Please create an issue on github, I can add Donny or other people to ask
your question.
On Wed, Oct 16, 2024 at 1:27 AM Felipe Moura Oliveira <moura....@gmail.com>
wrote:
> Hello Xiang Xiao,
>
> Can you connect me with Donny or can you help me to understand spi_slave
> semaphore "unlock" ?
>
> Looking into spi_slave_driver.c:330
> while (priv->rx_length == 0)
> {
> remaining_words = SPIS_CTRLR_QPOLL(priv->ctrlr);
> if (remaining_words == 0)
> {
> spiinfo("All words retrieved!\n");
> }
> else
> {
> spiinfo("%zu words left in the buffer\n", remaining_words);
> }
>
> if (priv->rx_length == 0)
> {
> nxmutex_unlock(&priv->lock);
> if (filep->f_oflags & O_NONBLOCK)
> {
> return -EAGAIN;
> }
>
> ret = nxsem_wait(&priv->wait);
> if (ret < 0)
> {
> return ret;
> }
>
> ret = nxmutex_lock(&priv->lock);
> if (ret < 0)
> {
> spierr("Failed to get exclusive access: %d\n", ret);
> return ret;
> }
> }
> }
>
> we have:
> ret = nxsem_wait(&priv->wait);
>
> I think read operation will be locked until the function spi_slave_notify
> has been called, but I cannot find any call of SPIS_DEV_NOTIFY in nuttx
> repo. Did you have different implementation in your side ?
>
> Em ter., 15 de out. de 2024 às 12:28, Felipe Moura Oliveira <
> moura....@gmail.com> escreveu:
>
> > Hello All,
> >
> > I did a dummy question, in master branch, spi slave implementation
> already
> > blocked until new data is available. I wasn't working in the master
> branch
> > but I will switch to.
> >
> > Em ter., 15 de out. de 2024 às 11:45, Felipe Moura Oliveira <
> > moura....@gmail.com> escreveu:
> >
> >> Hello Xiang Xiao,
> >>
> >> thanks for sharing with me about rpmsg, to be honest it is new for me
> =/,
> >> I was locked in baremetal for several years. For now I cannot use it
> >> because my host mcu is running baremetal (maybe in the future we will
> >> change it). I developed a simple protocol using ack and nak whey to
> handle
> >> communication with master and slave. About "lock" my app until data is
> >> available, I am thinking use semaphore to wait to do it, so my solution
> >> will be able to sleep my mcu until spi releases it.
> >>
> >> Em ter., 15 de out. de 2024 às 11:24, Xiang Xiao <
> >> xiaoxiang781...@gmail.com> escreveu:
> >>
> >>> Yes, we use DMA for both SPI master/slave, but DMA is more related to
> the
> >>> driver not the framework.
> >>>
> >>> On Tue, Oct 15, 2024 at 2:08 PM Tomek CEDRO <to...@cedro.info> wrote:
> >>>
> >>> > One question by the way someone asked me recently - can NuttX SPI
> Slave
> >>> > work in DMA mode? :-)
> >>> >
> >>> > --
> >>> > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
> >>> >
> >>>
> >>
> >>
> >> --
> >> *Felipe Moura de Oliveira*
> >> *Universidade Federal de Minas Gerais*
> >> Linkedin <https://www.linkedin.com/in/felipe-oliveira-75a651a0>
> >> <https://twitter.com/FelipeMOliveir?lang=pt-br>
> >>
> >
> >
> > --
> > *Felipe Moura de Oliveira*
> > *Universidade Federal de Minas Gerais*
> > Linkedin <https://www.linkedin.com/in/felipe-oliveira-75a651a0>
> > <https://twitter.com/FelipeMOliveir?lang=pt-br>
> >
>
>
> --
> *Felipe Moura de Oliveira*
> *Universidade Federal de Minas Gerais*
> Linkedin <https://www.linkedin.com/in/felipe-oliveira-75a651a0>
> <https://twitter.com/FelipeMOliveir?lang=pt-br>
>
