First time noob - flashing bootloader onto E73-2G4M08S1C nrf52840 modules

RE: First time noob - flashing bootloader onto E73-2G4M08S1C nrf52840 modules

Susheel Nuguru — Fri, 18 Nov 2022 11:42:14 GMT

I do not know what is in those hex files of bootloaders and how they should work, . Probably someone else in this forum might know about these external tools and libraries

RE: First time noob - flashing bootloader onto E73-2G4M08S1C nrf52840 modules

MCorgano — Thu, 17 Nov 2022 09:43:58 GMT

I have had partial success but not quite. I'm trying to get circuit python onto an nRF52840 module that didn't come with a bootloader Module is this https://www.ebyte.com/en/downpdf.aspx?id=445
Same as on this dev board https://circuitpython.org/board/bluemicro840/

Using these instructions I got OpenOSD onto my pi 4, using it for programming and I can write a bootloader and verify it, all appears to work https://github.com/joric/nrfmicro/wiki/Bootloader
Ran the reset run command, plugged it into my computer... and nothing

I swapped out the file they used for the ebyte_e73_tbb_bootloader-0.7.0_s132_6.1.1.hex file from https://github.com/adafruit/Adafruit_nRF52_Bootloader/releases Ran the reset run, plugged it into my laptop..... nothing.

As far as i can tell, the usb connection (used for power while programming as well) going to VBUS, D-, D+, and Gnd, is connected properly. Using the bootloader the guide recommends windows gives a "this device isn't recognized" Using the bootloader from the adafruit page for the E73 (what is engraved on the module itself) and plugging it into windows gives nothing.

Any ideas?

RE: First time noob - flashing bootloader onto E73-2G4M08S1C nrf52840 modules

MCorgano — Mon, 14 Nov 2022 13:42:02 GMT

Thankyou for the info! I found a guide somewhere that mentioned using a raspberry pi and open osd (or something like that) to program the bootloader. I do have some spare pi 4s kicking around, so I'm going to try that route. I'll check if any of my dedicated programmers use those connections and check back with what I have available to me.

RE: First time noob - flashing bootloader onto E73-2G4M08S1C nrf52840 modules

Susheel Nuguru — Mon, 14 Nov 2022 11:21:22 GMT

You have the SWDIO and SWCLK pints on your module.

You just to pull these pins our (using or wire or similar) to be able to connect it to the debugger that supports programming through SWD ports. You can use another nRF52 DK as a programmer to connect the SWD pins to your module to program/debug it.