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ProMicro-for-Zynthian/zynthian-i2c-encoders_usb-t.../zynthian-i2c-encoders_usb-t...

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#include <Wire.h>
#include <MIDIUSB.h>
#include <MIDI.h>
#define COMMAND_HEADER 0 // Value of I2C command message header
#define CMD_RESET 0 // Reset command
#define DEBOUNCE_TIME 50 // Time in ms to ignore switch value change after previous change
#define ROT_THRESHOLD 10 // Threshold at which to change rotational scaling
#define ROT_FAST_SCALE 10 // Factor to multiply rotational change rate for fast scrolling
enum CONTROLLER_TYPE
{
CONTROLLER_TYPE_SWITCH,
CONTROLLER_TYPE_ENCODER
};
struct Controller
{
bool dirty = false; // True if value has changed since last I2C read
int16_t value = 0; // Value
uint8_t count = 0; // Used to filter controller
uint8_t code = 0; // Used to filter encoder controller
uint8_t type; // Controller type (see CONTROLLER_TYPE)
uint32_t time; // Time of last update (ms since boot)
int16_t getValue() // Get the controller value with any required processing
{
int nValue = value;
switch(type)
{
case CONTROLLER_TYPE_ENCODER:
nValue = value;
value = 0; // Reset relative position
break;
case CONTROLLER_TYPE_SWITCH:
nValue = value;
}
return nValue;
}
};
static const uint8_t anValid[] = {0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0}; // Table of valid encoder states
static const uint8_t SwitchInputPins[] = {10,16,14,15};
static const uint8_t EncoderInputPins[] = {4,5,6,7,18,19,20,21};
static const uint8_t InterruptPin = 9;
static const uint8_t MAX_CONTROLLERS = sizeof(SwitchInputPins) + sizeof(EncoderInputPins) / 2; // Quantity of controllers
static const uint8_t SWITCH_REG_START = 65; // Offset of on / off switch I2C register
static const uint8_t ENCODER_REG_START = 115; // Offset of rotary encoder I2C register
static const uint8_t SWITCH_START = 0; // Offset of on / off switch controls in controller table
static const uint8_t ENCODER_START = sizeof(SwitchInputPins); // Offset of rotary encoder controls in controller table
Controller g_anControllers[MAX_CONTROLLERS]; // Array of controller objects
uint8_t g_nI2Cregister = 0; // Address of I2C register requested by I2C master (index of controller - 1 based)
uint8_t g_nLastRead = 0; // The index of the controller last read
MIDI_CREATE_DEFAULT_INSTANCE();
void setup() {
MIDI.begin(MIDI_CHANNEL_OFF);
pinMode(LED_BUILTIN_TX,INPUT); //swithc rx and tx leds of, so they don't blink on midi
pinMode(LED_BUILTIN_RX,INPUT);
//Serial.stop;
/*
Serial.begin(9600);
Serial.println("Starting");
Serial.print("Controllers: ");
Serial.println(MAX_CONTROLLERS);
Serial.print("Encoders start at ");
Serial.println(ENCODER_START);
*/
for(uint8_t i = 0; i < sizeof(SwitchInputPins); ++i)
pinMode(SwitchInputPins[i], INPUT_PULLUP);
for(uint8_t i = 0; i < sizeof(EncoderInputPins); ++i)
pinMode(EncoderInputPins[i], INPUT_PULLUP);
pinMode(InterruptPin, OUTPUT);
for(int i = 0; i < ENCODER_START; ++i)
g_anControllers[i].type = CONTROLLER_TYPE_SWITCH;
for(int i = ENCODER_START; i < MAX_CONTROLLERS; ++i)
g_anControllers[i].type = CONTROLLER_TYPE_ENCODER;
Wire.begin(8); // I2C address is 8
Wire.onRequest(onI2Crequest);
Wire.onReceive(onI2Creceive);
}
/** @brief Get the next controller who's values has changed since last I2C request
* @retval uint8_t Index of controller (1 based) or 0 for none
* @note Avoids one controller hogging bus by starting scan after last read controller
*/
uint8_t getDirty()
{
// Iterate through all controllers looking for changed, starting at controller after last read then wrapping round
for(uint8_t i = g_nLastRead; i < MAX_CONTROLLERS; ++i)
{
if(g_anControllers[i].dirty)
{
digitalWrite(InterruptPin, LOW);
if(i < ENCODER_START) {
return(i + SWITCH_REG_START);
}
else {
return(i - ENCODER_START + ENCODER_REG_START);
}
}
}
for(uint8_t i = 0; i < g_nLastRead; ++i)
{
if(g_anControllers[i].dirty)
{
digitalWrite(InterruptPin, LOW);
if(i < ENCODER_START) {
return(i + SWITCH_REG_START);
}
else {
return(i - ENCODER_START + ENCODER_REG_START);
}
}
}
digitalWrite(InterruptPin, HIGH);
return 0;
}
/** @brief Reset all controller values
* @todo Should we set values to current readings?
*/
void reset()
{
for(uint8_t i = 0; i < MAX_CONTROLLERS; ++i)
{
g_anControllers[i].value = 0;
g_anControllers[i].dirty = false;
}
g_nLastRead = 0;
digitalWrite(InterruptPin, HIGH);
//Serial.println("RESET");
}
void sendReg(uint8_t nReg)
{
//Wire.flush();
uint16_t nValue = 0;
uint8_t data[2];
if(nReg >= SWITCH_REG_START && nReg < SWITCH_REG_START + sizeof(SwitchInputPins))
{
nValue = g_anControllers[nReg - SWITCH_REG_START].value;
g_anControllers[nReg - SWITCH_REG_START].dirty = false;
g_nLastRead = nReg - SWITCH_REG_START + 1;
}
else if(nReg >= ENCODER_REG_START && nReg < ENCODER_REG_START + sizeof(EncoderInputPins) / 2)
{
nValue = g_anControllers[nReg - ENCODER_REG_START + ENCODER_START].value;
g_anControllers[nReg - ENCODER_REG_START + ENCODER_START].dirty = false;
g_anControllers[nReg - ENCODER_REG_START + ENCODER_START].value = 0;
g_nLastRead = nReg - ENCODER_REG_START + ENCODER_START + 1;
}
if(g_nLastRead >= MAX_CONTROLLERS)
g_nLastRead = 0;
data[0] = nValue & 0xFF;
data[1] = (nValue & 0xFF00) >> 8;
Wire.write(data, 2);
getDirty();
/*
Serial.println();
Serial.print("I2C Tx reg: ");
Serial.print(nReg);
Serial.print(" value: ");
Serial.print(nValue);
Serial.print(":");
Serial.print(g_anControllers[nValue].value);
Serial.print(":");
Serial.print(data[0]);
Serial.print(data[1]);
Serial.println();
*/
}
void onI2Crequest() {
if(g_nI2Cregister)
{
// Send value of requested controller
sendReg(g_nI2Cregister);
//Serial.println(g_nI2Cregister);
g_nI2Cregister = 0;
return;
}
// Send index of first changed controller or zero if all clean
//Wire.flush(); // Seem to need to flush I2C to ensure single byte of data is sent correctly
Wire.write(getDirty());
}
void onI2Creceive(int nBytes) {
if(nBytes < 1)
return;
int nValue = Wire.read();
if(nValue == COMMAND_HEADER && nBytes > 1)
{
nValue = Wire.read();
switch(nValue)
{
case CMD_RESET:
reset();
break;
}
}
else
{
g_nI2Cregister = nValue;
}
while(Wire.available())
Wire.read(); // Clear buffer of unexpected bytes
}
void readEncoder() {
int8_t nDir = 0; // Direction of rotation [-1, 0, +1]
for(uint8_t n = 0; n < sizeof(EncoderInputPins) / 2; ++n) {
int nEncoder = n + ENCODER_START;
int nClk = digitalRead(EncoderInputPins[n*2]);
if(!nClk && !g_anControllers[nEncoder].code)
continue; // Ignore encoder if clock not asserted or not mid-decode
int nData = digitalRead(EncoderInputPins[n*2+1]);
g_anControllers[nEncoder].code <<= 2;
if(nData)
g_anControllers[nEncoder].code |= 0x02;
if(nClk)
g_anControllers[nEncoder].code |= 0x01;
g_anControllers[nEncoder].code &= 0x0f;
// If valid then add to 8-bit history validate rotation codes and process
if(anValid[g_anControllers[nEncoder].code]) {
g_anControllers[nEncoder].count <<= 4;
g_anControllers[nEncoder].count |= g_anControllers[nEncoder].code;
if(g_anControllers[nEncoder].count == 0xd4)
nDir = +1;
else if(g_anControllers[nEncoder].count == 0x17)
nDir = -1;
if(nDir)
{
//Inhibit fast rotation as it doesn't really work well
//uint32_t lNow = millis();
//if(lNow >= g_anControllers[nEncoder].time + ROT_THRESHOLD)
g_anControllers[nEncoder].value += nDir; //Slow rotation
//else
//g_anControllers[nEncoder].value += nDir * ROT_FAST_SCALE; //Fast rotation
//g_anControllers[nEncoder].time = lNow;
g_anControllers[nEncoder].code = 0;
g_anControllers[nEncoder].dirty = true;
/*
Serial.print("Encoder ");
Serial.print(nEncoder);
Serial.print(":");
Serial.print(g_anControllers[nEncoder].value);
Serial.println("");
*/
}
}
}
}
void readSwitch() {
for(uint8_t n = 0; n < sizeof(SwitchInputPins); ++n) {
int nSwitch = n;
int nValue = !digitalRead(SwitchInputPins[n]);//*(-1))+1;
if(nValue != g_anControllers[nSwitch].value && millis() > g_anControllers[nSwitch].time + DEBOUNCE_TIME)
{
// Note: Initial testing suggests that debounce is not required but it is added to handle noisy switches
g_anControllers[nSwitch].value = nValue;
g_anControllers[nSwitch].time = millis();
g_anControllers[nSwitch].dirty = true;
/*
Serial.print("Switch ");
Serial.print(SWITCH_START + nSwitch);
Serial.print(":");
Serial.print(g_anControllers[SWITCH_START + nSwitch].value);
Serial.println("");
*/
}
}
}
void loop() {
readSwitch();
readEncoder();
getDirty();
USBtoMIDI();
}
void USBtoMIDI() {
midiEventPacket_t rx;
do {
rx = MidiUSB.read();
if (rx.header != 0) {
MIDI.send(rx.byte1, rx.byte2, rx.byte3, 0x01);
/*
Serial.print("Received: ");
Serial.print(rx.header, HEX);
Serial.print("-");
Serial.print(rx.byte1, DEC);
Serial.print("-");
Serial.print(rx.byte2, DEC);
Serial.print("-");
Serial.println(rx.byte3, DEC);
Serial.println(rx.byte1-(rx.header << 4), DEC); //Channel
*/
}
} while (rx.header != 0);
}
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