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uClock/examples/TeensyUsbSlaveMidiClockMonitor/TeensyUsbSlaveMidiClockMoni...

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/* USB MIDI Sync Slave Box Monitor
*
* This example demonstrates how to create a
* MIDI hid compilant slave clock box with
* monitor support using oled displays
*
* Making use of a 250 usceconds timer to
* handle MIDI input to avoid jitter on clock
*
* You need the following libraries to make it work
* - u8g2
* - uClock
*
* This example code is in the public domain.
*/
#include <U8x8lib.h>
//
// BPM Clock support
//
#include <uClock.h>
U8X8 * u8x8;
IntervalTimer teensyTimer;
// MIDI clock, start, stop, note on and note off byte definitions - based on MIDI 1.0 Standards.
#define MIDI_CLOCK 0xF8
#define MIDI_START 0xFA
#define MIDI_STOP 0xFC
char bpm_str[4];
float bpm = 126;
uint8_t bpm_blink_timer = 1;
uint8_t clock_state = 1;
void handle_bpm_led(uint32_t tick)
{
// BPM led indicator
if ( !(tick % (96)) || (tick == 1) ) { // first compass step will flash longer
bpm_blink_timer = 8;
digitalWrite(LED_BUILTIN, HIGH);
} else if ( !(tick % (24)) ) { // each quarter led on
digitalWrite(LED_BUILTIN, HIGH);
} else if ( !(tick % bpm_blink_timer) ) { // get led off
digitalWrite(LED_BUILTIN, LOW);
bpm_blink_timer = 1;
}
}
// Internal clock handlers
void ClockOut96PPQN(uint32_t tick) {
// Send MIDI_CLOCK to external gears
usbMIDI.sendRealTime(MIDI_CLOCK);
handle_bpm_led(tick);
}
void onClockStart() {
usbMIDI.sendRealTime(MIDI_START);
}
void onClockStop() {
usbMIDI.sendRealTime(MIDI_STOP);
digitalWrite(LED_BUILTIN, LOW);
}
// External clock handlers
void onExternalClock()
{
uClock.clockMe();
}
void onExternalStart()
{
uClock.start();
}
void onExternalStop()
{
uClock.stop();
}
void setup() {
// A led to count bpms
pinMode(LED_BUILTIN, OUTPUT);
//
// MIDI setup
//
usbMIDI.begin();
usbMIDI.setHandleClock(onExternalClock);
usbMIDI.setHandleStart(onExternalStart);
usbMIDI.setHandleStop(onExternalStop);
//
// OLED setup
// Please check you oled model to correctly init him
//
u8x8 = new U8X8_SH1106_128X64_NONAME_HW_I2C(U8X8_PIN_NONE);
u8x8->begin();
u8x8->setFont(u8x8_font_pressstart2p_r);
u8x8->clear();
u8x8->drawUTF8(0, 0, "uClock");
//
// uClock Setup
//
// Setup our clock system
uClock.init();
uClock.setClock96PPQNOutput(ClockOut96PPQN);
// For MIDI Sync Start and Stop
uClock.setOnClockStartOutput(onClockStart);
uClock.setOnClockStopOutput(onClockStop);
uClock.setMode(uClock.EXTERNAL_CLOCK);
// make use of 250us timer to handle midi input sync
teensyTimer.begin(handleMidiInput, 250);
teensyTimer.priority(80);
}
void handleMidiInput() {
while (usbMIDI.read()) {
}
}
void printBpm(float _bpm, uint8_t col, uint8_t line) {
int b = (int)_bpm;
int c = (int)((_bpm-b)*10);
itoa(b, bpm_str, 10);
if (b > 99) {
u8x8->drawUTF8(col, line, bpm_str);
} else {
bpm_str[2] = '\0';
u8x8->drawUTF8(col, line, " ");
u8x8->drawUTF8(col+1, line, bpm_str);
}
u8x8->drawUTF8(col+3, line, ".");
itoa(c, bpm_str, 10);
u8x8->drawUTF8(col+4, line, bpm_str);
u8x8->drawUTF8(col+5, line, "bpm");
}
void loop() {
if (bpm != uClock.getTempo()) {
bpm = uClock.getTempo();
printBpm(bpm, 8, 7);
}
if (clock_state != uClock.state) {
clock_state = uClock.state;
if (clock_state >= 1) {
u8x8->drawUTF8(0, 7, "playing");
} else {
u8x8->drawUTF8(0, 7, "stoped ");
}
}
}