Need to be clear urgency NRF52832 baud rate

RE: Need to be clear urgency NRF52832 baud rate

Vidar Berg — Mon, 18 Feb 2019 09:57:22 GMT

Not that I'm aware of. You need to measure the pulse width/time period when data is transmitted to determine the actual baudrate.

RE: Need to be clear urgency NRF52832 baud rate

Venkatesan — Mon, 18 Feb 2019 09:51:36 GMT

yea will try that.

Is there any tool to calculate the error??

RE: Need to be clear urgency NRF52832 baud rate

Vidar Berg — Mon, 18 Feb 2019 09:20:48 GMT

It was from some simulation values I had, but not sure what the division error is unfortunately. That is why wanted you to verify the baudrate by sampling the output signal and tune the baudrate register accordingly. Remember to start the HF crystal before measuring.

EDIT: It looks like the actual baudrate will become 5785 when you set the register to 0x17B000. I.e. a division error of ~0.04% percent. But please verify.

RE: Need to be clear urgency NRF52832 baud rate

Venkatesan — Mon, 18 Feb 2019 09:10:20 GMT

Also how about the error rate % ??

RE: Need to be clear urgency NRF52832 baud rate

Venkatesan — Mon, 18 Feb 2019 08:59:57 GMT

Thank u for the immediate response.

can i know how did u get this value??

RE: Need to be clear urgency NRF52832 baud rate

Vidar Berg — Mon, 18 Feb 2019 08:50:55 GMT

Try 0x17B000

RE: Need to be clear urgency NRF52832 baud rate

Venkatesan — Mon, 18 Feb 2019 08:49:57 GMT

As per the provided thread

The formula is: Baudrate = desired baudrate * 2^32 / 16000000

=5787*4294967296/16000000

=5787*268.435456

= 1553435.983872

Baudrate of 5787 should then be 15534356 decimal =0x ED0914

then how to roundoff the value??for proceed further??Please help

RE: Need to be clear urgency NRF52832 baud rate

Vidar Berg — Mon, 18 Feb 2019 08:27:13 GMT

Hi,

You can find a simplified formula in this thread (link). Note that you need to account for clock source accuracy (HFINT vs HFXO) in addition to any division error on the baudrate generator. I'd suggest that you use a logic analyzer or oscilloscope to measure the actual baudrate.