Not able to programme nrf51822_xxAC board with keil/Jlink/mbed

[Yatin Varachhia]

Hi,

I have my custom nRF51822 board based on Raytac MDBT40-P module. I am trying to program it with nRF51-DK(PCA10028). I could program it with mbed interface once or twice but not anymore. It is giving following error message when I am trying to program it.

> Load "..\\..\\..\\..\\..\\..\\components\\softdevice\\s130\\hex\\s130_nrf51_2.0.0_softdevice.hex" 
> 
> Set JLink Project File to
> "C:\Users\yatin\Google
> Drive\light_bag_project\nRF5_SDK_11.0.0_89a8197_fresh\examples\ble_peripheral\ble_app_uart\pca10028\s130\arm5_no_packs\JLinkSettings.ini"
> 
> * JLink Info: Device "NRF51822_XXAC" selected.  
> 
> JLink info:
> 
> ------------
> 
> 
> DLL: V5.12j, compiled Jul 18 2016
> 18:51:28
> 
> Firmware: J-Link
> OB-SAM3U128-V2-NordicSemi compiled Jul
> 5 2016 08:42:09
> 
> Hardware: V1.00
> 
> S/N : 681991810   
> 
> ***JLink Error: Communication timed out: Requested 20 bytes, received 0
> bytes ! Could not read hardware
> status!
> 
> Error: Flash Download failed  - 
> Target DLL has been cancelled
> 
> Flash Load finished at 11:51:53

I am attaching images of schematics and setup.

[Øyvind Karlsen]

Hi,

The nRF51 DK has an interface MCU that by default is flashed with a JLINK bootloader, and will not accept mbed devices. You must flash the mbed bootloader onto the chip, to do so follow the instructions under Firmware Update here.

Best regards,

Øyvind

[Yatin Varachhia]

Hi Oyvind,

Loaded the Mbed firmware. But, it doesn't program the board. Only change has happened is that mbed interface doesn't give fail message.

What should be voltage at SWDIO and SWDCLK pins when not programming. For me it is 2V (with VCC=3.3V). Do you think something is wrong in hardware ?