M5Stack Core2: i2c のスキャン

プログラム

i2c_scanner.ino

// ---------------------------------------------------------------------
//	i2c_scanner.ino for M5StackCore2
//
//						Aug/28/2024
// ---------------------------------------------------------------------
#include <Wire.h>
#define	PROGRAM	"i2c_scanner.ino"
#define	VERSION	"2024-8-28 AM 09:59"

// ---------------------------------------------------------------------
void setup()
{
	Wire.begin();
	Serial.begin(115200);
	delay(1000);
	Serial.println(PROGRAM);
	Serial.println(VERSION);
	Serial.println();
	delay(1000);
	Serial.println(PROGRAM);
	Serial.println(VERSION);
	delay(1000);
	Serial.println("*** setup end ***");
}

// ---------------------------------------------------------------------
void loop()
{
	byte error, address;
	int nDevices;

	Serial.println("Scanning...");

	nDevices = 0;
	for(address = 1; address < 127; address++ ) 
	{
		// The i2c_scanner uses the return value of
		// the Write.endTransmisstion to see if
		// a device did acknowledge to the address.
		Wire.beginTransmission(address);
		error = Wire.endTransmission();

		if (error == 0)
		{
			Serial.print("I2C device found at address 0x");
			if (address<16) 
				Serial.print("0");
			Serial.print(address,HEX);
			Serial.println("	!");

			nDevices++;
		}
		else if (error==4) 
		{
			Serial.print("Unknown error at address 0x");
			if (address<16) 
				Serial.print("0");
			Serial.println(address,HEX);
		}		
	}
	if (nDevices == 0)
		Serial.println("No I2C devices found\n");
	else
		{
		Serial.print("done   ");
		Serial.print("nDevices = ");
		Serial.println(nDevices);
		}

	delay(10000);
}

// ---------------------------------------------------------------------

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