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146 lines
2.2 KiB
146 lines
2.2 KiB
#include <Wire_slave.h>
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#define REGISTER_0 0x00
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#define REGISTER_1 0x01
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#define REGISTER_2 0x02
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#define REGISTER_3 0x03
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#define I2C_ADDRESS_SELF 0x4B
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unsigned int reg_0_value = 41151;
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unsigned int reg_1_value = 1;
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unsigned int reg_2_value = 2;
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unsigned int reg_3_value = 3;
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uint8_t master_reg; // I2C master read register
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uint8_t slave_reg; // I2C slave read register
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void setup()
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{
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Serial.begin(9600); //Begins Serial communication
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Serial.println("Setup for sensor");
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Wire.begin(I2C_ADDRESS_SELF); // join i2c bus
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// Wire.setClock(400000); // set I2C clock for full speed
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Serial.begin(9600); // start serial for output
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// digitalWrite(A4, LOW);
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// digitalWrite(A5, LOW);
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Wire.onRequest(requestEvent);
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Wire.onReceive(receiveEvent);
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pinMode(PC13, OUTPUT);
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Serial.println("Starting");
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}
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void loop()
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{
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delay(1000);
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Serial.println("Read sensor value");
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reg_0_value = 1; // set register 0 value to the sensor value
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reg_1_value += 1; // increment a count of how many values read
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}
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void receiveEvent(int bytes) {
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// Slave reads the first byte to determine which register is concerned
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slave_reg = Wire.read();
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Serial.print("Slave read register ");
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Serial.println(slave_reg);
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}
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void requestEvent() {
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// Slave uses the the register variable to know what to send back
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digitalWrite(PC13, HIGH);
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if (slave_reg == REGISTER_0) {
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Wire.write((uint8_t *)®_0_value, sizeof(reg_0_value));
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Serial.print("Slave writing value ");
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Serial.println(reg_0_value);
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} else if (slave_reg == REGISTER_1) {
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Wire.write((uint8_t *)®_1_value, sizeof(reg_1_value));
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Serial.print("Slave writing value ");
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Serial.println(reg_1_value);
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} else if (slave_reg == REGISTER_2) {
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Wire.write((uint8_t *)®_2_value, sizeof(reg_2_value));
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Serial.print("Slave writing value ");
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Serial.println(reg_2_value);
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} else if (slave_reg == REGISTER_3) {
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Wire.write((uint8_t *)®_3_value, sizeof(reg_3_value));
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Serial.print("Slave writing value ");
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Serial.println(reg_3_value);
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} else {
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Serial.println("Slave unknown register");
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}
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delay(50);
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digitalWrite(PC13, LOW);
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}
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