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main.c
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main.c
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/* Mini MIDI Pitchbend Joystick
* mitxela.com/projects/tiny_joystick
*/
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/eeprom.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include <stdlib.h>
#include "usbdrv.h"
#ifndef NULL
#define NULL ((void *)0)
#endif
/* ------------------------------------------------------------------------- */
const PROGMEM char deviceDescrMIDI[] = { /* USB device descriptor */
18, /* sizeof(usbDescriptorDevice): length of descriptor in bytes */
USBDESCR_DEVICE, /* descriptor type */
0x10, 0x01, /* USB version supported */
0, /* device class: defined at interface level */
0, /* subclass */
0, /* protocol */
8, /* max packet size */
USB_CFG_VENDOR_ID, /* 2 bytes */
USB_CFG_DEVICE_ID, /* 2 bytes */
USB_CFG_DEVICE_VERSION, /* 2 bytes */
1, /* manufacturer string index */
2, /* product string index */
0, /* serial number string index */
1, /* number of configurations */
};
// B.2 Configuration Descriptor
const PROGMEM char configDescrMIDI[] = { /* USB configuration descriptor */
9, /* sizeof(usbDescrConfig): length of descriptor in bytes */
USBDESCR_CONFIG, /* descriptor type */
101, 0, /* total length of data returned (including inlined descriptors) */
2, /* number of interfaces in this configuration */
1, /* index of this configuration */
0, /* configuration name string index */
0,
//USBATTR_BUSPOWER,
USB_CFG_MAX_BUS_POWER / 2, /* max USB current in 2mA units */
// B.3 AudioControl Interface Descriptors
// The AudioControl interface describes the device structure (audio function topology)
// and is used to manipulate the Audio Controls. This device has no audio function
// incorporated. However, the AudioControl interface is mandatory and therefore both
// the standard AC interface descriptor and the classspecific AC interface descriptor
// must be present. The class-specific AC interface descriptor only contains the header
// descriptor.
// B.3.1 Standard AC Interface Descriptor
// The AudioControl interface has no dedicated endpoints associated with it. It uses the
// default pipe (endpoint 0) for all communication purposes. Class-specific AudioControl
// Requests are sent using the default pipe. There is no Status Interrupt endpoint provided.
/* AC interface descriptor follows inline: */
9, /* sizeof(usbDescrInterface): length of descriptor in bytes */
USBDESCR_INTERFACE, /* descriptor type */
0, /* index of this interface */
0, /* alternate setting for this interface */
0, /* endpoints excl 0: number of endpoint descriptors to follow */
1, /* */
1, /* */
0, /* */
0, /* string index for interface */
// B.3.2 Class-specific AC Interface Descriptor
// The Class-specific AC interface descriptor is always headed by a Header descriptor
// that contains general information about the AudioControl interface. It contains all
// the pointers needed to describe the Audio Interface Collection, associated with the
// described audio function. Only the Header descriptor is present in this device
// because it does not contain any audio functionality as such.
/* AC Class-Specific descriptor */
9, /* sizeof(usbDescrCDC_HeaderFn): length of descriptor in bytes */
36, /* descriptor type */
1, /* header functional descriptor */
0x0, 0x01, /* bcdADC */
9, 0, /* wTotalLength */
1, /* */
1, /* */
// B.4 MIDIStreaming Interface Descriptors
// B.4.1 Standard MS Interface Descriptor
/* interface descriptor follows inline: */
9, /* length of descriptor in bytes */
USBDESCR_INTERFACE, /* descriptor type */
1, /* index of this interface */
0, /* alternate setting for this interface */
2, /* endpoints excl 0: number of endpoint descriptors to follow */
1, /* AUDIO */
3, /* MS */
0, /* unused */
0, /* string index for interface */
// B.4.2 Class-specific MS Interface Descriptor
/* MS Class-Specific descriptor */
7, /* length of descriptor in bytes */
36, /* descriptor type */
1, /* header functional descriptor */
0x0, 0x01, /* bcdADC */
65, 0, /* wTotalLength */
// B.4.3 MIDI IN Jack Descriptor
6, /* bLength */
36, /* descriptor type */
2, /* MIDI_IN_JACK desc subtype */
1, /* EMBEDDED bJackType */
1, /* bJackID */
0, /* iJack */
6, /* bLength */
36, /* descriptor type */
2, /* MIDI_IN_JACK desc subtype */
2, /* EXTERNAL bJackType */
2, /* bJackID */
0, /* iJack */
//B.4.4 MIDI OUT Jack Descriptor
9, /* length of descriptor in bytes */
36, /* descriptor type */
3, /* MIDI_OUT_JACK descriptor */
1, /* EMBEDDED bJackType */
3, /* bJackID */
1, /* No of input pins */
2, /* BaSourceID */
1, /* BaSourcePin */
0, /* iJack */
9, /* bLength of descriptor in bytes */
36, /* bDescriptorType */
3, /* MIDI_OUT_JACK bDescriptorSubtype */
2, /* EXTERNAL bJackType */
4, /* bJackID */
1, /* bNrInputPins */
1, /* baSourceID (0) */
1, /* baSourcePin (0) */
0, /* iJack */
// B.5 Bulk OUT Endpoint Descriptors
//B.5.1 Standard Bulk OUT Endpoint Descriptor
9, /* bLenght */
USBDESCR_ENDPOINT, /* bDescriptorType = endpoint */
0x1, /* bEndpointAddress OUT endpoint number 1 */
3, /* bmAttributes: 2:Bulk, 3:Interrupt endpoint */
8, 0, /* wMaxPacketSize */
10, /* bIntervall in ms */
0, /* bRefresh */
0, /* bSyncAddress */
// B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor
5, /* bLength of descriptor in bytes */
37, /* bDescriptorType */
1, /* bDescriptorSubtype */
1, /* bNumEmbMIDIJack */
1, /* baAssocJackID (0) */
//B.6 Bulk IN Endpoint Descriptors
//B.6.1 Standard Bulk IN Endpoint Descriptor
9, /* bLenght */
USBDESCR_ENDPOINT, /* bDescriptorType = endpoint */
0x81, /* bEndpointAddress IN endpoint number 1 */
3, /* bmAttributes: 2: Bulk, 3: Interrupt endpoint */
8, 0, /* wMaxPacketSize */
10, /* bIntervall in ms */
0, /* bRefresh */
0, /* bSyncAddress */
// B.6.2 Class-specific MS Bulk IN Endpoint Descriptor
5, /* bLength of descriptor in bytes */
37, /* bDescriptorType */
1, /* bDescriptorSubtype */
1, /* bNumEmbMIDIJack (0) */
3, /* baAssocJackID (0) */
};
uchar usbFunctionDescriptor(usbRequest_t * rq)
{
if (rq->wValue.bytes[1] == USBDESCR_DEVICE) {
usbMsgPtr = (uchar *) deviceDescrMIDI;
return sizeof(deviceDescrMIDI);
}
else { /* must be config descriptor */
usbMsgPtr = (uchar *) configDescrMIDI;
return sizeof(configDescrMIDI);
}
}
/* ------------------------------------------------------------------------- */
/* ------------------------ interface to USB driver ------------------------ */
/* ------------------------------------------------------------------------- */
uchar usbFunctionSetup(uchar data[8]) {
return 0xff;
}
uchar usbFunctionRead(uchar * data, uchar len) {
data[0] = 0;
data[1] = 0;
data[2] = 0;
data[3] = 0;
data[4] = 0;
data[5] = 0;
data[6] = 0;
return 7;
}
uchar usbFunctionWrite(uchar * data, uchar len) {
return 1;
}
// Oscillator Calibration
// Taken directly from EasyLogger:
// https://www.obdev.at/products/vusb/easylogger.html
static void calibrateOscillator(void) {
uchar step = 128;
uchar trialValue = 0, optimumValue;
int x, optimumDev, targetValue = (unsigned)(1499 * (double)F_CPU / 10.5e6 + 0.5);
/* do a binary search: */
do{
OSCCAL = trialValue + step;
x = usbMeasureFrameLength(); /* proportional to current real frequency */
if(x < targetValue) /* frequency still too low */
trialValue += step;
step >>= 1;
}while(step > 0);
/* We have a precision of +/- 1 for optimum OSCCAL here */
/* now do a neighborhood search for optimum value */
optimumValue = trialValue;
optimumDev = x; /* this is certainly far away from optimum */
for(OSCCAL = trialValue - 1; OSCCAL <= trialValue + 1; OSCCAL++){
x = usbMeasureFrameLength() - targetValue;
if(x < 0)
x = -x;
if(x < optimumDev){
optimumDev = x;
optimumValue = OSCCAL;
}
}
OSCCAL = optimumValue;
}
void usbEventResetReady(void) {
/* Disable interrupts during oscillator calibration since
* usbMeasureFrameLength() counts CPU cycles.
*/
cli();
calibrateOscillator();
sei();
eeprom_write_byte(0, OSCCAL); /* store the calibrated value in EEPROM */
}
/*
SysEx -> EEPROM stuff
USB-MIDI messages arrive at the function usbFunctionWriteOut() and may be 4 or 8 bytes.
The code index number (low nibble of the first byte) determintes if the sysex ends with
that message or if there is more data expected.
*/
#define eeFloatAddr 4
uchar mode = 0; // Currently only used to enable calibration mode
struct {
float up;
float down;
float left;
float right;
int16_t voltage[4];
int16_t limit[4];
} bendAmount;
/*
// These are example numbers that you might expect in the struct.
// This function was used for debugging the eeprom stuff.
void writeData(void){
bendAmount.up = -34.13333333333333;
bendAmount.down = -22.755555555555553;
bendAmount.left = -9.416091954022988;
bendAmount.right = 19.504761904761903;
bendAmount.voltage[0] = 478;
bendAmount.voltage[1] = 577;
bendAmount.voltage[2] = 484;
bendAmount.voltage[3] = 542;
bendAmount.limit[0]=-8192;
bendAmount.limit[1]= 5461;
bendAmount.limit[2]=-2731;
bendAmount.limit[3]=-5461;
eeprom_write_block(&bendAmount, eeFloatAddr, sizeof(bendAmount));
}
*/
void usbMidiMessageIn(uchar * data){
static uchar i = 0;
if (i==0) { //Sysex not started
if ( data[0]==0x04 //code index = sysex start/continue
&& data[1]==0xF0 // sysex begin
&& data[2]==0x12) //magic number...
{
if ( data[3]==0x34) i=eeFloatAddr;
else if ( data[3]==0x35 ) {if (0==mode) mode=2; else mode=0;}
}
} else { //sysex ongoing
if (data[0]==0x04 || data[0]==0x05 || data[0]==0x06 || data[0]==0x07) { //all sysex code index numbers
if (data[1] & 1) data[2] |=0x80;
eeprom_write_byte(i++, data[2]);
if (data[1] & 2) data[3] |=0x80;
eeprom_write_byte(i++, data[3]);
if (data[0]!=0x04) { //end of sysex
i=0;
eeprom_read_block(&bendAmount, eeFloatAddr, sizeof(bendAmount));
}
}
}
}
void usbFunctionWriteOut(uchar * data, uchar len) {
usbMidiMessageIn(data);
if (len==8) usbMidiMessageIn(data+4);
}
//////// Main ////////////
int main(void) {
uchar i;
uchar calibrationValue;
uchar midiMsg[8];
int16_t val1=0;
int16_t val2=0;
int16_t lastVal1=0;
int16_t lastVal2=0;
int16_t lastbend=8192;
uint8_t lastmod=0;
eeprom_read_block(&bendAmount, eeFloatAddr, sizeof(bendAmount));
calibrationValue = eeprom_read_byte(0); /* calibration value from last time */
if(calibrationValue != 0xff){
OSCCAL = calibrationValue;
}
usbDeviceDisconnect();
for(i=0;i<20;i++){ /* 300 ms disconnect */
_delay_ms(15);
}
usbDeviceConnect();
wdt_enable(WDTO_1S);
usbInit();
sei();
for(;;){ /* main event loop */
wdt_reset();
usbPoll();
if(usbInterruptIsReady()){
ADMUX = (1<<MUX1 | 1<<MUX0); //PB3
ADCSRA = (1<<ADEN|1<<ADSC|1<<ADIF|1<<ADPS2|1<<ADPS1);
while (!(ADCSRA & (1<<ADIF)));
val1 = ADCW;
ADMUX = (1<<MUX1); //PB4
ADCSRA = (1<<ADEN|1<<ADSC|1<<ADIF|1<<ADPS2|1<<ADPS1);
while (!(ADCSRA & (1<<ADIF)));
val2 = ADCW;
if (abs(val1-lastVal1)>1 || abs(val2-lastVal2)>1 ){
i=0;
lastVal1=val1;
lastVal2=val2;
if (mode==0) { // 4-way pitch bend
int16_t bend1=0;
int16_t bend2=0;
int16_t bend=0;
uint8_t modulation=0;
if (val1 <=bendAmount.voltage[0] ) {
bend1 = (bendAmount.voltage[0]-val1) *bendAmount.up; // -3 semitones
if (bendAmount.limit[0]<0)
{if (bend1 < bendAmount.limit[0]) bend1=bendAmount.limit[0];}
else
{if (bend1 > bendAmount.limit[0]) bend1=bendAmount.limit[0];}
} else if (val1>=bendAmount.voltage[1]) {
modulation=1;
bend1 = (bendAmount.voltage[1]-val1) *bendAmount.down; //2 semitones up
if (bendAmount.limit[1]<0)
{if (bend1 < bendAmount.limit[1]) bend1=bendAmount.limit[1];}
else
{if (bend1 > bendAmount.limit[1]) bend1=bendAmount.limit[1];}
} else bend1=0;
if (val2 <= bendAmount.voltage[2]) {
bend2 = (bendAmount.voltage[2]-val2) *bendAmount.left; //semitone down
if (bendAmount.limit[2]<0)
{if (bend2 < bendAmount.limit[2]) bend2=bendAmount.limit[2];}
else
{if (bend2 > bendAmount.limit[2]) bend2=bendAmount.limit[2];}
}else if (val2>=bendAmount.voltage[3]) {
bend2 = (bendAmount.voltage[3]-val2) *bendAmount.right; // two down
if (bendAmount.limit[3]<0)
{if (bend2 < bendAmount.limit[3]) bend2=bendAmount.limit[3];}
else
{if (bend2 > bendAmount.limit[3]) bend2=bendAmount.limit[3];}
} else bend2=0;
if (modulation) {
bend1 = ((bend1)>>6);
if (bend1<0) bend1=0;
else if (bend1>127) bend1=127;
midiMsg[i++]= 0x0B; // Cable Number, Code Index Number
midiMsg[i++]= 0xB0;
midiMsg[i++]= 1;
midiMsg[i++]= bend1&0x7F;
lastmod = midiMsg[i++];
usbSetInterrupt(midiMsg, i);
} else {
if (lastmod!=0) { //Leaving modulation region, make sure it's left at zero
midiMsg[i++]= 0x0B;
midiMsg[i++]= 0xB0;
midiMsg[i++]= 1;
midiMsg[i++]= 0;
lastmod=0;
}
bend = 8192 + (bend1 + bend2);
if (bend>16384) bend=16384;
else if (bend <0) bend=0;
if (lastbend!=bend || i) {
midiMsg[i++]= 0x0E; // Cable Number, Code Index Number
midiMsg[i++]= 0xE0;
midiMsg[i++]= (bend)&0x7F;
midiMsg[i++]= (bend>>7)&0x7F;
usbSetInterrupt(midiMsg, i);
lastbend=bend;
}
}
} else if (mode==2) { //calibration mode
midiMsg[i++]= 0x0E;
midiMsg[i++]= 0xE1;
midiMsg[i++]= (val1)&0x7F;
midiMsg[i++]= (val1>>7)&0x7F;
midiMsg[i++]= 0x0E;
midiMsg[i++]= 0xE2;
midiMsg[i++]= (val2)&0x7F;
midiMsg[i++]= (val2>>7)&0x7F;
usbSetInterrupt(midiMsg, i);
lastVal1 = 1025; // force send new data
}
}
}
}
return 0;
}