MidiBox SID Control Surface / Pb with encoder

[FREON]

Hi,

I've just finished my SID Synthetiser and it rocks !!! Thanks Thorsen for sharing such a great DIY project with all of us !!!

By the way, I have also built the minimal control surface, so-called step A. I guess I will not go further with the control surface (B, C & D) as this one is already flexible enough for my needs.

However, I noticed a strange behaviour with the encoder (I'm using the Mouser ENC160-24p as recommended). When I'm editing some values (let's say the LFO rate), one detent on the encoder matches with one increment/decrement of the value, which is perfect. When I'm editing some other values (let's say the filter resonance) the value can get incremented/decremented only by 8 (but matching the number of detents :8). Also when using the encoder to move in the menu, I need 4 detents.....

Could someone confirm if this is "normal" or not as I had some troubles to indentify which pins of the encoder was A, B & C.

Also I noticed that I don't have access to the Rec waveform for the Oscillator.  Is it another "encoder problem" or something missing in the minimum control surface firmware ???

Thanks for your help,

Richard

[FREON]

Hi,

I've just finished my SID Synthetiser and it rocks !!! Thanks Thorsen for sharing such a great DIY project with all of us !!!

By the way, I have also built the minimal control surface, so-called step A. I guess I will not go further with the control surface (B, C & D) as this one is already flexible enough for my needs.

However, I noticed a strange behaviour with the encoder (I'm using the Mouser ENC160-24p as recommended). When I'm editing some values (let's say the LFO rate), one detent on the encoder matches with one increment/decrement of the value, which is perfect. When I'm editing some other values (let's say the filter resonance) the value can get incremented/decremented only by 8 (but matching the number of detents :8). Also when using the encoder to move in the menu, I need 4 detents.....

Could someone confirm if this is "normal" or not as I had some troubles to indentify which pins of the encoder was A, B & C.

Also I noticed that I don't have access to the Rec waveform for the Oscillator.  Is it another "encoder problem" or something missing in the minimum control surface firmware ???

Thanks for your help,

Richard

[TK.]

Hi Richard,

the firmware changes the "encoder speed" depending on the value range (max value). Some values with a short range require more detents than others, in order to allow a precise control. So, this effect is ok.

There are also some parameters like the oscillator ADSR or the filter cutoff/resonance, which are only 4 bit wide (limited by the SID chip itself). Thats the reason why these values can only be incremented/decremented by 8

But regarding the Rectangle waveform I'm unsure ("Pul" for Pulse should be displayed). If some inc/dec pulses from the encoder are missing

(see also http://www.ucapps.de/mios/mios_encoder_modes.gif), you either have to change the connections (see the schematics under Concepts->MBHP->DIN) or the encoder mode in the application setup (-> mios_tables.inc)

Hope this helps - have fun with the SID! :)

Best Regards, Thorsten.

[TK.]

Hi Richard,

the firmware changes the "encoder speed" depending on the value range (max value). Some values with a short range require more detents than others, in order to allow a precise control. So, this effect is ok.

There are also some parameters like the oscillator ADSR or the filter cutoff/resonance, which are only 4 bit wide (limited by the SID chip itself). Thats the reason why these values can only be incremented/decremented by 8

But regarding the Rectangle waveform I'm unsure ("Pul" for Pulse should be displayed). If some inc/dec pulses from the encoder are missing

(see also http://www.ucapps.de/mios/mios_encoder_modes.gif), you either have to change the connections (see the schematics under Concepts->MBHP->DIN) or the encoder mode in the application setup (-> mios_tables.inc)

Hope this helps - have fun with the SID! :)

Best Regards, Thorsten.