Re: How to enable DMA transfers for UART?
Li, Jun R
I've ever implemented a DMA-enabled UART on STM32F4 boards, but based on much old version of zephyr. I can try rebasing it to the latest zephyr if you are interested.
On 3/19/19, 08:18, "email@example.com on behalf of Stefan Jaritz" <firstname.lastname@example.org on behalf of email@example.com> wrote:
I am currently experimenting with ZephyrOS on different tasks. My base
is an own dev board which has a stm32f4xx MCU that connects different
ICs etc. via UART, I2C, SPI & GPIOs.
Currently the UART ISR is too slow to catch all chars at a rx burst.
Usually I am using UART + DMA transfers to relieve the MCU and save energy.
I checked the UART stm32 api and saw that it is not utilizing things
like uart DMA transfers. But there is an complete DMA API available.
Yeah! Now I looked at the sample section to get a blueprint for doing
so. Ups! Nothing
So I am asking for help or some example how to do an UART & DMA.
Think having an ringbuffer for rx and an intr firing after n Bytes
received via DMA. Also doing the tx via DMA would be perfect. Any ideas
to setup the Zephyr drivers to do so?
PS: there is an nice article on that here