Hello everyone , I'm having trouble activating my DS18B20 temperature sensor (waterproof) with the nRF5340, SDK v2.3.0, and VS Code. I'm using the "zephyr/samples/sensor/ds18b20" template and have created the overlay file, but when I try to flash it, I get the error " no device found" despite the wiring is correct
Wiring :
GND + GND (nrf5340)
VCC + VDD (nrf5340)
DATA + P1.10 (nrf5340)
I think that the problem is in the overlay file .
Thanks.
Here is my code
main.c
/*
* Copyright (c) 2022 Thomas Stranger
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/sensor.h>
/*
* Get a device structure from a devicetree node with compatible
* "maxim,ds18b20". (If there are multiple, just pick one.)
*/
static const struct device *get_ds18b20_device(void)
{
const struct device *const dev = DEVICE_DT_GET_ANY(maxim_ds18b20);
if (dev == NULL) {
/* No such node, or the node does not have status "okay". */
printk("\nError: no device found.\n");
return NULL;
}
if (!device_is_ready(dev)) {
printk("\nError: Device \"%s\" is not ready; "
"check the driver initialization logs for errors.\n",
dev->name);
return NULL;
}
printk("Found device \"%s\", getting sensor data\n", dev->name);
return dev;
}
void main(void)
{
const struct device *dev = get_ds18b20_device();
if (dev == NULL) {
return;
}
while (1) {
struct sensor_value temp;
sensor_sample_fetch(dev);
sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp);
printk("Temp: %d.%06d\n", temp.val1, temp.val2);
k_sleep(K_MSEC(2000));
}
}
prj.conf
CONFIG_SENSOR=y CONFIG_W1=y CONFIG_LOG=y CONFIG_SENSOR_LOG_LEVEL_DBG=y
C:\ncs\ds18b20\nrf5340dk_nrf5340_cpuapp.overlay
// To get started, press Ctrl+Space to bring up the completion menu and view the available nodes.
// You can also use the buttons in the sidebar to perform actions on nodes.
// Actions currently available include:
// * Enabling / disabling the node
// * Adding the bus to a bus
// * Removing the node
// * Connecting ADC channels
// For more help, browse the DeviceTree documentation at https://docs.zephyrproject.org/latest/guides/dts/index.html
// You can also visit the nRF DeviceTree extension documentation at https://nrfconnect.github.io/vscode-nrf-connect/devicetree/nrfdevicetree.html
/*
* Copyright (c) 2022, Thomas Stranger
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
* Example configuration of a DS18B20 device on an Arduino serial bus.
* Requires external circuit to provide an open-drain interface.
*/
w1_0: w1-zephyr-serial-0 {
compatible = "zephyr,w1-serial";
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
ds18b20 {
compatible = "maxim,ds18b20";
family-code = <0x28>;
resolution = <12>;
status = "okay";
};
};
