btclock_v3/src/lib/config.cpp

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No EOL
21 KiB
C++

#include "config.hpp"
#define MAX_ATTEMPTS_WIFI_CONNECTION 20
Preferences preferences;
Adafruit_MCP23X17 mcp1;
#ifdef IS_BTCLOCK_V8
Adafruit_MCP23X17 mcp2;
#endif
#ifdef HAS_FRONTLIGHT
PCA9685 flArray(PCA_I2C_ADDR);
BH1750 bh1750;
bool hasLuxSensor = false;
#endif
std::vector<ScreenMapping> screenMappings;
std::mutex mcpMutex;
uint lastTimeSync;
void addScreenMapping(int value, const char *name)
{
screenMappings.push_back({value, name});
}
void setup()
{
setupPreferences();
setupHardware();
setupDisplays();
if (preferences.getBool("ledTestOnPower", DEFAULT_LED_TEST_ON_POWER))
{
queueLedEffect(LED_POWER_TEST);
}
{
std::lock_guard<std::mutex> lockMcp(mcpMutex);
if (mcp1.digitalRead(3) == LOW)
{
preferences.putBool("wifiConfigured", false);
preferences.remove("txPower");
WiFi.eraseAP();
queueLedEffect(LED_EFFECT_WIFI_ERASE_SETTINGS);
}
}
{
if (mcp1.digitalRead(0) == LOW)
{
// Then loop forever to prevent anything else from writing to the screen
while (true)
{
delay(1000);
}
}
else if (mcp1.digitalRead(1) == LOW)
{
preferences.clear();
queueLedEffect(LED_EFFECT_WIFI_ERASE_SETTINGS);
nvs_flash_erase();
delay(1000);
ESP.restart();
}
}
setupWifi();
setupWebserver();
syncTime();
finishSetup();
setupTasks();
setupTimers();
if (preferences.getBool("useNostr", DEFAULT_USE_NOSTR) || preferences.getBool("nostrZapNotify", DEFAULT_ZAP_NOTIFY_ENABLED))
{
setupNostrNotify(preferences.getBool("useNostr", DEFAULT_USE_NOSTR), preferences.getBool("nostrZapNotify", DEFAULT_ZAP_NOTIFY_ENABLED));
setupNostrTask();
}
if (!preferences.getBool("useNostr", DEFAULT_USE_NOSTR))
{
xTaskCreate(setupWebsocketClients, "setupWebsocketClients", 8192, NULL,
tskIDLE_PRIORITY, NULL);
}
if (preferences.getBool("bitaxeEnabled", DEFAULT_BITAXE_ENABLED))
{
setupBitaxeFetchTask();
}
setupButtonTask();
setupOTA();
waitUntilNoneBusy();
#ifdef HAS_FRONTLIGHT
if (!preferences.getBool("flAlwaysOn", DEFAULT_FL_ALWAYS_ON))
{
frontlightFadeOutAll(preferences.getUInt("flEffectDelay"), true);
flArray.allOFF();
}
#endif
forceFullRefresh();
}
void setupWifi()
{
WiFi.onEvent(WiFiEvent);
WiFi.setAutoConnect(true);
WiFi.setAutoReconnect(true);
WiFi.begin();
if (preferences.getInt("txPower", DEFAULT_TX_POWER))
{
if (WiFi.setTxPower(
static_cast<wifi_power_t>(preferences.getInt("txPower", DEFAULT_TX_POWER))))
{
Serial.printf("WiFi max tx power set to %d\n",
preferences.getInt("txPower", DEFAULT_TX_POWER));
}
}
// if (!preferences.getBool("wifiConfigured", DEFAULT_WIFI_CONFIGURED)
{
queueLedEffect(LED_EFFECT_WIFI_WAIT_FOR_CONFIG);
bool buttonPress = false;
{
std::lock_guard<std::mutex> lockMcp(mcpMutex);
buttonPress = (mcp1.digitalRead(2) == LOW);
}
{
WiFiManager wm;
byte mac[6];
WiFi.macAddress(mac);
String softAP_SSID =
String("BTClock" + String(mac[5], 16) + String(mac[1], 16));
WiFi.setHostname(softAP_SSID.c_str());
String softAP_password = replaceAmbiguousChars(
base64::encode(String(mac[2], 16) + String(mac[4], 16) +
String(mac[5], 16) + String(mac[1], 16))
.substring(2, 10));
wm.setConfigPortalTimeout(preferences.getUInt("wpTimeout", DEFAULT_WP_TIMEOUT));
wm.setWiFiAutoReconnect(false);
wm.setDebugOutput(false);
wm.setConfigPortalBlocking(true);
wm.setAPCallback([&](WiFiManager *wifiManager)
{
// Serial.printf("Entered config mode:ip=%s, ssid='%s', pass='%s'\n",
// WiFi.softAPIP().toString().c_str(),
// wifiManager->getConfigPortalSSID().c_str(),
// softAP_password.c_str());
// delay(6000);
setFgColor(GxEPD_BLACK);
setBgColor(GxEPD_WHITE);
const String qrText = "qrWIFI:S:" + wifiManager->getConfigPortalSSID() +
";T:WPA;P:" + softAP_password.c_str() + ";;";
const String explainText = "*SSID: *\r\n" +
wifiManager->getConfigPortalSSID() +
"\r\n\r\n*Password:*\r\n" + softAP_password;
// Set the UNIX timestamp
time_t timestamp = LAST_BUILD_TIME; // Example timestamp: March 7, 2021 00:00:00 UTC
// Convert the timestamp to a struct tm in UTC
struct tm *timeinfo = gmtime(&timestamp);
// Format the date
char formattedDate[20];
strftime(formattedDate, sizeof(formattedDate), "%y-%m-%d\r\n%H:%M:%S", timeinfo);
std::array<String, NUM_SCREENS> epdContent = {
"Welcome!",
"Bienvenidos!",
"To setup\r\nscan QR or\r\nconnect\r\nmanually",
"Para\r\nconfigurar\r\nescanear QR\r\no conectar\r\nmanualmente",
explainText,
"*Hostname*:\r\n" + getMyHostname() + "\r\n\r\n" + "*FW build date:*\r\n" + formattedDate,
qrText};
setEpdContent(epdContent); });
wm.setSaveConfigCallback([]()
{
preferences.putBool("wifiConfigured", true);
delay(1000);
// just restart after succes
ESP.restart(); });
bool ac = wm.autoConnect(softAP_SSID.c_str(), softAP_password.c_str());
// waitUntilNoneBusy();
// std::array<String, NUM_SCREENS> epdContent = {"Welcome!",
// "Bienvenidos!", "Use\r\nweb-interface\r\nto configure", "Use\r\nla
// interfaz web\r\npara configurar", "Or
// restart\r\nwhile\r\nholding\r\n2nd button\r\r\nto start\r\n QR-config",
// "O reinicie\r\nmientras\r\n mantiene presionado\r\nel segundo
// botón\r\r\npara iniciar\r\nQR-config", ""}; setEpdContent(epdContent);
// esp_task_wdt_init(30, false);
// uint count = 0;
// while (WiFi.status() != WL_CONNECTED)
// {
// if (Serial.available() > 0)
// {
// uint8_t b = Serial.read();
// if (parse_improv_serial_byte(x_position, b, x_buffer,
// onImprovCommandCallback, onImprovErrorCallback))
// {
// x_buffer[x_position++] = b;
// }
// else
// {
// x_position = 0;
// }
// }
// count++;
// if (count > 2000000) {
// queueLedEffect(LED_EFFECT_HEARTBEAT);
// count = 0;
// }
// }
// esp_task_wdt_deinit();
// esp_task_wdt_reset();
}
setFgColor(preferences.getUInt("fgColor", isWhiteVersion() ? GxEPD_BLACK : GxEPD_WHITE));
setBgColor(preferences.getUInt("bgColor", isWhiteVersion() ? GxEPD_WHITE : GxEPD_BLACK));
}
// else
// {
// while (WiFi.status() != WL_CONNECTED)
// {
// vTaskDelay(pdMS_TO_TICKS(400));
// }
// }
// queueLedEffect(LED_EFFECT_WIFI_CONNECT_SUCCESS);
}
void syncTime()
{
configTime(preferences.getInt("gmtOffset", DEFAULT_TIME_OFFSET_SECONDS), 0,
NTP_SERVER);
struct tm timeinfo;
while (!getLocalTime(&timeinfo))
{
configTime(preferences.getInt("gmtOffset", DEFAULT_TIME_OFFSET_SECONDS), 0,
NTP_SERVER);
delay(500);
Serial.println(F("Retry set time"));
}
lastTimeSync = esp_timer_get_time() / 1000000;
}
void setupPreferences()
{
preferences.begin("btclock", false);
setFgColor(preferences.getUInt("fgColor", DEFAULT_FG_COLOR));
setBgColor(preferences.getUInt("bgColor", DEFAULT_BG_COLOR));
setBlockHeight(preferences.getUInt("blockHeight", INITIAL_BLOCK_HEIGHT));
setPrice(preferences.getUInt("lastPrice", INITIAL_LAST_PRICE), CURRENCY_USD);
if (preferences.getBool("ownDataSource", DEFAULT_OWN_DATA_SOURCE))
setCurrentCurrency(preferences.getUChar("lastCurrency", CURRENCY_USD));
else
setCurrentCurrency(CURRENCY_USD);
if (!preferences.isKey("flDisable")) {
preferences.putBool("flDisable", isWhiteVersion() ? false : true);
}
if (!preferences.isKey("fgColor")) {
preferences.putUInt("fgColor", isWhiteVersion() ? GxEPD_BLACK : GxEPD_WHITE);
preferences.putUInt("bgColor", isWhiteVersion() ? GxEPD_WHITE : GxEPD_BLACK);
}
addScreenMapping(SCREEN_BLOCK_HEIGHT, "Block Height");
addScreenMapping(SCREEN_TIME, "Time");
addScreenMapping(SCREEN_HALVING_COUNTDOWN, "Halving countdown");
addScreenMapping(SCREEN_BLOCK_FEE_RATE, "Block Fee Rate");
addScreenMapping(SCREEN_SATS_PER_CURRENCY, "Sats per dollar");
addScreenMapping(SCREEN_BTC_TICKER, "Ticker");
addScreenMapping(SCREEN_MARKET_CAP, "Market Cap");
// addScreenMapping(SCREEN_SATS_PER_CURRENCY_USD, "Sats per USD");
// addScreenMapping(SCREEN_BTC_TICKER_USD, "Ticker USD");
// addScreenMapping(SCREEN_MARKET_CAP_USD, "Market Cap USD");
// addScreenMapping(SCREEN_SATS_PER_CURRENCY_EUR, "Sats per EUR");
// addScreenMapping(SCREEN_BTC_TICKER_EUR, "Ticker EUR");
// addScreenMapping(SCREEN_MARKET_CAP_EUR, "Market Cap EUR");
// screenNameMap[SCREEN_BLOCK_HEIGHT] = "Block Height";
// screenNameMap[SCREEN_BLOCK_FEE_RATE] = "Block Fee Rate";
// screenNameMap[SCREEN_SATS_PER_CURRENCY] = "Sats per dollar";
// screenNameMap[SCREEN_BTC_TICKER] = "Ticker";
// screenNameMap[SCREEN_TIME] = "Time";
// screenNameMap[SCREEN_HALVING_COUNTDOWN] = "Halving countdown";
// screenNameMap[SCREEN_MARKET_CAP] = "Market Cap";
// addCurrencyMappings(getActiveCurrencies());
if (preferences.getBool("bitaxeEnabled", DEFAULT_BITAXE_ENABLED))
{
addScreenMapping(SCREEN_BITAXE_HASHRATE, "BitAxe Hashrate");
addScreenMapping(SCREEN_BITAXE_BESTDIFF, "BitAxe Best Difficulty");
}
}
String replaceAmbiguousChars(String input)
{
const char *ambiguous = "1IlO0";
const char *replacements = "LKQM8";
for (int i = 0; i < strlen(ambiguous); i++)
{
input.replace(ambiguous[i], replacements[i]);
}
return input;
}
// void addCurrencyMappings(const std::vector<std::string>& currencies)
// {
// for (const auto& currency : currencies)
// {
// int satsPerCurrencyScreen;
// int btcTickerScreen;
// int marketCapScreen;
// // Determine the corresponding screen IDs based on the currency code
// if (currency == "USD")
// {
// satsPerCurrencyScreen = SCREEN_SATS_PER_CURRENCY_USD;
// btcTickerScreen = SCREEN_BTC_TICKER_USD;
// marketCapScreen = SCREEN_MARKET_CAP_USD;
// }
// else if (currency == "EUR")
// {
// satsPerCurrencyScreen = SCREEN_SATS_PER_CURRENCY_EUR;
// btcTickerScreen = SCREEN_BTC_TICKER_EUR;
// marketCapScreen = SCREEN_MARKET_CAP_EUR;
// }
// else if (currency == "GBP")
// {
// satsPerCurrencyScreen = SCREEN_SATS_PER_CURRENCY_GBP;
// btcTickerScreen = SCREEN_BTC_TICKER_GBP;
// marketCapScreen = SCREEN_MARKET_CAP_GBP;
// }
// else if (currency == "JPY")
// {
// satsPerCurrencyScreen = SCREEN_SATS_PER_CURRENCY_JPY;
// btcTickerScreen = SCREEN_BTC_TICKER_JPY;
// marketCapScreen = SCREEN_MARKET_CAP_JPY;
// }
// else if (currency == "AUD")
// {
// satsPerCurrencyScreen = SCREEN_SATS_PER_CURRENCY_AUD;
// btcTickerScreen = SCREEN_BTC_TICKER_AUD;
// marketCapScreen = SCREEN_MARKET_CAP_AUD;
// }
// else if (currency == "CAD")
// {
// satsPerCurrencyScreen = SCREEN_SATS_PER_CURRENCY_CAD;
// btcTickerScreen = SCREEN_BTC_TICKER_CAD;
// marketCapScreen = SCREEN_MARKET_CAP_CAD;
// }
// else
// {
// continue; // Unknown currency, skip it
// }
// // Create the string locally to ensure it persists
// std::string satsPerCurrencyString = "Sats per " + currency;
// std::string btcTickerString = "Ticker " + currency;
// std::string marketCapString = "Market Cap " + currency;
// // Pass the c_str() to the function
// addScreenMapping(satsPerCurrencyScreen, satsPerCurrencyString.c_str());
// addScreenMapping(btcTickerScreen, btcTickerString.c_str());
// addScreenMapping(marketCapScreen, marketCapString.c_str());
// }
// }
void setupWebsocketClients(void *pvParameters)
{
if (preferences.getBool("ownDataSource", DEFAULT_OWN_DATA_SOURCE))
{
V2Notify::setupV2Notify();
}
else
{
setupBlockNotify();
setupPriceNotify();
}
vTaskDelete(NULL);
}
void setupTimers()
{
xTaskCreate(setupTimeUpdateTimer, "setupTimeUpdateTimer", 2048, NULL,
tskIDLE_PRIORITY, NULL);
xTaskCreate(setupScreenRotateTimer, "setupScreenRotateTimer", 2048, NULL,
tskIDLE_PRIORITY, NULL);
}
void finishSetup()
{
if (preferences.getBool("ledStatus", DEFAULT_LED_STATUS))
{
restoreLedState();
}
else
{
clearLeds();
}
}
std::vector<ScreenMapping> getScreenNameMap() { return screenMappings; }
void setupMcp()
{
#ifdef IS_BTCLOCK_V8
const int mcp1AddrPins[] = {MCP1_A0_PIN, MCP1_A1_PIN, MCP1_A2_PIN};
const int mcp1AddrValues[] = {LOW, LOW, LOW};
const int mcp2AddrPins[] = {MCP2_A0_PIN, MCP2_A1_PIN, MCP2_A2_PIN};
const int mcp2AddrValues[] = {HIGH, LOW, LOW};
pinMode(MCP_RESET_PIN, OUTPUT);
digitalWrite(MCP_RESET_PIN, HIGH);
for (int i = 0; i < 3; ++i)
{
pinMode(mcp1AddrPins[i], OUTPUT);
digitalWrite(mcp1AddrPins[i], mcp1AddrValues[i]);
pinMode(mcp2AddrPins[i], OUTPUT);
digitalWrite(mcp2AddrPins[i], mcp2AddrValues[i]);
}
digitalWrite(MCP_RESET_PIN, LOW);
delay(30);
digitalWrite(MCP_RESET_PIN, HIGH);
#endif
}
void setupHardware()
{
if (!LittleFS.begin(true))
{
Serial.println(F("An Error has occurred while mounting LittleFS"));
}
if (HW_REV == "REV_B_EPD_2_13" && !isWhiteVersion()) {
Serial.println(F("Black Rev B"));
}
if (!LittleFS.open("/index.html.gz", "r"))
{
Serial.println(F("Error loading WebUI"));
}
// if (!LittleFS.exists("/qr.txt"))
// {
// File f = LittleFS.open("/qr.txt", "w");
// if(f) {
// } else {
// Serial.println(F("Can't write QR to FS"));
// }
// }
setupLeds();
WiFi.setHostname(getMyHostname().c_str());
if (!psramInit())
{
Serial.println(F("PSRAM not available"));
}
setupMcp();
Wire.begin(I2C_SDA_PIN, I2C_SCK_PIN, 400000);
if (!mcp1.begin_I2C(0x20))
{
Serial.println(F("Error MCP23017 1"));
// while (1)
// ;
}
else
{
pinMode(MCP_INT_PIN, INPUT_PULLUP);
mcp1.setupInterrupts(false, false, LOW);
for (int i = 0; i < 4; i++)
{
mcp1.pinMode(i, INPUT_PULLUP);
mcp1.setupInterruptPin(i, LOW);
}
#ifndef IS_BTCLOCK_V8
for (int i = 8; i <= 14; i++)
{
mcp1.pinMode(i, OUTPUT);
}
#endif
}
#ifdef IS_HW_REV_B
pinMode(39, INPUT_PULLDOWN);
#endif
#ifdef IS_BTCLOCK_V8
if (!mcp2.begin_I2C(0x21))
{
Serial.println(F("Error MCP23017 2"));
// while (1)
// ;
}
#endif
#ifdef HAS_FRONTLIGHT
setupFrontlight();
Wire.beginTransmission(0x5C);
byte error = Wire.endTransmission();
if (error == 0)
{
Serial.println(F("Found BH1750"));
hasLuxSensor = true;
bh1750.begin(BH1750::CONTINUOUS_HIGH_RES_MODE, 0x5C);
}
else
{
Serial.println(F("BH1750 Not found"));
hasLuxSensor = false;
}
#endif
}
void WiFiEvent(WiFiEvent_t event, WiFiEventInfo_t info)
{
static bool first_connect = true;
Serial.printf("[WiFi-event] event: %d\n", event);
switch (event)
{
case ARDUINO_EVENT_WIFI_READY:
Serial.println(F("WiFi interface ready"));
break;
case ARDUINO_EVENT_WIFI_SCAN_DONE:
Serial.println(F("Completed scan for access points"));
break;
case ARDUINO_EVENT_WIFI_STA_START:
Serial.println(F("WiFi client started"));
break;
case ARDUINO_EVENT_WIFI_STA_STOP:
Serial.println(F("WiFi clients stopped"));
break;
case ARDUINO_EVENT_WIFI_STA_CONNECTED:
Serial.println(F("Connected to access point"));
break;
case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
{
if (!first_connect)
{
Serial.println(F("Disconnected from WiFi access point"));
queueLedEffect(LED_EFFECT_WIFI_CONNECT_ERROR);
uint8_t reason = info.wifi_sta_disconnected.reason;
if (reason)
Serial.printf("Disconnect reason: %s, ",
WiFi.disconnectReasonName((wifi_err_reason_t)reason));
}
break;
}
case ARDUINO_EVENT_WIFI_STA_AUTHMODE_CHANGE:
Serial.println(F("Authentication mode of access point has changed"));
break;
case ARDUINO_EVENT_WIFI_STA_GOT_IP:
{
Serial.print("Obtained IP address: ");
Serial.println(WiFi.localIP());
if (!first_connect)
queueLedEffect(LED_EFFECT_WIFI_CONNECT_SUCCESS);
first_connect = false;
break;
}
case ARDUINO_EVENT_WIFI_STA_LOST_IP:
Serial.println(F("Lost IP address and IP address is reset to 0"));
queueLedEffect(LED_EFFECT_WIFI_CONNECT_ERROR);
WiFi.reconnect();
break;
case ARDUINO_EVENT_WIFI_AP_START:
Serial.println(F("WiFi access point started"));
break;
case ARDUINO_EVENT_WIFI_AP_STOP:
Serial.println(F("WiFi access point stopped"));
break;
case ARDUINO_EVENT_WIFI_AP_STACONNECTED:
Serial.println(F("Client connected"));
break;
case ARDUINO_EVENT_WIFI_AP_STADISCONNECTED:
Serial.println(F("Client disconnected"));
break;
case ARDUINO_EVENT_WIFI_AP_STAIPASSIGNED:
Serial.println(F("Assigned IP address to client"));
break;
case ARDUINO_EVENT_WIFI_AP_PROBEREQRECVED:
Serial.println(F("Received probe request"));
break;
case ARDUINO_EVENT_WIFI_AP_GOT_IP6:
Serial.println(F("AP IPv6 is preferred"));
break;
case ARDUINO_EVENT_WIFI_STA_GOT_IP6:
Serial.println(F("STA IPv6 is preferred"));
break;
default:
break;
}
}
String getMyHostname()
{
uint8_t mac[6];
// WiFi.macAddress(mac);
esp_efuse_mac_get_default(mac);
char hostname[15];
String hostnamePrefix = preferences.getString("hostnamePrefix", DEFAULT_HOSTNAME_PREFIX);
snprintf(hostname, sizeof(hostname), "%s-%02x%02x%02x", hostnamePrefix,
mac[3], mac[4], mac[5]);
return hostname;
}
uint getLastTimeSync()
{
return lastTimeSync;
}
#ifdef HAS_FRONTLIGHT
void setupFrontlight()
{
if (!flArray.begin(PCA9685_MODE1_AUTOINCR | PCA9685_MODE1_ALLCALL, PCA9685_MODE2_TOTEMPOLE))
{
Serial.println(F("FL driver error"));
return;
}
Serial.println(F("FL driver active"));
if (!preferences.isKey("flMaxBrightness"))
{
preferences.putUInt("flMaxBrightness", DEFAULT_FL_MAX_BRIGHTNESS);
}
if (!preferences.isKey("flEffectDelay"))
{
preferences.putUInt("flEffectDelay", DEFAULT_FL_EFFECT_DELAY);
}
if (!preferences.isKey("flFlashOnUpd"))
{
preferences.putBool("flFlashOnUpd", DEFAULT_FL_FLASH_ON_UPDATE);
}
}
float getLightLevel()
{
return bh1750.readLightLevel();
}
bool hasLightLevel()
{
return hasLuxSensor;
}
#endif
String getHwRev()
{
#ifndef HW_REV
return "REV_0";
#else
return HW_REV;
#endif
}
bool isWhiteVersion()
{
#ifdef IS_HW_REV_B
pinMode(39, INPUT_PULLDOWN);
return digitalRead(39);
#else
return false;
#endif
}
String getFsRev()
{
File fsHash = LittleFS.open("/fs_hash.txt", "r");
if (!fsHash)
{
Serial.println(F("Error loading WebUI"));
}
String ret = fsHash.readString();
fsHash.close();
return ret;
}
int findScreenIndexByValue(int value)
{
for (int i = 0; i < screenMappings.size(); i++)
{
if (screenMappings[i].value == value)
{
return i;
}
}
return -1; // Return -1 if value is not found
}
std::vector<std::string> getAvailableCurrencies()
{
return {CURRENCY_CODE_USD, CURRENCY_CODE_EUR, CURRENCY_CODE_GBP, CURRENCY_CODE_JPY, CURRENCY_CODE_AUD, CURRENCY_CODE_CAD};
}
std::vector<std::string> getActiveCurrencies()
{
std::vector<std::string> result;
// Convert Arduino String to std::string
std::string stdString = preferences.getString("actCurrencies", DEFAULT_ACTIVE_CURRENCIES).c_str();
// Use a stringstream to split the string
std::stringstream ss(stdString);
std::string item;
// Split the string by comma and add each part to the vector
while (std::getline(ss, item, ','))
{
result.push_back(item);
}
return result;
}
bool isActiveCurrency(std::string &currency)
{
std::vector<std::string> ac = getActiveCurrencies();
if (std::find(ac.begin(), ac.end(), currency) != ac.end())
{
return true;
}
return false;
}
const char* getFirmwareFilename() {
if (HW_REV == "REV_B_EPD_2_13") {
return "btclock_rev_b_213epd_firmware.bin";
} else if (HW_REV == "REV_A_EPD_2_13") {
return "lolin_s3_mini_213epd_firmware.bin";
} else if (HW_REV == "REV_A_EPD_2_9") {
return "lolin_s3_mini_29epd_firmware.bin";
} else {
return "";
}
}