MIOS: Encoders/Buttons & user fun

MIOS programming (Assembler)
1

Hi all (and Thorsten, especially),

I’m studying MIOS to figure out how I’m going to do the Axe-Thing rebuild (see my other post under “MIOS programming” explaining about this), and it’s slowly becoming clearer (thanks for the great introduction to MIOS on the Concepts part of the main page, Thorsten).

It looks like - correct me if I’m wrong - that encoders and buttons can be mixed together in the DIN chain (you just have to set encoder locations in a table).  Does this mean that header J6 on the Core is no longer needed for encoders with MIOS?

Since I’m going to use non-multiplexed Analog input, can I use the ‘RC0-4’ port lines on the 18F452 for my own nefarious purposes? :slight_smile:  If so, can my own scanning subroutines be worked into the main loop via a user function hook?  (If that doesn’t make any sense, I’ll try to explain it better in another message).

I have more questions, but this is a good start! :slight_smile:

Thanks,

  Phil

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I don’t know how that subject got messed up, but it’s supposed to say “MIOS: Encoders/Buttons & User Functions”.

Sorry about that.

Phil

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Hi Phil,

yes, thats correct. Rotary encoders are now handled like buttons and have to be connected to the J9 DIN chain. Once the DIN pins have been assigned to an encoder, USER_DIN_NotifyToggle will not be called for these pins anymore. USER_ENC_NotifyChange will be called instead.

So far as you don’t use the AIN multiplexers, a graphical LCD or a SID module, RC0-5 are free.

My suggestion is to add the scanning routine to USER_SR_Service_Finish, this routine is called on every update cycle for the DIN/DOUT chain (update period can be lowered to 1 ms). It guarantees that no event get lost. The timer hook could be used for higher sampling periods.

Best Regards, Thorsten.