uilleann/pipe.cpp

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2020-11-11 20:20:21 -07:00
#include "pipe.h"
#include "fingering.h"
// Kludge time: this is something I did just to make my breadboard look nicer.
#define KEY_OFFSET 2
#define CLOSEDVAL 0x30
#define OPENVAL 0x70
#define GLISSANDO_STEPS (OPENVAL - CLOSEDVAL)
Pipe::Pipe() {
}
bool Pipe::Init() {
// Capacative touch sensor
if (!capSensor.begin(0x5A)) {
return false;
}
// Proximity sensor
if (paj7620Init()) {
return false;
}
// Bag button
bagSensor.begin();
// This library takes the entire program out if you poll it 5-40 times without anything connected
bag_enabled = bagSensor.isConnected();
return true;
}
void Pipe::Update() {
uint8_t glissandoKeys = 0;
// Read the bag state, if there's a bag.
// if there isn't a bag, don't try, or this library will crash the program.
if (bag_enabled) {
bag = bagSensor.isPressed();
} else {
bag = false;
}
// 0x6c is actually 8 bytes, but all 8 are always the same...
paj7620ReadReg(0x6c, 1, &kneeClosedness);
keys = 0;
glissandoKeys = 0;
for (int i=0; i<8; i++) {
uint16_t val = max(capSensor.filteredData(i+KEY_OFFSET), CLOSEDVAL);
float openness = ((val - CLOSEDVAL) / float(GLISSANDO_STEPS));
// keys = all keys which are at least touched
// glissandoKeys = all keys which are fully closed
// The glissando operation computes the difference.
if (openness < 1.0) {
glissandoOpenness = max(glissandoOpenness, openness);
bitSet(keys, i);
}
if (openness == 0.0) {
bitSet(glissandoKeys, i);
}
}
// Look up notes in the big table
note = uilleann_matrix[keys];
glissandoNote = uilleann_matrix[glissandoKeys];
// Was the high bit set? That indicates "alternate fingering", which sounds different.
altFingering = (note & 0x80);
note &= 0x7f;
glissandoNote &= 0x7f;
// If the bag is squished, jump up an octave
// But only if the left thumb is down!
if (bag && (keys & bit(7))) {
note += 12;
glissandoNote += 12;
}
// All keys closed + knee = no sound
silent = ((kneeClosedness > 240) && (keys == 0xff));
}