How to change GPIO o/p voltage level to 3.3V,by default i got 1.8V only

[shadab]

Hi 

I made custom board with nrf52820 chip providing 5V as input but I got 1.8v only on my GPIO pin .I want to change it to 3.3.How to change it

[Jørgen Holmefjord]

Hi,

See GPIO levels in the product specifications. Using nrfjprog, you can configure the GPIO voltage level to 3.3V using the following commands:

nrfjprog --memwr 0x10001304 --val 5
nrfjprog -r

Best regards,
Jørgen