Hello,
I am trying to read ISM330DHCX accelerometer (Adafruit product) data using nRF522832 but I am getting zeros all the time regardless whether the sensor is moved or not. I am following the I2C protocol. I can read the sensor on Arduino. The sensor has pull up resistors for both SDA and SCL.
Here is the overlay file:
&i2c0 { mysensor: mysensor@6A{ compatible = "i2c-device"; reg = < 0x6A >; label = "MYSENSOR"; }; };
Here is the main.c:
A screenshot of the VCode
![](/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/Screenshot-2024_2D00_08_2D00_25-at-5.14.07_2F20_PM.png)
#include <zephyr/types.h> #include <zephyr/drivers/i2c.h> #include <zephyr/sys/printk.h> #include <zephyr/kernel.h> #define ISM330DHCX_I2C_ADDR 0x6A // Define the I2C device specification static const struct i2c_dt_spec i2c_dev = I2C_DT_SPEC_GET(DT_NODELABEL(mysensor)); static int ism330dhcx_init(void) { uint8_t who_am_i; uint8_t config1[] = { 0x10, // CTRL1_XL register address 0x60 // 104 Hz, ±4g, Normal mode }; // Write to CTRL1_XL to configure accelerometer int ret = i2c_write_dt(&i2c_dev, config1, sizeof(config1)); if (ret != 0) { printk("Failed to configure ISM330DHCX CTRL1_XL (error: %d)\n", ret); return -EIO; } // Read WHO_AM_I register (0x0F) uint8_t reg_addr = 0x0F; ret = i2c_write_dt(&i2c_dev, ®_addr, sizeof(reg_addr)); if (ret != 0) { printk("Failed to set WHO_AM_I register address (error: %d)\n", ret); return -EIO; } ret = i2c_read_dt(&i2c_dev, &who_am_i, sizeof(who_am_i)); if (ret != 0) { printk("Failed to read WHO_AM_I register from I2C device address %x\n", i2c_dev.addr); return -EIO; } printk("WHO_AM_I register value: 0x%02x\n", who_am_i); if (who_am_i != 0x6B) { printk("WHO_AM_I register mismatch: expected 0x6B, got 0x%02x\n", who_am_i); return -EIO; } printk("ISM330DHCX initialized successfully\n"); return 0; } static int ism330dhcx_read(int16_t *ax, int16_t *ay, int16_t *az) { uint8_t buffer[6]; uint8_t status; int ret; // Check data ready status uint8_t reg_addr = 0x1E; ret = i2c_write_dt(&i2c_dev, ®_addr, sizeof(reg_addr)); if (ret != 0) { printk("Failed to set STATUS_REG address (error: %d)\n", ret); return -EIO; } ret = i2c_read_dt(&i2c_dev, &status, sizeof(status)); if (ret != 0) { printk("Failed to read STATUS_REG from I2C device address %x\n", i2c_dev.addr); return -EIO; } if (!(status & 0x01)) { printk("No new accelerometer data available\n"); return -EIO; } // Read accelerometer data starting from register 0x28 reg_addr = 0x28 | 0x80; // 0x80 sets the auto-increment bit ret = i2c_write_dt(&i2c_dev, ®_addr, sizeof(reg_addr)); if (ret != 0) { printk("Failed to set accelerometer data start address (error: %d)\n", ret); return -EIO; } ret = i2c_read_dt(&i2c_dev, buffer, sizeof(buffer)); if (ret != 0) { printk("Failed to read accelerometer data from I2C device address %x\n", i2c_dev.addr); return -EIO; } *ax = (int16_t)(buffer[0] | (buffer[1] << 8)); *ay = (int16_t)(buffer[2] | (buffer[3] << 8)); *az = (int16_t)(buffer[4] | (buffer[5] << 8)); printk("Raw data read: X=%d, Y=%d, Z=%d\n", *ax, *ay, *az); return 0; } void main(void) { int err; printk("Starting minimal ISM330DHCX example\n"); if (!device_is_ready(i2c_dev.bus)) { printk("I2C device not found\n"); return; } err = ism330dhcx_init(); if (err) { printk("Failed to initialize ISM330DHCX\n"); return; } int16_t raw_x, raw_y, raw_z; while (1) { err = ism330dhcx_read(&raw_x, &raw_y, &raw_z); if (err == 0) { printk("Accelerometer Data - X: %d, Y: %d, Z: %d\n", raw_x, raw_y, raw_z); } else { printk("Failed to read accelerometer data\n"); } k_sleep(K_MSEC(500)); // Sleep for 500 milliseconds before reading again } }
A screenshot of the VCode
![](/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/Screenshot-2024_2D00_08_2D00_25-at-5.14.07_2F20_PM.png)