[PATCH 0/2] bsp/atsam: Merge USART and UART code and add optional Rx DMA

[Christian MAUDERER]

Am 14.01.22 um 17:52 schrieb Gedare Bloom:
> BSP-specific looks ok to me. Back port to 5 is also fine as bugfix.

Thanks.

> 
> On Thu, Jan 13, 2022 at 12:38 AM Christian Mauderer
> <christian.mauderer at embedded-brains.de> wrote:
>>
>> Hello,
>>
>> the UART/USART of the ATSAM doesn't have any FIFO buffer. Therefore
>> every received character has to be processed before the next one
>> arrives. In situations with a high interrupt load or during long
>> interrupt locks, this might not work reliable and the UART/USART can
>> loose characters.
>>
>> This patch set first merges the USART and UART code on the ATSAM. The
>> code was identical except for very few lines. After that it adds an
>> option to enable a DMA for the Rx path.
>>
>> The DMA is a limited resource on this chip so I didn't enable the usage
>> of the DMA by default. It has to be explicitly enabled with an ioctl
>> call on an opened port. With that existing applications shouldn't note a
>> difference and applications that have difficult load situations can
>> enable the DMA.
>>
>> The problem exists in 5 and 6. I would like to add the patch for both
>> branches (tickets #4577 and #4578).
>>
>> Best regards
>>
>> Christian
>>
>>
>> _______________________________________________
>> devel mailing list
>> devel at rtems.org
>> http://lists.rtems.org/mailman/listinfo/devel

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