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billautomata/midi-computer-test.c

Created May 23, 2019 15:47
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  1. billautomata created this gist May 23, 2019.
    45 changes: 45 additions & 0 deletions midi-computer-test.c
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,45 @@
    unsigned long BPM = 120;
    unsigned long PPQ = 24;
    unsigned long PPQ_T;
    unsigned long SECONDS_IN_MINUTE = 60;
    unsigned long MICROSECONDS_PER_PPQ = (SECONDS_IN_MINUTE * 1000000) / (BPM * PPQ);

    unsigned long _micros;

    unsigned long MICROSECONDS_PER_STEP = (SECONDS_IN_MINUTE * 1000000) / (BPM * 4);
    unsigned long STEP_T;
    bool isNoteOn;

    void setup() {

    Serial.begin(56000);

    PPQ_T = micros();
    STEP_T = micros();
    _micros = micros();
    isNoteOn = false;

    }

    void loop() {

    _micros = micros();
    if(_micros - PPQ_T >= MICROSECONDS_PER_PPQ) {
    PPQ_T = _micros;
    Serial.write((int)248);
    }
    if(_micros - STEP_T >= MICROSECONDS_PER_STEP) {
    STEP_T = _micros;
    if(isNoteOn == true) {
    Serial.write((uint8_t)128); // note OFF
    Serial.write((uint8_t)60); // note value
    Serial.write((uint8_t)64); // note velocity
    isNoteOn = false;
    }
    Serial.write((uint8_t)144); // note ON
    Serial.write((uint8_t)60); // note value
    Serial.write((uint8_t)64); // note velocity
    isNoteOn = true;
    }

    }