Taiyo Yuden EYSHJNZXZ (nRF52832) not working when using softdevice

RE: Taiyo Yuden EYSHJNZXZ (nRF52832) not working when using softdevice

NewAce — Mon, 20 Mar 2017 13:41:40 GMT

Good point! In that case the define would be NRF_LF_SRC_RC.

RE: Taiyo Yuden EYSHJNZXZ (nRF52832) not working when using softdevice

FormerMember — Mon, 20 Mar 2017 13:31:26 GMT

Another option is to use the internal RC oscillator instead of the synthesized clock. The synthesized clock requires the 32 MHz crystal to run all the time, while the RC oscillator doesn't. The RC oscillator will therefore use less current.

RE: Taiyo Yuden EYSHJNZXZ (nRF52832) not working when using softdevice

NewAce — Mon, 20 Mar 2017 13:22:13 GMT

Hello Kristin,

Thanks for the feedback. For the benefit of others, when using MBED (OS5), I determined that the define MBED_CONF_NORDIC_LF_CLOCK_SRC needed to be changed to NRF_LF_SRC_SYNTH so that it derives a 32KHz clock from the 32MHz crystal. This seems to work for all MBED examples, including "blinky" and "ble-LED".

targets.json: (MCU_NRF52 section)

"config": {
            "lf_clock_src": {
                "value": "NRF_LF_SRC_SYNTH",
                "macro_name": "MBED_CONF_NORDIC_NRF_LF_CLOCK_SRC"
            },

...

RE: Taiyo Yuden EYSHJNZXZ (nRF52832) not working when using softdevice

FormerMember — Mon, 20 Mar 2017 08:15:13 GMT

All the SDK examples are set up to by default use external 32 kHz crystal. If the modules doesn't have an external 32 kHz crystal, you need to change the LFCLK clock source in ble_stack_init().