The nrf dongle has many stones on its hacking path.
- UICR.REGOUT has to be set to 3v3
Default to do so might brick it, and rescue needs high voltage jumpers switch explanation from Nordic here
Using the simplest pio, with my luck on falling over pio 0.10, of course it does not work, you need to set the UICR of NFCPINS PROTECT to disable.
- LEDS don't blink
although defined with the right functions LED1_G,... into pca10059.h, when using
bsp_board_led_on() indexes from 0 to nb leds have to be passed and not the led defines !!!
- Ground mass
without a bigger ground mass, the cpu keeps getting hard faults, so when debugging with swd I had to connect a usb charger without powering it on, just for bigger ground mass.