- LPC5502 - can not trigger an SPI DMA transfer from CTimer0

nico_2451 — Fri, 27 Sep 2024 21:06:05 GMT

Hello,
I am a beginner with NXP MCUs. I have a task that I cannot solve.

So, I want to configure CTimer0 Match0 to trigger the DMA to transfer data over SPI every 100 microseconds. From the user manual, as far as I can understand, this should be possible. However, I can't achieve it. Could someone create a simple project that does this?

kind regards

Re: - LPC5502 - can not trigger an SPI DMA transfer from CTimer0

Alice_Yang — Sun, 29 Sep 2024 09:21:24 GMT

Hello @nico_2451

There is a demo about SPI+DMA ''spi_dma" under LPC5506 SDK, it uses software trigger.

You can add Ctimer MATCH trigger based on it. About CTIMER trigger SPI, you can refer to:

https://community.nxp.com/t5/LPC-Microcontrollers-Knowledge/DMA-triggering-function-Demo-for-LPC55xx-From-CTimer0-match0/ta-p/1468144

https://community.nxp.com/t5/LPC-Microcontrollers/CTIMER-DMA-requests-triggers-pacing-the-transfers/m-p/1088948

Hope it helps.

Alice

LPC Microcontrollersのトピック- LPC5502 - can not trigger an SPI DMA transfer from CTimer0

- LPC5502 - can not trigger an SPI DMA transfer from CTimer0

Re: - LPC5502 - can not trigger an SPI DMA transfer from CTimer0