I am using nRF52840 to interface my MPU6050 sensor via I2C , I build and flashed the program and there were no problem. But I can't see any clock signal on the default I2C Clock , even i checked all the GPIOs there was no clock at any pin
This is 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>
#include <zephyr/drivers/i2c.h>
#include <zephyr/sys/printk.h>
#define SLEEP_TIME_MS 1000
/* MPU6050 Register Addresses */
#define MPU6050_REG_PWR_MGMT_1 0x6B
#define MPU6050_REG_ACCEL_XOUT_H 0x3B
#define MPU6050_REG_ACCEL_XOUT_L 0x3C
#define MPU6050_REG_ACCEL_YOUT_H 0x3D
#define MPU6050_REG_ACCEL_YOUT_L 0x3E
#define MPU6050_REG_ACCEL_ZOUT_H 0x3F
#define MPU6050_REG_ACCEL_ZOUT_L 0x40
#define MPU6050_REG_TEMP_OUT_H 0x41
#define MPU6050_REG_TEMP_OUT_L 0x42
#define MPU6050_REG_GYRO_XOUT_H 0x43
#define MPU6050_REG_GYRO_XOUT_L 0x44
#define MPU6050_REG_GYRO_YOUT_H 0x45
#define MPU6050_REG_GYRO_YOUT_L 0x46
#define MPU6050_REG_GYRO_ZOUT_H 0x47
#define MPU6050_REG_GYRO_ZOUT_L 0x48
/* MPU6050 I2C Address */
#define MPU6050_I2C_ADDR 0x68
#define I2C_NODE DT_NODELABEL(mysensor)
int main(void)
{
int ret;
/* 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;
}
/* Wake up MPU6050 by writing 0x00 to the PWR_MGMT_1 register */
uint8_t pwr_mgmt[2] = {MPU6050_REG_PWR_MGMT_1, 0x00};
ret = i2c_write_dt(&dev_i2c, pwr_mgmt, sizeof(pwr_mgmt));
if (ret != 0) {
printk("Failed to write to I2C device address %x at Reg. %x \n", dev_i2c.addr, pwr_mgmt[0]);
return -1;
}
while (1) {
uint8_t accel_x[2] = {0}, accel_y[2] = {0}, accel_z[2] = {0};
uint8_t temp[2] = {0};
/* Read accelerometer and temperature data from the MPU6050 */
ret = i2c_burst_read_dt(&dev_i2c, MPU6050_REG_ACCEL_XOUT_H, accel_x, sizeof(accel_x));
ret |= i2c_burst_read_dt(&dev_i2c, MPU6050_REG_ACCEL_YOUT_H, accel_y, sizeof(accel_y));
ret |= i2c_burst_read_dt(&dev_i2c, MPU6050_REG_ACCEL_ZOUT_H, accel_z, sizeof(accel_z));
ret |= i2c_burst_read_dt(&dev_i2c, MPU6050_REG_TEMP_OUT_H, temp, sizeof(temp));
if (ret != 0) {
printk("Failed to read from I2C device address %x \n", dev_i2c.addr);
return -1;
}
/* Convert the accelerometer and temperature data */
int16_t accel_x_val = (accel_x[0] << 8) | accel_x[1];
int16_t accel_y_val = (accel_y[0] << 8) | accel_y[1];
int16_t accel_z_val = (accel_z[0] << 8) | accel_z[1];
int16_t temp_val = (temp[0] << 8) | temp[1];
/* Convert temperature to Celsius */
double cTemp = (temp_val / 340.0) + 36.53;
/* Print the accelerometer and temperature data */
printk("Accel X: %d, Accel Y: %d, Accel Z: %d\n", accel_x_val, accel_y_val, accel_z_val);
printk("Temperature in Celsius: %.2f C\n", cTemp);
k_msleep(SLEEP_TIME_MS);
}
}
this is my prj.config file
&i2c0{
mysensor:mysensor@68{
compatible = "i2c-device";
reg = < 0x68 >;
label = "MYSENSOR";
};
};