Re: Raspberry Pi, Real-Time and Ada

["Rego, P." <pvrego@gmail.com>]

Hello Dmitry,
On Thursday, February 6, 2014 5:44:03 AM UTC-3, Dmitry A. Kazakov wrote:
> Last time I checked there were ARM GPIO drivers for Linux, so I see no
> problem with RT except for possibly poor performance of the GPIO.
> It really depends rather on the hardware than the OS. In particular on how
> many AD/DA converters are physically present (to be shared between analogue
> inputs).
> Note that if you have, say, one AD multiplexed to four inputs, then no
> matter how RT your OS is, the latency between 1st and 4th inputs will be no
> less than 4 conversion times. Taking typical values 40us * 4 = 0.8ms. Now
> if inputs considered synchronous, this is also the jitter.
Ok.

> BTW, many boards do not even have all GPIO pins soldered. You should check
> if Raspberry Pi has ones you wanted to use.
Yes, that's a point. Yesterday I found out that it does not have. I needed to use some PWM outputs, but RPi only exposes one, so I will have to use some timers for emulating the others, which is not very precise, but at this point I don't need much accuracy.

Thanks.