David Bottrill
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
Diff: main.cpp
- Revision:
- 17:7f27f4921305
- Parent:
- 16:d2694fb530c3
- Child:
- 18:472954b6b711
--- a/main.cpp Thu Nov 12 21:54:14 2015 +0000
+++ b/main.cpp Thu Nov 12 22:48:31 2015 +0000
@@ -8,13 +8,13 @@
*/
#include "mbed.h"
-//#include "Rohrflute.h"
-//#include "Dubbelflojt.h"
-//#include "Principal.h"
-//#include "Bourdon.h"
-//#include "Bourdon_32.h"
-//#include "Bourdon_44.h" //This is the best sample 44.1Khz
-#include "Montre_44.h"
+#include "Bourdon_44.h" //This is the best sample 44.1Khz
+#include "Montre_44.h"
+const float sample1_rate = 0.00002268; //44.1KHz
+const float freqtab[] = {
+//For Organ Sample played at sample speed
+1, 1.0596, 1.1227, 1.1893, 1.2599, 1.3348, 1.4144, 1.4985, 1.5872, 1.6819, 1.782, 1.888, 2 };
+
#include "USBMIDI.h"
@@ -103,6 +103,7 @@
int oldstops=1;
//Sound generator variables
+int sampleset=0;
int tempidx=0;
int freqidx=45;
float synth[16];
@@ -137,42 +138,83 @@
// diag=1; //Pulse DIAG Pin for Scoping purposes IE pin high
// redled=0; //Pulse Red LED to indicate Ticker working
audio_out=0; //Clear Audio Accumulator
-
- for (i =0; i<16; i++) { //Do 16 channels
- switch (synthstat[i]) {
- case 1: //Sustain phase
- if (synth[i]>sample_loop_end[synthoctave[i]]) { //Got to end of buffer?
- synth[i]=sample_loop_start[synthoctave[i]]; //Wrap around back to start
- }
- break;
- case 2: //Note off demand state
- if (synth[i]>=sample_attack[synthoctave[i]]) { //Delay decay phase if not past end of attack
+ if (sampleset==0) {
+ for (i =0; i<16; i++) { //Do 16 channels
+ switch (synthstat[i]) {
+ case 1: //Sustain phase
+ if (synth[i]>sample1_loop_end[synthoctave[i]]) { //Got to end of buffer?
+ synth[i]=sample1_loop_start[synthoctave[i]]; //Wrap around back to start
+ }
+ break;
+ case 2: //Note off demand state
+ if (synth[i]>=sample1_attack[synthoctave[i]]) { //Delay decay phase if not past end of attack
//Check if the waveform is close to zero crossing this helps eliminate clicks looks for rising edge approaching 0x80
- tempidx=synth[i];
- if (sample[synthoctave[i]][tempidx]<128 & sample[synthoctave[i]][tempidx]>120) {
- if (sample[synthoctave[i]][tempidx]>synth_old[i]) {
- synth[i]=sample_loop_off[synthoctave[i]]; //Jump to start of decay
- synthstat[i]=3; //Say note in decay
+ tempidx=synth[i];
+ if (sample1[synthoctave[i]][tempidx]<128 & sample1[synthoctave[i]][tempidx]>120) {
+ if (sample1[synthoctave[i]][tempidx]>synth_old[i]) {
+ synth[i]=sample1_loop_off[synthoctave[i]]; //Jump to start of decay
+ synthstat[i]=3; //Say note in decay
+ }
}
}
- }
- break;
- case 3: //Check if decay has completed
- if (synth[i]>=sample_len[synthoctave[i]]) { //End of decay?
- synthstat[i]=0; //say channel free
- synth[i]=0; //Set sample pointer to 0
- synthidx[i]=0; //Set sample index to 0
- synthtab[i]=255; //Set to invalid
- }
- break ;
- }
+ break;
+ case 3: //Check if decay has completed
+ if (synth[i]>=sample1_len[synthoctave[i]]) { //End of decay?
+ synthstat[i]=0; //say channel free
+ synth[i]=0; //Set sample pointer to 0
+ synthidx[i]=0; //Set sample index to 0
+ synthtab[i]=255; //Set to invalid
+ }
+ break ;
+ }
//get sample and add to Audio Accumulator
- synth_old[i]=sample[synthoctave[i]][(int)(synth[i])]; //Get and save old sample
- audio_out=audio_out+synth_old[i]; //add sample to audio out accumulator
- synth[i]=synth[i]+synthidx[i]; //Get next sample pointer
+ synth_old[i]=sample1[synthoctave[i]][(int)(synth[i])]; //Get and save old sample
+ audio_out=audio_out+synth_old[i]; //add sample to audio out accumulator
+ synth[i]=synth[i]+synthidx[i]; //Get next sample pointer
+
+ } //Next Note
+ } else {
+
+//Sample Set 2
- } //Next Note
+ for (i =0; i<16; i++) { //Do 16 channels
+ switch (synthstat[i]) {
+ case 1: //Sustain phase
+ if (synth[i]>sample2_loop_end[synthoctave[i]]) { //Got to end of buffer?
+ synth[i]=sample2_loop_start[synthoctave[i]]; //Wrap around back to start
+ }
+ break;
+ case 2: //Note off demand state
+ if (synth[i]>=sample2_attack[synthoctave[i]]) { //Delay decay phase if not past end of attack
+//Check if the waveform is close to zero crossing this helps eliminate clicks looks for rising edge approaching 0x80
+ tempidx=synth[i];
+ if (sample2[synthoctave[i]][tempidx]<128 & sample2[synthoctave[i]][tempidx]>120) {
+ if (sample2[synthoctave[i]][tempidx]>synth_old[i]) {
+ synth[i]=sample1_loop_off[synthoctave[i]]; //Jump to start of decay
+ synthstat[i]=3; //Say note in decay
+ }
+ }
+ }
+ break;
+ case 3: //Check if decay has completed
+ if (synth[i]>=sample2_len[synthoctave[i]]) { //End of decay?
+ synthstat[i]=0; //say channel free
+ synth[i]=0; //Set sample pointer to 0
+ synthidx[i]=0; //Set sample index to 0
+ synthtab[i]=255; //Set to invalid
+ }
+ break ;
+ }
+
+//get sample and add to Audio Accumulator
+ synth_old[i]=sample2[synthoctave[i]][(int)(synth[i])]; //Get and save old sample
+ audio_out=audio_out+synth_old[i]; //add sample to audio out accumulator
+ synth[i]=synth[i]+synthidx[i]; //Get next sample pointer
+
+ } //Next Note
+ }
+
//Output to DAC
Aout.write_u16(audio_out*16);
@@ -257,7 +299,7 @@
p4.mode(PullUp);
p5.mode(PullUp);
- output_ticker.attach(&aout, sample_rate); //Set Sample frequency
+ output_ticker.attach(&aout, sample1_rate); //Set Sample frequency
lcd.cls();
wait(0.1);
@@ -395,9 +437,6 @@
}
sw3_count--;
-
-
-
if (sw1_phase==2 | sw3_phase==2) {
blueled=0;
} else {
@@ -405,17 +444,23 @@
}
-//Button 1 will clear all playing notes
+//Button 1 will clear all playing notes & switch sampleset
if (sw1_phase != sw1_old) {
if(sw1_phase==2) {
for (cl=0; cl<108; cl++) {
- keybuf[cl]=0; //Clear Keybuf
+ keybuf[cl]=0; //Clear Keybuf
+ }
+ sampleset++;
+ oldstops=255; //Force a display refresh
+ if (sampleset>1) {
+ sampleset=0;
}
}
}
-
+ sw1_old=sw1_phase;
+
//Check for display mode button being presed
- if (sw3_phase != sw3_old) { //Mode Switch pressed
+ if (sw3_phase != sw3_old) { //Mode Switch pressed
if(sw3_phase==2) {
lcdmode++;
if (lcdmode>4) {
@@ -560,13 +605,16 @@
pos=stops[0] + stops[1]+stops[2]+stops[3]+stops[4];
if (oldstops != pos) {
- oldstops=pos;
+ oldstops=pos;
lcd.cls();
for (pos=0; pos<16; pos++) {
lcd.locate(pos,0);
- lcd.putc(stopname[pos]);
+ if (sampleset==0) {
+ lcd.putc(stopname1[pos]);
+ } else {
+ lcd.putc(stopname2[pos]);
+ }
}
-
lcd.locate(0,1);
if (stops[0]==0) {
lcd.printf("16 ");