commit 4550077e564b9b2b6332b7560a64ee4d084ce0a1
Author: Dooho Yi <pilotedeguerre@gmail.com>
Date:   Tue May 16 11:45:01 2023 +0900

    init

diff --git a/cfirmata_8266.ino b/cfirmata_8266.ino
new file mode 100644
index 0000000..6972053
--- /dev/null
+++ b/cfirmata_8266.ino
@@ -0,0 +1,183 @@
+//
+// ringringrain - WIFI part. (esp8266)
+//
+// D. Yi @ 2023 5 5
+//
+
+//wi-fi
+#include <ESP8266WiFi.h>
+
+////network!
+const char* ssid     = "esp0";
+const char* password = "1111100000";
+const int NETWORK_PORT = 27016;
+// IPAddress local_IP(192, 168, 137, 111);
+// IPAddress gateway(192, 168, 137, 1);
+// IPAddress subnet(255, 255, 255, 0);
+
+//wi-fi event handlers : re-connect automatically
+WiFiEventHandler wifiConnectHandler;
+WiFiEventHandler wifiDisconnectHandler;
+void onWifiConnect(const WiFiEventStationModeGotIP& event) {
+  Serial.println("Connected to Wi-Fi sucessfully.");
+  Serial.print("IP address: ");
+  Serial.println("Mac address: " + WiFi.macAddress());
+  Serial.println(WiFi.localIP());
+  digitalWrite(2, HIGH);
+}
+
+void onWifiDisconnect(const WiFiEventStationModeDisconnected& event) {
+  Serial.println("Disconnected from Wi-Fi, trying to reconnect...");
+  WiFi.disconnect();
+  WiFi.begin(ssid, password);
+  digitalWrite(2, LOW);
+}
+
+//firmata over wi-fi
+#include <ConfigurableFirmata.h>
+#include "utility/WiFiClientStream.h"
+#include "utility/WiFiServerStream.h"
+WiFiServerStream serverStream(NETWORK_PORT);
+
+//firmware update over the air
+#include <ArduinoOTA.h>
+
+//handle digitalWrite
+byte previousPORT[TOTAL_PORTS];
+void digitalWriteCallback(byte port, int value)
+{
+  byte i;
+  byte currentPinValue, previousPinValue;
+
+  if (port < TOTAL_PORTS && value != previousPORT[port]) {
+    for (i = 0; i < 8; i++) {
+      currentPinValue = (byte) value & (1 << i);
+      previousPinValue = previousPORT[port] & (1 << i);
+      if (currentPinValue != previousPinValue) {
+        digitalWrite(i + (port * 8), currentPinValue);
+      }
+    }
+    previousPORT[port] = value;
+  }
+}
+
+////
+void setup()
+{
+  //pinmodes
+  //digital inputs
+  pinMode(D1, INPUT_PULLUP);
+  pinMode(D2, INPUT_PULLUP);
+  pinMode(D3, INPUT_PULLUP);
+  pinMode(D5, INPUT_PULLUP);
+  pinMode(D6, INPUT_PULLUP);
+  pinMode(D7, INPUT_PULLUP);
+
+  //digital outputs
+  pinMode(D4, OUTPUT);    //build-in LED && also used as wifi indicator!
+  digitalWrite(D4, LOW);  //LOW ==> LED ON ==> 'wifi. disconnected.'
+
+  //serial (for debug & info)
+  Serial.begin(115200);
+
+  //wifi
+  wifiConnectHandler = WiFi.onStationModeGotIP(onWifiConnect);
+  wifiDisconnectHandler = WiFi.onStationModeDisconnected(onWifiDisconnect);
+  WiFi.mode(WIFI_STA);
+  // Connect to WiFi network
+  Serial.println();
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+  // if (!WiFi.config(local_IP, gateway, subnet)) {
+  //   Serial.println("STA Failed to configure");
+  // }
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    // Serial.print(".");
+    delay(500);
+  }
+  Serial.println("");
+
+  //firmata
+  Firmata.disableBlinkVersion();
+  Firmata.attach(DIGITAL_MESSAGE, digitalWriteCallback);
+  Firmata.begin(serverStream);
+
+  //ota
+  ArduinoOTA.onStart([]() {
+    Serial.println("Start");
+  });
+  ArduinoOTA.onEnd([]() {
+    Serial.println("\nEnd");
+  });
+  ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
+    Serial.printf("Progress: %u%%\r", (progress / (total / 100)));
+  });
+  ArduinoOTA.onError([](ota_error_t error) {
+    Serial.printf("Error[%u]: ", error);
+    if (error == OTA_AUTH_ERROR) Serial.println("Auth Failed");
+    else if (error == OTA_BEGIN_ERROR) Serial.println("Begin Failed");
+    else if (error == OTA_CONNECT_ERROR) Serial.println("Connect Failed");
+    else if (error == OTA_RECEIVE_ERROR) Serial.println("Receive Failed");
+    else if (error == OTA_END_ERROR) Serial.println("End Failed");
+  });
+  ArduinoOTA.begin();
+}
+
+void loop()
+{
+  // loop frequency = 50hz (20 ms)
+  static unsigned long last = 0;
+  unsigned long now = millis();
+  if (now > last + 20) {
+    last = now;
+
+    //
+    static int counter = 0;
+    counter++;
+    if (counter == 1000) counter = 0;
+
+    //digital
+    //==> https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/
+    byte port = 0;
+
+    static byte port0_prev = 0;
+    port = 0x00;
+    port |= (0 ? 0x01 : 0x00); // EXCLUDED ==> no interrupt.. let's just leave it.
+    port |= (digitalRead(D1) ? 0x02 : 0x00);
+    port |= (digitalRead(D2) ? 0x04 : 0x00);
+    port |= (digitalRead(D3) ? 0x08 : 0x00); // by design, PULLED-UP, being used for the FLASH button.
+    port |= (0 ? 0x10 : 0x00); // EXCLUDED ==> LED output
+    port |= (digitalRead(D5) ? 0x20 : 0x00);
+    port |= (digitalRead(D6) ? 0x40 : 0x00);
+    port |= (digitalRead(D7) ? 0x80 : 0x00);
+    if (port0_prev != port) Firmata.sendDigitalPort(0, port);
+    port0_prev = port;
+
+    //analog 0
+    Firmata.sendAnalog(0, analogRead(0));
+
+    //send out alive counter every 1sec. (50 counts x 20ms == 1 sec.)
+    if (counter % 50 == 0) {
+      static int alivecounter = 0;
+      Firmata.sendAnalog(1, alivecounter);
+      alivecounter++;
+      if (alivecounter == 1000) alivecounter = 0;
+    }
+  }
+
+  //process firmata stream
+  while (Firmata.available()) {
+    Firmata.processInput();
+  }
+
+  //firmata over wi-fi
+  serverStream.maintain();
+
+  //
+  ArduinoOTA.handle();
+
+  //for wdt
+  yield();
+}