Modify the code

examples/Master/Master.ino

@@ -1,55 +1,121 @@
 #include <Wire.h>
 
-#define I2C_DEV_ADDR 0x55  // Must match slave
+#define SLAVE_ADDRESS 0x08
 
 void setup() {
   Serial.begin(115200);
-  Wire.begin(); // default pins for ESP32-C3: SDA=8, SCL=9
-  Serial.println("Enter number of pixels:");
+  Wire.begin();
+
+  delay(1000);
+  Serial.println("Testing I2C LED Strip Slave...");
+
+  // 1. Set device name (optional, not in slave code above, but included for completeness)
+  // setDeviceName("LivingRoomLEDs");
+
+  // 2. Set number of LEDs to 10 (for testing)
+  setLedCount(10);
+  delay(200);
+
+  // 3. Set brightness to 128 (half)
+  setBrightness(128);
+  delay(200);
+
+  // 4. Set all pixels to red
+  setAllPixels(255, 0, 0);
+  delay(1000);
+
+  // 5. Set pixel 0 to green
+  setPixel(0, 0, 255, 0);
+  delay(500);
+
+  // 6. Set pixel 1 to blue
+  setPixel(1, 0, 0, 255);
+  delay(500);
+
+  // 7. Set all pixels to white
+  setAllPixels(255, 255, 255);
+  delay(1000);
+
+  // 8. Clear all pixels (turn off)
+  clearAll();
+  delay(500);
+
+  // 9. Request status from slave and print it
+  requestStatus();
+
+  Serial.println("Test complete.");
 }
 
 void loop() {
-  static int numPixels = 0;
-  static bool pixelsSet = false;
-
-  // Step 1: Get number of pixels from user
-  if (!pixelsSet && Serial.available()) {
-    numPixels = Serial.parseInt();
-    if (numPixels > 0 && numPixels <= 100) { // reasonable limit
-      Wire.beginTransmission(I2C_DEV_ADDR);
-      Wire.write(0x01); // Command: set pixel count
-      Wire.write(numPixels);
-      Wire.endTransmission();
-      pixelsSet = true;
-      Serial.println("Enter command: (example: ALL 255 0 0 128) or (PIXEL 3 0 255 0 255)");
-      Serial.println("Format:");
-      Serial.println("ALL R G B I");
-      Serial.println("PIXEL N R G B I");
-    } else {
-      Serial.println("Invalid pixel count. Try again.");
-    }
-  }
-
-  // Step 2: Get lighting commands from user
-  if (pixelsSet && Serial.available()) {
-    String cmd = Serial.readStringUntil('\n');
-    cmd.trim();
-
-    if (cmd.startsWith("ALL")) {
-      int r, g, b, i;
-      sscanf(cmd.c_str(), "ALL %d %d %d %d", &r, &g, &b, &i);
-      Wire.beginTransmission(I2C_DEV_ADDR);
-      Wire.write(0x02); // Command: set all pixels
-      Wire.write(r); Wire.write(g); Wire.write(b); Wire.write(i);
-      Wire.endTransmission();
-    } else if (cmd.startsWith("PIXEL")) {
-      int n, r, g, b, i;
-      sscanf(cmd.c_str(), "PIXEL %d %d %d %d %d", &n, &r, &g, &b, &i);
-      Wire.beginTransmission(I2C_DEV_ADDR);
-      Wire.write(0x03); // Command: set one pixel
-      Wire.write(n); Wire.write(r); Wire.write(g); Wire.write(b); Wire.write(i);
-      Wire.endTransmission();
-    }
-    Serial.println("Command sent.");
-  }
+  // Nothing here
+}
+
+// --------- Helper Functions ---------
+
+void setPixel(uint8_t pixel, uint8_t r, uint8_t g, uint8_t b) {
+  Wire.beginTransmission(SLAVE_ADDRESS);
+  Wire.write(0xA0); // Command: Set individual pixel
+  Wire.write(pixel);
+  Wire.write(r);
+  Wire.write(g);
+  Wire.write(b);
+  Wire.endTransmission();
+  Serial.print("Set pixel "); Serial.print(pixel);
+  Serial.print(" to RGB("); Serial.print(r); Serial.print(","); Serial.print(g); Serial.print(","); Serial.print(b); Serial.println(")");
+}
+
+void setAllPixels(uint8_t r, uint8_t g, uint8_t b) {
+  Wire.beginTransmission(SLAVE_ADDRESS);
+  Wire.write(0xA1); // Command: Set all pixels
+  Wire.write(r);
+  Wire.write(g);
+  Wire.write(b);
+  Wire.endTransmission();
+  Serial.print("Set all pixels to RGB("); Serial.print(r); Serial.print(","); Serial.print(g); Serial.print(","); Serial.print(b); Serial.println(")");
+}
+
+void setBrightness(uint8_t brightness) {
+  Wire.beginTransmission(SLAVE_ADDRESS);
+  Wire.write(0xA2); // Command: Set brightness
+  Wire.write(brightness);
+  Wire.endTransmission();
+  Serial.print("Set brightness to "); Serial.println(brightness);
+}
+
+void clearAll() {
+  Wire.beginTransmission(SLAVE_ADDRESS);
+  Wire.write(0xB0); // Command: Clear all
+  Wire.endTransmission();
+  Serial.println("Cleared all pixels (off)");
+}
+
+void setLedCount(uint16_t count) {
+  Wire.beginTransmission(SLAVE_ADDRESS);
+  Wire.write(0xD0); // Command: Set LED count
+  Wire.write((count >> 8) & 0xFF); // High byte
+  Wire.write(count & 0xFF);        // Low byte
+  Wire.endTransmission();
+  Serial.print("Set LED count to "); Serial.println(count);
+}
+
+// Optional: Set device name (if supported in slave code)
+void setDeviceName(const char* name) {
+  Wire.beginTransmission(SLAVE_ADDRESS);
+  Wire.write(0xD0); // Command: Set device name
+  for (uint8_t i = 0; i < strlen(name); i++) {
+    Wire.write(name[i]);
+  }
+  Wire.endTransmission();
+  Serial.print("Set device name to "); Serial.println(name);
+}
+
+void requestStatus() {
+  Wire.requestFrom(SLAVE_ADDRESS, 40); // Request up to 40 bytes (enough for status string)
+  String status = "";
+  while (Wire.available()) {
+    char c = Wire.read();
+    status += c;
+  }
+  Serial.print("Status from slave: ");
+  Serial.println(status);
 }