[TriEmbed] new $4 Raspberry Pi

[Rodney Radford]

Scroll down to the section titled "THE PIO: NEVER BITBANG AGAIN" in the
hackaday article Raspberry Pi Enters Microcontroller Game With $4 Pico |
Hackaday
<https://hackaday.com/2021/01/20/raspberry-pi-enters-microcontroller-game-with-4-pico/>
as
it does a great job of an overview.

Basically each PIO is a small state machine with it's own register, GPIO
mapping, IRQ and DMA for building timing specific I/O code. Examples given
were another uart, or a uart with specific coding, the ws2811 protocol,
etc. While each of these can be done on the eps8266/esp32, the nice thing
is it is done by specialized hardware in the background so does not take up
any MPU cycles. Think of it as a simple cpld/fpga state machine built in to
the same chip.



On Thu, Jan 21, 2021 at 9:16 AM Mauricio Tavares via TriEmbed <
triembed at triembed.org> wrote:

> On Thu, Jan 21, 2021 at 9:01 AM Rodney Radford via TriEmbed
> <triembed at triembed.org> wrote:
> >
> > And after I sent that, I read more about the programmable PIO on the
> chip and that opens up a lot of other options that make it a better choice
> for some options over the esp8266 and esp32.
> >
>       Could you explain the difference to clueless me?
> >
> > On Thu, Jan 21, 2021 at 8:58 AM Rodney Radford <ncgadgetry at gmail.com>
> wrote:
> >>
> >> The biggest competitors will be the esp8266 and esp32 that offer
> similar specs but already include wifi and a big user following, so that
> may be a hard sale - especially considering the very low prices of some of
> the variants direct from China now.
> >>
> >> On Thu, Jan 21, 2021 at 8:50 AM Mark Sidell via TriEmbed <
> triembed at triembed.org> wrote:
> >>>
> >>> Of course, it's not exactly a pi. More like a pi-ish Arduino, perhaps.
> Hackaday did a nice write-up:
> https://hackaday.com/2021/01/20/raspberry-pi-enters-microcontroller-game-with-4-pico/
> >>>
> >>> On Thu, Jan 21, 2021 at 8:21 AM John Vaughters via TriEmbed <
> triembed at triembed.org> wrote:
> >>>>
> >>>> competition for arduino?
> >>>>
> >>>> 3 ADCs is nice and super flexible I/O definition possibilities.
> >>>>
> >>>> all for $4
> >>>>
> >>>> very impressive.
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> On Thursday, January 21, 2021, 8:07:32 AM EST, Pete Soper via
> TriEmbed <triembed at triembed.org> wrote:
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> https://www.raspberrypi.org/products/raspberry-pi-pico/
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> Pete
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
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