RE: nrf52840 ds18b20

awneil — Thu, 01 Aug 2019 15:52:59 GMT

[quote userid="80955" url="~/f/nordic-q-a/50529/nrf52840-ds18b20"]i'd like to setup HW timer to generate 1us, but instead i got only 13us (1us expected).[/quote]

Show your code

[quote userid="80955" url="~/f/nordic-q-a/50529/nrf52840-ds18b20"]Is it possible to use dedicated HW timer to count delay for ds18b20[/quote]

I don't know for sure, but I suspect not.

As noted in your other thread, you'd probably be better off either using an external chip to do the timing, or faking it on the UART or SPI

https://devzone.nordicsemi.com/f/nordic-q-a/50426/nrf52840-ds18b20

One thing to note is that the 1-Wire timing is only critical within a bit timeslot - the timing between bits is completely non-critical.

The SoftDevice has a Timeslot API - which might be useful to schedule the 1-Wire bit timeslot into places where the radio won't interrupt...?

https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/concurrent_multiprotocol_tsl_api/radio_tsl_api.html