what is the CPU speed of nRF52832?

[Ellison]

Hello,

what is the CPU speed of nRF52832?

I'd like to test if the NRF52832 is running at 32MHz or 64MHz.

I used it to run a compression algorithm, which took 8ms to run.Then I used another chip, the ARM Cortex-M4 32-bit processor core operating at 120 MHz frequency with a running time of 2.3ms.

The NRF52832 is running at 32MHz.Because 120/32 is exactly the ratio of their running time.

Best regards,

Ellisonn

[Ellison]

Feels like my NRF52832 is not running on 64MHz

[Vidar Berg]

Hello,

Yes, the CPU clocked is fixed at 64Mhz. Maybe the instruction cache is disabled ( ICACHECNF )? Cache is enabled automatically when you use the Softdevice, but not otherwise.

Best regards,

Vidar

[Ellison]

To enable the instruction cache.To make the CPU run the fastest.

[Vidar Berg]

To enable instruction cache you can add the following line to your startup code:

    /* I-Code cache enable */
    NRF_NVMC->ICACHECNF = (NVMC_ICACHECNF_CACHEEN_Enabled << NVMC_ICACHECNF_CACHEEN_Pos);