How to send more then 8 frames via SPI

Marconi_ — Sun, 28 Apr 2024 09:33:45 GMT

Dear all,

Using LPCXPresso55S28 board I try to send 16 bit data via SPI.

I'm using FLEXCOMM2 and I connected my locical analyzer to the board using the pins:

- P18 [15] -> MOSI

- P18 [18] -> SSEL0

- P18[8] -> SCK

Using MCUXpressoIDE peripherals configurator I configured FLEXCOMM2 as shown in the picture

I wrote a very simple program to test SPI functionality. It uses an infinite loop where the variable dato is incremented by one and the following routine is called each iteration to send the incremented value over SPI.

SPI_WriteData(FLEXCOMM2_PERIPHERAL, dato, kSPI_FrameDelay | kSPI_FrameAssert);

Then I compiled my program successfully and flashed it to the evaluation board. I observed the output SPI signals using my logic analyzer and noticed that only 8 frames were sent correctly.

The clock of the 9th is not correct, the CS signal remains low and MOSI remains high.

I'm using MCUXpresso IDE v11.8.1_1197 whith SDK_2.x__LPCXpresso55S28 version 2.13.0

Did you have a similar problem?

How did you fixed it ?

Thank you very much for your help and cooperation

regards

Re: How to send more then 8 frames via SPI

Alice_Yang — Mon, 29 Apr 2024 08:13:42 GMT

Hello @Marconi_

How about firstly test the SPI demo under SPI. Does it can work well on your board?

Please contact us if have any issue.

Alice

Re: How to send more then 8 frames via SPI

Marconi_ — Mon, 29 Apr 2024 09:21:37 GMT

SPI SDK demo example works fine. Unfortunately it doesn't use SPI_WriteData function,

regards

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How to send more then 8 frames via SPI

Re: How to send more then 8 frames via SPI

Re: How to send more then 8 frames via SPI