Spin Semiconductor

Does it show up if you go to Devices >> USB in the VM? I'm not that familiar with Macs but I think they have the dmesg command that you can run from a terminal, this should give you some information when you plug in a USB device, see if that tells you anything when you plug the dev board in. Like yo...

For Virtual Box have you installed the guest additions, I think you need these for USB to work properly. I'm running Windows XP in Virtual Box and the dev board is detected and works fine.

I think to get even spacing you can scale the pot by the number of steps you want divided by the number of steps in the next higher power of 2 and then do the AND. For example for 10 steps multiply the pot by 10/16 (0.625) and then AND the top 4 bits. That gives steps of 0.5625 0.5 0.4375 0.375 0.31...

There shouldn't be any DC offset, the inputs are high pass filtered which would remove any DC that was present.

I haven't tried multiple FV-1s but you can program the EEPROM whilst it is connected to the FV-1 so having two master devices connected at once works, which is essentially what you're doing if you connect multiple FV-1s. So I'd guess it will work but you will need to ensure only one FV-1 tries to ac...

It could be your ic-prog settings are wrong. For my programmer in Settings/Hardware you need to select "JDM programmer" as the programmer and tick "Invert Data Out" and "Invert Clock"

Even if you used 3.3 Volt Zeners the FV-1 could still be damaged, the peak voltage could still exceed 3.3Volts. You could use the circuit I posted over on diystompboxes instead http://www.diystompboxes.com/smfforum/index.php?topic=108891.msg994174#msg994174 it is safe with 5 Volts or larger signals ...

Hi Martin

I did reply to your PM about this but in case you didn't get it for some reason I thought I'd post here as well. If you could send me a copy of your code I'll have a look at it and see if I can make it work.

I've done a similar thing with a PIC so it should be possible with a nano , writing the data to the EEPROM is just a case of writing it byte by byte, the datasheet explains how to do it, there's no special protocol it's just I2C, which the nano can do. The trickier bit for me was getting the hex fil...

The I2C clock is about 260KHz

Sorry, what I meant was can you make SpinCAD output the value of the "lfsr" register, or the value of your sample and hold? If you can, just run it until you think it's repeating and look at the values to see if it is.

If you mean the code from Frank in this thread http://www.spinsemi.com/forum/viewtopic.php?t=245&postdays=0&postorder=asc&highlight=lfsr&start=15 that is a 24 LFSR bit noise generator so it should have a pattern 16,777,216 steps long which if you update it every cycle will take about...

I don't think there is an easy way to use the sine. It should be possible to replace the ramp with a counter something like this. equ ledramp reg11; put this at the top of the code with the others ;Taptempo rate indicator, creates a square wave at the tap tempo rate ldax ledramp sof 1,1/32768 ;add 1...

pharaohamps wrote:Slacker, that's a nice bit of code. Thanks for sharing.
Try something like this to really get square -
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That's a nice little snippet, thanks for that, I'll give it a try.

If anyone's interested here's a tremolo I did using pot skip routines to do Sine, rectified sine both ways so pointy or humpy :) up and down ramps, triangle, trapezoid and square. All the wave shapes are scaled to the same range. Some of the wave shapes aren't that useful it was more an exercise in ...