Is it possible to use MK20 to program Raytac's MDBT40

[Stanislav Silnitskiy]

Hello! For beginning with nRF51 I chose BLE Nano set of boards (BLE Nano + MK20 USB donbgle) and it was of great help to easily begin with BLE. So far, we came to the need of custom design with options to use Raytac's modules or print own PCB. Either way requires a programming tool, and the subject question comes to the scene. We also plan to use nRF52 due to intensive floating point operation, so I'd be happy to consider this SoC as well.

[monpetit]

Yes you can. MK20 can program any cortex-m device.

[Stanislav Silnitskiy]

Hi,

The error message said something like "Error writing sector 281", as reported by dmesg (I use linux PC to program)

I have this one (www.embeddedartists.com/.../tool_cr_redprobe.php), but I don't know how correctly connect it to Raytac (I'm afraid to brick it). I used to program with LPCXpresso other chips (like LPC11xxx) and haven't figured it out how to setup nRF5x environment for LPCXpresso so far.

I tried both pull down SWCLK with 10k resistor as well as connecting 32kHz crystal with two capacitors to due pins of Raytac's MDBT40... no success at all. I also observed a +3.78 voltage in SWD pins , while I fed the module with +3.3 only. Is it normal?