SPI time between sending the register address and obtaining the data

RE: SPI time between sending the register address and obtaining the data

jmf24 — Mon, 09 Dec 2019 03:59:04 GMT

dolrairom I apologize, this comment will not be an answer to your question, but I'm wondering if you were able to get this working? I am currently trying to interface with the pmw 3610 sensor and am unable to find much of any information on it. You mentioned a datasheet you had for it specified 4us between address specification and reading data. Can you provide a link to said datasheet or any other SPI parameters you have configured here? I purchased a module for this sensor online and no information was provided with it. I've tried to search for the relevant datasheets online and the only one that I can find merely states that it is 3-wire SPI and what the registers are, but provides nothing else as far as the communication parameters (SPI mode, MSB vs LSB, timing requirements (ie. 4us above), etc.). I've had a heck of a time trying to get any sort of reading from this module, and unfortunately reaching out to Pixart directly has not been very fruitful either.. Any help is greatly appreciated.

RE: SPI time between sending the register address and obtaining the data

Patrick — Mon, 05 Aug 2019 10:24:15 GMT

I believe you are correct. I did not realize at the time I replied to you. Apologies for the misdirection.

RE: SPI time between sending the register address and obtaining the data

dolrairom — Mon, 05 Aug 2019 07:34:23 GMT

Hi Patrick. I have been taken a look to what you said and (correct me if I'm wrong) I think the extended config struct is not able for nrf52832. I tried to configure it but it seems to be just for pca10056(nrf52840) not for pca10040 (the one with nrf52)

RE: SPI time between sending the register address and obtaining the data

Patrick — Thu, 01 Aug 2019 16:45:06 GMT

I don't see a lot of detail but it looks like there may be a delay rx parameter you can use in the extended config struct. Take a look here.

RE: SPI time between sending the register address and obtaining the data

awneil — Thu, 01 Aug 2019 15:06:47 GMT

Yes - you're going to have to manually code

A transfer to send the address
A delay
A transfer to red the data