BME280 sensor reading data

[sairfan1]

I'm writing code for PIC mcu to read sonsor BME280 through SPI (for some reason I can't use I2C) I read the datasheet and here is what I understand to read sensor.

To start onversion through Forced mode I send 0x74 which is ctrl_meas register address I send values 0x25 that means x1 oversample for temp and x1 oversampling for pressure and bit [0] 1 to set force mode

Then I delay for 20ms to let conversion completed and data registers are loaded
I send 0xF7 to read first data register and keep reading until 0xFE
In response I alway get same the values for temp, hum, pres

I want to know am I doing right to initialize the sensor? I'm sorry I do not have code with me at this time I will post later,

 

[KlausST]

Hi,

There may be wiring mistakes, timing mistakes (CS), there may be coding mistakes....


Textual description isn't clear.
Please:
* give a link to the datasheet (directly at the manufacturer site)
* show your schematic (hand drawn is O.K.)
* show your code
* tell us what you expect
* tell us what you get instead

Klaus

 

[danadakk]

If you have an Arduino board laying around there are several projects
on web you could look at data traffic with it to confirm what interface
looks like.

Regards, Dana.

 

[sairfan1]

Thanks guys, I will put further information, by saying that I want to know if I'm sending correct commands to initialize the sensor I meant rest of things like communication, timing, code etc I have checked and they look good, but I understand still you can get some cllue there. I will attach the datasheet to the post.

--- Updated Sep 29, 2023 ---

BME280 datasheet attached.