Raspberry Pi достаточно хорошо себя зарекомендовала у радиолюбителей.
В этой теме я предполагаю собирать данные по дополнительным платам для Pi.
TNC-Pi - AFSK-модем для Pi
DV3000 - плата вокодера AMBE3000
RasPi DV AVR - GMSK-модем на базе CMX589A
Raspberry Pi Add-ons
Moderator: BM Administration
Re: Raspberry Pi Add-ons
А эти платы GMSK, подключающиеся к GPIO, они поддерживаются софтом от G4KLX?
Re: Raspberry Pi Add-ons
RasPi DV AVR - да. Просто RasPi DV - нет.RA1AIE wrote:А эти платы GMSK, подключающиеся к GPIO, они поддерживаются софтом от G4KLX?
R3ABM / DL5ABM / ex. UB3ABM
Raspberry Pi Add-ons
Кстати, в порядке оффтопика.
Наткнулся тут на интересный пост про Pi в одной из групп... ![Подмигивает ;)](./images/smilies/icon_e_wink.gif)
![Подмигивает ;)](./images/smilies/icon_e_wink.gif)
![Подмигивает ;)](./images/smilies/icon_e_wink.gif)
When i wrote that it's a graphics card with attached usb controller,
i wasn't joking. The processor on the rpi was originally designed
as a test system to verify the graphics core on real workload.
To interface it to the outside world, they decided to use USB.
For unknown reasons they decided to use an arm9 core with a bit
of glue logic as USB controller (the best guess i've heard sofar
is, that they would have had to pay for a real USB controller,
while an old arm core like that costs (almost) nothing if you
buy a big/new one anyways).
This is the reason why there are no I2C or SPI interfaces,
and everything needs to be bitbanged (aka, you write single
bits to outputs in software and poll whether anything changes
on the inputs). Or that the "USB controller" generates an
interrupt every 125us that _must_ be handled imediatly
(the arm core has to set up the next USB microframe otherwise
USB stops working).
That is also the reason why Eben Upton got it so cheaply. Apparently,
broadcom had produced quite a few of those (couple thousand, don't ask
me why). And there was no risk that anyone would buy those (for above
reasons, they were never intended to be sold). Also, the mask set
(the most expensive part of chip production) was already there and
amortized by other means, so producing more wouldn't cost much either.
Raspberry Pi Add-ons
А что тут интересного ?
Дешево и без чудес...
Дешево и без чудес...
UA3ATQ wrote:Кстати, в порядке оффтопика.Наткнулся тут на интересный пост про Pi в одной из групп...
When i wrote that it's a graphics card with attached usb controller,
i wasn't joking. The processor on the rpi was originally designed
as a test system to verify the graphics core on real workload.
To interface it to the outside world, they decided to use USB.
For unknown reasons they decided to use an arm9 core with a bit
of glue logic as USB controller (the best guess i've heard sofar
is, that they would have had to pay for a real USB controller,
while an old arm core like that costs (almost) nothing if you
buy a big/new one anyways).
This is the reason why there are no I2C or SPI interfaces,
and everything needs to be bitbanged (aka, you write single
bits to outputs in software and poll whether anything changes
on the inputs). Or that the "USB controller" generates an
interrupt every 125us that _must_ be handled imediatly
(the arm core has to set up the next USB microframe otherwise
USB stops working).
That is also the reason why Eben Upton got it so cheaply. Apparently,
broadcom had produced quite a few of those (couple thousand, don't ask
me why). And there was no risk that anyone would buy those (for above
reasons, they were never intended to be sold). Also, the mask set
(the most expensive part of chip production) was already there and
amortized by other means, so producing more wouldn't cost much either.
С уважением, Сергей.
Raspberry Pi Add-ons
Да все же скорее "с чудесами"...R2AJV wrote:Дешево и без чудес...
![Подмигивает ;)](./images/smilies/icon_e_wink.gif)
![Подмигивает ;)](./images/smilies/icon_e_wink.gif)
Raspberry Pi Add-ons
В дстаре еще не пробовал, но у нас в аналогичной сети в аналогеUA3ATQ wrote:Да все же скорее "с чудесами"...R2AJV wrote:Дешево и без чудес...Стало понятно почему такое убожество по периферии. Это был тестовый кристалл, сделанный по минимуму. А его от помойки спасли и сделали игрушку для школяров.
![Улыбается :)](./images/smilies/icon_e_smile.gif)
![Улыбается :)](./images/smilies/icon_e_smile.gif)
С уважением, Сергей.