Chuck Swiger / Mbed OS FTHRChirpChangeAddr

Change i2c address in the Chirp! sensor

main.cpp

Committer:
cswiger
Date:
2018-07-31
Revision:
0:0b271f6ca9be

File content as of revision 0:0b271f6ca9be:

#include "mbed.h"
 
// Change Chirp! Address - default starts with 0x20

I2C i2c(P3_4, P3_5);

int addr = 0x20;
int addr8 = addr << 1;

int main() {
    char cmd[2];
    wait(30.0);     // give user time to connect to serial port

    cmd[0] = 0x01;  // change address command
    cmd[1] = 0x21;  // new address
    i2c.write(addr8, cmd, 2);
        
    // update address
    // The above does successfully change the address, but 0x21 won't read until the device is reset
    addr = 0x20;        // try 0x20 here, the device is still 0x20 and should read 0x21 from eeprom
    addr8 = addr << 1;
        
    wait(2.0);
        
    cmd[0] = 0x02;      // read address from eeprom 
    i2c.write(addr8, cmd, 1);
    i2c.read(addr8, cmd, 1);
 
    printf("New address read: %d",cmd[0]);       

}