Spin Semiconductor

rom_fla_rev.spn from Free DSP programs not functionin - no sweep.
What's wrong?

Nobody knows what is bad there?

Nobody? Frank,please, can you look at it?

Downloaded from site, loaded into my dev board and it works fine.

It is mysterious. I make it again just now: download from site, assembly in SpinAsm, programming in PonyProg to 24LC32 and doesn't work. In two boards. Reverb is working but flanger not, no sweep. Other progs working OK.

All I can suggest then is you check your board and make sure the POTs are working properly.

I have just put this into a pedal and it is working as it should regarding how it is coded, prehaps it would be of benefit if you could elaborate on what it isn't doing that you are expecting it to do.

I test it on two boards. Others progs are working there, all pots working. On flanger (rom_fla_rev.spn downloaded from site)) working Pot0 (Reverb level) also Pot2 (Efect level) but Pot1 not working , flanger is not sweeping I think LFO not working. Internal Flanger works fine.

I tried it on my Erica Synths Black Hole and it works fine. I hadn't looked too closely at this one before, but the triangle waveform is generated "in software" rather than using a built in ramp. It's really baffling that it doesn't work for you.

DL

========================================

;--------------------------------------------------------
; flange rate from pot 1
; as adder value to ramp
; gen, filtered at 0.3Hz:
;--------------------------------------------------------
rdax pot1, 1.0 ;read pot1
mulx pot1 ;square value, range = 0 to 1
sof 0.05, 0.005 ;scale to range of 0.005 to 0.55
sof .001, 0 ;scale further to 0.00005 to 0.0055
rdax ramp, 1.0 ;add to ramp value
and 0xbfffff ;allow for rollover (bypasses saturation limiting)
wrax ramp, 1.0 ;write back to ramp register, keep acc
sof 1.0, -0.25 ;subtract 0.25 to center rampwave about 0
maxx reg0, 0 ;get absolute value (make triangle wave from 0 to 0.25)
sof 1.0, -0.125 ;subtract 0.125 to make triangle wave go -0.125 to +0.125
sof .00015, 0 ;scale to filter
rdax tri, 0.9999 ;filter triangle waveform so that pitch bend does not get too great at high rates
wrax tri, 0 ;write triangle wave to register, clear accumulator

I can try it but I don't know what a part source code relpace with this code.
Still, I do not understand why it does not work for me when for others works .
Here is my hex file (generated by SpinAsm) maybe someone can check it.
http://www.kypo.eu/rom_fla_rev.hex

We also need to see the schematic, board layout, etc.

kypo wrote:I can try it but I don't know what a part source code relpace with this code.

This is just a copy of the LFO section of that code. I'm not suggesting you replace anything. It works fine for me.

frank wrote:We also need to see the schematic, board layout, etc.

Schematic is exactly the same as in datasheet. As I wrote higher every all other progs working ok also from external 24LC32 eeprom also internal progs including internal flanger. ( I have tried GA_Demo set, M16-24 set)
I would like to build my own set with small modifications.

Digital Larry wrote:

kypo wrote:I can try it but I don't know what a part source code relpace with this code.

This is just a copy of the LFO section of that code. I'm not suggesting you replace anything. It works fine for me.

I've reviewed this part of the code and it's exactly the same, so I can not understand where the error might be.

kypo wrote:

Digital Larry wrote:

kypo wrote:I can try it but I don't know what a part source code relpace with this code.

This is just a copy of the LFO section of that code. I'm not suggesting you replace anything. It works fine for me.

I've reviewed this part of the code and it's exactly the same, so I can not understand where the error might be.

I don't think digital Larry suggested an error in the code at all he just pointed out how the triangle waveform is made. (within that code snippet).
When you mention 'sweep'do you refer to rate or depth of flange or more like feedback/regen, what exactly are you referring too as this effect has a limited control set, yes it flanges, with more info we may be able to help better.