ChibiOS Free Embedded RTOS

Thanks for reply,

If your CPU uses the UART2 driver, I use a modified version which gives the option of using only interrupts for the UART transfers - well tested in some specific configurations.
Not quite what you're asking, but might solve the problem in a slightly different way.

Unfortunately ...

Any chance UART driver will be split into Receive or Transmit only? Because this will save DMA to another purpose if our project is very complex.
Receive only mcuconf.h will be like this,


#define STM32_UART_USART1_RX_DMA_STREAM STM32_DMA_STREAM_ID(2, 5)
#define STM32_UART_USART1_TX_DMA_STREAM OFF ...

Hi, Geoffroy

Maybe you need more than ChSysDisable(). You need to stop entire OS like this
http://wiki.chibios.org/dokuwiki/doku.php?id=chibios:howtos:stop_os

Tell us if you successful with this project,

Hi,

Those symbols are part of the startup files so it is a guess, probably it is related to linker garbage collector and/or LTO

after tried Giovanni suggestion, i build successfully but still error if build with -flto option. I compiled main.c with crt1.c, crt0_v7m.S and vectors.c.

Thanks,

Nice update !!

May i can help you with my oscilloscope?,
if your Oscilloscope not ready yet.

Arif,

Hi,

I'm trying DUAL DAC from TESTHAL but cannot get sine wave output.
I'm using STM32-F4 Discovery. Looks like this,
example.png

then after i see this note:
The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the ...

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

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,

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 ...