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uClock/examples/TeensyUsbMasterMidiClock/TeensyUsbMasterMidiClock.ino

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2.2 KiB

/* USB MIDI Sync Box
*
* This example demonstrates how to change the USB MIDI
* device name on Teensy LC and 3.x. When creating more
* that one MIDI device, custom names are much easier to
* use when selecting each device in MIDI software on
* your PC or Mac. The custom name is in the "name.c" tab.
*
* Windows and Macintosh systems often cache USB info.
* After changing the name, you may need to test on a
* different computer to observe the new name, or take
* steps to get your operating system to "forget" the
* cached info. (TODO: wanted... can anyone contribute
* instructions for these systems)
*
* You must select MIDI from the "Tools > USB Type" menu
*
* This example code is in the public domain.
*/
#include <uClock.h>
uint8_t bpm_blink_timer = 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(usbMIDI.Clock);
handle_bpm_led(tick);
}
void onClockStart() {
usbMIDI.sendRealTime(usbMIDI.Start);
}
void onClockStop() {
usbMIDI.sendRealTime(usbMIDI.Stop);
}
void setup() {
// A led to count bpms
pinMode(LED_BUILTIN, OUTPUT);
// Setup our clock system
// drift for USB Teensy
uClock.setDrift(1);
// Inits the clock
uClock.init();
// Set the callback function for the clock output to send MIDI Sync message.
uClock.setClock96PPQNOutput(ClockOut96PPQN);
// Set the callback function for MIDI Start and Stop messages.
uClock.setOnClockStartOutput(onClockStart);
uClock.setOnClockStopOutput(onClockStop);
// Set the clock BPM to 126 BPM
uClock.setTempo(126);
// Starts the clock, tick-tac-tick-tac...
uClock.start();
}
// Do it whatever to interface with Clock.stop(), Clock.start(), Clock.setTempo() and integrate your environment...
void loop() {
}