missing entries in F76x dma stream static check Topic is solved

[alex31]

Hello,

There is a little problem in os/hal/ports/STM32/STM32F7xx/stm32_registry.h file.
This file statically check that dma stream defined in mcuconf.h are valid.

Unfortunately, this file is correct for stm32F7[4,5]x family, but not for stm32F7[6,7] family
where each DMA engines has more channels (9 channels instead of 7 for DMA1, 11 channels instead of 7 for DMA2)

by example, I2C2_TX can use DMA1 STREAM4 on F76x, but not on F74x.

some channels are reserved for peripheral that HAL don't address, but there is I2C, SPI, SDMMC capable streams in these
additional channels.

What is the prefered way to patch, have a different registry for the two F7 families, of keep one file and play with #ifdef inside the file ?

thanks
Alexandre

[Giovanni]

Hi,

On the Reference Manual (RM0410) I only see 8 channels per DMA unit, are you sure?

Giovanni

[alex31]

I have found the new entries in the RM0410 Reference manual :
STM32F76xxx and STM32F77xxx advanced ARM®-based 32-bit MCUs

@ page 246/1896, DocID028270 Rev 2

I am working on a simple fix using #if for the peripheral that have additional entries for the F76/77 devices,
i'll post it here when it 'll be finished/tested

does the macro which use the xxxxx_DMA_CHN macro will manage nibble > 7 for the new channel between 8 and 11 ?

[alex31]

I have made a fix (in attachment) which :
° adds device reference in the #ifdef @beginning of stm_registry.h
° adds the channels for STM32F76xxx and STM32F77xxx device as seen on reference manual (see the attached file with the dma table extracted)
° modify the STM32_DMA_GETCHANNEL macro so that it can return channels coded on 4 bits instead of 3

I have successfully tested it using I2C2_TX on DMA1/STREAM4/CHANNEL8 on a F767.

I just have seen what could be a bug in RM410 documentation in DMA2 request mapping : SPI5_RX on STREAM5 is both on CHANNEL7 and CHANNEL9, so i have not added the CHANNEL9 entry is STM32_SPI5_RX_DMA_CHN since i don't understand how a the same stream could be on two different channels.

Alexandre

[Giovanni]

Hi,

I confused channel with stream... you are right, I will verify those macros.

Giovanni

[Giovanni]

Hi,

I committed a fix but I preferred to split sections in registry rather than having all those #ifs.

Could you confirm everything is fine?

Giovanni

[alex31]

Hello,

Could you confirm everything is fine?

Well, I am in my first day of easter holidays, on the highway, my wife driving. I have not F7 hardware with me,
but i can confirm that using new channels, it compiles now with master, and it wasn't before, so i am confident
that it works !

Thanks
Alexandre

[Giovanni]

OK, marking this as done

Giovanni