mbed_example / Mbed OS I2C_HelloWorld

I2C Hello World, I2C Example

Fork of I2C_HelloWorld_Mbed by Mbed

Use

The mbed I2C API uses 8 bit addressing and will auto append the 0 or 1 for read/write mode. Please keep in mind that every I2C set up has its own quirks so this example may not work out of the box for your sensor / application. Make sure to check the data sheet for your part for the timing / register access specification.

API

API reference.

Import librarymbed

No documentation found.

main.cpp

Committer:
mbedAustin
Date:
2014-09-21
Revision:
2:ab0e4b55d7da
Parent:
0:f76c26307f9a
Child:
3:df6232c70efd

File content as of revision 2:ab0e4b55d7da:

#include "mbed.h"
 
// Read temperature from LM75BD

I2C i2c(I2C_SDA , I2C_SCL ); 

const int addr7bit = 0x48;      // 7 bit I2C address
const int addr8bit = 0x48 << 1; // 8bit I2C address, 0x90

int main() {
    char cmd[2];
    while (1) {
        cmd[0] = 0x01;
        cmd[1] = 0x00;
        i2c.write(addr8bit, cmd, 2);
 
        wait(0.5);
 
        cmd[0] = 0x00;
        i2c.write(addr8bit, cmd, 1);
        i2c.read( addr8bit, cmd, 2);
 
        float tmp = (float((cmd[0]<<8)|cmd[1]) / 256.0);
        printf("Temp = %.2f\n", tmp);
    }
}