Ozpropdev et al.

rjo__ · 2017-01-27 06:49

cgracey wrote: »

If you set up RDFAST or WRFAST, you can move data between cog and hub with a single instruction for each long. With the streamer, you can move data between pins and hub. And there are those SETQ/SETQ2-RDLONG/WRLONG combos that can move longs between cog/lut and hub on every clock.

I have been on hiatus. We finally sold a building that stored some medical equipment, which left me packing and then driving a uhaul truck to Las Vegas.
Just before leaving I destroyed one of my P123 boards, and just after arriving I think I have found a use for Parallax's remaining stock:)

So if you guys are thinking of ordering another P123, get to it before they are gone:)

BUT THAT'S NOT THE PURPOSE OF THIS THREAD>

My understanding is that the streamer can be used to transfer pin states to Hub Ram at a given frequency... I don't know how many pins or how to go about setting it up.

Having watched Chip work, I suspect I can transfer any number of pins, and I suspect that they should be consecutive, but I don't really know. If we can use the streamer in this way then I would like to fiddle with it to see if I can use it to improve the bandwidth for
image acquisition.... and then I think I might look seriously at building some cameras.

If you (or someone other than Chip) could spend a few minutes and code an 8-bit sample, I would deeply appreciate it.

Thanks

Rich

ozpropdev · 2017-01-27 07:17

A while back I built a logic analyser using a P123-A9 board.
It uses the streamer to capture pin data up to 32 bits.

http://forums.parallax.com/discussion/163967/p123-a9-prop2-logic-analyzer

I need to update to the latest version but here's a snippet from the code that captures the pins.

dat		orgh
		org

capture_cog	loc	ptra,#@capcon

.loop		rdlong	pa,ptra wz	'wait for start command
	if_z	jmp	#.loop

		setxfrq	##$8000_0000	'sysclk sample rate
		wrfast	#0,##@samples
		xinit	##%1111_0000_0000_0000 << 16 | sample_length,#0
		waitxfi

		wrlong	#0,ptra		'capture done

		jmp	#.loop

rjo__ · 2017-01-28 17:57

Ah hah!!!

I looked at that a while back for other issues, very helpful.
Stuck without my P123 at the moment. Will be home sometime next week.

Thanks

Rich

Ozpropdev et al.

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