board and a Curiosity Nano adapter board to play with and I'm trying to get a bootloader to work on the SAMD21.

I've downloaded the Arduino Core SAMD files from github and chosen the zero bootloader as my starting point.

The Atmel Curiosity Nano SAMD21 uses a SAMD21G17D micro whereas the Arduino Zero uses a SAMD21G18 device. I've been reading through the Lower memory SAMD21 variant thread discussing something similar but for a SAMD21E17 device.

I've modified the Arduino Zero bootloader to use the on-board LED and re-route the serial port out via the EDBG debugger port. The bootloader loads and runs. I get the pulsing LED which I think means that the bootloader is a mode where I can upload a sketch.

However, the programming tool (BOSSAC I think) doesn't appear to support the SAMD21G17D device, so I'm looking at the UF2 drag and drop way of programming it. Reading though various details, it seems a quick double reset should make a new drive letter appear on my WIN10 PC so I can drag & drop the .uf2 file on it. This doesn't happen and I always get the native USB interface appearing as a serial port.

I've tried the Adafruit feather M0 bootloader files as well but I think i've got a mis-match with the Arduino SAMD libraries, as the compiler flags an error in the board_driver_usb.c file regarding the TRCPT bit the device endpoint register in the USB interface. The compiler suggests I may mean TRCPT0. Having looked at the source code there's a conditional compilation check that uses TRCPT1 if the device is defined as SAMR12G18A.

Ultimately, I think i've got various bootloaders where the source isn't compatible with the latest Arduino SAMD libraries & headers.

Has anybody got a link to a working bootloader for the Atmel Curiosity Nano SAMD21, or a pointer to the source for one, that supports the UF2 drag and drop programming method?


This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.