I have compared the SAMv7 SPI XDMAC to SAMA5, and checked the PR and dcache
suggestions from Simon Filgis and only found one discrepancy::
SAMA5 had DMACH_FLAG_MEMBURST_4 compared to SAMv7 which had
DMACH_FLAG_MEMBURST_1.
I won't profess to understand the detailed significance, but DMA does now
Hello world :-)
=== Short Story Long ===
I have just created my first custom board configuration based on
ESP32DevkitC. Both application and board configuration is external to
the nuttx.git and nuttx-apps.git (these are git submodules of my
project).
>From what I can see the board definition for
Hi Tomek,
On 5/18/23, Tomek CEDRO wrote:
> Hello world :-)
>
> === Short Story Long ===
>
> I have just created my first custom board configuration based on
> ESP32DevkitC. Both application and board configuration is external to
> the nuttx.git and nuttx-apps.git (these are git submodules of my
>
On Thu, May 18, 2023, 11:53 AM Alan C. Assis wrote:
> I don't think you can get ws2812 working directly using a GPIO over
> bitbang, the protocol used by this chip is very time sensitive.
> Actually even in SPI mode I failed to get it working, I tried it on
> stm32f103-minimum and stm32f4discover
On 5/18/23, Tomek CEDRO wrote:
> Hello world :-)
>
> === Short Story Long ===
>
> I have just created my first custom board configuration based on
> ESP32DevkitC. Both application and board configuration is external to
> the nuttx.git and nuttx-apps.git (these are git submodules of my
> project).
On 5/18/23, Brennan Ashton wrote:
> On Thu, May 18, 2023, 11:53 AM Alan C. Assis wrote:
>
>> I don't think you can get ws2812 working directly using a GPIO over
>> bitbang, the protocol used by this chip is very time sensitive.
>> Actually even in SPI mode I failed to get it working, I tried it o
On Thu, May 18, 2023 at 8:53 PM Alan C. Assis wrote:
> Hi Tomek,
>
> I don't think you can get ws2812 working directly using a GPIO over
> bitbang, the protocol used by this chip is very time sensitive.
> Actually even in SPI mode I failed to get it working, I tried it on
> stm32f103-minimum and st
On Thu, May 18, 2023 at 8:59 PM Brennan Ashton wrote:
> I tested it on an nRF52 but I think others have use STM32. It is
> particular since we are abusing SPI for something that looks kind of like
> SPI. I recommend using a logic analyzer to verify the waveform on the wire
> if debugging this.
T
On Thu, May 18, 2023 at 9:31 PM Tomek CEDRO wrote:
> 2. WS2812 timing pains. I know it is possible to drive WS2812 from
> ESP32 because I have done that already on MicroPyhon both with GPIO
> bitbang and even better with RMT peripheral that makes it walk in the
> park (we can make one for NuttX!!)
On Thu, May 18, 2023 at 9:13 PM Alan C. Assis wrote:
> There is also the RMT driver from Victor Benso:
> https://www.youtube.com/watch?v=rmOh9iGzwtk
> He submitted a PR to mainline: https://github.com/apache/nuttx/pull/6992
> Maybe you can work with him to fix the remaining issue and get it merged
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