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42 lines
1.1 KiB
42 lines
1.1 KiB
4 years ago
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// Wire Slave Receiver
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// by devyte
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// based on the example by Nicholas Zambetti <http://www.zambetti.com>
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// Demonstrates use of the Wire library
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// Receives data as an I2C/TWI slave device
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// Refer to the "Wire Master Writer" example for use with this
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// This example code is in the public domain.
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#include <Wire.h>
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#define SDA_PIN 4
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#define SCL_PIN 5
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const int16_t I2C_MASTER = 0x42;
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const int16_t I2C_SLAVE = 0x08;
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void setup() {
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Serial.begin(115200); // start serial for output
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Wire.begin(SDA_PIN, SCL_PIN, I2C_SLAVE); // new syntax: join i2c bus (address required for slave)
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Wire.onReceive(receiveEvent); // register event
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}
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void loop() {
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}
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// function that executes whenever data is received from master
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// this function is registered as an event, see setup()
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void receiveEvent(size_t howMany) {
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(void) howMany;
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while (1 < Wire.available()) { // loop through all but the last
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char c = Wire.read(); // receive byte as a character
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Serial.print(c); // print the character
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}
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int x = Wire.read(); // receive byte as an integer
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Serial.println(x); // print the integer
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}
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