I2C communication with two NRF DK

[D.MASSIALA]

Hi,

I want to make an I2C communication with an NRF5340 DK as Master and an NRF52840 as Slave, but all the example i found in I2C communication it use the slave adress to communicate,

But i don't know my NRF52840 DK I2C adress, is there a way to make this communication possible ? 

Thank you for your help,

Best Regards,

Daroussi 

[D.MASSIALA]

For the master config i have this : 

prj.conf : 

#
# Copyright (c) 2016 Intel Corporation
#
# SPDX-License-Identifier: Apache-2.0
#

# STEP 2 - Enable the I2C driver
CONFIG_I2C=y
# STEP 4.2 - Enable floating point format specifiers
CONFIG_CBPRINTF_FP_SUPPORT=y

my overlay: 

// To get started, press Ctrl+Space to bring up the completion menu and view the available nodes.
// For more help, browse the DeviceTree documentation at https://docs.zephyrproject.org/latest/guides/dts/index.html

&i2c0 {
    status = "okay";
    pinctrl-0 = <&i2c0_default>;
	pinctrl-1 = <&i2c0_sleep>;
    pinctrl-names = "default", "sleep";
    mysensor: mysensor@77{
        compatible = "i2c-device";
        status = "okay";
        reg = < 0x77 >;
    };
};

&pinctrl {
	/omit-if-no-ref/ i2c0_default: i2c0_default {
		group1  {
			psels = <NRF_PSEL(TWIM_SCL, 1, 14)>,
					<NRF_PSEL(TWIM_SDA, 1, 15)>;
		};
	};

	/omit-if-no-ref/ i2c0_sleep: i2c0_sleep {
		group1  {
			psels = <NRF_PSEL(TWIM_SCL, 1, 14)>,
					<NRF_PSEL(TWIM_SDA, 1, 15)>;
			low-power-enable;
		};
	};
};

my main.c

/*
 * Copyright (c) 2016 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
/* STEP 3 - Include the header file of the I2C API */
#include <zephyr/drivers/i2c.h>
/* STEP 4.1 - Include the header file of printk() */
#include <zephyr/sys/printk.h>
/* 1000 msec = 1 sec */
#define SLEEP_TIME_MS 1000

/* STEP 6 - Get the node identifier of the sensor */
#define I2C_NODE DT_NODELABEL(mysensor)





int main(void)
{
	static const struct i2c_dt_spec dev_i2c = I2C_DT_SPEC_GET(I2C_NODE);

	if (!device_is_ready(dev_i2c.bus)) {
		printk("I2C bus %s is not ready!\n", dev_i2c.bus->name);
		return -1;
	}

	

	uint8_t data;
	int ret = i2c_read_dt(&dev_i2c, &data, sizeof(data));
	if(ret != 0){
		printk("Failed to read from I2C device address");
	}


}