SPI delay betwen byte

RE: SPI delay betwen byte

Fb62 — Tue, 21 Sep 2021 11:50:15 GMT

Hi Sigurd,

thanks a lot for your help, I have reprogrammed the DK and now works.

I Have tested your example and work perfect and I have noted tha the buffer of SPI is 255 bytes.

I found why in my application i see a pause 2 uS every byte , because in overlay file i have this code

&spi2 {
compatible = "nordic,nrf-spi";
status = "okay";
label ="SPI_2";
sck-pin = <2>;
mosi-pin = <3>;
miso-pin = <4>;
cs-gpios = <&gpio0 25 0>;
};

I have changed "nordic,nrf-spi" to "nordic,nrf-spim" and now work well.

Thanks

Fausto

RE: SPI delay betwen byte

Sigurd — Fri, 17 Sep 2021 08:19:28 GMT

Hi Fausto,

[quote user="Fb62"]unfortunately my nRF52-DK doesn't work anymore,[/quote]

This post might be helpful in recovering it: https://devzone.nordicsemi.com/f/nordic-q-a/24592/my-nrf52-nrf51-dk-kit-doesn-t-work/

[quote user="Fb62"]it is possible to have the test code you did, so when I get the new DK, I also try your code.[/quote]

Attachment: devzone.nordicsemi.com/.../8053.spi_5F00_test.rar

PS: You might have been affected by this nRF52832 errata: https://infocenter.nordicsemi.com/index.jsp?topic=%2Ferrata_nRF52832_Rev2%2FERR%2FnRF52832%2FRev2%2Flatest%2Fanomaly_832_58.html

RE: SPI delay betwen byte

Fb62 — Wed, 15 Sep 2021 14:11:03 GMT

Hi Sigurd,

it is possible to have the test code you did, so when I get the new DK, I also try your code.

Thanks

Fausto

RE: SPI delay betwen byte

Fb62 — Wed, 15 Sep 2021 14:05:27 GMT

SDK 1.6.1

RE: SPI delay betwen byte

Fb62 — Wed, 15 Sep 2021 14:03:52 GMT

HI, Sigurd,

unfortunately my nRF52-DK doesn't work anymore,

I think the PCA10040 is broken (power and clock is ok, but the pc doesn't recognize it anymore).

So I can't send you a photo of the spi transmission with the delays.

I bought a new nRF52-DK, from mouser, as soon as I get it I redo the test and send a photo.

What I see on my analyzer doesn't look like your measurement at all, where the clock is continuous.

In my transmission the clock stops after 8 bits, pausing for 2 microseconds, to resume for the transmission of the next byte, and so on.

I am using nRF52832 with Zephyr 1.6.1 whit Segger, what version did you use to do this test?

Thank you,

Fausto

RE: SPI delay betwen byte

Sigurd — Wed, 15 Sep 2021 13:42:29 GMT

[quote user="Fb62"] it's the same delay of 2 uS .[/quote]

How are you measuring this?

I tried reprodcuing it, but I'm seeing 1 µs on the logic analzyer:

RE: SPI delay betwen byte

Fb62 — Tue, 14 Sep 2021 12:39:49 GMT

Hi it's the same delay of 2 uS .

What is the default cpu clock, it's possible increase it?

regards

Fausto

RE: SPI delay betwen byte

Sigurd — Tue, 14 Sep 2021 08:38:03 GMT

Hi,

[quote user=""]uint16_t fBuffer[5760];[/quote]

Try using uint8_t instead.