mbed with custom pcb

[Michael Dietz]

Hey,

For my project I wrote and tested (w/ nRF51 DK) all firmware in mbed. I also made a custom PCB w/ the nRF51822 CEAA chip based on the 4 layer reference design provided by Nordic.

The problem comes when I program my custom board w/ the mbed firmware. I can't even blink an LED. However when I program using code written in keil everything works. I use nRFgo studio w/ jlink to program the chip and when I program w/ mbed it shows the softdevice and application programming fine but nothing happens.

Any ideas?

Thanks!

[Stian Røed Hafskjold]

If you have an older chip revision for your custom board, it may not work if you are compiling against the nRF51 DK target in mbed which uses a nRF51422 QFAC revision 3 chip.

To see which chip revision you have: www.nordicsemi.com/.../29336623

Try to compile against this target instead: developer.mbed.org/.../

[Michael Dietz]

Hey,

I checked my chip and it is revision 1. However when I changed to target the eval board there is still nothing happening after I program the board.

Any ideas?

Thanks!

[RK]

Are you sure the MBED compiled firmware is being correctly uploaded to your board? How are you getting it on there, does your board appear as a Mass Storage Device or are you using Segger to upload MBED-compiled code to it?

Since you seem to be able to use JLink to connect to the custom board, have you tried dumping out the flash and ensuring that you do in fact have the code you expect on it. You could compare it to a similar dump of your DK after MBED programming. Check both your application code and the softdevice .. and the UICR whilst you're at it.

Other options, upload your MBED code, connect a JLink, halt, reset and go and then halt and find out where you are, that might possibly give you a clue as to what your board's up to.