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Author Topic: TI84+ soundchip - arduino SID emulator  (Read 35935 times)

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Offline Keoni29

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TI84+ soundchip - arduino SID emulator
« on: January 14, 2013, 01:20:26 pm »


I finally made this! It's a breadboard arduino running a sid emulator and a link protocol. You can write to registers in the emulated SID chip. It's very user friendly. Now it's possible to have ingame music and soundeffects without terrible framerate drops.

I need to clean up the source, so that's up for download tomorrow.
Spoiler For Spoiler:
Code: [Select]
#include <SID.h>

#define SOUND 1
#define MIDI 0

// MACROs
#define PIN2H (PIND & 0B00000100)
#define PIN3L !(PIND & 0B00001000)

#define CLR(x,y) (x&=(~(1<<y)))
#define SET(x,y) (x|=(1<<y))

SID mySid;

void setup()
{
  pinMode(2,INPUT);
  pinMode(3,INPUT);
  mySid.begin();
}

int n=0;
int timer=0;
int count=0;
int dcount=0;
byte get=B00000000;
int addrval[3] = {0,0,0};


    #define CHANNEL1  0
    #define CHANNEL2  7
    #define CHANNEL3  14


void loop()
{
  do{
    do
    {
      if (PIN3L)
      {
        if (PIN2H)
        {
          CLR(get,count);
        }
        else
        {
          SET(get,count);
        }
        count++;
        
        while(PIN3L)
        {
        timer++;
          if (timer==500){
            n=count=0;
            break;
          }
        }
        timer=0;
      }
    }while(count!=8);
    addrval[n]=get;
    n++;
    count=0;
  }while(n!=2);

  mySid.set_register(addrval[0], addrval[1]);
  n=0;
}


« Last Edit: January 20, 2013, 09:36:17 am by Keoni29 »
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Offline Lionel Debroux

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Re: TI84+ soundchip - arduino SID emulator
« Reply #1 on: January 14, 2013, 02:01:58 pm »
Nifty ;)

Relayed to the French community: http://tiplanet.org/forum/viewtopic.php?t=11111
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Offline Keoni29

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Re: TI84+ soundchip - arduino SID emulator
« Reply #2 on: January 14, 2013, 02:05:14 pm »
Thank you for translating :)
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Offline Lionel Debroux

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Re: TI84+ soundchip - arduino SID emulator
« Reply #3 on: January 14, 2013, 02:12:44 pm »
You're welcome ;)
The posts will be updated on the TI-Planet side when you have posted the source code, the binaries, breadboard schematics, and whatever else.
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Offline Keoni29

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Re: TI84+ soundchip - arduino SID emulator
« Reply #4 on: January 14, 2013, 02:14:27 pm »
The breadboard schematic is just a breadboarded arduino. You can use a stock arduino and hook up pin 9 to a set of speakers or headphones.
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Offline SpiroH

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Re: TI84+ soundchip - arduino SID emulator
« Reply #5 on: January 14, 2013, 03:54:19 pm »
It's a quite nice idea, i like it! I would suggest you find (make) a small-pcb board + perhaps a phone loudspeaker, so that it would be possible to sorta of glue it to the calculator's back, making more portable. Just an idea. :)
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Offline Keoni29

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Re: TI84+ soundchip - arduino SID emulator
« Reply #6 on: January 14, 2013, 04:09:50 pm »
Ninja'd you. I already made it :D
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Offline TIfanx1999

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Re: TI84+ soundchip - arduino SID emulator
« Reply #7 on: January 14, 2013, 10:55:26 pm »
Pretty cool Keoni! ^^
« Last Edit: January 14, 2013, 10:55:40 pm by Art_of_camelot »
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Offline Sorunome

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Re: TI84+ soundchip - arduino SID emulator
« Reply #8 on: January 14, 2013, 11:15:51 pm »
Nice! Now just build it INSIDE of a calculator :P
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Offline Ranman

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Re: TI84+ soundchip - arduino SID emulator
« Reply #9 on: January 15, 2013, 02:14:26 am »
Awesome work!

There is as special place in my heart for the C64 and its SID chip!
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Offline Keoni29

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Re: TI84+ soundchip - arduino SID emulator
« Reply #10 on: January 15, 2013, 04:56:37 am »
Quote from: Sorunome on January 14, 2013, 11:15:51 pm
Nice! Now just build it INSIDE of a calculator
That's the next step. First I want to make sure it's flawless. I will also add the original midi out code to the chip. This project was based around the code of my midi interface.

Edit: The midi feature is now implemented. I can now send midi messages as long as they are 3 bytes in size. With a jumper setting I can set the soundchip to SID or MIDI mode.
« Last Edit: January 15, 2013, 08:01:49 am by Keoni29 »
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Offline Ranman

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Re: TI84+ soundchip - arduino SID emulator
« Reply #11 on: January 15, 2013, 08:34:58 am »
« Last Edit: January 15, 2013, 08:39:03 am by Ranman »
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Offline SpiroH

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Re: TI84+ soundchip - arduino SID emulator
« Reply #12 on: January 15, 2013, 10:09:40 am »
Quote from: Keoni29 on January 14, 2013, 04:09:50 pm
Ninja'd you. I already made it :D
You should show it off then to give it a bit of spice...
Can you do the same trick to ti-nspire?
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Offline Keoni29

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Re: TI84+ soundchip - arduino SID emulator
« Reply #13 on: January 15, 2013, 10:49:08 am »
I do not own a nspire, but if it has two I/O lines to work with I can easily implement it. I just shift out the data from the calculator with one data line and one clock line.

Without the midi function. Old picture, but shows the size of the board


With the midi connector and an on/off switch. It runs off the calculators batteries. An atmega MCU runs fine on 4v-5v, but 6v will damage it. I added a diode to lower the voltage a bit.


There you have it! It's almost what I had in mind for my profile essay: TI-nterface. I can still add code for GPIO (changing the state of the I/O pins).

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Offline Nick

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Re: TI84+ soundchip - arduino SID emulator
« Reply #14 on: January 15, 2013, 12:25:39 pm »
How long does it take to send such a command to the chip?
it looks great, and sounds even better :)

And sure you have to add gpio support, it's a wast of pins if you don't do so, or use an ATtiny45 or something equivalent. Those are arduino compatible, and are about a third of the size of the atmega328p.

It looks like that midi port is big to get it into a box, how are you gonna solve that? keep it outside?
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