How to configure two or more sensors (Having different Address) on same i2c bus in Zephyr RTOS - NRF connect SDK

Question

Hi Everyone, 
 I am trying to configure multiple sensors on same I2C bus using Zephyr RTOS, but I am not able to find any reference for the same. 
 Can anyone please help me in Configuring two sensor on same i2c bus in Zephyr RTOS? I am able to interface single sensor on I2C port but how can we interface multiple sensors(4-5 sensors with different i2c address)on the same i2c bus in Zephyr RTOS – NRF connect SDK.

Thanks & Regards, 
 Pradeep

helsing · Accepted Answer

Here is a mock up example, inspired by the article Introduction to devicetree.

Create a file named <board_variant>.overlay and add the code below to this file. Place the file in your project folder.

Read more about overlay files in the getting started guide for nRF Connect SDK:

                i2c0 {
                        compatible = "nordic,nrf-twim";
                        status = "okay";
                        label = "I2C_0";
                        sda-pin = <30>;
                        scl-pin = <31>;
                        clock-frequency = <I2C_BITRATE_FAST>;

                        apds9960@39 {
                                compatible = "avago,apds9960";
                                label = "APDS9960";
                                reg = <0x39>;
                        };
                        ti_hdc@43 {
                                compatible = "ti,hdc", "ti,hdc1010";
                                label = "HDC1010";
                                reg = <0x43>;
                        };
                        mma8652fc@1d {
                                compatible = "nxp,fxos8700", "nxp,mma8652fc";
                                label = "MMA8652FC";
                                reg = <0x1d>;
                        };
                };

Here is another example:

&i2c2 {
    compatible = "nordic,nrf-twim";
	status = "okay";
	sda-pin = < 30 >;
	scl-pin = < 31 >;
    clock-frequency = <I2C_BITRATE_STANDARD>;  
	

	bme280@82 {
		compatible = "bosch,bme280";
		reg = <0x82>;
		label = "BME280";
	};
	
		bme280@76 {
		compatible = "bosch,bme280";
		reg = <0x76>;
		label = "BME280";
	};
	
};

Please also consult this guide: TWI/I2C implementation with nRFx TWIS Driver.

Would you be able to share your overlay file?

Best regards,

Håkon

How to configure two or more sensors (Having different Address) on same i2c bus in Zephyr RTOS - NRF connect SDK

Top Replies