Radio Junk Box
KAMUI MIDI-CV Example
Diff: main.cpp
- Revision:
- 0:25a282f1141a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat May 05 11:35:41 2012 +0000
@@ -0,0 +1,512 @@
+//-------------------------------------------------------------
+// KAMUI MIDI-CV Exapmple
+// Copyright (C) 2012 RJB RadioJunkBox
+// Released under the MIT License: http://mbed.org/license/mit
+//-------------------------------------------------------------
+
+#include "mbed.h"
+#include "TextLCD.h"
+#include <stdlib.h>
+#include <math.h>
+
+//-------------------------------------------------------------
+// Define
+
+#define AD5551 // 14bitDAC
+
+#define SPI_RATE 1000000 // 1Mbps
+#define MIDI_RATE 31250 // 31.25kbps
+#define BEEP_FREQ 1760.0 // 1760Hz
+#define UPDATE_INTERVAL 100 // 100us
+#define SW_WATCH_INTERVAL (25000/UPDATE_INTERVAL) // 25ms
+#define PARAM_GLIDE 6554.0
+#define PARAM_DP 6912.0 // UPDATE_INTERVAL = 100us
+//#define PARAM_DP 8192.0 // UPDATE_INTERVAL = 50us
+
+#define UPDATE_MODE0 0 // Update Interval CV ch1-6 1200us, ch7,8 400us
+#define UPDATE_MODE1 1 // Update Interval CV ch1-6 N/A, ch7,8 200us
+
+#define GATE1 0x01
+#define GATE2 0x02
+#define GATE3 0x04
+#define GATE4 0x08
+
+#define SYNC1CLK 0x01
+#define SYNC1RUN 0x02
+#define SYNC2CLK 0x04
+#define SYNC2RUN 0x08
+
+#define MODE_CV 0x00
+#define MODE_GATE 0x40
+#define MODE_SYNC 0x80
+#define MODE_SET_SYNC 0xC0
+
+#define SW1 0x01
+#define SW2 0x02
+#define SW3 0x04
+#define SW4 0x08
+#define SYNC1CLK_IN 0x10
+#define SYNC1RUN_IN 0x20
+#define SYNC2CLK_IN 0x40
+#define GATE_IN 0x80
+
+#define _ENABLE 0
+#define _DISABLE 1
+
+#define BUFSIZE 32 // size of ring buffer (ex 4,8,16,32...)
+#define LFO_WF_TRI 0
+#define LFO_WF_SQR 1
+#define LFO_WF_SAW 2
+#define LFO_WF_NONE 3
+#define MINIMUMNOTE 12
+#define SYNC_TURN_TIME (5000/UPDATE_INTERVAL) // 5ms
+
+//-------------------------------------------------------------
+// Functions
+
+void InitKamui(void);
+void UpdateCV(void);
+unsigned char CheckSW(unsigned char);
+
+void RcvMIDI(void);
+void MidiCV(void);
+void CalcHzVTbl(void);
+unsigned short OctVtoHzV(unsigned short);
+void DinSync(void);
+extern void MIDI_Parser(unsigned char);
+
+//-------------------------------------------------------------
+// Global Variables
+
+int gUpdateMode;
+unsigned short gCV[8];
+unsigned char gGATE;
+unsigned char gSYNC;
+unsigned char gSW;
+
+union {
+ unsigned short WORD;
+ struct {
+ unsigned char L;
+ unsigned char H;
+ } BYTE;
+} gDAC;
+
+int gPtr_buf_in, gPtr_buf_out;
+unsigned char gRxBuf[BUFSIZE];
+
+float gGLIDE[4];
+unsigned short gLFO_DP[4];
+unsigned char gLFO_FORM[4];
+unsigned char gMIDI_CH[4];
+short gTblHzV[3072];
+
+extern unsigned char gPlayNoteBuf[];
+extern unsigned char gGateBuf[];
+extern unsigned char gPitchBendBuf[];
+extern unsigned char gModWheelBuf[];
+extern unsigned char gMIDISYNC_CLK;
+extern unsigned char gMIDISYNC_RUN;
+
+//-------------------------------------------------------------
+// mbed Functions
+
+// TextLCD
+TextLCD gLCD(p23, p24, p25, p26, p29, p30); // rs, e, d4-d7
+
+// SPI
+SPI gSPI(p11,p12,p13);
+DigitalOut gCSA(p14);
+DigitalOut gCSB(p22);
+
+// Sirial MIDI
+Serial gMIDI(p9,p10);
+
+// AnalogIn
+AnalogIn gAIN1(p15); // VR1
+AnalogIn gAIN2(p16); // VR2
+AnalogIn gAIN3(p17); // VR3
+AnalogIn gAIN4(p18); // VR4
+AnalogIn gAIN5(p19); // IN1
+AnalogIn gAIN6(p20); // IN2
+
+// BEEP
+PwmOut gBEEP(p21);
+
+// LED
+DigitalOut gLED1(LED1);
+DigitalOut gLED2(LED2);
+DigitalOut gLED3(LED3);
+DigitalOut gLED4(LED4);
+BusOut gLEDS(LED1,LED2,LED3,LED4);
+
+// Ticker
+Ticker gTICKER;
+
+//-------------------------------------------------------------
+// main
+
+int main() {
+
+ int i;
+ int pot[4],_pot[4];
+ unsigned char rb;
+ unsigned char ch = 0;
+ unsigned char mode = 7; // for Intialize
+ unsigned char edit[4];
+ int val[2][4] = { 0, 0, 0, 0, 50, 50, 50, 50 };
+ char *wave[4] = { "TR","SQ","SW","--" };
+
+ // Initialize
+ gPtr_buf_in = gPtr_buf_out = 0;
+ for( i=0; i<4; i++) {
+ pot[i] = _pot[i] = 0;
+ edit[i] = 0;
+ gGLIDE[i] = 1.0 / expf(val[0][i]*656.0/PARAM_GLIDE);
+ gLFO_DP[i] = expf(val[1][i]*656.0/PARAM_DP);
+ gLFO_FORM[i] = LFO_WF_TRI;
+ gMIDI_CH[i] = i;
+ }
+
+ for( i=0; i<16; i++) { // MIDI Data Buffers
+ gPlayNoteBuf[i] =24;
+ gGateBuf[i] = 0;
+ gPitchBendBuf[i] = 0x40;
+ gModWheelBuf[i] = 0;
+ }
+
+ gSW = 1; // for Intialize
+
+ CalcHzVTbl();
+ InitKamui();
+
+ // loop
+ while(1) {
+
+ // ring buffer empty?
+ if(gPtr_buf_in != gPtr_buf_out) {
+
+ // get 1byte from ring buffer
+ gPtr_buf_out++;
+ gPtr_buf_out &= (BUFSIZE - 1);
+ rb = gRxBuf[gPtr_buf_out];
+ MIDI_Parser(rb);
+ continue;
+ }
+
+ // Read pot
+ pot[0] = gAIN1.read_u16();
+ pot[1] = gAIN2.read_u16();
+ pot[2] = gAIN3.read_u16();
+ pot[3] = gAIN4.read_u16();
+
+ // change pot amount?
+ if(abs(pot[ch] - _pot[ch]) > 0x2000) edit[ch] = 1;
+
+ if(edit[ch]) {
+ switch(mode) {
+ case 0:
+ gGLIDE[ch] = 1.0 / expf(pot[ch]/PARAM_GLIDE);
+ val[0][ch] = pot[ch] / 656;
+ break;
+ case 1:
+ gLFO_DP[ch] = expf(pot[ch]/PARAM_DP);
+ val[1][ch] = pot[ch] / 656;
+ break;
+ case 2:
+ gLFO_FORM[ch] = pot[ch] / 0x4000;
+ break;
+ case 3:
+ gMIDI_CH[ch] = pot[ch] / 0x1000;
+ break;
+ default:
+ break;
+ }
+ }
+
+ // Push Mode SW
+ if(gSW & SW1) {
+ mode++;
+ mode &= 0x03;
+ for( i=0; i<4; i++) {
+ _pot[i] = pot[i];
+ edit[i] = 0;
+ }
+ }
+ gSW = 0;
+
+ // LCD Display
+ gLCD.locate( 0, 1 );
+ switch(mode) {
+ case 0:
+ gLCD.printf("GLID %02d %02d %02d %02d",
+ val[0][0], val[0][1], val[0][2], val[0][3]);
+ break;
+ case 1:
+ gLCD.printf("FREQ %02d %02d %02d %02d",
+ val[1][0], val[1][1], val[1][2], val[1][3]);
+ break;
+ case 2:
+ gLCD.printf("FORM %s %s %s %s",
+ wave[gLFO_FORM[0]], wave[gLFO_FORM[1]],
+ wave[gLFO_FORM[2]], wave[gLFO_FORM[3]]);
+ break;
+ case 3:
+ gLCD.printf("MIDI %02d %02d %02d %02d",
+ gMIDI_CH[0]+1, gMIDI_CH[1]+1,
+ gMIDI_CH[2]+1, gMIDI_CH[3]+1);
+ break;
+ }
+
+ ch++;
+ ch &= 0x03;
+ }
+}
+
+//-------------------------------------------------------------
+// Initialize KAMUI
+
+void InitKamui()
+{
+ // Init. Variables
+ for( int i=0; i<8; i++) {
+ gCV[i] = 0x8000;
+ }
+ gGATE = 0;
+ gSYNC = 0;
+
+ gUpdateMode = UPDATE_MODE0;
+
+ // Init. SPI
+ gCSA = _DISABLE;
+ gCSB = _DISABLE;
+ gSPI.format(8,0);
+ gSPI.frequency(SPI_RATE);
+
+ // Init. Serial MIDI
+ gMIDI.baud(MIDI_RATE);
+
+ // Ticker
+ gTICKER.attach_us(&UpdateCV, UPDATE_INTERVAL);
+
+ // Beep
+ gBEEP.period(1.0/BEEP_FREQ);
+ gBEEP.write(0.5);
+ wait(0.2);
+ gBEEP.write(0.0);
+
+ // Init Display
+ gLCD.locate( 0, 0 );
+ // 123456789ABCDEF
+ gLCD.printf("MIDI-CV Example");
+}
+
+//-------------------------------------------------------------
+// Update CV, GATE, SYNC
+
+void UpdateCV()
+{
+ unsigned char rcv,ch;
+ unsigned char ptn[] = { 0,1,6,7,2,3,6,7,4,5,6,7 };
+ const int numptn = (sizeof ptn / sizeof ptn[0]) - 1;
+ static unsigned char cnt;
+
+ // SET DAC
+ ch = ptn[cnt];
+ if(gUpdateMode) ch |= 0x06;
+
+#ifdef AD5551 // 14bitDAC
+ gDAC.WORD = gCV[ch] >> 2;
+#else
+ gDAC.WORD = gCV[ch];
+#endif
+
+ gCSA = _ENABLE;
+ gSPI.write(gDAC.BYTE.H);
+ gSPI.write(gDAC.BYTE.L);
+ gCSA = _DISABLE;
+
+ // GATE or SYNC OUT
+ if(cnt & 0x01) {
+ // GATE OUT
+ gCSB = _ENABLE;
+ rcv = gSPI.write(gGATE | MODE_GATE) & 0x0F;
+ gCSB = _DISABLE;
+ }
+ else {
+ // SYNC OUT
+ gCSB = _ENABLE;
+ rcv = gSPI.write(gSYNC | MODE_SYNC);
+ gCSB = _DISABLE;
+ }
+
+ // SEL CV CHANNEL
+ gCSB = _ENABLE;
+ gSPI.write(ch);
+ gCSB = _DISABLE;
+
+ cnt < numptn ? cnt++ : cnt = 0;
+
+ gSW |= CheckSW(rcv);
+ RcvMIDI();
+ DinSync();
+ MidiCV();
+}
+
+//-------------------------------------------------------------
+// Check SW
+
+unsigned char CheckSW(unsigned char c) {
+
+ static unsigned char swbuf[2];
+ static unsigned int cntsw;
+ unsigned char ret = 0;
+
+ if(cntsw > SW_WATCH_INTERVAL) {
+ if(c &= 0x0F) {
+ if(!swbuf[1]) {
+ if( swbuf[0] == c) {
+ swbuf[1] = c;
+ ret = c;
+ }
+ else {
+ swbuf[0] = c;
+ }
+ }
+ }
+ else {
+ swbuf[1] = 0;
+ swbuf[0] = 0;
+ }
+ cntsw = 0;
+ }
+ cntsw++;
+ return ret;
+}
+
+//-------------------------------------------------------------
+// Receive MIDI Data & Store Ring Buffer
+
+void RcvMIDI() {
+
+ if(!gMIDI.readable()) return;
+
+ gPtr_buf_in++;
+ gPtr_buf_in &= (BUFSIZE - 1);
+ gRxBuf[gPtr_buf_in] = gMIDI.getc();
+}
+
+//-------------------------------------------------------------
+// MIDI Data to CV, GATE
+
+void MidiCV()
+{
+ static unsigned char ch;
+ static unsigned short phase[4];
+ static float cvf[4];
+ int lfo,mod;
+ unsigned char midi_ch;
+ unsigned int cv;
+ unsigned int note;
+
+ midi_ch = gMIDI_CH[ch];
+
+ note = gPlayNoteBuf[midi_ch];
+ if( note < MINIMUMNOTE) note = MINIMUMNOTE;
+ note -= MINIMUMNOTE;
+
+ // DDS Phase
+ phase[ch] += gLFO_DP[ch];
+
+ // LFO DDS Genelator
+ switch(gLFO_FORM[ch]) {
+ case LFO_WF_TRI:
+ if(phase[ch] < 32738) lfo = phase[ch] - 16384;
+ else lfo = (16383 + 32768) - phase[ch];
+ break;
+ case LFO_WF_SQR:
+ if(phase[ch] < 32738) lfo = 32767;
+ else lfo = 0;
+ break;
+ case LFO_WF_SAW:
+ lfo = phase[ch] / 2 - 16384;
+ break;
+ default :
+ lfo = 0;
+ break;
+ }
+
+ // Modulation amount
+ mod = lfo * gModWheelBuf[midi_ch] >> 7;
+
+ // Calculate CV
+ cvf[ch] = ((float)(note << 8) - cvf[ch]) * gGLIDE[ch] + cvf[ch];
+ cv = (unsigned int)cvf[ch] + (0x8000 - (0x0040 << 3))
+ + (gPitchBendBuf[midi_ch] << 2) + mod;
+ if(cv > 0xFFFF) cv = 0xFFFF;
+ gCV[ch] = (unsigned short)cv;
+ gCV[ch+4] = OctVtoHzV(gCV[ch]);
+
+ // GATE
+ gGateBuf[midi_ch] ? gGATE |= (1<<ch) : gGATE &= ~(1<<ch);
+
+ ch++;
+ ch &= 0x03;
+}
+
+//-------------------------------------------------------------
+// Oct/V to Hz/V Converter
+
+void CalcHzVTbl() // Calc Conv. Table
+{
+ int i;
+ float v;
+
+ for( i=0; i<3072; i++) {
+ v = 24576.0 * pow(2.0,(i/3072.0));
+ gTblHzV[i] = (unsigned short)v;
+ }
+}
+
+unsigned short OctVtoHzV( unsigned short vin)
+{
+ int oct,res;
+ unsigned short vout;
+
+ if(vin > 0xE400) vin = 0xE400; // Maximum Note E8 Vin = 10.794V
+ if(vin < 0x6800) vin = 0x6800; // Minimum Note C-2 Vin = -2.000V
+ vin -= 0x6800;
+
+ oct = vin / 0xC00; // 0xC00 : 3072
+ res = vin % 0xC00;
+
+ vout = ((unsigned short)gTblHzV[res] >> (10 - oct)) + 0x8000;
+ return vout;
+}
+
+//-------------------------------------------------------------
+// DIN SYNC Control
+
+void DinSync()
+{
+ static unsigned int cnt;
+ static unsigned int cnt24 = 10;
+
+ if(gMIDISYNC_RUN) gSYNC |= (SYNC1RUN | SYNC2RUN);
+ else gSYNC &= ~(SYNC1RUN | SYNC2RUN);
+
+ if(cnt >= SYNC_TURN_TIME) gSYNC &= ~(SYNC1CLK | SYNC2CLK);
+
+ if(gMIDISYNC_CLK) {
+ gSYNC |= (SYNC1CLK | SYNC2CLK);
+ gMIDISYNC_CLK = 0;
+ cnt = 0;
+ cnt24++;
+ }
+ if(cnt24 >= 24) cnt24 = 0;
+
+ gLED3 = gSYNC & SYNC1RUN ? 1 : 0;
+ gLED4 = cnt24 < 4 ? 1 : 0;
+
+ cnt++;
+}
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