RE: BMI088 and Zephyr I2C

Mike Pulice — Tue, 14 Mar 2023 17:16:30 GMT

Greetings,

I am currently working with the BMI088. This device separates the gyro and accel functions.

Whether spi or i2c your are going to have to have two entries to address each device separately.

This has already been done here (although for spi you can derive what you need though)
https://github.com/teamspatzenhirn/bmi088_zephyr_driver

RE: BMI088 and Zephyr I2C

Kazi Afroza Sultana — Mon, 28 Nov 2022 13:40:36 GMT

Hello,

Does the debug log report have any errors? You can enable the logging and provide us the log file.

RE: BMI088 and Zephyr I2C

pgonzaleztrucorp — Thu, 24 Nov 2022 09:43:38 GMT

Hi,

I have already tried changing it but I have the same problem.

I tried something more general like:

&arduino_i2c {
    mysensor: mysensor@19{
        compatible = "i2c-device";
        reg = < 0x19 >;
        label = "MYSENSOR";
    };
};

Also, I tried to read and write directly the registers (first time I try this):

this is my main.c

#include <zephyr.h>
#include <device.h>
#include <devicetree.h>
#include <drivers/i2c.h>
#include <sys/printk.h>

#define SLEEP_TIME_MS   500

/* Define the the addresses of relevant sensor registers and settings */
#define BMI08X_REG_ACCEL_CONF                           0x40
#define ACC_STATUS										0x03
#define ACC_PWR_CONF									0x7C
#define ACC_PWR_CTRL									0x7D
#define ACC_X_MSB										0x13
#define ACC_X_LSB										0x12

/*Get the node identifier of the sensor */
#define I2C_NODE DT_NODELABEL(mysensor)

void 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\r",dev_i2c.bus->name);
		return;
	}

/* Setup the sensor by writing the value 0x00 to the Power Configuration register */
	uint8_t config[2] = {ACC_PWR_CONF,0x00};
	uint8_t status[1] = {ACC_STATUS};
	ret = i2c_write_dt(&dev_i2c, config, sizeof(config));
	if(ret != 0){
		printk("Failed to write to I2C device address %x at Reg. %x \n", dev_i2c.addr,config[0]);
	}else{
		i2c_read_dt(&dev_i2c,status, sizeof(status));
		printk("Sensor is active, status is %x", dev_i2c.addr,status[0]);
	}

	while (1) {
/* Read the poition X of accelerometer from the sensor */
		uint8_t position_x[2]= {0};
		uint8_t sensor_regs[2] ={ACC_X_LSB, ACC_X_MSB};
		ret = i2c_write_read_dt(&dev_i2c,&sensor_regs[0],1,&position_x[0],1);
		if(ret != 0){
			printk("Failed to write/read I2C device address %x at Reg. %x \r\n", dev_i2c.addr,sensor_regs[0]);
		}
		ret = i2c_write_read_dt(&dev_i2c,&sensor_regs[1],1,&position_x[1],1);
		if(ret != 0){
			printk("Failed to write/read I2C device address %x at Reg. %x \r\n", dev_i2c.addr,sensor_regs[1]);
		}

		int Accel_X_int16;
		Accel_X_int16 = position_x[1] * 256 + position_x[0];

		//Print reading to console  
		printk("Position X : %u C \n", Accel_X_int16);
		k_msleep(SLEEP_TIME_MS);
	}
}

The output is Position X : 0

I did this following the register maps at https://download.mikroe.com/documents/datasheets/BMI088_Datasheet.pdf

RE: BMI088 and Zephyr I2C

Kazi Afroza Sultana — Thu, 24 Nov 2022 06:37:50 GMT

Hello Pablo,

''This is the overlay file, should I change the value of the register?''

Yes, you have to change it. If there is missing support for your sensor, you can create a feature request for it at zephyr.

https://github.com/zephyrproject-rtos/zephyr/issues/new/choose

Thanks.

Best Regards,

Kazi Afroza Sultana