Can this all be done with C? or how can I call asm functions?

MIOS programming (C)
1

I am building a system that requires the following functions:

2 cores linked

Each core can handle:

  • 64 pots

  • 128 buttons

  • 64 rgb leds

-LCD screen that can receive display data via midi (use sysex and a sysex handler?)

In order to handle the 64 rgb leds, 2 DOUTx4 modules need to be used to control an led matrix (each one handles 32 leds).

On each DOUTx4 module, the first SR only uses 4 pins to drive common cathode columns. The other 3 SR’s each connect to one of the RGB colours:

SR1: columns

SR2: red (rows)

SR3: green (rows)

SR3: blue (rows)

The rgb leds would be set via NoteOn messages where the velocity value is decoded to turn on the rgb colour (e.g. there are only 7 possible colours so we only need 3 bits). This function would then have to set the values at the three different SR’s that represent the components colors of a single RGB led.

Does the RGB led handler need to be written in assembly code??

Can I write all of this in C?

If so, I would just start with the sdcc_skeleton_v1_9c.zip?  (I guess use the ain64_din128_dout128_v2_0.zip as a good starting point)

Next question: this whole control surface is going to be interfaced to a pc running max/msp. I want max to be able to send text strings to an lcd (or multiple) lcds on my controller. What is the best way to do this using midi?

thanks!

Danjel

2

Yes, RGB handling can be easily done in C. If much more should be handled in parallel, assembly code would be better (therefore I mostly write my own modules in assembly)

Template: currently I reorganize the whole MIOS project structure for better re-use.

E.g., the BLM matrix is now seperated in a special directory (modules/blm), and the application directory only contains the actual source files (see this directory).

And to make the confusion complete: when I release an application, all these directories are copied again into a single directory :wink:

However, what I want to say: if you want to develop this application future-proven, I recomment the new approach.

I will give you access to the programmer section of this forum, so that you can read more about the details.

LCD messages: you could realize this the same way like in the Motormix application

Best Regards, Thorsten.

3

cool!

I forgot to ask: If I already have modules written in assembly code, is there an easy way to call those functions from the main C app?

cheers,

  Danjel

4

Yes, just have a look into existing modules.

You can get write access to the repository if you want. This allows you to publish your modules

Best Regards, Thorsten.