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ESP32_SerialLogger.ino
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190
ESP32_SerialLogger.ino
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// ============================================================
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// ESP32 Serial Logger
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// Hardware: ESP-WROOM-32D DevKitC V4
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//
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// Arduino IDE Settings:
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// Board: "ESP32 Dev Module"
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// Upload Speed: 921600
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// CPU Frequency: 240MHz (WiFi/BT)
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// Flash Frequency: 80MHz
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// Flash Mode: QIO
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// Flash Size: 4MB (32Mb)
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// Partition Scheme: "Huge APP (3MB No OTA/1MB SPIFFS)"
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// PSRAM: Disabled
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//
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// Required Libraries:
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// 1. WebSocketsServer by Links2004
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// (Install: Library Manager -> "WebSockets" by Markus Sattler)
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// 2. ArduinoJson by Benoit Blanchon v6.x
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// (Install: Library Manager -> "ArduinoJson")
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// 3. SD (built-in)
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// 4. SPI (built-in)
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//
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// Pin Assignments:
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// UART2 TX: GPIO17 | UART2 RX: GPIO16
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// SD CLK: GPIO14 | SD MISO: GPIO26 | SD MOSI: GPIO13 | SD CS: GPIO15
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// ============================================================
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#include <Arduino.h>
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#include <WiFi.h>
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#include <esp_wifi.h>
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#include <WebServer.h>
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#include <WebSocketsServer.h>
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#include <ArduinoJson.h>
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#include <SPI.h>
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#include <SD.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#include <freertos/queue.h>
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#include <freertos/semphr.h>
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#include <sys/time.h>
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#include <time.h>
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#include "config.h"
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#include "serial_task.h"
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#include "sdcard_task.h"
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#include "web_task.h"
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// ============================================================
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// NTP Time Sync Task
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// Only works in STA mode (internet required)
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// In AP mode, time is synced from browser via WebSocket
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// ============================================================
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void ntpSyncTask(void *param) {
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Serial.println("[Task] NTP Sync started");
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// Only attempt NTP if connected to external WiFi (STA mode)
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if (WiFi.getMode() == WIFI_AP) {
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Serial.println("[NTP] AP mode - skipping NTP, waiting for browser time sync");
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// In AP mode, just keep task alive for potential future use
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while (true) {
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vTaskDelay(pdMS_TO_TICKS(60000));
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}
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}
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// STA mode - try NTP
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configTime(NTP_GMT_OFFSET, NTP_DAYLIGHT_OFFSET, NTP_SERVER);
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struct tm timeinfo;
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int retries = 0;
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while (!getLocalTime(&timeinfo) && retries < 5) {
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Serial.println("[NTP] Waiting for time sync...");
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vTaskDelay(pdMS_TO_TICKS(1000));
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retries++;
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}
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if (getLocalTime(&timeinfo)) {
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Serial.printf("[NTP] Synced: %04d-%02d-%02d %02d:%02d:%02d\n",
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timeinfo.tm_year + 1900, timeinfo.tm_mon + 1, timeinfo.tm_mday,
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timeinfo.tm_hour, timeinfo.tm_min, timeinfo.tm_sec);
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} else {
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Serial.println("[NTP] Failed - will use browser time when client connects");
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}
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// Periodic re-sync every 1 hour
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while (true) {
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vTaskDelay(pdMS_TO_TICKS(3600000));
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configTime(NTP_GMT_OFFSET, NTP_DAYLIGHT_OFFSET, NTP_SERVER);
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Serial.println("[NTP] Time re-synced");
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}
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}
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// ============================================================
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// WiFi Connection (STA + fallback AP mode)
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// ============================================================
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void wifiConnect() {
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Serial.println("[WiFi] Connecting to: " + String(WIFI_SSID));
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WiFi.mode(WIFI_STA);
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WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
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WiFi.setSleep(false);
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unsigned long startTime = millis();
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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if (millis() - startTime > WIFI_CONNECT_TIMEOUT) {
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Serial.println("\n[WiFi] STA failed! Starting AP mode...");
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WiFi.mode(WIFI_AP);
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WiFi.softAP(WIFI_AP_SSID, WIFI_AP_PASSWORD);
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Serial.println("[WiFi] AP SSID: " + String(WIFI_AP_SSID));
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Serial.println("[WiFi] AP IP: " + WiFi.softAPIP().toString());
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return;
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}
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}
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Serial.println();
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Serial.println("[WiFi] Connected! IP: " + WiFi.localIP().toString());
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Serial.println("[WiFi] RSSI: " + String(WiFi.RSSI()) + " dBm");
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}
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// ============================================================
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// Setup
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// ============================================================
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void setup() {
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Serial.begin(115200);
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delay(1000);
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Serial.println("============================================");
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Serial.println(" ESP32 Serial Logger v1.0");
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Serial.println(" ESP-WROOM-32D DevKitC V4");
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Serial.println("============================================");
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Serial.printf(" Free Heap: %d bytes\n", ESP.getFreeHeap());
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Serial.printf(" CPU Freq: %d MHz\n", getCpuFrequencyMhz());
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Serial.println("============================================");
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// 1. WiFi
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wifiConnect();
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// 2. NTP (STA mode only) + Browser time sync (AP mode)
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xTaskCreatePinnedToCore(ntpSyncTask, "NTP", TASK_STACK_NTP,
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NULL, TASK_PRIORITY_NTP, NULL, 0);
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if (WiFi.getMode() != WIFI_AP) {
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delay(2000); // Brief wait for NTP only in STA mode
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} else {
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Serial.println("[Time] AP mode: time will sync from browser on first connect");
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}
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// 3. SD Card
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sdTaskInit();
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// 4. Serial2 UART
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serialTaskInit();
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// 5. Web Server + WebSocket
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webTaskInit();
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Serial.println("============================================");
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Serial.println(" All tasks started!");
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Serial.printf(" Free Heap: %d bytes\n", ESP.getFreeHeap());
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String ip = (WiFi.getMode() == WIFI_AP) ?
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WiFi.softAPIP().toString() : WiFi.localIP().toString();
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Serial.println(" URL: http://" + ip);
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Serial.println("============================================");
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Serial.println("\n Task Layout:");
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Serial.println(" Core 1: SerialRX(5), SerialTX(4)");
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Serial.println(" Core 0: SDLog(3), WebBC(2), NTP(1)");
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Serial.println(" Loop : server.handleClient()");
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Serial.println(" Time : NTP(STA) or Browser sync(AP)");
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Serial.println("============================================\n");
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}
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// ============================================================
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// Loop - handles HTTP requests (must be on main loop)
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// ============================================================
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void loop() {
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server.handleClient();
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vTaskDelay(pdMS_TO_TICKS(2));
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// Periodic status report (30s)
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static unsigned long lastReport = 0;
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if (millis() - lastReport > 30000) {
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lastReport = millis();
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Serial.printf("[SYS] Heap: %d | MinHeap: %d | SD: %s | WS: %d clients\n",
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ESP.getFreeHeap(),
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ESP.getMinFreeHeap(),
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sdCardPresent() ? "OK" : "FAIL",
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webSocket.connectedClients());
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}
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}
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