copy or fill a range of cogram

ManAtWork

I need a buffer for ADC samples of multiple pins. Then I have to do some complex calculations on them. Because the calculations take some time and I don't want the samples to be overwritten before I'm done I have to use double buffering. New samples are added into the buffer values for averaging. So I have to clear the buffer before it's re-used.

Is there a trick to copy a range of cogram registers to another range or to fill multiple registers with zeroes? At the moment I'm using setq+wrlong/rdlong to/from an intermediate buffer in hub ram. This takes about the same time as a loop with ALTS/D indexing but is much simpler.

Is there a more elegant way, maybe with the streamer? Or a more clever way of indexing?

cgracey

There is no more economical shortcut than SETQ+RD/WRLONG. I've struggled with the same thing. And you can do 'SETQ+WRLONG #0,addr' to clear a section of hub RAM before loading it into registers to clear them.

ManAtWork

Ok, thanks, Chip.

BTW, your ADC and DAC tutorials were really informative. And using the P2 as scope to visualize or debug it's own output is really brilliant.

Wuerfel_21

Untested, but this should fill cog memory with zeroes, if the documentation isn't lying and the unmapped RAM area indeed reads zeroes:

SETQ #how_much
RDLONG where,##$80000

cgracey

Wuerfel_21 wrote: »

Untested, but this should fill cog memory with zeroes, if the documentation isn't lying and the unmapped RAM area indeed reads zeroes:

SETQ #how_much
RDLONG where,##$80000

Yes! That would work.

Cluso99

Nice one. BTW Tested and works!
I'm adding it to the tricks and traps thread.