i2c-scanner-rhombio-l476dmw1k - Example of i2c scanner for RHOMBIO_L476DMW1K

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Example of i2c scanner for RHOMBIO_L476DMW1K

This example is known to work well on the following platforms: RHOMBIO_L476DMW1K

The example code scans any I2C peripheral attached to the kit, whether it is any rhomb.io slave module attached to Deimos carrier board or any external peripheral wired to SDA, SCL and GND pins available on Deimos pin header H2.

The code also prints out the result, showing the address of any device found on the I2C bus.

This example code should give you an output similar to this:

Rhomb.io example code - I2C Scanner

Searching for I2C devices...

I2C device found at address 0x60 (0xC0 in 8-bit)

1 device. found

PS: RHOMBIO_L476DMW1K IoT kit comes with a ATECC608A crypto authentication memory on board, which is connected to the I2C bus. Its I2C slave address is 0x60, that's the device found by the example code when no other I2C device has been connected to the kit.

main.cpp

Committer:: galonso@rhomb.io
Date:: 2019-09-10
Revision:: 1:9281da0f55a2
Parent:: 0:dc5bc0efc11d

File content as of revision 1:9281da0f55a2:

/* i2c-scanner-rhombio-l476dmw1k
 * 
 * Copyright (c) 2019 rhomb.io
 * 
 * MIT License
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "mbed.h"


I2C i2c(I2C_SDA, I2C_SCL); 
DigitalOut led(LED1);


int main()
{
    led = 1;
     
    i2c.frequency(100000);
    printf("Rhomb.io example code - I2C Scanner\n\r");
    printf("-----------------------------------\n\r");
   
    while (1) {
        printf("Searching for I2C devices...\n\r");

        int count = 0;
        for (int address = 0; address < 255; address +=2) { // check only for device's read addres
            if (!i2c.write(address, NULL, 0)) { // 0 returned is ok
                printf("I2C device found at address 0x%02X (0x%02X in 8-bit)\n\r", address >> 1, address);  // the address is without LSB, which is R/W flag. shoft it right once
                count++;
                led = 1;
            }
            wait(0.02);
        }
        if (count)
            printf("%d", count);
        else
            printf("No");
        printf(" device%c found\n\r\n", count == 1?'\0':'s');
        led = 0;
        wait (1.8);
    }
}