awonak/libGravity
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libGravity/firmware/Rhythm/Rhythm.ino

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#include "maps.h"
#include <EEPROM.h>
#include <Wire.h>
#include <libGravity.h>
// Configuration
const int MAX_DENSITY = 255;
const int MAP_RESOLUTION = 255;
const int MAX_CHAOS = 255;
// EEPROM addrs
const int EEPROM_INIT_ADDR = 0;
const int EEPROM_CV1 = EEPROM_INIT_ADDR + sizeof(byte);
const int EEPROM_CV2 = EEPROM_CV1 + sizeof(int);
const int EEPROM_PATTERNS = EEPROM_CV2 + sizeof(int);
const byte EEPROM_INIT_FLAG = 0xAF; // Update flag to re-init properly allocated memory
// EEPROM Delay Save
const unsigned long SAVE_DELAY_MS = 5000;
bool eeprom_needs_save = false;
unsigned long last_param_change = 0;
// Menus and State
struct PatternState {
int inst_density[3] = {128, 128, 128};
int map_x = 0;
int map_y = 127;
int chaos_amount = 0;
};
PatternState patterns[5];
int selected_slot = 1; // 0 = Global, 1-5 = Pattern A-E
int active_pattern = 0; // Tracks playback pattern index (0-4)
enum GlobalParam {
PARAM_GLOBAL_CLK_SRC = 0,
PARAM_GLOBAL_BPM = 1,
PARAM_GLOBAL_CV1_DEST = 2,
PARAM_GLOBAL_CV2_DEST = 3,
PARAM_GLOBAL_LAST = 4
};
enum CvDest {
CV_DEST_NONE = 0,
CV_DEST_KICK_DENS = 1,
CV_DEST_SNARE_DENS = 2,
CV_DEST_HHAT_DENS = 3,
CV_DEST_CHAOS = 4,
CV_DEST_MAP_X = 5,
CV_DEST_MAP_Y = 6,
CV_DEST_PRESET = 7,
CV_DEST_LAST = 8
};
GlobalParam current_global_param = PARAM_GLOBAL_CLK_SRC;
CvDest cv1_dest = CV_DEST_MAP_X;
CvDest cv2_dest = CV_DEST_CHAOS;
Clock::Source selected_source = Clock::SOURCE_INTERNAL;
// UI & Navigation
enum SelectedParam {
PARAM_KICK_DENS = 0,
PARAM_SNARE_DENS = 1,
PARAM_HIHAT_DENS = 2,
PARAM_CHAOS = 3,
PARAM_MAP_X = 4,
PARAM_MAP_Y = 5,
PARAM_LAST = 6
};
SelectedParam current_param = PARAM_KICK_DENS;
bool editing_param = false;
bool needs_redraw = true;
unsigned long last_redraw = 0;
const unsigned long REDRAW_DELAY_MS = 30; // ~33fps limit
// Sequencer State
int current_step = 0;
volatile int cv1_val = 0;
volatile int cv2_val = 0;
int last_mapped_slot = -1;
// LFSR State for Chaos
uint16_t lfsr = 0xACE1;
// Math Helper: 1D Linear Interpolation between two bytes
uint8_t lerp(uint8_t a, uint8_t b, uint8_t t) {
// t is 0-255. returns a if t=0, b if t=255
return a + (((b - a) * t) >> 8);
}
// Math Helper: Get threshold from 2D map via interpolation
uint8_t GetThreshold(int inst, int step, int x_pos, int y_pos) {
// x_pos is 0-255 mapped across 4 nodes (0, 1, 2, 3). Distance is 85 (255 / 3)
// y_pos is 0-255 mapped across 4 nodes (0, 1, 2, 3). Distance is 85 (255 / 3)
int x_idx = x_pos / 85;
int y_idx = y_pos / 85;
uint8_t x_frac = (x_pos % 85) * 3; // scale remainder 0-84 up to 0-255
uint8_t y_frac = (y_pos % 85) * 3;
// Guard against out of bounds if exactly 255
if (x_idx >= 3) {
x_idx = 2;
x_frac = 255;
}
if (y_idx >= 3) {
y_idx = 2;
y_frac = 255;
}
// Read 4 corners from PROGMEM
uint8_t p00 = pgm_read_byte(&PATTERN_MAPS[x_idx][y_idx][inst][step]);
uint8_t p10 = pgm_read_byte(&PATTERN_MAPS[x_idx + 1][y_idx][inst][step]);
uint8_t p01 = pgm_read_byte(&PATTERN_MAPS[x_idx][y_idx + 1][inst][step]);
uint8_t p11 = pgm_read_byte(&PATTERN_MAPS[x_idx + 1][y_idx + 1][inst][step]);
// Bilinear interpolation
uint8_t lerp_top = lerp(p00, p10, x_frac);
uint8_t lerp_bottom = lerp(p01, p11, x_frac);
return lerp(lerp_top, lerp_bottom, y_frac);
}
void LoadState() {
if (EEPROM.read(EEPROM_INIT_ADDR) == EEPROM_INIT_FLAG) {
EEPROM.get(EEPROM_CV1, cv1_dest);
EEPROM.get(EEPROM_CV2, cv2_dest);
EEPROM.get(EEPROM_PATTERNS, patterns);
}
}
void SaveState() {
EEPROM.update(EEPROM_INIT_ADDR, EEPROM_INIT_FLAG);
EEPROM.put(EEPROM_CV1, cv1_dest);
EEPROM.put(EEPROM_CV2, cv2_dest);
EEPROM.put(EEPROM_PATTERNS, patterns);
}
// LFSR random bit generator (returns 0 or 1, fast)
uint8_t GetRandomBit() {
uint8_t bit = ((lfsr >> 0) ^ (lfsr >> 2) ^ (lfsr >> 3) ^ (lfsr >> 5)) & 1;
lfsr = (lfsr >> 1) | (bit << 15);
return bit;
}
// Get 8-bit pseudo-random number
uint8_t GetRandomByte() {
uint8_t r = 0;
for (int i = 0; i < 8; i++) {
r = (r << 1) | GetRandomBit();
}
return r;
}
void ProcessSequencerTick(uint32_t tick) {
// Assuming 96 PPQN clock. We want 16th notes.
// 96 pulses per quarter note / 4 = 24 pulses per 16th note.
const int PULSES_PER_16TH = 24;
// Pulse logic outputs low halfway through the 16th note (12 pulses)
if (tick % PULSES_PER_16TH == 12) {
for (int i = 0; i < 6; i++) {
gravity.outputs[i].Low();
}
}
// Handle new 16th note step
if (tick % PULSES_PER_16TH == 0) {
// Evaluate CV Preset changes FIRST so params pull from the right struct
int preset_cv = 0;
if (cv1_dest == CV_DEST_PRESET) preset_cv += cv1_val;
if (cv2_dest == CV_DEST_PRESET) preset_cv += cv2_val;
if (cv1_dest == CV_DEST_PRESET || cv2_dest == CV_DEST_PRESET) {
int mapped_slot = constrain(map(preset_cv, 0, 512, 0, 4), 0, 4);
if (mapped_slot != last_mapped_slot) {
last_mapped_slot = mapped_slot;
if (active_pattern != mapped_slot) {
active_pattern = mapped_slot;
selected_slot = mapped_slot + 1;
needs_redraw = true;
}
}
} else {
last_mapped_slot = -1;
}
PatternState &p = patterns[active_pattern];
int active_map_x = p.map_x;
int active_map_y = p.map_y;
int active_chaos = p.chaos_amount;
int active_dens[3] = { p.inst_density[0], p.inst_density[1], p.inst_density[2] };
// Apply CV1
switch (cv1_dest) {
case CV_DEST_KICK_DENS: active_dens[0] = constrain(active_dens[0] + (cv1_val / 4), 0, 255); break;
case CV_DEST_SNARE_DENS: active_dens[1] = constrain(active_dens[1] + (cv1_val / 4), 0, 255); break;
case CV_DEST_HHAT_DENS: active_dens[2] = constrain(active_dens[2] + (cv1_val / 4), 0, 255); break;
case CV_DEST_CHAOS: active_chaos = constrain(active_chaos + (cv1_val / 4), 0, 255); break;
case CV_DEST_MAP_X: active_map_x = constrain(active_map_x + (cv1_val / 4), 0, 255); break;
case CV_DEST_MAP_Y: active_map_y = constrain(active_map_y + (cv1_val / 4), 0, 255); break;
default: break;
}
// Apply CV2
switch (cv2_dest) {
case CV_DEST_KICK_DENS: active_dens[0] = constrain(active_dens[0] + (cv2_val / 4), 0, 255); break;
case CV_DEST_SNARE_DENS: active_dens[1] = constrain(active_dens[1] + (cv2_val / 4), 0, 255); break;
case CV_DEST_HHAT_DENS: active_dens[2] = constrain(active_dens[2] + (cv2_val / 4), 0, 255); break;
case CV_DEST_CHAOS: active_chaos = constrain(active_chaos + (cv2_val / 4), 0, 255); break;
case CV_DEST_MAP_X: active_map_x = constrain(active_map_x + (cv2_val / 4), 0, 255); break;
case CV_DEST_MAP_Y: active_map_y = constrain(active_map_y + (cv2_val / 4), 0, 255); break;
default: break;
}
// Evaluate hits for Kick, Snare, HiHats
for (int inst = 0; inst < 3; inst++) {
uint8_t threshold = GetThreshold(inst, current_step, active_map_x, active_map_y);
int active_density = active_dens[inst];
// Inject chaos
if (active_chaos > 0) {
// Chaos randomly adds or subtracts from density.
int r = GetRandomByte();
int chaos_variance = map(active_chaos, 0, 255, 0, 128);
if (GetRandomBit()) {
active_density += map(r, 0, 255, 0, chaos_variance);
} else {
active_density -= map(r, 0, 255, 0, chaos_variance);
}
active_density = constrain(active_density, 0, 255);
}
// Fire Trigger?
if (active_density > threshold) {
// Output 1-3
gravity.outputs[inst].High();
// Fire Accent Trigger? (If density greatly exceeds threshold)
if (active_density > threshold + 60) {
// Output 4-6
gravity.outputs[inst + 3].High();
}
}
}
current_step = (current_step + 1) % 16;
}
}
void OnPlayPress() {
if (!gravity.clock.IsPaused()) {
gravity.clock.Stop();
for (int i = 0; i < 6; i++)
gravity.outputs[i].Low();
} else {
gravity.clock.Start();
}
needs_redraw = true;
}
void OnEncoderPress() {
editing_param = !editing_param;
needs_redraw = true;
}
void OnEncoderPressRotate(int val) {
selected_slot = constrain(selected_slot + val, 0, 5);
if (selected_slot > 0) {
active_pattern = selected_slot - 1;
}
// Reset editing state when swapping pages
editing_param = false;
needs_redraw = true;
}
// Map CV Destination enum string labels
const char* GetCvDestName(CvDest dest) {
switch(dest) {
case CV_DEST_NONE: return "NONE";
case CV_DEST_KICK_DENS: return "KICK DENS";
case CV_DEST_SNARE_DENS: return "SNAR DENS";
case CV_DEST_HHAT_DENS: return "HHAT DENS";
case CV_DEST_CHAOS: return "CHAOS";
case CV_DEST_MAP_X: return "MAP X";
case CV_DEST_MAP_Y: return "MAP Y";
case CV_DEST_PRESET: return "PRESET";
default: return "";
}
}
void OnEncoderRotate(int val) {
if (!editing_param) {
// Navigate menu (clamp to edges, do not wrap)
if (selected_slot > 0) {
int next_param = (int)current_param + val;
next_param = constrain(next_param, 0, PARAM_LAST - 1);
current_param = (SelectedParam)next_param;
} else {
int next_param = (int)current_global_param + val;
next_param = constrain(next_param, 0, PARAM_GLOBAL_LAST - 1);
current_global_param = (GlobalParam)next_param;
}
} else {
// Edit parameter
if (selected_slot > 0) {
int amt = val * 8; // Adjust by 8 values at a time for speed mapping
PatternState &p = patterns[active_pattern];
switch (current_param) {
case PARAM_KICK_DENS:
p.inst_density[0] = constrain(p.inst_density[0] + amt, 0, 255);
break;
case PARAM_SNARE_DENS:
p.inst_density[1] = constrain(p.inst_density[1] + amt, 0, 255);
break;
case PARAM_HIHAT_DENS:
p.inst_density[2] = constrain(p.inst_density[2] + amt, 0, 255);
break;
case PARAM_CHAOS:
p.chaos_amount = constrain(p.chaos_amount + amt, 0, 255);
break;
case PARAM_MAP_X:
p.map_x = constrain(p.map_x + amt, 0, 255);
break;
case PARAM_MAP_Y:
p.map_y = constrain(p.map_y + amt, 0, 255);
break;
default:
break;
}
} else {
// Edit Global Parameter
switch (current_global_param) {
case PARAM_GLOBAL_CLK_SRC: {
int src = (int)selected_source + val;
src = constrain(src, 0, Clock::SOURCE_LAST - 1);
selected_source = (Clock::Source)src;
gravity.clock.SetSource(selected_source);
break;
}
case PARAM_GLOBAL_BPM: {
if (!gravity.clock.ExternalSource()) {
gravity.clock.SetTempo(gravity.clock.Tempo() + val);
}
break;
}
case PARAM_GLOBAL_CV1_DEST: {
int dest = (int)cv1_dest + val;
dest = constrain(dest, 0, CV_DEST_LAST - 1);
cv1_dest = (CvDest)dest;
break;
}
case PARAM_GLOBAL_CV2_DEST: {
int dest = (int)cv2_dest + val;
dest = constrain(dest, 0, CV_DEST_LAST - 1);
cv2_dest = (CvDest)dest;
break;
}
default:
break;
}
}
eeprom_needs_save = true;
last_param_change = millis();
}
needs_redraw = true;
}
#include "display_assets.h"
constexpr uint8_t SCREEN_CENTER_X = 32;
constexpr uint8_t MAIN_TEXT_Y = 26;
constexpr uint8_t SUB_TEXT_Y = 40;
constexpr uint8_t VISIBLE_MENU_ITEMS = 3;
constexpr uint8_t MENU_ITEM_HEIGHT = 14;
constexpr uint8_t MENU_BOX_PADDING = 4;
constexpr uint8_t MENU_BOX_WIDTH = 64;
void drawCenteredText(const char *text, int y, const uint8_t *font) {
gravity.display.setFont(font);
int textWidth = gravity.display.getStrWidth(text);
gravity.display.drawStr(SCREEN_CENTER_X - (textWidth / 2), y, text);
}
void drawRightAlignedText(const char *text, int y) {
int textWidth = gravity.display.getStrWidth(text);
int drawX = (SCREEN_WIDTH - textWidth) - MENU_BOX_PADDING;
gravity.display.drawStr(drawX, y, text);
}
void drawMainSelection() {
gravity.display.setDrawColor(1);
const int tickSize = 3;
const int mainWidth = SCREEN_WIDTH / 2;
const int mainHeight = 49;
gravity.display.drawLine(0, 0, tickSize, 0);
gravity.display.drawLine(0, 0, 0, tickSize);
gravity.display.drawLine(mainWidth, 0, mainWidth - tickSize, 0);
gravity.display.drawLine(mainWidth, 0, mainWidth, tickSize);
gravity.display.drawLine(mainWidth, mainHeight, mainWidth,
mainHeight - tickSize);
gravity.display.drawLine(mainWidth, mainHeight, mainWidth - tickSize,
mainHeight);
gravity.display.drawLine(0, mainHeight, tickSize, mainHeight);
gravity.display.drawLine(0, mainHeight, 0, mainHeight - tickSize);
}
void drawMenuItems(String menu_items[], int menu_size, int current_item) {
gravity.display.setFont(TEXT_FONT);
int selectedBoxY = 0;
if (menu_size >= VISIBLE_MENU_ITEMS && current_item == menu_size - 1) {
selectedBoxY = MENU_ITEM_HEIGHT * min(2, current_item);
} else if (current_item > 0) {
selectedBoxY = MENU_ITEM_HEIGHT;
}
int boxX = MENU_BOX_WIDTH + 1;
int boxY = selectedBoxY + 2;
int boxWidth = MENU_BOX_WIDTH - 1;
int boxHeight = MENU_ITEM_HEIGHT + 1;
gravity.display.setDrawColor(1);
if (editing_param) {
gravity.display.drawBox(boxX, boxY, boxWidth, boxHeight);
drawMainSelection();
} else {
gravity.display.drawFrame(boxX, boxY, boxWidth, boxHeight);
}
gravity.display.setDrawColor(2);
int start_index = 0;
if (menu_size >= VISIBLE_MENU_ITEMS && current_item == menu_size - 1) {
start_index = menu_size - VISIBLE_MENU_ITEMS;
} else if (current_item > 0) {
start_index = current_item - 1;
}
for (int i = 0; i < min(menu_size, (int)VISIBLE_MENU_ITEMS); ++i) {
int idx = start_index + i;
drawRightAlignedText(menu_items[idx].c_str(),
MENU_ITEM_HEIGHT * (i + 1) - 1);
}
}
void DisplayMainArea() {
gravity.display.setFontMode(1);
gravity.display.setDrawColor(2);
String mainText;
String subText;
if (selected_slot > 0) {
PatternState &p = patterns[active_pattern];
switch (current_param) {
case PARAM_KICK_DENS:
mainText = String(map(p.inst_density[0], 0, 255, 0, 100)) + "%";
subText = "KICK DENS";
break;
case PARAM_SNARE_DENS:
mainText = String(map(p.inst_density[1], 0, 255, 0, 100)) + "%";
subText = "SNAR DENS";
break;
case PARAM_HIHAT_DENS:
mainText = String(map(p.inst_density[2], 0, 255, 0, 100)) + "%";
subText = "HHAT DENS";
break;
case PARAM_CHAOS:
mainText = String(map(p.chaos_amount, 0, 255, 0, 100)) + "%";
subText = "CHAOS";
break;
case PARAM_MAP_X:
mainText = String(p.map_x);
subText = "MAP X";
break;
case PARAM_MAP_Y:
mainText = String(p.map_y);
subText = "MAP Y";
break;
default:
break;
}
drawCenteredText(mainText.c_str(), MAIN_TEXT_Y, LARGE_FONT);
drawCenteredText(subText.c_str(), SUB_TEXT_Y, TEXT_FONT);
String menu_items[PARAM_LAST] = {
"KICK", "SNARE", "HHAT", "CHAOS", "MAP X", "MAP Y"};
drawMenuItems(menu_items, PARAM_LAST, (int)current_param);
} else {
switch (current_global_param) {
case PARAM_GLOBAL_CLK_SRC:
switch (selected_source) {
case Clock::SOURCE_INTERNAL:
mainText = F("INT");
subText = F("CLOCK");
break;
case Clock::SOURCE_EXTERNAL_PPQN_24:
mainText = F("EXT");
subText = F("24 PPQN");
break;
case Clock::SOURCE_EXTERNAL_PPQN_4:
mainText = F("EXT");
subText = F("4 PPQN");
break;
case Clock::SOURCE_EXTERNAL_PPQN_2:
mainText = F("EXT");
subText = F("2 PPQN");
break;
case Clock::SOURCE_EXTERNAL_PPQN_1:
mainText = F("EXT");
subText = F("1 PPQN");
break;
case Clock::SOURCE_EXTERNAL_MIDI:
mainText = F("EXT");
subText = F("MIDI");
break;
}
break;
case PARAM_GLOBAL_BPM:
if (gravity.clock.ExternalSource()) {
mainText = F("EXT");
} else {
mainText = String(gravity.clock.Tempo());
}
subText = F("BPM");
break;
case PARAM_GLOBAL_CV1_DEST:
mainText = F("CV1");
subText = GetCvDestName(cv1_dest);
break;
case PARAM_GLOBAL_CV2_DEST:
mainText = F("CV2");
subText = GetCvDestName(cv2_dest);
break;
default:
break;
}
drawCenteredText(mainText.c_str(), MAIN_TEXT_Y, LARGE_FONT);
drawCenteredText(subText.c_str(), SUB_TEXT_Y, TEXT_FONT);
String menu_items[PARAM_GLOBAL_LAST] = {
"SOURCE", "TEMPO", "CV1 DEST", "CV2 DEST"};
drawMenuItems(menu_items, PARAM_GLOBAL_LAST, (int)current_global_param);
}
}
void DisplayBottomBar() {
int boxY = 50;
int boxHeight = 14;
gravity.display.setDrawColor(1);
gravity.display.drawHLine(1, boxY, SCREEN_WIDTH - 2);
gravity.display.drawVLine(SCREEN_WIDTH - 1, boxY, boxHeight);
for (int i = 0; i <= 5; i++) {
int x = i * 21;
int bw = (i == 5) ? (SCREEN_WIDTH - x) : 21;
gravity.display.setDrawColor(1);
if (selected_slot == i) {
gravity.display.drawBox(x, boxY, bw, boxHeight);
} else {
gravity.display.drawVLine(x, boxY, boxHeight);
}
gravity.display.setDrawColor(2);
if (i == 0) {
gravity.display.setBitmapMode(1);
auto icon = gravity.clock.IsPaused() ? pause_icon : play_icon;
int iconX = x + (bw / 2) - (play_icon_width / 2);
gravity.display.drawXBMP(iconX, boxY, play_icon_width, play_icon_height, icon);
} else {
char label[2] = {(char)('A' + i - 1), '\0'};
gravity.display.setFont(TEXT_FONT);
int patW = gravity.display.getStrWidth(label);
int patX = x + (bw / 2) - (patW / 2);
gravity.display.drawStr(patX, 64 - 3, label);
}
}
}
void UpdateDisplay() {
gravity.display.setFontMode(1);
DisplayMainArea();
DisplayBottomBar();
}
void setup() {
gravity.Init();
LoadState();
gravity.play_button.AttachPressHandler(OnPlayPress);
gravity.encoder.AttachPressHandler(OnEncoderPress);
gravity.encoder.AttachRotateHandler(OnEncoderRotate);
gravity.encoder.AttachPressRotateHandler(OnEncoderPressRotate);
gravity.clock.AttachIntHandler(ProcessSequencerTick);
// Default to 120 BPM internal
gravity.clock.SetTempo(120);
gravity.clock.SetSource(Clock::SOURCE_INTERNAL);
// Speed up I2C for faster OLED refreshing
Wire.setClock(400000);
}
void loop() {
gravity.Process();
// Apply CV modulation
// CV1 modulates Map X, CV2 modulates Chaos
cv1_val = gravity.cv1.Read(); // -512 to 512
cv2_val = gravity.cv2.Read();
if (eeprom_needs_save && (millis() - last_param_change > SAVE_DELAY_MS)) {
SaveState();
eeprom_needs_save = false;
}
if (needs_redraw && (millis() - last_redraw > REDRAW_DELAY_MS)) {
needs_redraw = false;
last_redraw = millis();
gravity.display.firstPage();
do {
UpdateDisplay();
} while (gravity.display.nextPage());
}
}
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