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  Topic: Octave +/- 1
frank

Replies: 6
Views: 147

PostForum: Algorithm development   Posted: Fri May 18, 2018 4:29 pm   Subject: Octave +/- 1
;------ Crossfade
RDAX REG2,1
RDAX ADCL,-1
MULX POT1
LDAX ADCL <<<<<<<<<<<<< should be: RDAX ADCL, 1
WRAX REG3,0
;------ Output
RDAX REG3,1
WRAX DACL,0
  Topic: Octave +/- 1
frank

Replies: 6
Views: 147

PostForum: Algorithm development   Posted: Fri May 18, 2018 9:34 am   Subject: Octave +/- 1
Your pitch routine is fine but the mix routines make no sense to me. Comments in the code stating what you are trying to do help. Without comments there is nothing I can suggest.
  Topic: Coding with macroes ?
frank

Replies: 2
Views: 72

PostForum: FV-1 software questions   Posted: Wed May 16, 2018 11:01 am   Subject: Coding with macroes ?
SpinASM does not have a macro processor built in so for simple things like a coefficient you should be able to use an EQU statement like:

coeff EQU 0.5 ; version 1 code
; coeff EQU 0.6 ; version 2 ...
  Topic: SpinASM Output Window not appearing [FIXED]
frank

Replies: 1
Views: 87

PostForum: FV-1 software questions   Posted: Mon May 14, 2018 10:07 am   Subject: SpinASM Output Window not appearing [FIXED]
Most likely the output window was moved off screen as there is no way to disable it. The position is stored in the registry and resetting the directories also resets the values in the registry. You co ...
  Topic: Tone Control
frank

Replies: 12
Views: 1172

PostForum: Algorithm development   Posted: Sat Mar 31, 2018 1:35 pm   Subject: Tone Control
You define "filter" as 0.8 but then do "RDAX filter" and RDAX expects a register not a decimal value as the first parameter.
  Topic: unconditional SKP
frank

Replies: 4
Views: 629

PostForum: Algorithm development   Posted: Tue Mar 13, 2018 4:16 pm   Subject: unconditional SKP
Yes but we are talking assembly here which is far closer to the hardware than C, a simple logical OR in C may map to multiple assembly instructions not just one.

One thing to consider is if you re ...
  Topic: unconditional SKP
frank

Replies: 4
Views: 629

PostForum: Algorithm development   Posted: Tue Mar 13, 2018 7:50 am   Subject: unconditional SKP
Most likely the combination of flags makes no sense to the logic in the instruction decoder. "SKP neg|gez" is illogical to a hardware decoder since we are using the sign bit to decide. "SKP neg|gez" i ...
  Topic: FV-1 startup
frank

Replies: 1
Views: 799

PostForum: FV-1 hardware questions   Posted: Sat Feb 17, 2018 6:58 pm   Subject: FV-1 startup
We never developed a spec for this, I would just try it out and see what you get. It will vary based on sample rate as there is a counter involved in the internal reset sequence.
  Topic: 2+2*2 = 8? spinasm compiler calculations are
frank

Replies: 2
Views: 693

PostForum: FV-1 software questions   Posted: Thu Feb 15, 2018 3:09 pm   Subject: 2+2*2 = 8? spinasm compiler calculations are
Yup, looks like it is not handling the order of operations properly. I did not write the assembler for FV-1 so do not know how they parse the equations or solve them but it does look like a simple le ...
  Topic: hex of m24-16
frank

Replies: 4
Views: 1544

PostForum: FV-1 software questions   Posted: Tue Feb 06, 2018 4:16 pm   Subject: hex of m24-16
It really comes down to a few things, using the right 8051 type part and making sure the assembler will assemble properly for it.

As to the 8051 type part, that may be a challenge since Phillips no ...
  Topic: dev board potentiometers
frank

Replies: 1
Views: 703

PostForum: FV-1 hardware questions   Posted: Sat Feb 03, 2018 10:08 am   Subject: dev board potentiometers
Basically any parts supplier, they are known as thumbwheel potentiometers such as:
https://www.digikey.com/products/en/potentiometers-variable-resistors/thumbwheel-potentiometers/77?k=thumbwheel%20po ...
  Topic: hex of m24-16
frank

Replies: 4
Views: 1544

PostForum: FV-1 software questions   Posted: Tue Jan 30, 2018 8:59 am   Subject: hex of m24-16
There are many variants of the 8051, you need to make sure you are using and the assembler is set to assemble for the right one. The comment in line 2 states it must be an 8K variant with ctr2 (counte ...
  Topic: Built-In Portamento on Pot Inputs?
frank

Replies: 1
Views: 669

PostForum: FV-1 hardware questions   Posted: Wed Jan 17, 2018 5:47 pm   Subject: Built-In Portamento on Pot Inputs?
Nope, the POT inputs are just POT inputs so it must be the way your code uses them. If you are doing a delay type thing where the pointer is controlled by the POT then you will hear a sweep in frequen ...
  Topic: Self oscillation on reverb
frank

Replies: 1
Views: 715

PostForum: FV-1 software questions   Posted: Thu Jan 11, 2018 9:32 am   Subject: Self oscillation on reverb
There are many things that can cause you to hear an oscillation, noise on the board, etc. The simple fix is to limit the reverb time as it simply may be too long.
  Topic: DIY Eurorack for FV1
frank

Replies: 4
Views: 1289

PostForum: FV-1 hardware questions   Posted: Mon Jan 01, 2018 11:10 am   Subject: DIY Eurorack for FV1
The FV-1 is the chip not a board, do you mean a dev board? If so you might want to see if you need any buffering, I do not know if there is any standard for euro rack signal levels. Also you risk dama ...
 
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