SPI baud rate

[hardwaredevelop]

I tested the MQX SPI example in folder MQX/examples/spi. I used the Vybrid pcm052 board / M4 processor. I changed the baud rate to 1000. I read back the baud rate, it returned 1017 ... no problem here.

On the scope, I measure a clock rate of 2600 Hz which gives 333 byte/s (1/2600 * 8bit). I'm a little bit confused.

Can anybody explain me why ?

[RadekS]

Are you sure, that bus clock at your board has right value?

I suppose that you used twrvf65gs10 BSP as base for your own BSP. Correct?

Unfortunately I was not able found value of external crystal/resonator at pcm052 board.

Main oscillator at twrvf65gs10 has clock 24MHz. Ratio between set and generated baudrate is approximately 2.5~2.6. This leads to 62MHz crystal at your board or some different clock settings. Is it possible?

I hope it helps you.

Have a great day,
RadekS

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