P-Series中的主题 Re: i am unable to write and read registers from slve Device(Accelometer LIS331DLH)perticular location ?

i am unable to write and read registers from slve Device(Accelometer LIS331DLH)perticular location ?

nareshpuli — Mon, 06 Aug 2018 04:30:18 GMT

we are using P2020 Processor with the linux platform, I2C interface with LIS331DLH Accelerometer sensor

Actually i am writing the application in the user level to read Accelerometer LIS331DLH sensor data X-axis, Y-axis,Z-axis Value

here i am facing issue, i want write the data in particular address to Enable (EN_X_Y_Z); //CTRL_REG1 register enable X-axis, Y-axis,Z-axis in normal mode , how we read the data from specific register address? kindly guide me.

CTRL_REG1= 0x20; // Register address

EN_X_Y_Z= 0x27; // Data

how can i write 0x27 data in the CTRL Register1 address location 0x20 ,please tell me

unsigned char reg_buf[5];

buf[0]= 0x30; // write address

buf[0]=0x20; // register address

buf[1]=0x27; // data

write(fd, reg_buf, sizeof(buf)); // for your reference i have attached my program

how we write, read I2C register's Data using system call, kindly help me i am hanging here i am not able to read Accelerometer sensor registers from particular location data , please send sample program.

Re: i am unable to write and read registers from slve Device(Accelometer LIS331DLH)perticular location ?

Pavel — Wed, 08 Aug 2018 03:06:02 GMT

Look at the following pages about using I2C under Linux:

https://www.kernel.org/doc/Documentation/i2c/dev-interface

https://github.com/shenki/linux-i2c-example

https://github.com/ev3dev/i2c-tools

http://www.haifux.org/lectures/258/gpio_spi_i2c_userspace.pdf

Have a great day,
Pavel Chubakov

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Re: i am unable to write and read registers from slve Device(Accelometer LIS331DLH)perticular location ?

Pavel — Wed, 08 Aug 2018 06:07:20 GMT

Look at the following pages:

linux/i2c-smbus.h at master · torvalds/linux · GitHub

c - fatal error: i2c/smbus.h: No such file or directory? - Stack Overflow

c++ - Why are i2c_smbus function not available? (I2C – Embedded Linux) - Stack Overflow

Have a great day,
Pavel Chubakov