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shapes, smoothing pwm, etc

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This commit is contained in:
Dominic DiTaranto 2026-03-05 10:33:09 -05:00
parent b5c815671f
commit b7c5c27328
8 changed files with 544 additions and 169 deletions
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1
CMakeLists.txt
View file

@ -35,6 +35,7 @@ pico_generate_pio_header(clock ${CMAKE_CURRENT_LIST_DIR}/quadrature_encoder.pio)
# Pull in standard library and hardware abstraction
target_link_libraries(clock
pico_stdlib
hardware_pwm
hardware_gpio
hardware_pio
hardware_i2c

2
include/DisplayHandler.h
View file

@ -13,7 +13,7 @@ class DisplayHandler {
char buffer[32];
uint8_t currentScreen;
std::string screens[7];
std::array<std::string, 5> out_pages = {"Exit", "Mod", "Width", "Prob", "Mute"};
std::array<std::string, 9> out_pages = {"Exit", "Mod", "Shape", "Level", "Width", "Swing", "Prob", "Sticky", "Mute"};
bool onOutScreen = 0;
void renderMainPage();
void renderOutPage();

16
include/Gate.h
View file

@ -4,27 +4,43 @@
#include <cstdint>
#include "Output.h"
#include "globals.h"
class Gate : public Output {
private:
uint32_t dur;
uint32_t triggerCount;
uint32_t scheduledTick;
float currentRandomVal;
uint32_t len;
uint32_t lastTriggerTick = 0xFFFFFFFF;
uint64_t startTimeUs;
uint32_t pulseDurationUs;
public:
Gate(uint8_t pin);
WaveShape shape = SQUARE;
uint32_t startTick = 0;
uint32_t pulseWidthTicks = 0;
bool sticky = false;
int8_t modifierSelectionIndex;
uint8_t divideMode;
uint8_t swing = 50;
uint16_t modifier;
uint16_t tickInterval;
uint8_t level;
uint8_t width;
uint8_t p;
void turnOn() override;
void update();
void turnOff() override;
void calculatePulseWidth();
void writeAnalog(uint16_t val);
void setLen(uint32_t currentPeriod);
void setDiv(uint8_t modifier_selection_index);
void setWidth(uint16_t newWidth);

23
include/globals.h
View file

@ -35,6 +35,29 @@ static constexpr uint8_t PPQN = 96;
extern volatile uint32_t MASTER_TICK;
enum WaveShape { SQUARE, TRIANGLE, SAW, RAMP, EXP, HALFSINE, REXP, LOG, SINE, BOUNCE, SIGMO, WOBBLE, STEPDW, STEPUP, SH, SHAPE_COUNT};
inline const char* waveShapeToString(WaveShape shape) {
switch (shape) {
case SQUARE: return "SQR";
case SINE: return "SINE";
case TRIANGLE: return "TRI";
case SAW: return "SAW";
case EXP: return "EXP";
case REXP: return "REXP";
case RAMP: return "RAMP";
case LOG: return "LOG";
case BOUNCE: return "BNC";
case WOBBLE: return "WOB";
case SIGMO: return "SIG";
case STEPDW: return "STPD";
case STEPUP: return "STPU";
case SH: return "S&H";
case HALFSINE: return "HUMP";
default: return "?";
}
}
// Modifiers in UI order
static std::array<uint8_t, 17> MODIFIERS = {32, 16, 12, 8, 6, 4, 3, 2, 0, 1, 2, 3, 4, 6, 8, 16, 32};
// Modifier type; 0 = multiplicaton, 1 = division; matched with MODIFIERS

153
master_clock.drawio Normal file
View file

@ -0,0 +1,153 @@
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80
src/DisplayHandler.cpp
View file

@ -78,7 +78,43 @@ void DisplayHandler::moveCursor(bool dir) {
outputs[currentOut]->modifierSelectionIndex = std::size(MOD_TYPES) - 1;
}
} else if (currentScreen == 2) { // width control
} else if (currentScreen == 2) { // shape control
int currentShape = (int)outputs[currentOut]->shape;
if (dir == 1) {
currentShape++;
} else {
currentShape--;
}
if (currentShape >= SHAPE_COUNT) {
currentShape = 0;
}
if (currentShape < 0) {
currentShape = SHAPE_COUNT - 1;
}
outputs[currentOut]->shape = (WaveShape)currentShape;
outputs[currentOut]->writeAnalog(0);
} else if (currentScreen == 3) { // level control
outputs[currentOut]->editing = 1;
if (dir == 1) {
outputs[currentOut]->level++;
} else {
outputs[currentOut]->level--;
}
if (outputs[currentOut]->level > 100) {
outputs[currentOut]->level = 100;
}
if (outputs[currentOut]->level < 1) {
outputs[currentOut]->level = 1;
}
} else if (currentScreen == 4) { // width control
outputs[currentOut]->editing = 1;
if (dir == 1) {
outputs[currentOut]->width++;
@ -96,7 +132,23 @@ void DisplayHandler::moveCursor(bool dir) {
outputs[currentOut]->setWidth(outputs[currentOut]->width);
} else if (currentScreen == 3) { // PROBABILITY
} else if (currentScreen == 5) { // SWING
outputs[currentOut]->editing = 1;
if (dir == 1) {
outputs[currentOut]->swing++;
} else {
outputs[currentOut]->swing--;
}
if (outputs[currentOut]->swing > 100) {
outputs[currentOut]->swing = 100;
}
if (outputs[currentOut]->swing < 50) {
outputs[currentOut]->swing = 50;
}
} else if (currentScreen == 6) { // PROBABILITY
outputs[currentOut]->editing = 1;
if (dir == 1) {
@ -112,7 +164,10 @@ void DisplayHandler::moveCursor(bool dir) {
if (outputs[currentOut]->p < 0) {
outputs[currentOut]->p = 0;
}
} else if (currentScreen == 4) { // MUTE
} else if (currentScreen == 7) { // STICKY
outputs[currentOut]->sticky ^= true;
} else if (currentScreen == 8) { // MUTE
outputs[currentOut]->editing = 1;
outputs[currentOut]->isEnabled ^= true;
@ -267,12 +322,25 @@ void DisplayHandler::renderOutPage() {
uint8_t modifier_selection_index = outputs[currentOut]->modifierSelectionIndex;
param_string = MODIFIER_STRINGS[modifier_selection_index];
} else if (currentScreen == 2) { // Width screen
} else if (currentScreen == 2) { // shape screen
param_string = waveShapeToString(outputs[currentOut]->shape);
} else if (currentScreen == 3) { // level screen
param_string = std::to_string(outputs[currentOut]->level) + "%";
} else if (currentScreen == 4) { // Width screen
param_string = std::to_string(outputs[currentOut]->width) + "%";
} else if (currentScreen == 3) { // Probability screen
} else if (currentScreen == 5) { // Swing screen
param_string = std::to_string(outputs[currentOut]->swing) + "%";
} else if (currentScreen == 6) { // Probability screen
param_string = std::to_string(outputs[currentOut]->p) + "%";
} else if (currentScreen == 4) { // Mute Screen
} else if (currentScreen == 7) { // STICKY Screen
param_string = outputs[currentOut]->sticky ? "ON" : "OFF";
} else if (currentScreen == 8) { // Mute Screen
param_string = outputs[currentOut]->isEnabled ? "ON" : "OFF";
}

415
src/Gate.cpp
View file

@ -1,196 +1,297 @@
// Gate.cpp
#include "Gate.h"
#include "globals.h"
#include "hardware/pwm.h"
#include <cstdlib>
#include <math.h>
Gate::Gate(uint8_t pin) : Output(pin){
Gate::Gate(uint8_t pin) : Output(pin) {
this->pin = pin;
state = 0;
editing = 0;
editing = 0;
modifierSelectionIndex = 8;
divideMode = 0; // 1 divison | 0 multiplication
modifier = 0; // divide mode modifier (4x, /32, etc)
modifierSelectionIndex = 8;
divideMode = 0; // 1 divison | 0 multiplication
modifier = 0; // divide mode modifier (4x, /32, etc)
dur = 0; // how long pulse is on
width = 50; // pulse width
len = 0; // max len a pulse can be on, as determined by width
dur = 0; // how long pulse is on
width = 50; // pulse width
len = 0; // max len a pulse can be on, as determined by width
p = 100; // probability of a pulse
p = 100; // probability of a pulse
level = 100;
}
void Gate::setLen(uint32_t currentPeriod) {
len = (uint32_t)((double)currentPeriod * (width / 100.0) / 1000.0);
len = (uint32_t)((double)currentPeriod * (width / 100.0) / 1000.0);
}
void Gate::setDiv(uint8_t modifier_selecton_index) {
switch(modifier_selecton_index) {
case 0: // x32
tickInterval = 3;
isEnabled = true;
divideMode = 0;
modifier = 32;
break;
case 1: // x16
tickInterval = 6;
isEnabled = true;
divideMode = 0;
modifier = 16;
break;
case 2: // x12
tickInterval = 8;
isEnabled = true;
divideMode = 0;
modifier = 12;
break;
case 3: // x8
tickInterval = 12;
isEnabled = true;
divideMode = 0;
modifier = 8;
break;
case 4: // x6
tickInterval = 16;
isEnabled = true;
divideMode = 0;
modifier = 6;
break;
case 5: // x4
tickInterval = 24;
isEnabled = true;
divideMode = 0;
modifier = 4;
break;
case 6: // x3
tickInterval = 32;
isEnabled = true;
divideMode = 0;
modifier = 3;
break;
case 7: // x2
tickInterval = 48;
isEnabled = true;
divideMode = 0;
modifier = 2;
break;
case 8: // 0 (OFF)
tickInterval = 0;
isEnabled = false;
divideMode = 0;
modifier = 0;
break;
case 9: // /1
tickInterval = 96;
isEnabled = true;
divideMode = 1;
modifier = 1;
break;
case 10: // /2
tickInterval = 192;
isEnabled = true;
divideMode = 1;
modifier = 2;
break;
case 11: // /3
tickInterval = 288;
isEnabled = true;
divideMode = 1;
modifier = 3;
break;
case 12: // /4
tickInterval = 384;
isEnabled = true;
divideMode = 1;
modifier = 4;
break;
case 13: // /6
tickInterval = 576;
isEnabled = true;
divideMode = 1;
modifier = 4;
break;
case 14: // /8
tickInterval = 768;
isEnabled = true;
divideMode = 1;
modifier = 8;
break;
case 15: // /16
tickInterval = 1536;
isEnabled = true;
divideMode = 1;
modifier = 16;
break;
case 16: // /32
tickInterval = 3072;
isEnabled = true;
divideMode = 1;
modifier = 16;
break;
default:
tickInterval = 96;
isEnabled = true;
divideMode = 1;
}
switch (modifier_selecton_index) {
case 0: // x32
tickInterval = 3;
isEnabled = true;
divideMode = 0;
modifier = 32;
break;
case 1: // x16
tickInterval = 6;
isEnabled = true;
divideMode = 0;
modifier = 16;
break;
case 2: // x12
tickInterval = 8;
isEnabled = true;
divideMode = 0;
modifier = 12;
break;
case 3: // x8
tickInterval = 12;
isEnabled = true;
divideMode = 0;
modifier = 8;
break;
case 4: // x6
tickInterval = 16;
isEnabled = true;
divideMode = 0;
modifier = 6;
break;
case 5: // x4
tickInterval = 24;
isEnabled = true;
divideMode = 0;
modifier = 4;
break;
case 6: // x3
tickInterval = 32;
isEnabled = true;
divideMode = 0;
modifier = 3;
break;
case 7: // x2
tickInterval = 48;
isEnabled = true;
divideMode = 0;
modifier = 2;
break;
case 8: // 0 (OFF)
tickInterval = 0;
isEnabled = false;
divideMode = 0;
modifier = 0;
break;
case 9: // /1
tickInterval = 96;
isEnabled = true;
divideMode = 1;
modifier = 1;
break;
case 10: // /2
tickInterval = 192;
isEnabled = true;
divideMode = 1;
modifier = 2;
break;
case 11: // /3
tickInterval = 288;
isEnabled = true;
divideMode = 1;
modifier = 3;
break;
case 12: // /4
tickInterval = 384;
isEnabled = true;
divideMode = 1;
modifier = 4;
break;
case 13: // /6
tickInterval = 576;
isEnabled = true;
divideMode = 1;
modifier = 4;
break;
case 14: // /8
tickInterval = 768;
isEnabled = true;
divideMode = 1;
modifier = 8;
break;
case 15: // /16
tickInterval = 1536;
isEnabled = true;
divideMode = 1;
modifier = 16;
break;
case 16: // /32
tickInterval = 3072;
isEnabled = true;
divideMode = 1;
modifier = 16;
break;
default:
tickInterval = 96;
isEnabled = true;
divideMode = 1;
}
// TODO: check if this is actually needed
setWidth(this->width);
setWidth(this->width);
// this is called in width, check if needed still?
calculatePulseWidth();
};
void Gate::setWidth(uint16_t newWidth) {
this->width = newWidth;
this->width = newWidth;
double ms_per_tick = (60000.0 / (double)BPM) / 96.0;
double ms_per_tick = (60000.0 / (double)BPM) / 96.0;
double ms_between_triggers = ms_per_tick * (double)this->tickInterval;
double ms_between_triggers = ms_per_tick * (double)this->tickInterval;
this->len = (uint32_t)(ms_between_triggers * (this->width / 100.0));
this->len = (uint32_t)(ms_between_triggers * (this->width / 100.0));
uint32_t max_allowed_len = (ms_between_triggers > 5) ? (uint32_t)ms_between_triggers - 2 : 1;
uint32_t max_allowed_len =
(ms_between_triggers > 5) ? (uint32_t)ms_between_triggers - 2 : 1;
if (this->len > max_allowed_len) {
this->len = max_allowed_len;
}
if (this->len > max_allowed_len) {
this->len = max_allowed_len;
}
if (this->len < 1) this->len = 1;
if (this->len < 1)
this->len = 1;
double us_per_tick = 625000.0 / (double)BPM;
calculatePulseWidth();
this->pulseDurationUs =
(uint32_t)(us_per_tick * (double)this->pulseWidthTicks);
if (this->pulseDurationUs < 100)
this->pulseDurationUs = 100;
}
void Gate::calculatePulseWidth() {
if (tickInterval == 0 || !isEnabled) {
pulseWidthTicks = 0;
return;
}
// If tickInterval is 96 and width is 50, pulseWidthTicks becomes 48
this->pulseWidthTicks =
(uint32_t)((float)this->tickInterval * (this->width / 100.0f));
// Safety: ensure a pulse is at least 1 tick long if width > 0
if (this->width > 0 && this->pulseWidthTicks == 0) {
this->pulseWidthTicks = 1;
}
}
void Gate::turnOn() {
if (!isEnabled || tickInterval == 0) return;
if (!isEnabled || tickInterval == 0)
return;
if (MASTER_TICK % tickInterval == 0) {
if (MASTER_TICK != lastTriggerTick) {
lastTriggerTick = MASTER_TICK;
if (MASTER_TICK % tickInterval == 0) {
if (MASTER_TICK != lastTriggerTick) {
lastTriggerTick = MASTER_TICK;
uint8_t pRes = 1;
if (p < 100) {
if ((rand() % 100) + 1 > p) pRes = 0;
}
if (p < 100 && (rand() % 100) + 1 > p) {
scheduledTick = 0xFFFFFFFF; // ignore interval
return;
}
if (pRes == 1) {
state = 1;
gpio_put(pin, 1);
dur = millis();
}
}
}
else {
lastTriggerTick = 0xFFFFFFFF;
// swing
triggerCount++;
uint32_t swingDelayTicks =
(uint32_t)((float)tickInterval * ((float)swing - 50.0f) / 100.0f);
if (triggerCount % 2 == 0) {
scheduledTick = MASTER_TICK + swingDelayTicks;
} else {
scheduledTick = MASTER_TICK;
}
}
}
if (MASTER_TICK == scheduledTick && !state) {
state = 1;
startTick = MASTER_TICK;
startTimeUs = time_us_64();
currentRandomVal = (float)rand() / (float)RAND_MAX;
}
}
void Gate::update() {
if (!state && !sticky)
return;
void Gate::turnOff() {
if (state == 1) {
if (millis() - dur >= len) {
state = 0;
gpio_put(pin, 0);
}
}
uint64_t now = time_us_64();
uint32_t elapsedUs = (uint32_t)(now - startTimeUs);
if (elapsedUs >= pulseDurationUs) {
state = 0;
if (!sticky)
writeAnalog(0);
return;
}
float phase = (float)elapsedUs / (float)pulseDurationUs;
float outVal = 0;
switch (shape) {
case SINE:
outVal = (sinf(phase * 2.0f * 3.14159f) * 0.5f) + 0.5f;
break;
case HALFSINE: // AKA HUMP
outVal = sinf(phase * 3.14159f);
break;
case TRIANGLE:
outVal = (phase < 0.5f) ? (phase * 2.0f) : (2.0f - (phase * 2.0f));
break;
case SAW:
outVal = 1.0f - phase;
break;
case RAMP:
outVal = phase;
break;
case EXP:
outVal = expf(-5.0f * phase);
break;
case REXP:
outVal = expf(5.0f * (phase - 1.0f));
break;
case LOG:
outVal = 1.0f - expf(-5.0f * phase);
break;
case SQUARE:
outVal = 1.0f;
break;
case BOUNCE:
outVal = fabsf(sinf(phase * 3.14159f * 2.0f));
break;
case SIGMO:
outVal = phase * phase * (3.0f - 2.0f * phase);
break;
case WOBBLE:
outVal = expf(-3.0f * phase) * cosf(phase * 3.14159f * 4.0f);
if (outVal < 0)
outVal = 0;
break;
case STEPDW:
outVal = 1.0f - (floorf(phase * 4.0f) / 3.0f);
break;
case STEPUP:
outVal = floorf(phase * 4.0f) / 3.0f;
break;
case SH:
outVal = currentRandomVal;
break;
}
writeAnalog((outVal * 1023.0f) * ((float)level / 100));
}
void Gate::writeAnalog(uint16_t val) { pwm_set_gpio_level(pin, val); }
void Gate::turnOff() { writeAnalog(0); }

17
src/main.cpp
View file

@ -10,6 +10,7 @@
#include "Gate.h"
#include "DisplayHandler.h"
#include "EncoderHandler.h"
#include "hardware/pwm.h"
// Time based operations
@ -38,7 +39,6 @@ static DisplayHandler display_handler(outputs);
static EncoderHandler encoder_handler(&display_handler);
bool timer_callback(struct repeating_timer *t) {
if (PLAY == 1) {
MASTER_TICK += 1;
@ -67,6 +67,11 @@ void update_BPM(bool up) {
}
update_period();
for (auto g : outputs) {
g->setWidth(g->width);
}
}
@ -86,6 +91,14 @@ void setup_outs() {
for (auto g : outputs) {
gpio_init(g->pin);
gpio_set_dir(g->pin, GPIO_OUT);
gpio_set_function(g->pin, GPIO_FUNC_PWM);
uint slice_num = pwm_gpio_to_slice_num(g->pin);
pwm_set_wrap(slice_num, 1023);
pwm_set_clkdiv(slice_num, 1.0f);
pwm_set_gpio_level(g->pin, 0);
pwm_set_enabled(slice_num, true);
g->setLen(period_us);
}
@ -98,7 +111,7 @@ void setup_outs() {
void handle_outs() {
for (Gate* g: outputs) {
g->turnOn();
g->turnOff();
g->update();
}
}