Arduino – I2C-Bus Scanner
Wat is een I2C-bus?
De I2C-bus (spreek uit als: I kwadraat C bus), eertijds aangeduid met IIC-bus (Inter-IC-bus), is een synchrone, seriële bus, ontwikkeld voor datacommunicatie tussen microprocessoren en andere IC’s, meestal op één enkele printplaat.
I2C Scanner (playground.arduino.cc)
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// // FILE: MultiSpeedI2CScanner.ino // AUTHOR: Rob Tillaart // VERSION: 0.1.04 // PURPOSE: I2C scanner @different speeds // DATE: 2013-11-05 // URL: http://forum.arduino.cc/index.php?topic=197360 // // Released to the public domain // #include <Wire.h> #include <Arduino.h> // scans devices from 50 to 800KHz I2C speeds. // lower than 50 is not possible // DS3231 RTC works on 800 KHz. TWBR = 2; (?) long speed[] = { 50, 100, 200, 250, 400, 500, 800 }; const int speeds = sizeof(speed)/sizeof(speed[0]); // DELAY BETWEEN TESTS #define RESTORE_LATENCY 5 // for delay between tests of found devices. bool delayFlag = false; // MINIMIZE OUTPUT bool printAll = true; bool header = true; // STATE MACHINE 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': // eeprom test TODO 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: // ignore all non commands 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(); } // TEST // 0.1.04: tests only address range 8..120 // -------------------------------------------- // Address R/W Bit Description // 0000 000 0 General call address // 0000 000 1 START byte // 0000 001 X CBUS address // 0000 010 X reserved - different bus format // 0000 011 X reserved - future purposes // 0000 1XX X High Speed master code // 1111 1XX X reserved - future purposes // 1111 0XX X 10-bit slave addressing 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++) { TWBR = (F_CPU/(speed[s]*1000) - 16)/2; Wire.beginTransmission (address); found[s] = (Wire.endTransmission () == 0); fnd |= found[s]; // give device 5 millis if (fnd && delayFlag) delay(RESTORE_LATENCY); } 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.")); } } |
MultiSpeed I2C Scanner (Rob Tilaart) – 50,100,200,400 KHz
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Arduino I2C Scanner s = single scan c = continuous scan - 1 second delay q = quit continuous scan d = toggle delay(5) between addresses. p = toggle printAll - printFound. h = toggle header - noHeader. ? = help - this page |
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// // FILE: MultiSpeedI2CScanner.ino // AUTHOR: Rob Tillaart // VERSION: 0.1.04 // PURPOSE: I2C scanner @different speeds // DATE: 2013-11-05 // URL: http://forum.arduino.cc/index.php?topic=197360 // // Released to the public domain // #include <Wire.h> #include <Arduino.h> // scans devices from 50 to 800KHz I2C speeds. // lower than 50 is not possible // DS3231 RTC works on 800 KHz. TWBR = 2; (?) long speed[] = { 50, 100, 200, 250, 400, 500, 800 }; const int speeds = sizeof(speed)/sizeof(speed[0]); // DELAY BETWEEN TESTS #define RESTORE_LATENCY 5 // for delay between tests of found devices. bool delayFlag = false; // MINIMIZE OUTPUT bool printAll = true; bool header = true; // STATE MACHINE 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': // eeprom test TODO 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: // ignore all non commands 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(); } // TEST // 0.1.04: tests only address range 8..120 // -------------------------------------------- // Address R/W Bit Description // 0000 000 0 General call address // 0000 000 1 START byte // 0000 001 X CBUS address // 0000 010 X reserved - different bus format // 0000 011 X reserved - future purposes // 0000 1XX X High Speed master code // 1111 1XX X reserved - future purposes // 1111 0XX X 10-bit slave addressing 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++) { TWBR = (F_CPU/(speed[s]*1000) - 16)/2; Wire.beginTransmission (address); found[s] = (Wire.endTransmission () == 0); fnd |= found[s]; // give device 5 millis if (fnd && delayFlag) delay(RESTORE_LATENCY); } 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.")); } } |
