#include <Wire.h>
#include <Arduino.h>
long speed[] = { 50, 100, 200, 250, 400, 500, 800 };
const int speeds = sizeof(speed)/sizeof(speed[0]);
#define RESTORE_LATENCY 5
bool delayFlag = false;
bool printAll = true;
bool header = true;
enum states { STOP, ONCE, CONT, HELP };
states state = STOP;
uint32_t startScan;
uint32_t stopScan;
void setup() {
Serial.begin(115200);
Wire.begin();
displayHelp();
}
void loop() {
switch (getCommand()) {
case 's': state = ONCE; break;
case 'c': state = CONT; break;
case 'd': delayFlag = !delayFlag; Serial.print(F("<delay=")); Serial.println(delayFlag?F("5>"):F("0>")); break;
case 'e': break;
case 'h': header = !header; Serial.print(F("<header=")); Serial.println(header?F("yes>"):F("no>")); break;
case '?': state = HELP; break;
case 'p': printAll = !printAll; Serial.print(F("<print=")); Serial.println(printAll?F("all>"):F("found>")); break;
case 'q': state = HELP; break;
default: break;
}
switch(state) {
case ONCE: I2Cscan(); state = HELP; break;
case CONT: I2Cscan(); delay(1000); break;
case HELP: displayHelp(); state = STOP; break;
case STOP: break;
default: break;
}
}
char getCommand() {
char c = '\0';
if (Serial.available()) { c = Serial.read(); }
return c;
}
void displayHelp() {
Serial.println(F("\nArduino I2C Scanner - 0.1.03\n"));
Serial.println(F("\ts = single scan"));
Serial.println(F("\tc = continuous scan - 1 second delay"));
Serial.println(F("\tq = quit continuous scan"));
Serial.println(F("\td = toggle latency delay between successful tests."));
Serial.println(F("\tp = toggle printAll - printFound."));
Serial.println(F("\th = toggle header - noHeader."));
Serial.println(F("\t? = help - this page"));
Serial.println();
}
void I2Cscan() {
startScan = millis();
uint8_t count = 0;
if (header) { Serial.print(F("TIME\tDEC\tHEX\t"));
for (uint8_t s = 0; s < speeds; s++) {
Serial.print(F("\t"));
Serial.print(speed[s]);
}
Serial.println(F("\t[KHz]"));
for (uint8_t s = 0; s < speeds + 5; s++) { Serial.print(F("--------")); }
Serial.println();
}
for (uint8_t address = 8; address < 120; address++) {
bool printLine = printAll;
bool found[speeds];
bool fnd = false;
for (uint8_t s = 0; s < speeds ; s++) {
Wire.beginTransmission (address);
found[s] = (Wire.endTransmission () == 0);
fnd |= found[s];
if (fnd && delayFlag) delay(RESTORE_LATENCY); // give device 5 millis
}
if (fnd) count++;
printLine |= fnd;
if (printLine) {
Serial.print(millis()); Serial.print(F("\t"));
Serial.print(address, DEC); Serial.print(F("\t0x"));
Serial.print(address, HEX); Serial.print(F("\t"));
for (uint8_t s = 0; s < speeds ; s++) { Serial.print(F("\t")); Serial.print(found[s]? F("V"):F(".")); }
Serial.println();
}
}
stopScan = millis();
if (header) {
Serial.println();
Serial.print(count);
Serial.print(F(" devices found in "));
Serial.print(stopScan - startScan);
Serial.println(F(" milliseconds."));
}
}
