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Introduce Save/Load banks for storing different preset settings. #11

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awonak merged 8 commits from save-load-slots into main 2025-07-04 17:33:58 +00:00
Conversation 0 Commits 8 Files Changed 7 +202 -109
6 changed files with 202 additions and 109 deletions
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4
examples/Gravity/Gravity.ino
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@ -179,13 +179,13 @@ void HandleEncoderPressed() {
}
if (app.selected_param == PARAM_MAIN_SAVE_DATA) {
if (app.selected_sub_param < MAX_SAVE_SLOTS) {
app.selected_save_slot = app.selected_sub_param - 1;
app.selected_save_slot = app.selected_sub_param;
stateManager.saveData(app);
}
}
if (app.selected_param == PARAM_MAIN_LOAD_DATA) {
if (app.selected_sub_param < MAX_SAVE_SLOTS) {
app.selected_save_slot = app.selected_sub_param - 1;
app.selected_save_slot = app.selected_sub_param;
stateManager.loadData(app, app.selected_save_slot);
InitGravity(app);
}

13
examples/Gravity/display.h
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@ -153,6 +153,10 @@ void drawMenuItems(String menu_items[], int menu_size) {
}
}
// Visual indicators for main section of screen.
inline void solidTick() { gravity.display.drawBox(56, 4, 4, 4); }
inline void hollowTick() { gravity.display.drawBox(56, 4, 4, 4); }
// Display an indicator when swing percentage matches a musical note.
void swingDivisionMark() {
auto& ch = GetSelectedChannel();
@ -160,13 +164,12 @@ void swingDivisionMark() {
case 58: // 1/32nd
case 66: // 1/16th
case 75: // 1/8th
gravity.display.drawBox(56, 4, 4, 4);
solidTick();
break;
case 54: // 1/32nd tripplet
case 62: // 1/16th tripplet
case 71: // 1/8th tripplet
gravity.display.drawBox(56, 4, 4, 4);
gravity.display.drawBox(57, 5, 2, 2);
hollowTick();
break;
}
}
@ -246,6 +249,10 @@ void DisplayMainPage() {
mainText = F("x");
subText = F("BACK TO MAIN");
} else {
// Indicate currently active slot.
if (app.selected_sub_param == app.selected_save_slot) {
solidTick();
}
mainText = displaySaveSlot(app.selected_sub_param);
subText = (app.selected_param == PARAM_MAIN_SAVE_DATA)
? F("SAVE TO SLOT")

105
examples/Gravity/save_state.cpp
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@ -11,15 +11,17 @@ StateManager::StateManager() : _isDirty(false), _lastChangeTime(0) {}
bool StateManager::initialize(AppState& app) {
if (_isDataValid()) {
Metadata load_meta;
EEPROM.get(0, load_meta);
app.selected_save_slot = load_meta.active_slot;
// Load data from the last active slot.
return loadData(app, app.selected_save_slot);
// Load data from the transient slot.
return loadData(app, MAX_SAVE_SLOTS);
} else {
// TODO: save default state to all save slots.
// EEPROM does not contain save data for this firmware & version.
// Initialize eeprom and save default patter to all save slots.
reset(app);
_saveMetadata();
for (int i = 0; i <= MAX_SAVE_SLOTS; i++) {
app.selected_save_slot = i;
_saveState(app, i);
}
return false;
}
}
@ -27,35 +29,7 @@ bool StateManager::initialize(AppState& app) {
bool StateManager::loadData(AppState& app, byte slot_index) {
if (slot_index >= MAX_SAVE_SLOTS) return false;
static EepromData load_data;
int address = EEPROM_DATA_START_ADDR + (slot_index * sizeof(EepromData));
EEPROM.get(address, load_data);
// TODO: Validate loaded data.
// Restore app state from loaded data.
app.tempo = load_data.tempo;
app.encoder_reversed = load_data.encoder_reversed;
app.selected_param = load_data.selected_param;
app.selected_channel = load_data.selected_channel;
app.selected_source = static_cast<Clock::Source>(load_data.selected_source);
app.selected_pulse = static_cast<Clock::Pulse>(load_data.selected_pulse);
app.selected_save_slot = slot_index;
for (int i = 0; i < Gravity::OUTPUT_COUNT; i++) {
auto& ch = app.channel[i];
const auto& saved_ch_state = load_data.channel_data[i];
ch.setClockMod(saved_ch_state.base_clock_mod_index);
ch.setProbability(saved_ch_state.base_probability);
ch.setDutyCycle(saved_ch_state.base_duty_cycle);
ch.setOffset(saved_ch_state.base_offset);
ch.setSwing(saved_ch_state.base_swing);
ch.setSteps(saved_ch_state.base_euc_steps);
ch.setHits(saved_ch_state.base_euc_hits);
ch.setCv1Dest(static_cast<CvDestination>(saved_ch_state.cv1_dest));
ch.setCv2Dest(static_cast<CvDestination>(saved_ch_state.cv2_dest));
}
_loadState(app, slot_index);
return true;
}
@ -63,19 +37,19 @@ bool StateManager::loadData(AppState& app, byte slot_index) {
void StateManager::saveData(const AppState& app) {
if (app.selected_save_slot >= MAX_SAVE_SLOTS) return;
_save(app);
_saveState(app, app.selected_save_slot);
_isDirty = false;
}
void StateManager::update(const AppState& app) {
if (_isDirty && (millis() - _lastChangeTime > SAVE_DELAY_MS)) {
_save(app);
// MAX_SAVE_SLOTS slot is reserved for transient state.
_saveState(app, MAX_SAVE_SLOTS);
_isDirty = false;
}
}
void StateManager::reset(AppState& app) {
noInterrupts();
app.tempo = Clock::DEFAULT_TEMPO;
app.encoder_reversed = false;
app.selected_param = 0;
@ -88,9 +62,6 @@ void StateManager::reset(AppState& app) {
app.channel[i].Init();
}
// TODO: Should this overwrite save slot 0?
interrupts();
_isDirty = false;
}
@ -107,16 +78,10 @@ bool StateManager::_isDataValid() {
return name_match && version_match;
}
void StateManager::_save(const AppState& app) {
noInterrupts();
_saveState(app);
_saveMetadata(app.selected_save_slot);
interrupts();
}
void StateManager::_saveState(const AppState& app) {
void StateManager::_saveState(const AppState& app, byte slot_index) {
if (app.selected_save_slot >= MAX_SAVE_SLOTS) return;
noInterrupts();
static EepromData save_data;
save_data.tempo = app.tempo;
@ -141,14 +106,48 @@ void StateManager::_saveState(const AppState& app) {
save_ch.cv2_dest = static_cast<byte>(ch.getCv2Dest());
}
int address = EEPROM_DATA_START_ADDR + (app.selected_save_slot * sizeof(EepromData));
int address = EEPROM_DATA_START_ADDR + (slot_index * sizeof(EepromData));
EEPROM.put(address, save_data);
interrupts();
}
void StateManager::_saveMetadata(byte active_slot) {
void StateManager::_loadState(AppState& app, byte slot_index) {
noInterrupts();
static EepromData load_data;
int address = EEPROM_DATA_START_ADDR + (slot_index * sizeof(EepromData));
EEPROM.get(address, load_data);
// Restore app state from loaded data.
app.tempo = load_data.tempo;
app.encoder_reversed = load_data.encoder_reversed;
app.selected_param = load_data.selected_param;
app.selected_channel = load_data.selected_channel;
app.selected_source = static_cast<Clock::Source>(load_data.selected_source);
app.selected_pulse = static_cast<Clock::Pulse>(load_data.selected_pulse);
app.selected_save_slot = slot_index;
for (int i = 0; i < Gravity::OUTPUT_COUNT; i++) {
auto& ch = app.channel[i];
const auto& saved_ch_state = load_data.channel_data[i];
ch.setClockMod(saved_ch_state.base_clock_mod_index);
ch.setProbability(saved_ch_state.base_probability);
ch.setDutyCycle(saved_ch_state.base_duty_cycle);
ch.setOffset(saved_ch_state.base_offset);
ch.setSwing(saved_ch_state.base_swing);
ch.setSteps(saved_ch_state.base_euc_steps);
ch.setHits(saved_ch_state.base_euc_hits);
ch.setCv1Dest(static_cast<CvDestination>(saved_ch_state.cv1_dest));
ch.setCv2Dest(static_cast<CvDestination>(saved_ch_state.cv2_dest));
}
interrupts();
}
void StateManager::_saveMetadata() {
noInterrupts();
Metadata current_meta;
strcpy(current_meta.sketch_name, SKETCH_NAME);
current_meta.version = SKETCH_VERSION;
current_meta.active_slot = active_slot;
EEPROM.put(0, current_meta);
interrupts();
}

9
examples/Gravity/save_state.h
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@ -12,7 +12,7 @@ const char SKETCH_NAME[] = "Gravity";
const byte SKETCH_VERSION = 7;
// Number of available save slots.
const byte MAX_SAVE_SLOTS = 8;
const byte MAX_SAVE_SLOTS = 10;
// Define the minimum amount of time between EEPROM writes.
static const unsigned long SAVE_DELAY_MS = 2000;
@ -41,7 +41,6 @@ class StateManager {
// This struct holds the data that identifies the firmware version.
struct Metadata {
byte version;
byte active_slot;
char sketch_name[16];
};
struct ChannelState {
@ -68,9 +67,9 @@ class StateManager {
};
private:
bool _isDataValid();
void _save(const AppState& app);
void _saveState(const AppState& app);
void _saveMetadata(byte active_slot);
void _saveMetadata();
void _saveState(const AppState& app, byte slot_index);
void _loadState(AppState& app, byte slot_index);
bool _isDirty;
unsigned long _lastChangeTime;