<![CDATA[ChipMusic.org - LITTLE-SCALE SN76489 USB MIDI]]> 2016-08-22T17:52:50Z PunBB https://chipmusic.org/forums/topic/11015/littlescale-sn76489-usb-midi/ <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> Project not work with other crystal, I think the error in code. Notes not play correct, they play but not correct, c, c#,d, d#, d, e...
I think

Knife Crimes wrote:

line 221:
void doBend(byte channel, unsigned int bend_usb) {

changes to:
void doBend(uint8_t channel, int bend_usb) {

not correct
Any ideas, or it's correct and I have problem with something else (chips, wireless etc)?

]]> https://chipmusic.org/stress_tn 2016-08-22T17:52:50Z https://chipmusic.org/forums/post/247320/#p247320 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> Knife Crimes wrote:

Compiled under Arduino IDE 1.6.9 ...

Thank you!
P.S. now i have problem with incorrect cc notes, I think it's crystal problem

]]> https://chipmusic.org/stress_tn 2016-06-23T20:09:53Z https://chipmusic.org/forums/post/245381/#p245381 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> Compiled under Arduino IDE 1.6.9 and Teensyduino 1.29 Beta #3 by editing the following lines:

line 51:
prog_char sample_space[13952] PROGMEM = {

changes to:
const char sample_space[13952] PROGMEM = {

line 221:
void doBend(byte channel, unsigned int bend_usb) {

changes to:
void doBend(uint8_t channel, int bend_usb) {

Haven't tested on hardware, since I have no SN76489.

Edit - link to Teensyduino https://forum.pjrc.com/threads/35068-Te … -Available

]]> https://chipmusic.org/Knife+Crimes 2016-06-23T12:24:41Z https://chipmusic.org/forums/post/245358/#p245358 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> Hey stress_tn,

Assuming you're using the firmware linked in the linked article - http://milkcrate.com.au/_other/download … DI_103.ino

Problem is, the function being passed to setHandlePitchChange has the wrong datatypes as arguments. Fix that function. It's less stuffing around than trying to install the "right" (out of date) version of Teensyduino.

Start by finding this line:
void doBend(byte channel, unsigned int bend_usb) {

And change it to:
void doBend(uint8_t channel, unsigned int bend_usb) {

]]> https://chipmusic.org/Knife+Crimes 2016-06-22T22:59:35Z https://chipmusic.org/forums/post/245337/#p245337 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> little-scale wrote:

Firmware now supports up to four SN76489 chips.

Also added sample support.

http://little-scale.blogspot.com.au/201 … -quad.html

big_smile

I have problem with arduino and teensyduino version. arduino 1.0.6, 1.6.3, 1.6.9 and teensyduino 1.28 not work, I always see error. Please help and tell me what version of arduino and teensyduino are you use?

Error:
  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.
Arduino: 1.0.6 + Td: 1.28 (Windows NT (unknown)), Board: "Teensy 2.0"
sketch_jun22a.ino.ino: In function 'void setup()':
sketch_jun22a.ino.ino:221: error: invalid conversion from 'void (*)(byte, unsigned int)' to 'void (*)(uint8_t, int)'
sketch_jun22a.ino.ino:221: error:   initializing argument 1 of 'void usb_midi_class::setHandlePitchChange(void (*)(uint8_t, int))'

]]> https://chipmusic.org/stress_tn 2016-06-22T19:56:37Z https://chipmusic.org/forums/post/245333/#p245333 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> Might be of interest, a little enhancement about the note on/off handling smile
to avoid a note off to cut short any new playing note...
EDIT: I forgot to wrote channel check, added now  ^_^
SID effect have also been done...:)
In your Teensy board code >>
add a variable to keep track of the latest MIDI note on number

byte p_pitch;
byte p_channel;

then in the function : void doNoteon ()
add:
p_pitch = pitch;
p_channel = channel;
each time there is a check for velocity >0

then in : void doNoteOff()

if(pitch == p_pitch)   // avoid note cuts
        {
            velocityData[channel + (chip_select * 4)] = 0;
            writeAmplitude(0, channel, chip_select);
        }
        else if((pitch != p_pitch) && (channel != p_channel))
        {
            velocityData[channel + (chip_select * 4)] = 0;
            writeAmplitude(0, channel, chip_select);
        }

then in in the function : void doMidiIn ()
//note on

Line : else if((data < 0x80) && (flag_previous == 1))
add , p_pitch = data;

Line :if((data >= 0x90) && (data < 0xa0) && (flag_previous == 0))
add, p_channel =channel; 

this will keep track of the previous note played when there is a note off message next

//note off
else if((data < 0x80) && (flag_previous == -2)) 
    {
      velocity = data;
      
    if(pitch == previous_pitch)  // only if previous pitch is the same!...to avoid note cuts
      {
          doNoteOff(channel, pitch, velocity);
      }

      else if((pitch != p_pitch) && (channel != p_channel)) // if pitch is not the same BUT from another channel
      {
            velocityData[channel + (chip_select * 4)] = 0;
            writeAmplitude(0, channel, chip_select);
      }
      flag_previous = 0;
    }
]]> https://chipmusic.org/Aly+James 2013-11-17T19:00:23Z https://chipmusic.org/forums/post/191212/#p191212 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> If you wanted to get crazy, I'm sure there's a way to switch between clocks based on pitch so you can get the low notes when you need them on the lower clock, and toggle to a faster clock for higher pitches.

]]> https://chipmusic.org/theDutchess 2013-09-25T02:13:48Z https://chipmusic.org/forums/post/185495/#p185495 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> Worth mentioning that as we lower the master clock , we gain access to lower notes but we also reduce the pitch resolution on higher octaves smile

]]> https://chipmusic.org/Aly+James 2013-07-07T04:36:10Z https://chipmusic.org/forums/post/176019/#p176019 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> Sweet. It'll work for both so it's cool.

]]> https://chipmusic.org/Im_A_Track_Man 2013-05-27T07:04:15Z https://chipmusic.org/forums/post/169756/#p169756 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> Maybe not YM2149F because I have none of those here.

But I have about 15 AY38912 chips, so I can make the same thing but for 5 x AY3812 / 38910 smile

]]> https://chipmusic.org/little-scale 2013-05-27T04:26:15Z https://chipmusic.org/forums/post/169742/#p169742 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> An chance of a YM2149F version?

]]> https://chipmusic.org/Im_A_Track_Man 2013-05-27T03:38:05Z https://chipmusic.org/forums/post/169739/#p169739 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> grea work!
sample support + an armada of pulse waves... now I will make some good use of my 10 SN76489N smile

]]> https://chipmusic.org/Aly+James 2013-05-26T16:49:26Z https://chipmusic.org/forums/post/169680/#p169680 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> that is insane heart heart

]]> https://chipmusic.org/liquidcalm 2013-05-26T13:29:56Z https://chipmusic.org/forums/post/169659/#p169659 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> Firmware now supports up to four SN76489 chips.

Also added sample support.

http://little-scale.blogspot.com.au/201 … -quad.html

big_smile

]]> https://chipmusic.org/little-scale 2013-05-26T11:57:31Z https://chipmusic.org/forums/post/169653/#p169653 <![CDATA[Re: LITTLE-SCALE SN76489 USB MIDI]]> YAY FOR SQUARE WAVES

]]> https://chipmusic.org/little-scale 2013-05-25T12:46:40Z https://chipmusic.org/forums/post/169534/#p169534