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@28:958b71c4b92a, 2018-01-05 (annotated)

Committer:
Pokitto
Date:
Fri Jan 05 02:19:51 2018 +0000
Revision:
28:958b71c4b92a
Parent:
0:e8b8f36b4505 
Sound level stored in EEPROM, sound output improved

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Pokitto 0:e8b8f36b4505 1 /**************************************************************************/
Pokitto 0:e8b8f36b4505 2 /*!
Pokitto 0:e8b8f36b4505 3 @file Synth_wavefuncs.cpp
Pokitto 0:e8b8f36b4505 4 @author Jonne Valola
Pokitto 0:e8b8f36b4505 5
Pokitto 0:e8b8f36b4505 6 @section LICENSE
Pokitto 0:e8b8f36b4505 7
Pokitto 0:e8b8f36b4505 8 Software License Agreement (BSD License)
Pokitto 0:e8b8f36b4505 9
Pokitto 0:e8b8f36b4505 10 Copyright (c) 2016, Jonne Valola
Pokitto 0:e8b8f36b4505 11 All rights reserved.
Pokitto 0:e8b8f36b4505 12
Pokitto 0:e8b8f36b4505 13 Redistribution and use in source and binary forms, with or without
Pokitto 0:e8b8f36b4505 14 modification, are permitted provided that the following conditions are met:
Pokitto 0:e8b8f36b4505 15 1. Redistributions of source code must retain the above copyright
Pokitto 0:e8b8f36b4505 16 notice, this list of conditions and the following disclaimer.
Pokitto 0:e8b8f36b4505 17 2. Redistributions in binary form must reproduce the above copyright
Pokitto 0:e8b8f36b4505 18 notice, this list of conditions and the following disclaimer in the
Pokitto 0:e8b8f36b4505 19 documentation and/or other materials provided with the distribution.
Pokitto 0:e8b8f36b4505 20 3. Neither the name of the copyright holders nor the
Pokitto 0:e8b8f36b4505 21 names of its contributors may be used to endorse or promote products
Pokitto 0:e8b8f36b4505 22 derived from this software without specific prior written permission.
Pokitto 0:e8b8f36b4505 23
Pokitto 0:e8b8f36b4505 24 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
Pokitto 0:e8b8f36b4505 25 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
Pokitto 0:e8b8f36b4505 26 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
Pokitto 0:e8b8f36b4505 27 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
Pokitto 0:e8b8f36b4505 28 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
Pokitto 0:e8b8f36b4505 29 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
Pokitto 0:e8b8f36b4505 30 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
Pokitto 0:e8b8f36b4505 31 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
Pokitto 0:e8b8f36b4505 32 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
Pokitto 0:e8b8f36b4505 33 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Pokitto 0:e8b8f36b4505 34 */
Pokitto 0:e8b8f36b4505 35 /**************************************************************************/
Pokitto 0:e8b8f36b4505 36
Pokitto 0:e8b8f36b4505 37 #include "Synth.h"
Pokitto 0:e8b8f36b4505 38
Pokitto 0:e8b8f36b4505 39 uint16_t noiseval, noiseval2;
Pokitto 0:e8b8f36b4505 40
Pokitto 0:e8b8f36b4505 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 0:e8b8f36b4505 42 void noADSR(OSC* o); void attackFunc(OSC* o); void decayFunc(OSC* o); void releaseFunc(OSC* o);
Pokitto 0:e8b8f36b4505 43 void mix1(); void mix2(); void mix3(); void updateEnvelopes();
Pokitto 0:e8b8f36b4505 44
Pokitto 0:e8b8f36b4505 45 waveFunction Farr [] = {waveoff, sqwave, sawwave, triwave, noise, tonenoise};
Pokitto 0:e8b8f36b4505 46 envFunction Earr [] = {noADSR, attackFunc, decayFunc, releaseFunc};
Pokitto 0:e8b8f36b4505 47 mixFunction Marr [] = {updateEnvelopes,mix3,mix2,mix1}; // counts down
Pokitto 0:e8b8f36b4505 48 mixFunction HWMarr [] = {updateEnvelopes,mix3,mix2,mix1}; // counts down
Pokitto 0:e8b8f36b4505 49
Pokitto 0:e8b8f36b4505 50 /** SOUND FUNCTIONS **/
Pokitto 0:e8b8f36b4505 51
Pokitto 0:e8b8f36b4505 52 void waveoff(OSC* o){
Pokitto 0:e8b8f36b4505 53 o->output = 0;
Pokitto 0:e8b8f36b4505 54 }
Pokitto 0:e8b8f36b4505 55
Pokitto 0:e8b8f36b4505 56 void sqwave(OSC* o){
Pokitto 0:e8b8f36b4505 57 // square. If bit 16 set, its 2nd half of cycle and then output. if not, silence.
Pokitto 0:e8b8f36b4505 58 if (o->count & 0x8000) o->output = 0;
Pokitto 0:e8b8f36b4505 59 else o->output = 0xFFFF;
Pokitto 0:e8b8f36b4505 60 }
Pokitto 0:e8b8f36b4505 61
Pokitto 0:e8b8f36b4505 62 void sawwave(OSC* o){
Pokitto 0:e8b8f36b4505 63 // saw is just twice the count, so it happens 2 times in a cycle.
Pokitto 0:e8b8f36b4505 64 o->output = o->count << 1; // simple, eh ?
Pokitto 0:e8b8f36b4505 65 }
Pokitto 0:e8b8f36b4505 66
Pokitto 0:e8b8f36b4505 67 void triwave(OSC* o){
Pokitto 0:e8b8f36b4505 68 // exploit the fact that above 0x7FFF bit 16 will be set (ie. when on second side of cycle)
Pokitto 0:e8b8f36b4505 69 if (o->count & 0x8000) o->output = (~o->count) << 1; // counts down because complement goes other way
Pokitto 0:e8b8f36b4505 70 else o->output = o->count << 1; // count up on first side of cycle
Pokitto 0:e8b8f36b4505 71 }
Pokitto 0:e8b8f36b4505 72
Pokitto 0:e8b8f36b4505 73 void noise(OSC* o){
Pokitto 0:e8b8f36b4505 74 // Standard libc random gives 10-12 fps
Pokitto 0:e8b8f36b4505 75 // Xorshift16 gives 32-39 fps
Pokitto 0:e8b8f36b4505 76 // Xorshift8 gives
Pokitto 0:e8b8f36b4505 77
Pokitto 0:e8b8f36b4505 78 if (o->count > 0x8000) {
Pokitto 0:e8b8f36b4505 79 o->output = noiseval2;
Pokitto 0:e8b8f36b4505 80 //noiseval = random(0,0xFFFF);
Pokitto 0:e8b8f36b4505 81 noiseval = xorshift16();
Pokitto 0:e8b8f36b4505 82 //noiseval = xorshift8()*256;
Pokitto 0:e8b8f36b4505 83 }
Pokitto 0:e8b8f36b4505 84 else {
Pokitto 0:e8b8f36b4505 85 o->output = noiseval;
Pokitto 0:e8b8f36b4505 86 //noiseval2 = random(0,0xFFFF);
Pokitto 0:e8b8f36b4505 87 noiseval2 = xorshift16();
Pokitto 0:e8b8f36b4505 88 //noiseval2 = xorshift8()*256;
Pokitto 0:e8b8f36b4505 89 }
Pokitto 0:e8b8f36b4505 90 }
Pokitto 0:e8b8f36b4505 91
Pokitto 0:e8b8f36b4505 92 void tonenoise(OSC* o){
Pokitto 0:e8b8f36b4505 93 // square. If bit 16 set, its 2nd half of cycle and then output. if not, silence.
Pokitto 0:e8b8f36b4505 94 if (o->count & 0x8000) o->output = (xorshift16()>>6); //was 0
Pokitto 0:e8b8f36b4505 95 else o->output = (xorshift16()>>1) + 0x4000;//random(0,0xFFFF);
Pokitto 0:e8b8f36b4505 96 }
Pokitto 0:e8b8f36b4505 97
Pokitto 0:e8b8f36b4505 98 void sample(OSC* o) {
Pokitto 0:e8b8f36b4505 99
Pokitto 0:e8b8f36b4505 100 /*if (o->samplepos > o->samplelength ) o->samplepos = 0;
Pokitto 0:e8b8f36b4505 101
Pokitto 0:e8b8f36b4505 102 if (o->count > o->wcycle) {
Pokitto 0:e8b8f36b4505 103 o->count=0;
Pokitto 0:e8b8f36b4505 104 if (o->output) o->output = 0;
Pokitto 0:e8b8f36b4505 105 //else o->output = o->output=pgm_read_byte((uint32_t)(sfxBike) + o->inccount);
Pokitto 0:e8b8f36b4505 106 }*/
Pokitto 0:e8b8f36b4505 107 }
Pokitto 0:e8b8f36b4505 108