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MSZB · 2024-01-11

On a STM32H745ZI-Q - Board I want to create periodical 4-byte SPI transfers triggered by a timer. So far I got this working the following way:TIM triggers DMADMA initiates the SPI transfer.However, the SPI transfer timing (CS low) has a high jitter ...

MSZB · 2024-01-16

> At least for some other H7s (H723, 725, 733, 735) the 960 MHz after DIVN1 would be too much.> Maybe you are above the limit and CubeMX doesn't recognize it?For H745 the limit is 960 MHz (from STM32H745xI/G, table 59)

MSZB · 2024-01-16

HSE is used, 8 MHz MCO from ST-LINK. It's jitter is roughly 1 ns.The jitter of the TIM12 output, which triggers the DMA, is ca. 40 ns (!). Maybe I'll have too look at the supply configuration in more detail. The board runs in Supply Config 3 (Intern...

MSZB · 2024-01-15

Delay is no problem. Jitter is.

MSZB · 2024-01-15

It's about the jitter from one SPI transmission to the next and in relation to a PWM signal. I.e. T and Td in the drawing below must be jitter free (< 5 ns) for all periods.

MSZB · 2024-01-15

Thanks for all the suggestions so far. Before trying these - back to the original question:Is it possible to the trigger transfer start of the SPI peripheral directly by a timer TRGO, without having to generate the SPI timings (SCK and/or CS) by time...

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STM32H7 periodical TIM triggered SPI transfer w/o DMA?

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Re: STM32H7 periodical TIM triggered SPI transfer w/o DMA?

Re: STM32H7 periodical TIM triggered SPI transfer w/o DMA?