Spin Semiconductor

Well, I finally got it sorted out. Ran a desk test, pen and paper and looked the evolution of the registers. fptr generates the "virtual clock" that takes samples and manages the interpolation part. It's a bit different from other algos with interpolation but it does the job really well. W...

Well it has almost been 11 years since I wrote this but it looks like I am using fptr as an interpolation coefficient since it is updated every real sample period. Yeah Frank, a long time, sorry to bring it up. Took me 9 years to check it out and read the code line by line :mrgreen: . I drew a bloc...

Bringing up an old thread!. I was looking at this code and can't get my head around the interpolation portion. I understand that between the pot and fptr you decide to take a new sample or not, but not how is interpolated to "fill the holes" between samples. Any thoughs? Maybe I'm missing ...

gfisys wrote: ↑Sat May 29, 2021 4:18 am Rdfx+Wrlx gives you control over the shelving, Rdfx+Wrax does not.

Rdfx+Wrax works only for lowpass, for highpass you need to use Rdfx+Wrhx

I saw your answer but never thanked! Thanks!!

Oh, how can I forgot the 2s complement!!!. Thanks Frank, all clear now.

I was studying the different formats for the signed fixed point values in the SpinASM Manual and came across the following table: S1.14 Real -2 -0.00006103516 0 0.00006103516 1.99993896484 Hex $8000 $FFFF $0000 $0001 $7FFF S1.9 Real -2 0.001953125 0 0.001953125 1.998046875 Hex $400 $7FF $000 $001 $3...

Go to the main Spin web page, and in the FV1 section there's a PDF "Basic of LFO's in the FV1", there's the answer to your question.

gary00k wrote: ↑Fri Jun 25, 2021 6:15 am You mean "Servo technique for sweeping through delay memory" in knowledge base or "Delay Servo Technique" thread on this forum?

Both addresses the same issue?

Check the Delay Servo Technique!

In the Spin Asm manual you have it explaned, on the Operand data Types part: Signed fixed point values are primarily used as coefficients (Operand2) for the multiply portion of an instruction. Depending on the actual opcode they may be in one of three different formats, "S1.14", "S1.9...

I looked into it several times and try to correspond the K2 and -Ks coef to the RDFX and WRHX in a filter. The RDFX can be calculated Kf = 1- e^(2.pi.freq.t), being t 1/sample rate. There's an aproximation of Kf = 2.pi.F / Fs too And for the WHRLX/WRLX there's no mention of the coefficient or the -K...

I was looking for the equations to calculate the WRLX and WRHX coefficents to apply in single pole low and high pass filter but I couldn't find them anywhere. Not in the forum or in the knowledge base. Maybe I'm searching in the wrong way, but someone can point me out in the right direction?. Also l...

Digital Larry wrote: ↑Tue Feb 02, 2021 6:40 pm I almost always have to post to a public forum before finding things like that.

It's a must!!. Must be the 5 min your mind needs to reset and clearly see the issue

I'm waiting for mine to arrive!!

Obviusly makes sense. Is one of the most common regulators around with the 78L33. Any recommendations about an LDO?.