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