I am using nRF52840 DK and I run my project using VS Code.
I wanted to run MPU 6050 accelerometer example for my DK. Below are my configuration I had setup for running the example.
Vcc of sensor ----> VDD of nRF52840DK
GND sensor -----> GND of DK
SCL of sensor ----> P0.27 of DK
SDA of sensor-----> P0.26 of DK
I loaded the MPU6050 example application in VS Code and I created the 'nrf52840dk_nrf52840.overlay' for the board and below is the content for the 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 {
compatible = "nordic,nrf-twim";
status = "okay";
sda-pin = < 27 >;
scl-pin = < 26 >;
clock-frequency = <I2C_BITRATE_STANDARD>;
/* The I2C address could be one of two, here 0x76 is assumed */
mpu6050@68 {
compatible = "invensense,mpu6050";
reg = <0x68>;
status = "okay";
label = "MPU6050";
int-gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>;
};
};
&spi0 {
status = "disabled";
};/*
* Copyright (c) 2019 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <device.h>
#include <drivers/sensor.h>
#include <stdio.h>
static const char *now_str(void)
{
static char buf[16]; /* ...HH:MM:SS.MMM */
uint32_t now = k_uptime_get_32();
unsigned int ms = now % MSEC_PER_SEC;
unsigned int s;
unsigned int min;
unsigned int h;
now /= MSEC_PER_SEC;
s = now % 60U;
now /= 60U;
min = now % 60U;
now /= 60U;
h = now;
snprintf(buf, sizeof(buf), "%u:%02u:%02u.%03u",
h, min, s, ms);
return buf;
}
static int process_mpu6050(const struct device *dev)
{
struct sensor_value temperature;
struct sensor_value accel[3];
struct sensor_value gyro[3];
int rc = sensor_sample_fetch(dev);
if (rc == 0) {
rc = sensor_channel_get(dev, SENSOR_CHAN_ACCEL_XYZ,
accel);
}
if (rc == 0) {
rc = sensor_channel_get(dev, SENSOR_CHAN_GYRO_XYZ,
gyro);
}
if (rc == 0) {
rc = sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP,
&temperature);
}
if (rc == 0) {
printf("[%s]:%g Cel\n"
" accel %f %f %f m/s/s\n"
" gyro %f %f %f rad/s\n",
now_str(),
sensor_value_to_double(&temperature),
sensor_value_to_double(&accel[0]),
sensor_value_to_double(&accel[1]),
sensor_value_to_double(&accel[2]),
sensor_value_to_double(&gyro[0]),
sensor_value_to_double(&gyro[1]),
sensor_value_to_double(&gyro[2]));
} else {
printf("sample fetch/get failed: %d\n", rc);
}
return rc;
}
#ifdef CONFIG_MPU6050_TRIGGER
static struct sensor_trigger trigger;
static void handle_mpu6050_drdy(const struct device *dev,
const struct sensor_trigger *trig)
{
int rc = process_mpu6050(dev);
if (rc != 0) {
printf("cancelling trigger due to failure: %d\n", rc);
(void)sensor_trigger_set(dev, trig, NULL);
return;
}
}
#endif /* CONFIG_MPU6050_TRIGGER */
void main(void)
{
const char *const label = DT_LABEL(DT_INST(0, invensense_mpu6050));
const struct device *mpu6050 = device_get_binding(label);
if (!mpu6050) {
printf("Failed to find sensor %s\n", label);
return;
}
#ifdef CONFIG_MPU6050_TRIGGER
trigger = (struct sensor_trigger) {
.type = SENSOR_TRIG_DATA_READY,
.chan = SENSOR_CHAN_ALL,
};
if (sensor_trigger_set(mpu6050, &trigger,
handle_mpu6050_drdy) < 0) {
printf("Cannot configure trigger\n");
return;
}
printk("Configured for triggered sampling.\n");
#endif
while (!IS_ENABLED(CONFIG_MPU6050_TRIGGER)) {
int rc = process_mpu6050(mpu6050);
if (rc != 0) {
break;
}
k_sleep(K_SECONDS(2));
}
/* triggered runs with its own thread after exit */
}