David Bottrill / Mbed 2 deprecated MIDI_Pipe_Organ

USBMIDI sampled pipe organ uses real pipe organ samples to produce a realistic sound with 16 note polyphony. A serial output will drive external TPIC6A596 shift registers that could be used to drive pipe organ magnets (Solenoid valves)

Dependencies:   TextLCD USBDevice mbed

main.cpp@6:073e10217962, 2015-11-02 (annotated)

Committer:
djbottrill
Date:
Mon Nov 02 16:41:28 2015 +0000
Revision:
6:073e10217962
Parent:
5:13a1e5e4494d
Child:
7:e1ea1623c6c2
Moved switch de-bounce code to the mail loop from the ticker to reduce ticker processing time.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
djbottrill 0:4d06e0867376 1 /*
djbottrill 0:4d06e0867376 2 Program to drive organ magnets from a MIDI input
djbottrill 0:4d06e0867376 3 From Midi note 36 the notes are send to a 96 bit shift register organ magnet driver board based on 12 x TPIC6B595 shift registers
djbottrill 0:4d06e0867376 4 The program uses the DAC to generate 16 sampled audio channel outputs at 22.05Khz that mirror the solenoid outputs, but also run from
djbottrill 0:4d06e0867376 5 MIDI note 24 so the bottom 16' octave can be generated electronically if 16' pipes are not feasible.
djbottrill 0:4d06e0867376 6 In fact the sampled output could be tailored to fill in any missing note ranges,
djbottrill 0:4d06e0867376 7 Repeated pressing sw3 cycles through a number of display modes.
djbottrill 0:4d06e0867376 8 */
djbottrill 0:4d06e0867376 9 #include "mbed.h"
djbottrill 0:4d06e0867376 10
djbottrill 5:13a1e5e4494d 11 //#include "Rohrflute.h"
djbottrill 2:8b22402c0b0f 12 //#include "Dubbelflojt.h"
djbottrill 2:8b22402c0b0f 13 //#include "Principal.h"
djbottrill 5:13a1e5e4494d 14 #include "Bourdon.h" //This is the best sample
djbottrill 0:4d06e0867376 15
djbottrill 0:4d06e0867376 16 #include "USBMIDI.h"
djbottrill 0:4d06e0867376 17
djbottrill 0:4d06e0867376 18 #include "TextLCD.h"
djbottrill 0:4d06e0867376 19 //For Linksprite LCD Shield
djbottrill 0:4d06e0867376 20 //TextLCD lcd(PTC12, D9, D4, D5, D6, D7); // rs, e, d4-d7
djbottrill 0:4d06e0867376 21 //DigitalOut bl(D10);
djbottrill 0:4d06e0867376 22 //D8 is wrong on K64F definition it is actually PTC12 not PTA0
djbottrill 0:4d06e0867376 23
djbottrill 0:4d06e0867376 24 //For Midas 2x16 OLED Display
djbottrill 0:4d06e0867376 25 TextLCD lcd (D2, D3, D4, D5,D6, D7, TextLCD::LCD16x2, NC, NC, TextLCD::WS0010 ); // 4bit bus: RS, E, D4-D7, LCDType=LCD16x2, BL=NC, E2=NC, LCDTCtrl=WS0010
djbottrill 0:4d06e0867376 26
djbottrill 0:4d06e0867376 27 //Serial pc(USBTX, USBRX); // tx, rx
djbottrill 0:4d06e0867376 28
djbottrill 0:4d06e0867376 29 AnalogOut Aout(DAC0_OUT);
djbottrill 0:4d06e0867376 30
djbottrill 0:4d06e0867376 31 DigitalOut redled(LED1);
djbottrill 0:4d06e0867376 32 DigitalOut greenled(LED2);
djbottrill 0:4d06e0867376 33 DigitalOut blueled(LED3);
djbottrill 0:4d06e0867376 34
djbottrill 0:4d06e0867376 35 DigitalOut diag(D15);
djbottrill 0:4d06e0867376 36 DigitalOut diag2(D14);
djbottrill 0:4d06e0867376 37
djbottrill 0:4d06e0867376 38 DigitalIn sw1(PTC6);
djbottrill 0:4d06e0867376 39 DigitalIn sw3(PTA4);
djbottrill 0:4d06e0867376 40
djbottrill 0:4d06e0867376 41 //Wi-Fi connector J6 note pin 3 is incorrectly idenifed in the documentation as PTC12
djbottrill 0:4d06e0867376 42 DigitalOut SRCK(PTD7); //Shift Register clock
djbottrill 0:4d06e0867376 43 DigitalOut RCK(PTD5); //Shift Register latch
djbottrill 0:4d06e0867376 44 DigitalOut SER1(PTB20); //Shift Register serial data outout
djbottrill 0:4d06e0867376 45
djbottrill 0:4d06e0867376 46
djbottrill 0:4d06e0867376 47 Ticker output_ticker; //22.05Khz Ticker for sound generation
djbottrill 0:4d06e0867376 48
djbottrill 0:4d06e0867376 49 int keybuf[128]= {};
djbottrill 0:4d06e0867376 50 int oldkeybuf[128]= {};
djbottrill 0:4d06e0867376 51 int keystat[128]= {};
djbottrill 0:4d06e0867376 52 int keyidx=0; //Key index //Polyphony counter
djbottrill 0:4d06e0867376 53 int outidx=96; //Serial output index
djbottrill 0:4d06e0867376 54
djbottrill 0:4d06e0867376 55 int key=0;
djbottrill 0:4d06e0867376 56 int velocity=0;
djbottrill 0:4d06e0867376 57 int chan=0;
djbottrill 0:4d06e0867376 58 int onoff=0;
djbottrill 0:4d06e0867376 59
djbottrill 0:4d06e0867376 60 unsigned int audio_out; //Audio output value accumulator
djbottrill 0:4d06e0867376 61
djbottrill 0:4d06e0867376 62 //OLELD display bar graph characters
djbottrill 0:4d06e0867376 63 const char udc0[] = {0x15, 0x00, 0x00, 0x00, 0x00, 0x00, 0x15, 0x00};
djbottrill 0:4d06e0867376 64 const char udc1[] = {0x15, 0x10, 0x10, 0x10, 0x10, 0x10, 0x15, 0x00};
djbottrill 0:4d06e0867376 65 const char udc2[] = {0x15, 0x04, 0x04, 0x04, 0x04, 0x04, 0x15, 0x00};
djbottrill 0:4d06e0867376 66 const char udc3[] = {0x15, 0x14, 0x14, 0x14, 0x14, 0x14, 0x15, 0x00};
djbottrill 0:4d06e0867376 67 const char udc4[] = {0x15, 0x01, 0x01, 0x01, 0x01, 0x01, 0x15, 0x00};
djbottrill 0:4d06e0867376 68 const char udc5[] = {0x15, 0x11, 0x11, 0x11, 0x11, 0x11, 0x15, 0x00};
djbottrill 0:4d06e0867376 69 const char udc6[] = {0x15, 0x05, 0x05, 0x05, 0x05, 0x05, 0x15, 0x00};
djbottrill 0:4d06e0867376 70 const char udc7[] = {0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x00};
djbottrill 0:4d06e0867376 71
djbottrill 0:4d06e0867376 72 //Variables for LCD/OLED display
djbottrill 0:4d06e0867376 73 unsigned long int lcd_stat=0;
djbottrill 0:4d06e0867376 74 unsigned long int lcd_stat_old=1;
djbottrill 0:4d06e0867376 75 char display[2][16]; //Display Buffer
djbottrill 0:4d06e0867376 76 char display_old[2][16]; //Old Display Buffer
djbottrill 0:4d06e0867376 77 int pos=0; //Display Position counter
djbottrill 0:4d06e0867376 78 int row=0;
djbottrill 0:4d06e0867376 79 int tval=0;
djbottrill 0:4d06e0867376 80 int keyidx_t=0;
djbottrill 0:4d06e0867376 81 int lcdmode=0; //LCD Display Mode
djbottrill 0:4d06e0867376 82
djbottrill 0:4d06e0867376 83 int sw1_count=0; //Switch de-bounce counter
djbottrill 0:4d06e0867376 84 int sw1_old=0;
djbottrill 0:4d06e0867376 85 int sw1_phase=0;
djbottrill 0:4d06e0867376 86 int sw3_count=0; //Switch de-bounce counter
djbottrill 0:4d06e0867376 87 int sw3_old=0;
djbottrill 0:4d06e0867376 88 int sw3_phase=0;
djbottrill 0:4d06e0867376 89
djbottrill 0:4d06e0867376 90 //Sound generator variables
djbottrill 0:4d06e0867376 91 int tempidx=0;
djbottrill 0:4d06e0867376 92 int freqidx=45;
djbottrill 0:4d06e0867376 93 float synth[16];
djbottrill 0:4d06e0867376 94 float synthidx[16];
djbottrill 0:4d06e0867376 95 int synth_old[16];
djbottrill 0:4d06e0867376 96 int synthtab[16]= {};
djbottrill 0:4d06e0867376 97 int synthstat[16]= {};
djbottrill 4:9f63e68b548e 98 unsigned char synthoctave[16]= {};
djbottrill 4:9f63e68b548e 99 unsigned char synthnote[16]= {};
djbottrill 0:4d06e0867376 100 int noteidx=0;
djbottrill 0:4d06e0867376 101 int i;
djbottrill 0:4d06e0867376 102 int ii;
djbottrill 0:4d06e0867376 103
djbottrill 0:4d06e0867376 104
djbottrill 0:4d06e0867376 105 /*
djbottrill 0:4d06e0867376 106 Ticker routine to calculate and output the audio signal.
djbottrill 0:4d06e0867376 107 As the DAC is 12 bit this allows for 16 concurrennt 8 bit samples running with no additional loss of precision.
djbottrill 0:4d06e0867376 108 The samples should be normalised to maximise the 8 bit range as only one sample is used there is no need to generate sounds with different amplitude.
djbottrill 5:13a1e5e4494d 109 Sound Generation is in 4 states stored in synthstat:
djbottrill 0:4d06e0867376 110 0 = Synth Channel idle
djbottrill 0:4d06e0867376 111 1 = Attack / Sustain phase note running and looping if necessary
djbottrill 5:13a1e5e4494d 112 2 = Signal to start decay this may be delayed until the sound is paat the initial attack point typically 100-200 mS
djbottrill 0:4d06e0867376 113 3 = Sample is in the decay phase.
djbottrill 0:4d06e0867376 114
djbottrill 5:13a1e5e4494d 115 This routine also handles the Synchronous output to a 96 bit shift register Organ Pallet magnet driver board, one bit is sent per tick.
djbottrill 0:4d06e0867376 116 The data clock pulse is generated during the 16 channel synth scan and the final latch pulse is generated on the 96th Tick.
djbottrill 0:4d06e0867376 117 All 96 bits are clocked out in around 4.4mS.
djbottrill 0:4d06e0867376 118 */
djbottrill 0:4d06e0867376 119 void aout()
djbottrill 0:4d06e0867376 120 {
djbottrill 4:9f63e68b548e 121 diag=1; //Pulse DIAG Pin for Scoping purposes IE pin high
djbottrill 0:4d06e0867376 122 redled=0; //Pulse Red LED to indicate Ticker working
djbottrill 0:4d06e0867376 123 audio_out=0; //Clear Audio Accumulator
djbottrill 0:4d06e0867376 124
djbottrill 0:4d06e0867376 125 SER1=keybuf[outidx+12]; //Send bit serially
djbottrill 0:4d06e0867376 126
djbottrill 0:4d06e0867376 127 for (i =0; i<16; i++) { //Do 16 channels
djbottrill 4:9f63e68b548e 128 switch (synthstat[i]) {
djbottrill 6:073e10217962 129 case 0:
djbottrill 6:073e10217962 130 break;
djbottrill 4:9f63e68b548e 131 case 1: //Sustain phase
djbottrill 4:9f63e68b548e 132 if (synth[i]>sample_loop_end[synthoctave[i]]) { //Got to end of buffer?
djbottrill 4:9f63e68b548e 133 synth[i]=sample_loop_start[synthoctave[i]]; //Wrap around back to start
djbottrill 4:9f63e68b548e 134 }
djbottrill 4:9f63e68b548e 135 break;
djbottrill 5:13a1e5e4494d 136 case 2: //Note off demand state
djbottrill 0:4d06e0867376 137 if (synth[i]>=sample_attack[synthoctave[i]]) { //Delay decay phase if not past end of attack
djbottrill 0:4d06e0867376 138 //Check if the waveform is close to zero crossing this helps eliminate clicks looks for rising edge approaching 0x80
djbottrill 0:4d06e0867376 139 tempidx=synth[i];
djbottrill 5:13a1e5e4494d 140 if (sample[synthoctave[i]][tempidx]<128 & sample[synthoctave[i]][tempidx]>120) {
djbottrill 0:4d06e0867376 141 if (sample[synthoctave[i]][tempidx]>synth_old[i]) {
djbottrill 5:13a1e5e4494d 142 synth[i]=sample_loop_off[synthoctave[i]]; //Jump to start of decay
djbottrill 5:13a1e5e4494d 143 synthstat[i]=3; //Say note in decay
djbottrill 0:4d06e0867376 144 }
djbottrill 0:4d06e0867376 145 }
djbottrill 0:4d06e0867376 146 }
djbottrill 4:9f63e68b548e 147 break;
djbottrill 0:4d06e0867376 148 }
djbottrill 4:9f63e68b548e 149
djbottrill 4:9f63e68b548e 150 //get sample and add to Audio Accumulator
djbottrill 0:4d06e0867376 151 tempidx=synth[i]; //Convert to integer
djbottrill 0:4d06e0867376 152 synth_old[i]=sample[synthoctave[i]][tempidx]; //Get and save old sample
djbottrill 6:073e10217962 153
djbottrill 0:4d06e0867376 154 audio_out=audio_out+synth_old[i]; //add sample to audio out accumulator
djbottrill 0:4d06e0867376 155 synth[i]=synth[i]+synthidx[i]; //Get next sample pointer
djbottrill 0:4d06e0867376 156
djbottrill 0:4d06e0867376 157 //Check if decay has completed
djbottrill 0:4d06e0867376 158 if (synth[i]>=sample_len[synthoctave[i]]) { //End of decay?
djbottrill 0:4d06e0867376 159 synthstat[i]=0; //say channel free
djbottrill 0:4d06e0867376 160 synth[i]=0; //Set sample pointer to 0
djbottrill 0:4d06e0867376 161 synthidx[i]=0; //Set sample index to 0
djbottrill 0:4d06e0867376 162 synthtab[i]=255; //Set to invalid
djbottrill 0:4d06e0867376 163 }
djbottrill 0:4d06e0867376 164
djbottrill 0:4d06e0867376 165 //Generate clock pulses to send data serially
djbottrill 4:9f63e68b548e 166 switch (i) {
djbottrill 4:9f63e68b548e 167 case 2:
djbottrill 4:9f63e68b548e 168 SRCK=1; //Generate serial output clock pulse
djbottrill 4:9f63e68b548e 169 break;
djbottrill 4:9f63e68b548e 170 case 5:
djbottrill 4:9f63e68b548e 171 SRCK=0;
djbottrill 4:9f63e68b548e 172 break;
djbottrill 4:9f63e68b548e 173 case 10:
djbottrill 4:9f63e68b548e 174 if (outidx==0) {
djbottrill 4:9f63e68b548e 175 RCK=1; //Generate latch strobe after 96 bits sent
djbottrill 4:9f63e68b548e 176 }
djbottrill 4:9f63e68b548e 177 break;
djbottrill 4:9f63e68b548e 178 case 15:
djbottrill 4:9f63e68b548e 179 if (outidx==0) {
djbottrill 4:9f63e68b548e 180 RCK=0; //Generate latch strobe after 96 bits sent
djbottrill 4:9f63e68b548e 181 outidx=96;
djbottrill 4:9f63e68b548e 182 }
djbottrill 4:9f63e68b548e 183 break;
djbottrill 0:4d06e0867376 184 }
djbottrill 4:9f63e68b548e 185
djbottrill 0:4d06e0867376 186 } //Next Note
djbottrill 0:4d06e0867376 187 outidx--; //Next serial data bit
djbottrill 0:4d06e0867376 188
djbottrill 0:4d06e0867376 189 //Output to DAC
djbottrill 0:4d06e0867376 190 Aout.write_u16(audio_out*16);
djbottrill 6:073e10217962 191
djbottrill 0:4d06e0867376 192 redled=1;
djbottrill 0:4d06e0867376 193 diag=0;
djbottrill 0:4d06e0867376 194 }
djbottrill 0:4d06e0867376 195
djbottrill 0:4d06e0867376 196 /*
djbottrill 0:4d06e0867376 197 Interrupt routine to receive MIDI on/off message and set LED status accordingly
djbottrill 0:4d06e0867376 198 MIDI note on/off events directly start/stop the synth channels and store the note status in keytab.
djbottrill 0:4d06e0867376 199 */
djbottrill 0:4d06e0867376 200 void get_message(MIDIMessage msg)
djbottrill 0:4d06e0867376 201 {
djbottrill 0:4d06e0867376 202 greenled=0; //Pulse Green LED to indicate MIDI activity
djbottrill 0:4d06e0867376 203 key=msg.key();
djbottrill 0:4d06e0867376 204 velocity=msg.velocity();
djbottrill 0:4d06e0867376 205 chan=msg.channel();
djbottrill 0:4d06e0867376 206 switch (msg.type()) {
djbottrill 0:4d06e0867376 207 case MIDIMessage::NoteOnType: //MIDI note on received
djbottrill 0:4d06e0867376 208 if (key>23) {
djbottrill 0:4d06e0867376 209 onoff=1;
djbottrill 0:4d06e0867376 210 keybuf[(key-24)]=1; //Store in keybuf, except for notes 24-35
djbottrill 0:4d06e0867376 211 //Process keys on
djbottrill 0:4d06e0867376 212 //Find a free note generator and start the note playing, if no slots available just ignore the note
djbottrill 0:4d06e0867376 213 for (ii=0; ii<16; ii++) {
djbottrill 5:13a1e5e4494d 214 if (synthtab[ii]==(key-24) & synthstat[ii]>0) { //Is synth already playing the note?
djbottrill 6:073e10217962 215 synth[ii]=0; //Set sample pointer to 0
djbottrill 5:13a1e5e4494d 216 synthstat[ii]=1; //Restart the note
djbottrill 5:13a1e5e4494d 217 break; //exit loop
djbottrill 5:13a1e5e4494d 218 }
djbottrill 5:13a1e5e4494d 219 if (synthstat[ii]==0) { //Is synth channel free?
djbottrill 0:4d06e0867376 220 synthtab[ii]=key-24; //Store note value
djbottrill 0:4d06e0867376 221 synthoctave[ii]=synthtab[ii]/12; //Store the octave
djbottrill 4:9f63e68b548e 222 synthnote[ii]= synthtab[ii]%12; //Note within the octave
djbottrill 0:4d06e0867376 223 synthstat[ii]=1; //Set status to playing
djbottrill 0:4d06e0867376 224 synthidx[ii]=freqtab[synthnote[ii]]; //Set the frequency
djbottrill 5:13a1e5e4494d 225 break; //exit loop
djbottrill 0:4d06e0867376 226 } //Next Synth slot
djbottrill 0:4d06e0867376 227 }
djbottrill 0:4d06e0867376 228 }
djbottrill 6:073e10217962 229
djbottrill 0:4d06e0867376 230 break;
djbottrill 0:4d06e0867376 231
djbottrill 0:4d06e0867376 232 //Process keys off
djbottrill 0:4d06e0867376 233 case MIDIMessage::NoteOffType: //Midi note off received
djbottrill 0:4d06e0867376 234 if (key>23) {
djbottrill 0:4d06e0867376 235 onoff=0;
djbottrill 0:4d06e0867376 236 keybuf[(key-24)]=0; //Update keybuf
djbottrill 0:4d06e0867376 237 for (ii=0; ii<16; ii++) {
djbottrill 5:13a1e5e4494d 238 if (synthstat[ii]==1 & synthtab[ii]==(key-24)) { //Note currently playing
djbottrill 0:4d06e0867376 239 synthstat[ii]=2; //Set Start decay
djbottrill 5:13a1e5e4494d 240 break; //Exit loop
djbottrill 0:4d06e0867376 241 }
djbottrill 0:4d06e0867376 242 }
djbottrill 0:4d06e0867376 243 }
djbottrill 0:4d06e0867376 244 break;
djbottrill 0:4d06e0867376 245
djbottrill 0:4d06e0867376 246 //Process all notes off command
djbottrill 0:4d06e0867376 247 case MIDIMessage::AllNotesOffType: //Midi all notes off
djbottrill 0:4d06e0867376 248 for (ii=0; ii<108; i++) {
djbottrill 0:4d06e0867376 249 keybuf[ii]=0; //Clear Keybuf
djbottrill 0:4d06e0867376 250 }
djbottrill 0:4d06e0867376 251 for (ii=0; ii>16; ii++) { //Kill any sampled notes playing
djbottrill 0:4d06e0867376 252 synthstat[ii]=0; //say channel free
djbottrill 0:4d06e0867376 253 synth[ii]=0; //Set sample pointer to 0
djbottrill 0:4d06e0867376 254 synthidx[ii]=0; //Set sample index to 0
djbottrill 0:4d06e0867376 255 synthtab[ii]=255; //Set to invalid
djbottrill 0:4d06e0867376 256 }
djbottrill 0:4d06e0867376 257 break;
djbottrill 4:9f63e68b548e 258
djbottrill 0:4d06e0867376 259 //Any other MIDI Commands just ignore
djbottrill 0:4d06e0867376 260 default:
djbottrill 0:4d06e0867376 261 break;
djbottrill 0:4d06e0867376 262 }
djbottrill 0:4d06e0867376 263 greenled=1;
djbottrill 0:4d06e0867376 264 }
djbottrill 0:4d06e0867376 265
djbottrill 0:4d06e0867376 266
djbottrill 0:4d06e0867376 267 int main()
djbottrill 0:4d06e0867376 268 {
djbottrill 0:4d06e0867376 269 greenled=1;
djbottrill 0:4d06e0867376 270 redled=1;
djbottrill 0:4d06e0867376 271 blueled=1;
djbottrill 0:4d06e0867376 272 SRCK=0; //Serial Clock low
djbottrill 0:4d06e0867376 273 RCK=0; //Latch Clock low
djbottrill 0:4d06e0867376 274
djbottrill 0:4d06e0867376 275 sw1.mode(PullUp);
djbottrill 0:4d06e0867376 276 sw3.mode(PullUp);
djbottrill 0:4d06e0867376 277
djbottrill 0:4d06e0867376 278 output_ticker.attach(&aout, sample_rate); //Set Sample frequency
djbottrill 0:4d06e0867376 279
djbottrill 0:4d06e0867376 280 lcd.cls();
djbottrill 0:4d06e0867376 281 wait(0.1);
djbottrill 0:4d06e0867376 282 lcd.setCursor(TextLCD::CurOff_BlkOff);
djbottrill 0:4d06e0867376 283 lcd.cls();
djbottrill 0:4d06e0867376 284 lcd.printf("MIDI Pipe Organ Waiting for USB");
djbottrill 0:4d06e0867376 285
djbottrill 0:4d06e0867376 286 NVIC_SetPriority(USB0_IRQn, 99); //Reduce Interrupt priority of USB
djbottrill 0:4d06e0867376 287
djbottrill 0:4d06e0867376 288 USBMIDI midi; //Start up MIDI
djbottrill 0:4d06e0867376 289 midi.attach(get_message); //callback for MIDI messages received
djbottrill 0:4d06e0867376 290
djbottrill 0:4d06e0867376 291 lcd.cls();
djbottrill 0:4d06e0867376 292 lcd.printf("MIDI Pipe Organ");
djbottrill 0:4d06e0867376 293 wait(1);
djbottrill 0:4d06e0867376 294 lcd.cls();
djbottrill 0:4d06e0867376 295 lcd.printf("On Chan Note Vel");
djbottrill 0:4d06e0867376 296 //Program user defined characters into OLED display for bar graph
djbottrill 0:4d06e0867376 297 lcd.setUDC(0, (char *) udc0);
djbottrill 0:4d06e0867376 298 lcd.setUDC(1, (char *) udc1);
djbottrill 0:4d06e0867376 299 lcd.setUDC(2, (char *) udc2);
djbottrill 0:4d06e0867376 300 lcd.setUDC(3, (char *) udc3);
djbottrill 0:4d06e0867376 301 lcd.setUDC(4, (char *) udc4);
djbottrill 0:4d06e0867376 302 lcd.setUDC(5, (char *) udc5);
djbottrill 0:4d06e0867376 303 lcd.setUDC(6, (char *) udc6);
djbottrill 0:4d06e0867376 304 lcd.setUDC(7, (char *) udc7);
djbottrill 0:4d06e0867376 305
djbottrill 0:4d06e0867376 306 key=0;
djbottrill 0:4d06e0867376 307 velocity=0;
djbottrill 0:4d06e0867376 308 chan=0;
djbottrill 0:4d06e0867376 309 onoff=0;
djbottrill 0:4d06e0867376 310
djbottrill 0:4d06e0867376 311 //Main Loop
djbottrill 0:4d06e0867376 312 while(1) {
djbottrill 0:4d06e0867376 313
djbottrill 6:073e10217962 314 /*
djbottrill 6:073e10217962 315 Additional code to de-bounce the K64F onboard switches again using multiple ticks to de-bounce; has 4 states:
djbottrill 6:073e10217962 316 0 - Button not pressed
djbottrill 6:073e10217962 317 1 - Button pressed waiting for de-bounce count of 100 ticks (4.53 mS)
djbottrill 6:073e10217962 318 2 - Button press stable, this staus can be read as the de-bounced status indicating the button press is clean
djbottrill 6:073e10217962 319 */
djbottrill 6:073e10217962 320 // De-bounce SW1
djbottrill 6:073e10217962 321 if (sw1_phase==0 & sw1==0) { //Button just been pressed
djbottrill 6:073e10217962 322 sw1_phase=1;
djbottrill 6:073e10217962 323 sw1_count=10;
djbottrill 6:073e10217962 324 }
djbottrill 6:073e10217962 325 if (sw1_phase==1 & sw1_count==0 & sw1==0) { //Button still pressed after de-bounce period
djbottrill 6:073e10217962 326 sw1_phase=2;
djbottrill 6:073e10217962 327 }
djbottrill 6:073e10217962 328 if (sw1_phase==2 & sw1==1) { //Button released
djbottrill 6:073e10217962 329 sw1_phase=0;
djbottrill 6:073e10217962 330 }
djbottrill 6:073e10217962 331 sw1_count--;
djbottrill 6:073e10217962 332 // De-bounce SW1
djbottrill 6:073e10217962 333 if (sw3_phase==0 & sw3==0) { //Button just been pressed
djbottrill 6:073e10217962 334 sw3_phase=1;
djbottrill 6:073e10217962 335 sw3_count=10;
djbottrill 6:073e10217962 336 }
djbottrill 6:073e10217962 337 if (sw3_phase==1 & sw3_count==0 & sw3==0) { //Button still pressed after de-bounce period
djbottrill 6:073e10217962 338 sw3_phase=2;
djbottrill 6:073e10217962 339 }
djbottrill 6:073e10217962 340
djbottrill 6:073e10217962 341 if (sw3_phase==2 & sw3==1) { //Button released
djbottrill 6:073e10217962 342 sw3_phase=0;
djbottrill 6:073e10217962 343 }
djbottrill 6:073e10217962 344 sw3_count--;
djbottrill 6:073e10217962 345
djbottrill 6:073e10217962 346
djbottrill 6:073e10217962 347
djbottrill 6:073e10217962 348
djbottrill 0:4d06e0867376 349 if (sw1_phase==2 | sw3_phase==2) {
djbottrill 0:4d06e0867376 350 blueled=0;
djbottrill 0:4d06e0867376 351 } else {
djbottrill 0:4d06e0867376 352 blueled=1;
djbottrill 0:4d06e0867376 353 }
djbottrill 0:4d06e0867376 354
djbottrill 0:4d06e0867376 355
djbottrill 0:4d06e0867376 356 //Check for display mode button being presed
djbottrill 0:4d06e0867376 357 if (sw3_phase != sw3_old) { //Mode Switch pressed
djbottrill 0:4d06e0867376 358 if(sw3_phase==2) {
djbottrill 0:4d06e0867376 359 lcdmode++;
djbottrill 0:4d06e0867376 360 if (lcdmode>2) {
djbottrill 0:4d06e0867376 361 lcdmode=0;
djbottrill 0:4d06e0867376 362 }
djbottrill 0:4d06e0867376 363 lcd.cls();
djbottrill 0:4d06e0867376 364 if (lcdmode==0) {
djbottrill 0:4d06e0867376 365 lcd.printf("On Chan Note Vel");
djbottrill 0:4d06e0867376 366 }
djbottrill 0:4d06e0867376 367 if (lcdmode==1) {
djbottrill 0:4d06e0867376 368 //Initialise bar graph display
djbottrill 0:4d06e0867376 369
djbottrill 0:4d06e0867376 370 for (row=0; row<2; row++) {
djbottrill 0:4d06e0867376 371 for (pos=0; pos<16; pos++) {
djbottrill 0:4d06e0867376 372 display[row][pos]=0;
djbottrill 0:4d06e0867376 373 display_old[row][pos]=1;
djbottrill 0:4d06e0867376 374 }
djbottrill 0:4d06e0867376 375 }
djbottrill 0:4d06e0867376 376 }
djbottrill 0:4d06e0867376 377 if (lcdmode==2) {
djbottrill 0:4d06e0867376 378 lcd.locate(0,1);
djbottrill 0:4d06e0867376 379 lcd.printf("0123456789ABCDEF");
djbottrill 0:4d06e0867376 380 }
djbottrill 0:4d06e0867376 381 }
djbottrill 0:4d06e0867376 382 }
djbottrill 0:4d06e0867376 383 sw3_old=sw3_phase;
djbottrill 0:4d06e0867376 384
djbottrill 0:4d06e0867376 385
djbottrill 0:4d06e0867376 386
djbottrill 0:4d06e0867376 387 // OLED MIDI Status display
djbottrill 0:4d06e0867376 388 if (lcdmode==0) {
djbottrill 0:4d06e0867376 389 lcd_stat=key+(128*velocity)+(16384*chan)+(262144*onoff);
djbottrill 0:4d06e0867376 390 if (lcd_stat!=lcd_stat_old) {
djbottrill 0:4d06e0867376 391
djbottrill 0:4d06e0867376 392 lcd.locate(0,1);
djbottrill 0:4d06e0867376 393 lcd.printf("%1d %2d %3d %3d", onoff, chan, key, velocity);
djbottrill 0:4d06e0867376 394 lcd_stat_old=lcd_stat;
djbottrill 0:4d06e0867376 395 }
djbottrill 0:4d06e0867376 396 }
djbottrill 0:4d06e0867376 397
djbottrill 0:4d06e0867376 398 // OLED MIDI Bar Display
djbottrill 0:4d06e0867376 399 if (lcdmode==1) {
djbottrill 0:4d06e0867376 400 keyidx=0;
djbottrill 0:4d06e0867376 401 for (row=1; row>=0; row--) {
djbottrill 0:4d06e0867376 402 for (pos=0; pos<16; pos++) {
djbottrill 0:4d06e0867376 403 keyidx_t=keyidx*2;
djbottrill 0:4d06e0867376 404 if(keyidx_t>94) {
djbottrill 0:4d06e0867376 405 keyidx_t=keyidx_t-95;
djbottrill 0:4d06e0867376 406 }
djbottrill 0:4d06e0867376 407 tval=keybuf[keyidx_t];
djbottrill 0:4d06e0867376 408 keyidx++;
djbottrill 0:4d06e0867376 409 keyidx_t=keyidx*2;
djbottrill 0:4d06e0867376 410 if(keyidx_t>94) {
djbottrill 0:4d06e0867376 411 keyidx_t=keyidx_t-95;
djbottrill 0:4d06e0867376 412 }
djbottrill 0:4d06e0867376 413 tval=tval+(2*keybuf[keyidx_t]);
djbottrill 0:4d06e0867376 414 keyidx++;
djbottrill 0:4d06e0867376 415
djbottrill 0:4d06e0867376 416 keyidx_t=keyidx*2;
djbottrill 0:4d06e0867376 417 if(keyidx_t>94) {
djbottrill 0:4d06e0867376 418 keyidx_t=keyidx_t-95;
djbottrill 0:4d06e0867376 419 }
djbottrill 0:4d06e0867376 420 tval=tval+(4*keybuf[keyidx_t]);
djbottrill 0:4d06e0867376 421 keyidx++;
djbottrill 0:4d06e0867376 422 display[row][pos]=tval;
djbottrill 0:4d06e0867376 423
djbottrill 0:4d06e0867376 424 if(display[row][pos]!=display_old[row][pos]) {
djbottrill 0:4d06e0867376 425 lcd.locate(pos,row);
djbottrill 0:4d06e0867376 426 lcd.putc(display[row][pos]);
djbottrill 0:4d06e0867376 427 display_old[row][pos]=display[row][pos];
djbottrill 0:4d06e0867376 428 }
djbottrill 0:4d06e0867376 429 }
djbottrill 0:4d06e0867376 430 }
djbottrill 0:4d06e0867376 431 }
djbottrill 0:4d06e0867376 432
djbottrill 0:4d06e0867376 433 //Display status of the Synth channels
djbottrill 0:4d06e0867376 434 if (lcdmode==2) {
djbottrill 0:4d06e0867376 435 lcd.locate(0,0);
djbottrill 0:4d06e0867376 436 for (noteidx=0; noteidx<16; noteidx++) {
djbottrill 0:4d06e0867376 437 lcd.putc((synthstat[noteidx]+48));
djbottrill 0:4d06e0867376 438 }
djbottrill 0:4d06e0867376 439 }
djbottrill 4:9f63e68b548e 440
djbottrill 0:4d06e0867376 441 } //End of main loop
djbottrill 0:4d06e0867376 442 } //End of program
djbottrill 0:4d06e0867376 443
djbottrill 0:4d06e0867376 444
djbottrill 0:4d06e0867376 445
djbottrill 0:4d06e0867376 446