Arduino I2C地址扫描程序

本程序扫描从0-127的全部I2C地址，扫描数据从串口输出，扫描完成，13脚灯会闪动三次：#include "Wire.h"
extern "C" {
#include "utility/twi.h"// from Wire library, so we can do bus scanning
}

byte start_address = 1;
byte end_address = 127;

// Scan the I2C bus between addresses from_addr and to_addr.
// On each address, call the callback function with the address and result.
// If result==0, address was found, otherwise, address wasn't found
// (can use result to potentially get other status on the I2C bus, see twi.c)
// Assumes Wire.begin() has already been called
void scanI2CBus(byte from_addr, byte to_addr,
void(*callback)(byte address, byte result) )
{
byte rc;
byte data = 0; // not used, just an address to feed to twi_writeTo()
for( byte addr = from_addr; addr <= to_addr; addr++ ) {
rc = twi_writeTo(addr, &data, 0, 1);
if(rc==0) callback( addr, rc );
}
}

// Called when address is found in scanI2CBus()
// Feel free to change this as needed
// (like adding I2C comm code to figure out what kind of I2C device is there)
void scanFunc( byte addr, byte result ) {
Serial.print("addr: ");
Serial.print(addr,DEC);
addr = addr<<1;
Serial.print("\t HEX: 0x");
Serial.print(addr,HEX);
Serial.println( (result==0) ? "\t found!":" ");
//Serial.print( (addr%4) ? "\t":"\n");
}

// standard Arduino setup()
void setup()
{
pinMode(13,OUTPUT);
Wire.begin();

Serial.begin(9600);
Serial.println("--- I2C Bus Scanner Test ---");
Serial.print("starting scanning of I2C bus from ");
Serial.print(start_address,DEC);
Serial.print(" to ");
Serial.print(end_address,DEC);
Serial.println("...");
Serial.println();

// start the scan, will call "scanFunc()" on result from each address
scanI2CBus( start_address, end_address, scanFunc );

Serial.print("\n");
Serial.println("--- I2C Bus Scanner Complete ---");

digitalWrite(13,HIGH); delay(500); digitalWrite(13,LOW); delay(500);
digitalWrite(13,HIGH); delay(500); digitalWrite(13,LOW); delay(500);
digitalWrite(13,HIGH); delay(500); digitalWrite(13,LOW); delay(500);
}

void loop()
{
}
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