Flashing an hex file to Red Bear Lab BLE Nano (nRF51822) from command line

RE: Flashing an hex file to Red Bear Lab BLE Nano (nRF51822) from command line

tumaku — Fri, 05 Jun 2015 15:34:47 GMT

I found the cause for my issues. Nothing to do with BLE Nano, nRF51822 or j-Link. The problem was the malfunctionaing USB hardware of my PC.

I am not sure why this is happening, but sometimes the J-Link USB driver misbehaves. Although I can still flash BLE Nano from J-Link, the BLE Nano is not properly reset afterwards. This means that the installed application is not "visible" over BLE. When this situation happens, the green LED indicator of J-Link blinks at 10Hz.

If I connect J-Link to another PC or connect BLE Nano through the MK-20 USB dongle, I see that the application has been properly isntalled and is "visible" over BLE.

When this happens, I restart my PC and things start working again (I believe the issue is with the USB hardware of my old PC, not with the J-Link driver)

RE: Flashing an hex file to Red Bear Lab BLE Nano (nRF51822) from command line

tumaku — Mon, 01 Jun 2015 11:05:14 GMT

I am using both USB dongle MK20 from BLE Nano and J-Link programmer. If I use the MK-20 dragging and dropping the merged HEX file, the app is propoerly installed. If I use J-Link flashing the merged HEX file (or flashing first SD and then the app), the flashing process is successful but the app does not work/start. I guess that I miss a bootloader in the case of J-Link that MK-20 is flashing somehow by default.

If I flash the app once with MK-20, I can move the BLE Nano to J-Link and then I can reflash (only) the app from Jlink and the app is then properly updated (I assume that the MK-20 bootloader is not deleted and is still valid)

RE: Flashing an hex file to Red Bear Lab BLE Nano (nRF51822) from command line

Stian Røed Hafskjold — Mon, 01 Jun 2015 09:15:53 GMT

Are you using a J-link programmer instead of the BLE Nano dongle?