ChibiOS Free Embedded RTOS

Hi,

My name is Arif,
I build a project and design PCB with STM32F407 using 4 Serial and 2 SPI. I forgot to open datasheet about DMA mapping,
I confusing about using SPI2 that DMA stream same location with UART3 and UART4. UART3 i used serial driver and not using DMA.
But, for UART4 i used uart driver for receive only, then i want to use STM32_DMA_STREAM_ID(1, 4) to SPI2_TX,
Any suggestions?

Thx, Arif

Hi,

You could use the "serial" driver instead of the UART driver, it does not use DMAs.

Giovanni

Hi Giovanni,

You could use the "serial" driver instead of the UART driver, it does not use DMAs

but i need DMA for UART4 receive and SPI2,

Any another solution?

Arif,

Another solution is to not use UART and SPI at the same time, you can start/stop drivers, DMAs are allocated/freed in start/stop.

Giovanni

Another solution is to not use UART and SPI at the same time, you can start/stop drivers, DMAs are allocated/freed in start/stop.

i'll try this first, thanks Giovanni.
Arif