ES ordening

ES/ES assignment 4/ES assignment 3 I2C/Assignment-D/Slave.cpp

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+#include <Arduino.h>
+#include <Wire.h>
+
+#define SLAVE_ADDRESS 0x77
+
+uint8_t registers[256] = {0}; // Simuleer registermap
+uint8_t regAddr = 0;           // Registeradres voor read/write
+
+void setup() {
+  Wire.begin(SLAVE_ADDRESS);
+  Wire.onReceive(receiveEvent);
+  Wire.onRequest(requestEvent);
+  Serial.begin(9600);
+  Serial.println("Slave ready.");
+}
+
+void loop() {
+}
+
+// Ontvangen van master (write)
+void receiveEvent(int howMany) {
+  if (howMany < 1) return;
+
+  regAddr = Wire.read(); // Eerste byte is altijd registeradres
+
+  if (howMany > 1) {
+    // Daarna komen data bytes
+    int bytesToRead = howMany - 1;
+    for (int i = 0; i < bytesToRead; i++) {
+      if (Wire.available()) {
+        uint8_t val = Wire.read();
+        registers[regAddr + i] = val;
+        Serial.print("Reg ");
+        Serial.print(regAddr + i);
+        Serial.print(" written with ");
+        Serial.println(val);
+      }
+    }
+
+    // Update min/max registers als 0x21 of 0x22 is gewijzigd
+    if (regAddr == 0x21 || regAddr == 0x22) {
+      uint8_t a = registers[0x21];
+      uint8_t b = registers[0x22];
+      registers[0x23] = (a < b) ? a : b; // MIN
+      registers[0x24] = (a > b) ? a : b; // MAX
+
+      Serial.print("Updated MIN (0x23): ");
+      Serial.println(registers[0x23]);
+      Serial.print("Updated MAX (0x24): ");
+      Serial.println(registers[0x24]);
+    }
+  }
+  // else alleen registeradres ontvangen, niks schrijven (read setup)
+}
+
+// Master vraagt data op (read)
+void requestEvent() {
+  uint8_t val = registers[regAddr];
+  Wire.write(val);
+
+  Serial.print("Sent reg ");
+  Serial.print(regAddr, HEX);
+  Serial.print(": ");
+  Serial.println(val);
+}