how to use a 32M crystal

[robben]

hello , my IDE is keil and the sdk is nRF51_SDK_10. i know the system is 16M frequency,but now i only have 32M crystal.How can i change the sdk if i wang to run the system? (i have change the file "system_nrf.c",change this "#define __SYSTEM_CLOCK (16000000UL) " to "#define __SYSTEM_CLOCK (32000000UL) ",but the system can"t run,who can tell me where should i change? sos)

[Stefan Birnir Sverrisson]

Hi robben

This thread might help

[robben]

yes ,now i add "NRF_CLOCK->XTALFREQ = 0xFFFFFF00;"to file main.c success. But the 32M crystal don`t work . I use a oscilloscope to measure the crystal and i can see nothing.

[Stefan Birnir Sverrisson]

Hi robben

I updated the linked thread with more detailed information on how to enable 32MHz crystal. Try to follow it and report your results.

[Stefan Birnir Sverrisson]

If it still does not work, can you inform what nRF51 chip revision you have and what load capacitors you have chosen for the 32MHz crystal?