File content as of revision 0:2ccb0f491eab:

#include "mbed.h"
 
 
I2C i2c(I2C_SDA, I2C_SCL);
 
 
Serial pc(SERIAL_TX, SERIAL_RX);
 
#define CHAR_BIT 8
#define FMT_BUF_SIZE (CHAR_BIT*sizeof(uintmax_t)+1)
char *binary_fmt(uintmax_t x, char* buf)
{
    char *s = buf + FMT_BUF_SIZE;
    *--s = 0;
    if (!x) *--s = '0';
    for(; x; x/=2) *--s = '0' + x%2;
    return s;
}
char binary_buffer[FMT_BUF_SIZE];


char text_buffer[100];
char* getDeviceName(int addr){
    int devType = (addr & 0xf0) >> 4;
    
    int count = 0;
    
    switch(devType){
    case 0:
        count += sprintf(text_buffer + count, "General call");
        break;   
    case 0x9:
        count += sprintf(text_buffer + count, "TMP10X");
        break;
    case 0xD:
        count += sprintf(text_buffer + count, "ADC MCP3428");
        break;
    case 0xC:
        count += sprintf(text_buffer + count, "DAC MCP4728");
        break;
    case 0x4:
        count += sprintf(text_buffer + count, "IO Expander PCF8574");
        break;
    case 0xA:
        count += sprintf(text_buffer + count, "FRAM FM24CL16B");
        break;
    default:
        count += sprintf(text_buffer + count, "unknown");
    }
    
    int addrPins = (addr & 0xf) >> 1;
    int rw = (addr & 1);
    
    count += sprintf(text_buffer + count, " addr: %s %s", binary_fmt(addrPins, binary_buffer), rw ? "read" : "write");
    
    return text_buffer;
}


void findDevices(void)
{
    pc.printf("Scanning for devices ..\n");
    for(int i=0; i<256; i++) {
        if(i2c.write(i, NULL, 0, 0) == 0){
            printf("Device %s is present: %s\n", binary_fmt(i, binary_buffer), getDeviceName(i));
            //printf("Device %i present\n", i);
        }
//        else
//           printf("Device %i not present\n", i);
    }

}

int main()
{
 
 
    while (1) {
        findDevices();
        wait(1.0);
    }
 
}