Getting back to this after some days...
I imagine the difference between I2C mode vs SPI is how it's physically
interfaced to the board.
I believe that my board is connected for I2C.
debian@beaglebone:~$ i2cdetect -r 2
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c-2 using read byte commands.
I will probe address range 0x03-0x77.
Continue? [Y/n] Y
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- UU UU UU UU -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
How do I interpret what I am seeing? The I2C docs don't make much sense to
me.
Thanks
Mike
On Monday, February 29, 2016 at 10:08:38 PM UTC-5, Nuno wrote:
>
> On 02/29/2016 08:28 PM, AV8TOR wrote:
> > Update:
> > I anticipate someone will want to know how the sensor is interfaced:
> > Again, using the BMP085 as a reference for my BMP280
> > The actual BMP280 pinout BMP280 Pinout
> > <
> https://learn.adafruit.com/adafruit-bmp280-barometric-pressure-plus-temperature-sensor-breakout/pinouts>
>
>
> > the below steps snipped from this link: BMP On the Beaglebone Black
> > <http://elinux.org/Beagleboard:BMP_on_the_Beagle_Bone_Black>
> >
> > 1. Connect GND from the BMP085 to P9.1 of your BBB.
> > 2. Connect VIN from the BMP085 to P9.3 of your BBB.
> > 3. Connect SCL from the BMP085 to P9.19 of your BBB.
> > 4. Connect SDA from the BMP085 to P9.20 of your BBB. (NOTE: the BMP280
> > does not have SDA, so I'm using SDI instead)
>
> You might want to make sure that you are using the BMP280 in I2C mode,
> instead of SPI mode, as it supports both.
>
> Before assigning a driver to it (your echo command), you can try to see
> if it's actually being detected on the i2c bus and dump its registers
> using the i2c tools (i2cdetect, i2cdump)
>
> You also didn't mention what linux/kernel versions you are running.
> There's support for BMP280 on newer linux kernels within the kernel iio
> framework as of 2014/2015.
>
> regards,
> Nuno
>
> --
>
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