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@4:9f63e68b548e, 2015-10-29 (annotated)

Committer:
djbottrill
Date:
Thu Oct 29 17:45:52 2015 +0000
Revision:
4:9f63e68b548e
Parent:
3:bc04c8daa46a
Child:
5:13a1e5e4494d
Tidied code

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 1:5a85b31f9142 11 //#include "Rohrflute.h" //This is the best sample
djbottrill 2:8b22402c0b0f 12 //#include "Dubbelflojt.h"
djbottrill 2:8b22402c0b0f 13 //#include "Principal.h"
djbottrill 2:8b22402c0b0f 14 #include "Bourdon.h"
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 0:4d06e0867376 109 Sound Generation is is in 4 states sored 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 0:4d06e0867376 112 2 = Signal to start decay this may be delayed until the sound is paaased the initial attack
djbottrill 0:4d06e0867376 113 3 = Sample is in the decay phase.
djbottrill 0:4d06e0867376 114
djbottrill 0:4d06e0867376 115 This routine also handles the Synchronous output to a 96 bit shift register Organ Pallet mangnet 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 Additional code to de-bounce the K64F onboard switches again using multiple ticks to de-bounce; has 4 states:
djbottrill 0:4d06e0867376 120 0 - Button not pressed
djbottrill 0:4d06e0867376 121 1 - Button pressed waiting for de-bounce count of 100 ticks (4.53 mS)
djbottrill 0:4d06e0867376 122 2 - Button press stable, this staus can be read as the de-bounced status indicating the button press is clean
djbottrill 4:9f63e68b548e 123 3 - Button released waiting for de-bounce count of 100 ticks before setting status back to 0
djbottrill 0:4d06e0867376 124 */
djbottrill 0:4d06e0867376 125 void aout()
djbottrill 0:4d06e0867376 126 {
djbottrill 4:9f63e68b548e 127 diag=1; //Pulse DIAG Pin for Scoping purposes IE pin high
djbottrill 0:4d06e0867376 128 redled=0; //Pulse Red LED to indicate Ticker working
djbottrill 0:4d06e0867376 129 audio_out=0; //Clear Audio Accumulator
djbottrill 0:4d06e0867376 130
djbottrill 0:4d06e0867376 131 SER1=keybuf[outidx+12]; //Send bit serially
djbottrill 0:4d06e0867376 132
djbottrill 0:4d06e0867376 133 for (i =0; i<16; i++) { //Do 16 channels
djbottrill 4:9f63e68b548e 134 switch (synthstat[i]) {
djbottrill 4:9f63e68b548e 135 case 1: //Sustain phase
djbottrill 4:9f63e68b548e 136 if (synth[i]>sample_loop_end[synthoctave[i]]) { //Got to end of buffer?
djbottrill 4:9f63e68b548e 137 synth[i]=sample_loop_start[synthoctave[i]]; //Wrap around back to start
djbottrill 4:9f63e68b548e 138 }
djbottrill 4:9f63e68b548e 139 break;
djbottrill 4:9f63e68b548e 140 case 2: //Note off demand state
djbottrill 0:4d06e0867376 141 if (synth[i]>=sample_attack[synthoctave[i]]) { //Delay decay phase if not past end of attack
djbottrill 0:4d06e0867376 142 //Check if the waveform is close to zero crossing this helps eliminate clicks looks for rising edge approaching 0x80
djbottrill 0:4d06e0867376 143 tempidx=synth[i];
djbottrill 4:9f63e68b548e 144 if (sample[synthoctave[i]][tempidx]<128 & sample[synthoctave[i]][tempidx]>120) {
djbottrill 0:4d06e0867376 145 if (sample[synthoctave[i]][tempidx]>synth_old[i]) {
djbottrill 0:4d06e0867376 146 synth[i]=sample_loop_off[synthoctave[i]]; //Jump to start of decay
djbottrill 0:4d06e0867376 147 synthstat[i]=3; //Say note in decay
djbottrill 0:4d06e0867376 148 }
djbottrill 0:4d06e0867376 149 }
djbottrill 0:4d06e0867376 150 }
djbottrill 4:9f63e68b548e 151 break;
djbottrill 0:4d06e0867376 152 }
djbottrill 4:9f63e68b548e 153
djbottrill 4:9f63e68b548e 154 //get sample and add to Audio Accumulator
djbottrill 0:4d06e0867376 155 tempidx=synth[i]; //Convert to integer
djbottrill 0:4d06e0867376 156 synth_old[i]=sample[synthoctave[i]][tempidx]; //Get and save old sample
djbottrill 0:4d06e0867376 157 audio_out=audio_out+synth_old[i]; //add sample to audio out accumulator
djbottrill 0:4d06e0867376 158 synth[i]=synth[i]+synthidx[i]; //Get next sample pointer
djbottrill 0:4d06e0867376 159
djbottrill 0:4d06e0867376 160 //Check if decay has completed
djbottrill 0:4d06e0867376 161 if (synth[i]>=sample_len[synthoctave[i]]) { //End of decay?
djbottrill 0:4d06e0867376 162 synthstat[i]=0; //say channel free
djbottrill 0:4d06e0867376 163 synth[i]=0; //Set sample pointer to 0
djbottrill 0:4d06e0867376 164 synthidx[i]=0; //Set sample index to 0
djbottrill 0:4d06e0867376 165 synthtab[i]=255; //Set to invalid
djbottrill 0:4d06e0867376 166 }
djbottrill 0:4d06e0867376 167
djbottrill 0:4d06e0867376 168 //Generate clock pulses to send data serially
djbottrill 4:9f63e68b548e 169 switch (i) {
djbottrill 4:9f63e68b548e 170 case 2:
djbottrill 4:9f63e68b548e 171 SRCK=1; //Generate serial output clock pulse
djbottrill 4:9f63e68b548e 172 break;
djbottrill 4:9f63e68b548e 173 case 5:
djbottrill 4:9f63e68b548e 174 SRCK=0;
djbottrill 4:9f63e68b548e 175 break;
djbottrill 4:9f63e68b548e 176 case 10:
djbottrill 4:9f63e68b548e 177 if (outidx==0) {
djbottrill 4:9f63e68b548e 178 RCK=1; //Generate latch strobe after 96 bits sent
djbottrill 4:9f63e68b548e 179 }
djbottrill 4:9f63e68b548e 180 break;
djbottrill 4:9f63e68b548e 181 case 15:
djbottrill 4:9f63e68b548e 182 if (outidx==0) {
djbottrill 4:9f63e68b548e 183 RCK=0; //Generate latch strobe after 96 bits sent
djbottrill 4:9f63e68b548e 184 outidx=96;
djbottrill 4:9f63e68b548e 185 }
djbottrill 4:9f63e68b548e 186 break;
djbottrill 0:4d06e0867376 187 }
djbottrill 4:9f63e68b548e 188
djbottrill 0:4d06e0867376 189 } //Next Note
djbottrill 0:4d06e0867376 190 outidx--; //Next serial data bit
djbottrill 0:4d06e0867376 191
djbottrill 0:4d06e0867376 192 //Output to DAC
djbottrill 0:4d06e0867376 193 Aout.write_u16(audio_out*16);
djbottrill 0:4d06e0867376 194
djbottrill 0:4d06e0867376 195 // De-bounce SW1
djbottrill 0:4d06e0867376 196 if (sw1_phase==0 & sw1==0) { //Button just been pressed
djbottrill 0:4d06e0867376 197 sw1_phase=1;
djbottrill 0:4d06e0867376 198 sw1_count=100;
djbottrill 0:4d06e0867376 199 }
djbottrill 0:4d06e0867376 200 if (sw1_phase==1 & sw1_count==0 & sw1==0) { //Button still pressed after de-bounce period
djbottrill 0:4d06e0867376 201 sw1_phase=2;
djbottrill 0:4d06e0867376 202 }
djbottrill 0:4d06e0867376 203 if (sw1_phase==1 & sw1_count==0 & sw1==1) { //Button no longer pressed after de-bounce period
djbottrill 0:4d06e0867376 204 sw1_phase=0;
djbottrill 0:4d06e0867376 205 }
djbottrill 0:4d06e0867376 206 if (sw1_phase==2 & sw1==1) { //Button released
djbottrill 0:4d06e0867376 207 sw1_phase=3;
djbottrill 0:4d06e0867376 208 sw1_count=100;
djbottrill 0:4d06e0867376 209 }
djbottrill 0:4d06e0867376 210 if (sw1_phase==3 & sw1_count==0 & sw1==1) { //Button still released after timeout
djbottrill 0:4d06e0867376 211 sw1_phase=0;
djbottrill 0:4d06e0867376 212 }
djbottrill 0:4d06e0867376 213 sw1_count--;
djbottrill 0:4d06e0867376 214
djbottrill 0:4d06e0867376 215 // De-bounce SW3
djbottrill 0:4d06e0867376 216 if (sw3_phase==0 & sw3==0) { //Button just been pressed
djbottrill 0:4d06e0867376 217 sw3_phase=1;
djbottrill 0:4d06e0867376 218 sw3_count=100;
djbottrill 0:4d06e0867376 219 }
djbottrill 0:4d06e0867376 220 if (sw3_phase==1 & sw3_count==0 & sw3==0) { //Button still pressed after de-bounce period
djbottrill 0:4d06e0867376 221 sw3_phase=2;
djbottrill 0:4d06e0867376 222 }
djbottrill 0:4d06e0867376 223 if (sw3_phase==1 & sw3_count==0 & sw3==1) { //Button no longer pressed after de-bounce period
djbottrill 0:4d06e0867376 224 sw3_phase=0;
djbottrill 0:4d06e0867376 225 }
djbottrill 0:4d06e0867376 226 if (sw3_phase==2 & sw3==1) { //Button released
djbottrill 0:4d06e0867376 227 sw3_phase=3;
djbottrill 0:4d06e0867376 228 sw3_count=100;
djbottrill 0:4d06e0867376 229 }
djbottrill 0:4d06e0867376 230 if (sw3_phase==3 & sw3_count==0 & sw3==1) { //Button still released after timeout
djbottrill 0:4d06e0867376 231 sw3_phase=0;
djbottrill 0:4d06e0867376 232 }
djbottrill 0:4d06e0867376 233 sw3_count--;
djbottrill 0:4d06e0867376 234
djbottrill 0:4d06e0867376 235 redled=1;
djbottrill 0:4d06e0867376 236 diag=0;
djbottrill 0:4d06e0867376 237 }
djbottrill 0:4d06e0867376 238
djbottrill 0:4d06e0867376 239 /*
djbottrill 0:4d06e0867376 240 Interrupt routine to receive MIDI on/off message and set LED status accordingly
djbottrill 0:4d06e0867376 241 MIDI note on/off events directly start/stop the synth channels and store the note status in keytab.
djbottrill 0:4d06e0867376 242 */
djbottrill 0:4d06e0867376 243 void get_message(MIDIMessage msg)
djbottrill 0:4d06e0867376 244 {
djbottrill 0:4d06e0867376 245 greenled=0; //Pulse Green LED to indicate MIDI activity
djbottrill 0:4d06e0867376 246 key=msg.key();
djbottrill 0:4d06e0867376 247 velocity=msg.velocity();
djbottrill 0:4d06e0867376 248 chan=msg.channel();
djbottrill 0:4d06e0867376 249
djbottrill 0:4d06e0867376 250 switch (msg.type()) {
djbottrill 0:4d06e0867376 251 case MIDIMessage::NoteOnType: //MIDI note on received
djbottrill 0:4d06e0867376 252 if (key>23) {
djbottrill 0:4d06e0867376 253 onoff=1;
djbottrill 0:4d06e0867376 254 keybuf[(key-24)]=1; //Store in keybuf, except for notes 24-35
djbottrill 0:4d06e0867376 255 //Process keys on
djbottrill 0:4d06e0867376 256 //Find a free note generator and start the note playing, if no slots available just ignore the note
djbottrill 0:4d06e0867376 257 for (ii=0; ii<16; ii++) {
djbottrill 0:4d06e0867376 258 if (synthtab[ii]!=(key-24) && synthstat[ii]==0) { //Is synth already playing the note?
djbottrill 0:4d06e0867376 259 synthtab[ii]=key-24; //Store note value
djbottrill 0:4d06e0867376 260 synthoctave[ii]=synthtab[ii]/12; //Store the octave
djbottrill 4:9f63e68b548e 261 synthnote[ii]= synthtab[ii]%12; //Note within the octave
djbottrill 0:4d06e0867376 262 synthstat[ii]=1; //Set status to playing
djbottrill 0:4d06e0867376 263 synthidx[ii]=freqtab[synthnote[ii]]; //Set the frequency
djbottrill 0:4d06e0867376 264 ii=16; //exit loop
djbottrill 0:4d06e0867376 265 } //Next Synth slot
djbottrill 0:4d06e0867376 266 }
djbottrill 0:4d06e0867376 267 }
djbottrill 0:4d06e0867376 268 break;
djbottrill 0:4d06e0867376 269
djbottrill 0:4d06e0867376 270 //Process keys off
djbottrill 0:4d06e0867376 271 case MIDIMessage::NoteOffType: //Midi note off received
djbottrill 0:4d06e0867376 272 if (key>23) {
djbottrill 0:4d06e0867376 273 onoff=0;
djbottrill 0:4d06e0867376 274 keybuf[(key-24)]=0; //Update keybuf
djbottrill 0:4d06e0867376 275 for (ii=0; ii<16; ii++) {
djbottrill 0:4d06e0867376 276 if (synthstat[ii]==1 && synthtab[ii]==(key-24)) { //Note currently playing
djbottrill 0:4d06e0867376 277 synthstat[ii]=2; //Set Start decay
djbottrill 0:4d06e0867376 278 ii=16;
djbottrill 0:4d06e0867376 279 }
djbottrill 0:4d06e0867376 280 }
djbottrill 0:4d06e0867376 281 }
djbottrill 0:4d06e0867376 282 break;
djbottrill 0:4d06e0867376 283
djbottrill 0:4d06e0867376 284 //Process all notes off command
djbottrill 0:4d06e0867376 285 case MIDIMessage::AllNotesOffType: //Midi all notes off
djbottrill 0:4d06e0867376 286 for (ii=0; ii<108; i++) {
djbottrill 0:4d06e0867376 287 keybuf[ii]=0; //Clear Keybuf
djbottrill 0:4d06e0867376 288 }
djbottrill 0:4d06e0867376 289 for (ii=0; ii>16; ii++) { //Kill any sampled notes playing
djbottrill 0:4d06e0867376 290 synthstat[ii]=0; //say channel free
djbottrill 0:4d06e0867376 291 synth[ii]=0; //Set sample pointer to 0
djbottrill 0:4d06e0867376 292 synthidx[ii]=0; //Set sample index to 0
djbottrill 0:4d06e0867376 293 synthtab[ii]=255; //Set to invalid
djbottrill 0:4d06e0867376 294 }
djbottrill 0:4d06e0867376 295 break;
djbottrill 4:9f63e68b548e 296
djbottrill 0:4d06e0867376 297 //Any other MIDI Commands just ignore
djbottrill 0:4d06e0867376 298 default:
djbottrill 0:4d06e0867376 299 break;
djbottrill 0:4d06e0867376 300 }
djbottrill 0:4d06e0867376 301 greenled=1;
djbottrill 0:4d06e0867376 302 }
djbottrill 0:4d06e0867376 303
djbottrill 0:4d06e0867376 304
djbottrill 0:4d06e0867376 305 int main()
djbottrill 0:4d06e0867376 306 {
djbottrill 0:4d06e0867376 307 greenled=1;
djbottrill 0:4d06e0867376 308 redled=1;
djbottrill 0:4d06e0867376 309 blueled=1;
djbottrill 0:4d06e0867376 310 SRCK=0; //Serial Clock low
djbottrill 0:4d06e0867376 311 RCK=0; //Latch Clock low
djbottrill 0:4d06e0867376 312
djbottrill 0:4d06e0867376 313 sw1.mode(PullUp);
djbottrill 0:4d06e0867376 314 sw3.mode(PullUp);
djbottrill 0:4d06e0867376 315
djbottrill 0:4d06e0867376 316 output_ticker.attach(&aout, sample_rate); //Set Sample frequency
djbottrill 0:4d06e0867376 317
djbottrill 0:4d06e0867376 318 lcd.cls();
djbottrill 0:4d06e0867376 319 wait(0.1);
djbottrill 0:4d06e0867376 320 lcd.setCursor(TextLCD::CurOff_BlkOff);
djbottrill 0:4d06e0867376 321 lcd.cls();
djbottrill 0:4d06e0867376 322 lcd.printf("MIDI Pipe Organ Waiting for USB");
djbottrill 0:4d06e0867376 323
djbottrill 0:4d06e0867376 324 NVIC_SetPriority(USB0_IRQn, 99); //Reduce Interrupt priority of USB
djbottrill 0:4d06e0867376 325
djbottrill 0:4d06e0867376 326 USBMIDI midi; //Start up MIDI
djbottrill 0:4d06e0867376 327 midi.attach(get_message); //callback for MIDI messages received
djbottrill 0:4d06e0867376 328
djbottrill 0:4d06e0867376 329 lcd.cls();
djbottrill 0:4d06e0867376 330 lcd.printf("MIDI Pipe Organ");
djbottrill 0:4d06e0867376 331 wait(1);
djbottrill 0:4d06e0867376 332 lcd.cls();
djbottrill 0:4d06e0867376 333 lcd.printf("On Chan Note Vel");
djbottrill 0:4d06e0867376 334 //Program user defined characters into OLED display for bar graph
djbottrill 0:4d06e0867376 335 lcd.setUDC(0, (char *) udc0);
djbottrill 0:4d06e0867376 336 lcd.setUDC(1, (char *) udc1);
djbottrill 0:4d06e0867376 337 lcd.setUDC(2, (char *) udc2);
djbottrill 0:4d06e0867376 338 lcd.setUDC(3, (char *) udc3);
djbottrill 0:4d06e0867376 339 lcd.setUDC(4, (char *) udc4);
djbottrill 0:4d06e0867376 340 lcd.setUDC(5, (char *) udc5);
djbottrill 0:4d06e0867376 341 lcd.setUDC(6, (char *) udc6);
djbottrill 0:4d06e0867376 342 lcd.setUDC(7, (char *) udc7);
djbottrill 0:4d06e0867376 343
djbottrill 0:4d06e0867376 344 key=0;
djbottrill 0:4d06e0867376 345 velocity=0;
djbottrill 0:4d06e0867376 346 chan=0;
djbottrill 0:4d06e0867376 347 onoff=0;
djbottrill 0:4d06e0867376 348
djbottrill 0:4d06e0867376 349 //Main Loop
djbottrill 0:4d06e0867376 350 while(1) {
djbottrill 0:4d06e0867376 351
djbottrill 0:4d06e0867376 352 if (sw1_phase==2 | sw3_phase==2) {
djbottrill 0:4d06e0867376 353 blueled=0;
djbottrill 0:4d06e0867376 354 } else {
djbottrill 0:4d06e0867376 355 blueled=1;
djbottrill 0:4d06e0867376 356 }
djbottrill 0:4d06e0867376 357
djbottrill 0:4d06e0867376 358
djbottrill 0:4d06e0867376 359 //Check for display mode button being presed
djbottrill 0:4d06e0867376 360 if (sw3_phase != sw3_old) { //Mode Switch pressed
djbottrill 0:4d06e0867376 361 if(sw3_phase==2) {
djbottrill 0:4d06e0867376 362 lcdmode++;
djbottrill 0:4d06e0867376 363 if (lcdmode>2) {
djbottrill 0:4d06e0867376 364 lcdmode=0;
djbottrill 0:4d06e0867376 365 }
djbottrill 0:4d06e0867376 366 lcd.cls();
djbottrill 0:4d06e0867376 367 if (lcdmode==0) {
djbottrill 0:4d06e0867376 368 lcd.printf("On Chan Note Vel");
djbottrill 0:4d06e0867376 369 }
djbottrill 0:4d06e0867376 370 if (lcdmode==1) {
djbottrill 0:4d06e0867376 371 //Initialise bar graph display
djbottrill 0:4d06e0867376 372
djbottrill 0:4d06e0867376 373 for (row=0; row<2; row++) {
djbottrill 0:4d06e0867376 374 for (pos=0; pos<16; pos++) {
djbottrill 0:4d06e0867376 375 display[row][pos]=0;
djbottrill 0:4d06e0867376 376 display_old[row][pos]=1;
djbottrill 0:4d06e0867376 377 }
djbottrill 0:4d06e0867376 378 }
djbottrill 0:4d06e0867376 379 }
djbottrill 0:4d06e0867376 380 if (lcdmode==2) {
djbottrill 0:4d06e0867376 381 lcd.locate(0,1);
djbottrill 0:4d06e0867376 382 lcd.printf("0123456789ABCDEF");
djbottrill 0:4d06e0867376 383 }
djbottrill 0:4d06e0867376 384 }
djbottrill 0:4d06e0867376 385 }
djbottrill 0:4d06e0867376 386 sw3_old=sw3_phase;
djbottrill 0:4d06e0867376 387
djbottrill 0:4d06e0867376 388
djbottrill 0:4d06e0867376 389
djbottrill 0:4d06e0867376 390 // OLED MIDI Status display
djbottrill 0:4d06e0867376 391 if (lcdmode==0) {
djbottrill 0:4d06e0867376 392 lcd_stat=key+(128*velocity)+(16384*chan)+(262144*onoff);
djbottrill 0:4d06e0867376 393 if (lcd_stat!=lcd_stat_old) {
djbottrill 0:4d06e0867376 394
djbottrill 0:4d06e0867376 395 lcd.locate(0,1);
djbottrill 0:4d06e0867376 396 lcd.printf("%1d %2d %3d %3d", onoff, chan, key, velocity);
djbottrill 0:4d06e0867376 397 lcd_stat_old=lcd_stat;
djbottrill 0:4d06e0867376 398 }
djbottrill 0:4d06e0867376 399 }
djbottrill 0:4d06e0867376 400
djbottrill 0:4d06e0867376 401 // OLED MIDI Bar Display
djbottrill 0:4d06e0867376 402 if (lcdmode==1) {
djbottrill 0:4d06e0867376 403 keyidx=0;
djbottrill 0:4d06e0867376 404 for (row=1; row>=0; row--) {
djbottrill 0:4d06e0867376 405 for (pos=0; pos<16; pos++) {
djbottrill 0:4d06e0867376 406 keyidx_t=keyidx*2;
djbottrill 0:4d06e0867376 407 if(keyidx_t>94) {
djbottrill 0:4d06e0867376 408 keyidx_t=keyidx_t-95;
djbottrill 0:4d06e0867376 409 }
djbottrill 0:4d06e0867376 410 tval=keybuf[keyidx_t];
djbottrill 0:4d06e0867376 411 keyidx++;
djbottrill 0:4d06e0867376 412 keyidx_t=keyidx*2;
djbottrill 0:4d06e0867376 413 if(keyidx_t>94) {
djbottrill 0:4d06e0867376 414 keyidx_t=keyidx_t-95;
djbottrill 0:4d06e0867376 415 }
djbottrill 0:4d06e0867376 416 tval=tval+(2*keybuf[keyidx_t]);
djbottrill 0:4d06e0867376 417 keyidx++;
djbottrill 0:4d06e0867376 418
djbottrill 0:4d06e0867376 419 keyidx_t=keyidx*2;
djbottrill 0:4d06e0867376 420 if(keyidx_t>94) {
djbottrill 0:4d06e0867376 421 keyidx_t=keyidx_t-95;
djbottrill 0:4d06e0867376 422 }
djbottrill 0:4d06e0867376 423 tval=tval+(4*keybuf[keyidx_t]);
djbottrill 0:4d06e0867376 424 keyidx++;
djbottrill 0:4d06e0867376 425 display[row][pos]=tval;
djbottrill 0:4d06e0867376 426
djbottrill 0:4d06e0867376 427 if(display[row][pos]!=display_old[row][pos]) {
djbottrill 0:4d06e0867376 428 lcd.locate(pos,row);
djbottrill 0:4d06e0867376 429 lcd.putc(display[row][pos]);
djbottrill 0:4d06e0867376 430 display_old[row][pos]=display[row][pos];
djbottrill 0:4d06e0867376 431 }
djbottrill 0:4d06e0867376 432 }
djbottrill 0:4d06e0867376 433 }
djbottrill 0:4d06e0867376 434 }
djbottrill 0:4d06e0867376 435
djbottrill 0:4d06e0867376 436 //Display status of the Synth channels
djbottrill 0:4d06e0867376 437 if (lcdmode==2) {
djbottrill 0:4d06e0867376 438 lcd.locate(0,0);
djbottrill 0:4d06e0867376 439 for (noteidx=0; noteidx<16; noteidx++) {
djbottrill 0:4d06e0867376 440 lcd.putc((synthstat[noteidx]+48));
djbottrill 0:4d06e0867376 441 }
djbottrill 0:4d06e0867376 442 }
djbottrill 4:9f63e68b548e 443
djbottrill 0:4d06e0867376 444 } //End of main loop
djbottrill 0:4d06e0867376 445 } //End of program
djbottrill 0:4d06e0867376 446
djbottrill 0:4d06e0867376 447
djbottrill 0:4d06e0867376 448
djbottrill 0:4d06e0867376 449