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/**
i2c port scanner based on:
in wire library examples i2c_scanner
https://learn.adafruit.com/adafruit-pca9548-8-channel-stemma-qt-qwiic-i2c-multiplexer/arduino
*
*/
#include <Wire.h>
#define PCAADDR 0x70 //i2c address of the i2c multiplexer
void setup() {
Serial.begin(115200);
while (!Serial); // Leonardo: wait for Serial Monitor
Serial.println("\nI2C Scanner");
}
void pcaselect(uint8_t i) {
if (i > 7) return;
Wire.beginTransmission(PCAADDR);
Wire.write(1 << i);
Wire.endTransmission();
}
void scandirectports(){
Wire.begin();
int nDevices = 0;
Serial.println("Scanning for i2c ports on board...");
for (byte address = 1; address < 127; ++address) {
// The i2c_scanner uses the return value of
// the Wire.endTransmission to see if
// a device did acknowledge to the address.
Wire.beginTransmission(address);
byte 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.println("done\n");
}
Serial.println("done scanning for i2c ports on board");
}
void scani2cmultiplexer(){
Serial.println("Scanning for i2c ports on i2c multiplexer...");
for (uint8_t t=0; t<8; t++) {
pcaselect(t);
Serial.print("PCA Port #"); Serial.println(t);
for (uint8_t addr = 0; addr<=127; addr++) {
if (addr == PCAADDR) continue;
Wire.beginTransmission(addr);
if (!Wire.endTransmission()) {
Serial.print("Found I2C 0x"); Serial.println(addr,HEX);
}
}
}
Serial.println("done scanning for i2c ports on i2c multiplexer");
}
void loop() {
scandirectports();
delay(1000);
scani2cmultiplexer();
delay(1000);
}
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