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--- sid_library [2011/09/27 11:20] – wadmin
+++ sid_library [2018/08/26 09:36] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-This library allows the operation of the SIDaster Shield (V2.3+) by specifying setup / communication functions. See the comments inside the library file files for in depth description.
+===== SID Library =====
+The library provides the setup and communications functions to interface an Arduino board with a [[MOS6581]] Sound Interface Device (SID).
+Connecting the Arduino board to the SID is made through the Arduino hadware SPI interface, using 74hc595 deserializers.
+Schematic, Layout and Source Code of the associated Midi Synth project SIDaster can be found here : http://bit.ly/SIDaster
+==== Download ====
+Download Link : {{:sid_lib_v4.zip|}}
 ==== Installation ====
+As simple as an Arduino library installation:
   * Go to your ''Arduino\Library'' subfolder.
@@ Line 25: / Line 35: @@
 ==== Code example ====
-Here is an example of how to use the library:
+Here is an example of how to use the library, showing how to combine the ''Midi'' library and the ''SID' library.
+<sub>note: it's a reduced version of a engineering version of the SIDaster, lots of things have been deleted to ease comprehension, however brute force copy paste of this code shall not compile properly under Arduino IDE.</sub>
 <code C>
@@ Line 37: / Line 49: @@
 // These all must be below 0x0F (15)
-static const unsigned char BASE_NOTE = 12;
-static const unsigned int NOTES[] = {
-, 308, 326, 346, 366, 388, 411, 435, 461, 489, 518, 549,
-, 616, 652, 691, 732, 776, 822, 871, 923, 978, 1036, 1097, 1163, 1232, 1305, 1383, 1465, 1552, 1644,
-, 1845, 1955, 2071, 2195, 2325, 2463, 2610, 2765, 2930, 3104, 3288, 3484, 3691, 3910, 4143, 4650,  // 4650 = C4
-, 5220, 5530, 5859, 6207, 6577, 6968, 7382, 7821, 8286, 8779, 9301, 9854, 10440, 11060, 11718, 12415,
-, 13935, 14764, 15642, 16572, 17557, 18601, 19709, 20897, 22121, 23436, 24830, 26306, 27871, 29528,
-, 33144, 35115, 37203, 39415, 41759, 44242, 46873, 49660, 52613, 55741, 59056, 62567};
 //==============================
 // GLOBAL SYNTH VARIABLES INIT
 //==============================
-// Coarse Frequency, base 2, value from 0 (-2) to 5 (+2)
-static byte coarse1 = 0;
-static byte coarse2 = 0;
-static byte coarse3 = 0;
-// Default midi channel
-static byte mchannel = 1;
-// Synth State Managment
-static boolean trigged = false; // indicating if synth is playing
-static boolean retrigger = true; // indicating if retriggering ADSR is on
-// Local Osc Frequency
-// Registers @ B00000 and B00001
-// Default 440hz = 0x1CD5
-static word    freq1 = 0x1CD5;
-static word    freq2 = 0x1CD5;
-static word    freq3 = 0x1CD5;
-// PWM
-// Default Square Wave = 0x800
-// Formula : PWout = (PWn/40.95) %
-static word    pw1 = 0x800;
-static word    pw2 = 0x800;
-static word    pw3 = 0x800;
-// Control Register
-// Default: Saw
-// Content NOI|SQR|SAW|TRI|TST|MOD|SYN|GAT
-static byte    ctrl1 = 0X21;
-static byte    ctrl2 = 0X21;
-static byte    ctrl3 = 0X21;
-// Attack and Decay
-// Default : Shortest
-static byte    ad1 = 0x00;
-static byte    ad2 = 0x00;
-static byte    ad3 = 0x00;
-// Sustain and Release
-// Default: Max sustain and no release
-static byte    sr1 = 0xF0;
-static byte    sr2 = 0xF0;
-static byte    sr3 = 0xF0;
-// Cutoff Frequency
-static word    freq = 0x7FF;
-// Resonnance and CTRL
-// Res= 0 no resonnance, Res=F max resonnance
-// Routing 0 is no filter, 1 is filter
-// RES(4)|EXT|F3|F2|F1
-static byte    res = 0x1;
-// Mode
-// Content EXT|HP|BP|LP|VOL(4)
-static byte    mode = 0x1F;
-// Mono Note Memory
-static byte last_note = 0;
-static byte current_note = 0;
-static byte notes = 0;
-// ########################################################
 SID sid;
-// Give voices some initial params
-//
-void synth_init()
-{
-  // Freq init
-  sid.send(SID_FREQ1LO,char(freq1));
-  sid.send(SID_FREQ1HI,char(freq1>>8));
-  sid.send(SID_FREQ2LO,char(freq2));
-  sid.send(SID_FREQ2HI,char(freq2>>8));
-  sid.send(SID_FREQ3LO,char(freq3));
-  sid.send(SID_FREQ3HI,char(freq3>>8));
-  // PWM Init
-  sid.send(SID_PW1LO,char(pw1));
-  sid.send(SID_PW1HI,char(pw1>>8));
-  sid.send(SID_PW2LO,char(pw2));
-  sid.send(SID_PW2HI,char(pw2>>8));
-  sid.send(SID_PW3LO,char(pw3));
-  sid.send(SID_PW3HI,char(pw3>>8));
-  // CTRL
-  sid.send(SID_CTRL1,ctrl1);
-  sid.send(SID_CTRL2,ctrl2);
-  sid.send(SID_CTRL3,ctrl3);
-  // ADSR
-  sid.send(SID_AD1,ad1);
-  sid.send(SID_SR1,sr1);
-  sid.send(SID_AD2,ad2);
-  sid.send(SID_SR2,sr2);
-  sid.send(SID_AD3,ad3);
-  sid.send(SID_SR3,sr3);
-  // Filter + Main
-  sid.send(SID_FCLO,char(freq));
-  sid.send(SID_FCHI,char(freq>>8));
-  sid.send(SID_RES,res);
-  sid.send(SID_MODE,mode);
-}
 // Play sound at frequency specified on voice specified
@@ Line 226: / Line 125: @@
 }
 </code>
+==== Changelog ====
+See the SID.h file comments for library changelog.