Problem in writing data to a register of my bmp388 sensor using I2C.

[Vraj Joshi]

I am facing an issue in writing data to a register of my bmp388 sensor using I2C.

If I fill my transmit buffer of 2 bytes in following way , tx_buf[] = {register_address , value}, where both are of uint8_t data types then register address is taken properly but in case of value only half byte is transmitted. 

Can you please help me with my problem?

Thanks in advance.

[Karl Ylvisaker]

Hello,

register address is taken properly but in case of value only half byte is transmitted. 

That sounds very strange. Do you have access to a logic analyzer, so we may see what is actually happening on the pins?
Seeing a logic analyzer trace of the communication would be very helpful.

If not; how have you verified that only half the value byte is being written to the slave?
It is not really an option of the SPI protocol to send half a byte, so I do not see this happening without an error being returned.
It would be helpful if you could share the code for this as well, so I may have a look.

Looking forward to resolving this issue together!

Best regards,
Karl 

[awneil]

Karl Ylvisaker said:

It is not really an option of the SPI protocol to send half a byte

Nor for I2C

[Karl Ylvisaker]

Keenly spotted, @awneil! :D 
Thanks for supplementing the answer, and actually making it relevant for the original question :p

Best regards,
Karl