How to use I2C on nRF52840 Dongle ?

[rickygai]

Hi,

I am not sure whether there is I2C pins on nRF52840 Dongle board as based on the Adafruit Feather nRF52840 Express the pin is P0.11 and P0.12 as shown below:
SCL 0.11 and SCK 0.14 are at the back of the nRF52840 Dongle but SDA 0.12 is missing from the nRF52840 Dongle board.





There is a Youtube link shown the use of I2C display with nRF52840 Dongle but lacking explanation.

https://www.youtube.com/watch?v=vJUrG41tYFw


I am new to Nordic nRF52840 Dongle board and trying to support it under Arduino platform, but found out many missing important protocol pins.
Otherwise, I will just use Adafruit Feather nRF52840 Express.

May I know is the pin number held on Nordic nRF52840 (eg. 0.11) and on the schematic diagram (SCL P0.11) from Adafruit nRF52840 Express the same ?

Please advise.

[RodWatt]

Hi,

I have been using this board over I2C for a while; works fine. IN addition, I am using a USB - serial convertor connected over UART. Here is the overlay file I use

&uart0 {
  compatible = "nordic,nrf-uart"; 
  status = "okay";  
  current-speed = <115200>;
  tx-pin = <20>;
  rx-pin = <24>;
};

&i2c0 {
        status = "okay";
        sda-pin = <13>;
        scl-pin = <15>;
 //       clock-frequency = <I2C_BITRATE_SLOW>;
	bme680@77 {
		compatible = "bosch,bme680";
		reg = <0x77>;
		label = "BME680";
	};


};

Hope this helps

Rod

[rickygai]

hi Rod,

1. the sda-pin and scl-pin is it referred to p0.13 and p0.15 ?

2. I am new to nRF52840 Dongle, do you have any references to the overlay file configuration ?

3. If I am developing under Arduino framework, that means there is totally no way to use I2C in this case ?

Please advise.

[RodWatt]

Hi,

You should be able to simply update the overly file to match the pinout.  Th overlay file I sent is fairly generic, should work with the board. Sorry, I had not used the Ardiuno stuff

Rod