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
After some research i found this post which say that i can put my NRF52840 as a slave adding this line on prj.conf
Configuring 52832 for I2C slave mode using zephyr and VS code
i try but it doesn't work
There is some details of my code for the Slave configuration :
my 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 CONFIG_I2C_NRFX=y CONFIG_NRFX_TWIS0=y
// 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
&i2c1 {
status = "okay";
pinctrl-0 = <&i2c1_default>;
pinctrl-1 = <&i2c1_sleep>;
pinctrl-names = "default", "sleep";
mysensor: mysensor@77{
compatible = "i2c-device";
status = "okay";
reg = < 0x77 >;
};
};
&pinctrl {
/omit-if-no-ref/ i2c1_default: i2c1_default {
group1 {
psels = <NRF_PSEL(TWIM_SCL, 1, 14)>,
<NRF_PSEL(TWIM_SDA, 1, 15)>;
};
};
/omit-if-no-ref/ i2c1_sleep: i2c1_sleep {
group1 {
psels = <NRF_PSEL(TWIM_SCL, 1, 14)>,
<NRF_PSEL(TWIM_SDA, 1, 15)>;
low-power-enable;
};
};
};/*
* 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 8 - Define the addresses of relevant registers */
/* STEP 6 - Get the node identifier of the sensor */
#define I2C_NODE DT_NODELABEL(mysensor)
int main(void)
{
/* STEP 7 - Retrieve the API-specific device structure and make sure that the device is
* ready to use */
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;
}
return 0;
}
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");
}
}
To resume my code :
I try to put my NRF5340 DK as a Slave using the adress 0x77 and my NRF52840 as Master.
And after i try to read my NRF5340 Adress to be sure connection is ok but it doesn't work :
*** Using Zephyr OS v3.7.99-1f8f3dc29142 *** Failed to read from I2C device address
But i don't know my NRF52840 DK I2C adress, is there a way to make this communication possible ?
There is no particular address and you can select any address which is not being used by any other peripheral/register.
Also,
could you try to set the compatible = "nordic,nrf-twim"; for the slave?
I would suggest you to define them according to this: https://github.com/nrfconnect/sdk-nrf/blob/v2.9.1/tests/benchmarks/i2c_endless/boards/nrf52840dk_nrf52840.overlay#L61
-Priyanka