I2CU

Published 03 Sep 2009, by Simon Ford

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main.cpp

00001 // I2CU - Search for devices on an I2C bus
00002 // Copyright (c) 2009, sford
00003 // Released under the MIT License: http://mbed.org/license/mit
00004 //
00005 // Goes through each device address, seeing if it gets a response
00006 //  - for every device if finds, it prints the 8-bit address
00007 //  - if the program hangs, the bus isn't working (check pull-ups etc)
00008 //  - if it doesn't find your device, check power/bus wiring etc
00009  
00010 #include "mbed.h"
00011 
00012 I2C i2c(p9, p10); // sda, scl
00013 
00014 int main() {
00015     printf("I2CU! Searching for I2C devices...\n");
00016 
00017     int count = 0;
00018     for (int address=0; address<256; address+=2) {
00019         if (!i2c.write(address, NULL, 0)) { // 0 returned is ok
00020             printf(" - I2C device found at address 0x%02X\n", address);
00021             count++;
00022         }
00023     }
00024     printf("%d devices found\n", count);
00025 }