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   1 #include <Wire.h>
   2
   3 #define MASTER_INT_PIN  A2
   4 #define INT_PIN 3
   5 #define SW0_PIN 7
   6 #define SW1_PIN 6
   7 #define SW2_PIN 5
   8 #define SW3_PIN 4
   9
  10 #define SLAVE_ADDRESS   0x09
  11
  12 void i2c_send_handler(void);
  13 void button_handler(void);
  14
  15 volatile uint8_t dip_sw = 0;
  16 volatile bool new_data = false;
  17
  18 void setup()
  19 {
  20         pinMode(MASTER_INT_PIN, OUTPUT);
  21         digitalWrite(MASTER_INT_PIN, LOW);
  22         pinMode(INT_PIN, INPUT_PULLUP);
  23         pinMode(SW0_PIN, INPUT_PULLUP);
  24         pinMode(SW1_PIN, INPUT_PULLUP);
  25         pinMode(SW2_PIN, INPUT_PULLUP);
  26         pinMode(SW3_PIN, INPUT_PULLUP);
  27
  28         attachInterrupt(digitalPinToInterrupt(INT_PIN), button_handler, FALLING);
  29
  30         Wire.begin(SLAVE_ADDRESS);
  31         Wire.onRequest(i2c_send_handler);
  32
  33         Serial.begin(9600);
  34 }
  35
  36 void loop()
  37 {
  38         uint8_t tmp = digitalRead(SW0_PIN) |
  39                                  (digitalRead(SW1_PIN) << 1) |
  40                                  (digitalRead(SW2_PIN) << 2) |
  41                                  (digitalRead(SW3_PIN) << 3);
  42         dip_sw = tmp;
  43         if (new_data)
  44         {
  45                 new_data = false;
  46                 digitalWrite(MASTER_INT_PIN, HIGH);
  47                 delayMicroseconds(5);
  48                 digitalWrite(MASTER_INT_PIN, LOW);
  49                 delayMicroseconds(5);
  50         }
  51 }
  52
  53 void i2c_send_handler(void)
  54 {
  55         Wire.write((uint8_t *) &dip_sw, sizeof(dip_sw));
  56 }
  57
  58 void button_handler(void)
  59 {
  60         new_data = true;
  61 }