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June 13, 2018 23:21
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/* | |
* i2c_port_address_scanner | |
* Scans ports D0 to D7 on an ESP8266 and searches for I2C device. based on the original code | |
* available on Arduino.cc and later improved by user Krodal and Nick Gammon (www.gammon.com.au/forum/?id=10896) | |
* D8 throws exceptions thus it has been left out | |
* | |
*/ | |
#include <Wire.h> | |
#include "FastLED.h" | |
#define NUM_LEDS 2 | |
#define DATA_PIN D5 | |
// Define the array of leds | |
CRGB leds[NUM_LEDS]; | |
void setup() { | |
Serial.begin(115200); | |
while (!Serial); // Leonardo: wait for serial monitor | |
Serial.println("\n\nI2C Scanner to scan for devices on each port pair D0 to D7"); | |
FastLED.addLeds<WS2812B, DATA_PIN, RGB>(leds, NUM_LEDS); | |
} | |
uint8_t portArray[] = {16, 5, 4, 0, 2, 14, 12, 13}; | |
String portMap[] = {"D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7"}; //for Wemos | |
//String portMap[] = {"GPIO16", "GPIO5", "GPIO4", "GPIO0", "GPIO2", "GPIO14", "GPIO12", "GPIO13"}; | |
void scanPorts() { | |
for (uint8_t i = 0; i < sizeof(portArray); i++) { | |
for (uint8_t j = 0; j < sizeof(portArray); j++) { | |
if (i != j){ | |
Serial.print("Scanning (SDA : SCL) - " + portMap[i] + " : " + portMap[j] + " - "); | |
Wire.begin(portArray[i], portArray[j]); | |
check_if_exist_I2C(); | |
} | |
} | |
} | |
} | |
void check_if_exist_I2C() { | |
byte error, address; | |
int nDevices; | |
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("Unknow error at address 0x"); | |
if (address < 16) | |
Serial.print("0"); | |
Serial.println(address, HEX); | |
} else { | |
//Serial.print("("); | |
//Serial.print(address); | |
//Serial.print(")"); | |
} | |
} //for loop | |
if (nDevices == 0) | |
Serial.println("No I2C devices found"); | |
else | |
Serial.println("**********************************\n"); | |
//delay(1000); // wait 1 seconds for next scan, did not find it necessary | |
} | |
void loop() { | |
leds[0] = CRGB::Red; | |
leds[1] = CRGB::Black; | |
FastLED.show(); | |
delay(1000); | |
scanPorts(); | |
leds[0] = CRGB::Black; | |
leds[1] = CRGB::Black; | |
FastLED.show(); | |
delay(3000); | |
} | |
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