hx711 routines using in ant bike powe rmeter example

RE: hx711 routines using in ant bike powe rmeter example

bronsus — Tue, 27 Oct 2020 11:07:27 GMT

Thanks now it works. Thank you very much for your excellent support!

RE: hx711 routines using in ant bike powe rmeter example

Kenneth — Tue, 27 Oct 2020 10:56:57 GMT

Try to compile hx711 with optimization enabled.

Best regards,
Kenneth

RE: hx711 routines using in ant bike powe rmeter example

bronsus — Tue, 27 Oct 2020 09:22:29 GMT

I just changed the interrupt level to 2 and also tried 3, but no changes, :(

RE: hx711 routines using in ant bike powe rmeter example

Kenneth — Tue, 27 Oct 2020 08:49:46 GMT

You are right that the softdevice can interrupt the application as for instance shown here:
https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/processor_avail_interrupt_latency/exception_mgmt_sd.html

Using interrupt level 2 and 3 may be better than using 5, 6 or 7 for application timing critical events.

The timing should be similar to BLE, so it is in the order of 60-70us for softdevice timing critical events (level 0 and 1):
https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/ble_processor_avail_interrupt_latency/ble_peripheral_connection_performance.html

RE: hx711 routines using in ant bike powe rmeter example

bronsus — Tue, 27 Oct 2020 07:37:49 GMT

Hi Kenneth, thanks for your quick reply which helped me. I changed GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS from4 to 6 and now there is no memory error any longer.

But now I am facing a new problem.

Th hx_sample () routine always comes back with Data_Error. I set some Debug Points and figured out that m_sample.count = 20, which says me that the readout has been interrupted by an Interrupt, probably by the softdevice. Normally the m_sample.count should be 24 when everything has been read out.

Any ideas ?

RE: hx711 routines using in ant bike powe rmeter example

Kenneth — Mon, 26 Oct 2020 13:30:53 GMT

The easiest should be to start with the ANT example (which use the softdevice) and then include the peripheral drivers and code into the ANT example, rather than the other way around. For instance the ANT example is configured with SOFTDEVICE_PRESENT in the preprocessor symbols which is used by the peripheral drivers, you would need to copy all the defines sdk_config.h to the ANT example.

If nrf_drv_gpiote_in_init() return NRF_ERROR_NO_MEM, then I suspect you should increment GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS in sdk_config.h