Jonne Valola / PokittoLib Featured

PokittoLib is the library needed for programming the Pokitto DIY game console (www.pokitto.com)

Dependents:   YATTT sd_map_test cPong SnowDemo ... more

PokittoLib

Library for programming Pokitto hardware

How to Use

  1. Import this library to online compiler (see button "import" on the right hand side
  2. DO NOT import mbed-src anymore, a better version is now included inside PokittoLib
  3. Change My_settings.h according to your project
  4. Start coding!

POKITTO_LIBS/Synth/Synth_wavefuncs.cpp@63:7d1c08cdde5c, 2018-10-23 (annotated)

Committer:
Pokitto
Date:
Tue Oct 23 16:21:01 2018 +0000
Revision:
63:7d1c08cdde5c
Parent:
31:f4b9b85c7b62
Child:
66:6281a40d73e6
Graphics bug fixed

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Pokitto 31:f4b9b85c7b62 1 /**************************************************************************/
Pokitto 31:f4b9b85c7b62 2 /*!
Pokitto 31:f4b9b85c7b62 3 @file Synth_wavefuncs.cpp
Pokitto 31:f4b9b85c7b62 4 @author Jonne Valola
Pokitto 31:f4b9b85c7b62 5
Pokitto 31:f4b9b85c7b62 6 @section LICENSE
Pokitto 31:f4b9b85c7b62 7
Pokitto 31:f4b9b85c7b62 8 Software License Agreement (BSD License)
Pokitto 31:f4b9b85c7b62 9
Pokitto 31:f4b9b85c7b62 10 Copyright (c) 2016, Jonne Valola
Pokitto 31:f4b9b85c7b62 11 All rights reserved.
Pokitto 31:f4b9b85c7b62 12
Pokitto 31:f4b9b85c7b62 13 Redistribution and use in source and binary forms, with or without
Pokitto 31:f4b9b85c7b62 14 modification, are permitted provided that the following conditions are met:
Pokitto 31:f4b9b85c7b62 15 1. Redistributions of source code must retain the above copyright
Pokitto 31:f4b9b85c7b62 16 notice, this list of conditions and the following disclaimer.
Pokitto 31:f4b9b85c7b62 17 2. Redistributions in binary form must reproduce the above copyright
Pokitto 31:f4b9b85c7b62 18 notice, this list of conditions and the following disclaimer in the
Pokitto 31:f4b9b85c7b62 19 documentation and/or other materials provided with the distribution.
Pokitto 31:f4b9b85c7b62 20 3. Neither the name of the copyright holders nor the
Pokitto 31:f4b9b85c7b62 21 names of its contributors may be used to endorse or promote products
Pokitto 31:f4b9b85c7b62 22 derived from this software without specific prior written permission.
Pokitto 31:f4b9b85c7b62 23
Pokitto 31:f4b9b85c7b62 24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
Pokitto 31:f4b9b85c7b62 25 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
Pokitto 31:f4b9b85c7b62 26 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
Pokitto 31:f4b9b85c7b62 27 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
Pokitto 31:f4b9b85c7b62 28 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
Pokitto 31:f4b9b85c7b62 29 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
Pokitto 31:f4b9b85c7b62 30 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
Pokitto 31:f4b9b85c7b62 31 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
Pokitto 31:f4b9b85c7b62 32 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
Pokitto 31:f4b9b85c7b62 33 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Pokitto 31:f4b9b85c7b62 34 */
Pokitto 31:f4b9b85c7b62 35 /**************************************************************************/
Pokitto 31:f4b9b85c7b62 36
Pokitto 31:f4b9b85c7b62 37 #include "Synth.h"
Pokitto 31:f4b9b85c7b62 38
Pokitto 31:f4b9b85c7b62 39 uint16_t noiseval, noiseval2;
Pokitto 31:f4b9b85c7b62 40
Pokitto 31:f4b9b85c7b62 41 void waveoff(OSC* o); void sqwave(OSC* o); void sawwave(OSC* o); void triwave(OSC* o); void noise(OSC* o); void tonenoise(OSC* o); void sample(OSC* o);
Pokitto 31:f4b9b85c7b62 42 void noADSR(OSC* o); void attackFunc(OSC* o); void decayFunc(OSC* o); void releaseFunc(OSC* o);
Pokitto 31:f4b9b85c7b62 43 void mix1(); void mix2(); void mix3(); void updateEnvelopes();
Pokitto 31:f4b9b85c7b62 44
Pokitto 31:f4b9b85c7b62 45 waveFunction Farr [] = {waveoff, sqwave, sawwave, triwave, noise, tonenoise};
Pokitto 31:f4b9b85c7b62 46 envFunction Earr [] = {noADSR, attackFunc, decayFunc, releaseFunc};
Pokitto 31:f4b9b85c7b62 47 mixFunction Marr [] = {updateEnvelopes,mix3,mix2,mix1}; // counts down
Pokitto 31:f4b9b85c7b62 48 mixFunction HWMarr [] = {updateEnvelopes,mix3,mix2,mix1}; // counts down
Pokitto 31:f4b9b85c7b62 49
Pokitto 31:f4b9b85c7b62 50 /** SOUND FUNCTIONS **/
Pokitto 31:f4b9b85c7b62 51
Pokitto 31:f4b9b85c7b62 52 void waveoff(OSC* o){
Pokitto 31:f4b9b85c7b62 53 o->output = 0;
Pokitto 31:f4b9b85c7b62 54 }
Pokitto 31:f4b9b85c7b62 55
Pokitto 31:f4b9b85c7b62 56 void sqwave(OSC* o){
Pokitto 31:f4b9b85c7b62 57 // square. If bit 16 set, its 2nd half of cycle and then output. if not, silence.
Pokitto 31:f4b9b85c7b62 58 if (o->count & 0x80000000) o->output = 0;
Pokitto 31:f4b9b85c7b62 59 else
Pokitto 31:f4b9b85c7b62 60 o->output = 0xFFFF;
Pokitto 31:f4b9b85c7b62 61 }
Pokitto 31:f4b9b85c7b62 62
Pokitto 31:f4b9b85c7b62 63 void sawwave(OSC* o){
Pokitto 31:f4b9b85c7b62 64 // saw is just twice the count, so it happens 2 times in a cycle.
Pokitto 31:f4b9b85c7b62 65 o->output = (o->count >>15); //its now 32 bits (o->count << 1)>>4; // simple, eh ?
Pokitto 31:f4b9b85c7b62 66 }
Pokitto 31:f4b9b85c7b62 67
Pokitto 31:f4b9b85c7b62 68 void triwave(OSC* o){
Pokitto 31:f4b9b85c7b62 69 // exploit the fact that above 0x7FFF bit 16 will be set (ie. when on second side of cycle)
Pokitto 31:f4b9b85c7b62 70 if (o->count & 0x80000000) o->output = (~o->count) >>15;// << 1; // counts down because complement goes other way
Pokitto 31:f4b9b85c7b62 71 else o->output = o->count >>15; // now 32 bits ! << 1; // count up on first side of cycle
Pokitto 31:f4b9b85c7b62 72 }
Pokitto 31:f4b9b85c7b62 73
Pokitto 31:f4b9b85c7b62 74 void noise(OSC* o){
Pokitto 31:f4b9b85c7b62 75 // Standard libc random gives 10-12 fps
Pokitto 31:f4b9b85c7b62 76 // Xorshift16 gives 32-39 fps
Pokitto 31:f4b9b85c7b62 77 // Xorshift8 gives
Pokitto 31:f4b9b85c7b62 78
Pokitto 31:f4b9b85c7b62 79 if (o->count > 0x80000000) {
Pokitto 31:f4b9b85c7b62 80 o->output = noiseval2;
Pokitto 31:f4b9b85c7b62 81 //noiseval = random(0,0xFFFF);
Pokitto 31:f4b9b85c7b62 82 noiseval = xorshift16();
Pokitto 31:f4b9b85c7b62 83 //noiseval = xorshift8()*256;
Pokitto 31:f4b9b85c7b62 84 }
Pokitto 31:f4b9b85c7b62 85 else {
Pokitto 31:f4b9b85c7b62 86 o->output = noiseval;
Pokitto 31:f4b9b85c7b62 87 //noiseval2 = random(0,0xFFFF);
Pokitto 31:f4b9b85c7b62 88 noiseval2 = xorshift16();
Pokitto 31:f4b9b85c7b62 89 //noiseval2 = xorshift8()*256;
Pokitto 31:f4b9b85c7b62 90 }
Pokitto 31:f4b9b85c7b62 91 }
Pokitto 31:f4b9b85c7b62 92
Pokitto 31:f4b9b85c7b62 93 void tonenoise(OSC* o){
Pokitto 31:f4b9b85c7b62 94 // square. If bit 16 set, its 2nd half of cycle and then output. if not, silence.
Pokitto 31:f4b9b85c7b62 95 if (o->count & 0x80000000) o->output = (xorshift16()>>6); //was 0
Pokitto 31:f4b9b85c7b62 96 else o->output = (xorshift16()>>1) + 0x4000;//random(0,0xFFFF);
Pokitto 31:f4b9b85c7b62 97 }
Pokitto 31:f4b9b85c7b62 98
Pokitto 31:f4b9b85c7b62 99 void sample(OSC* o) {
Pokitto 31:f4b9b85c7b62 100
Pokitto 31:f4b9b85c7b62 101 /*if (o->samplepos > o->samplelength ) o->samplepos = 0;
Pokitto 31:f4b9b85c7b62 102
Pokitto 31:f4b9b85c7b62 103 if (o->count > o->wcycle) {
Pokitto 31:f4b9b85c7b62 104 o->count=0;
Pokitto 31:f4b9b85c7b62 105 if (o->output) o->output = 0;
Pokitto 31:f4b9b85c7b62 106 //else o->output = o->output=pgm_read_byte((uint32_t)(sfxBike) + o->inccount);
Pokitto 31:f4b9b85c7b62 107 }*/
Pokitto 31:f4b9b85c7b62 108 }
Pokitto 31:f4b9b85c7b62 109
Pokitto 31:f4b9b85c7b62 110