On Sun, 29 Oct 2017, Stephen Graf wrote:
Date: Sun, 29 Oct 2017 22:43:44 -0700
From: Stephen Graf <s_g...@telus.net>
To: artturi....@gmail.com, arm@openbsd.org
Subject: problem connecting two BME280 sensors
Hi Artturi,
Now that I have a working NIC on my orangepi one, I turned my attention back
to the BME280 sensors. I put a second sensor on the system, this time on
the i2c0 bus and changed the dtb to what is included below. My first
question is, does the dtb look ok?
I am having some difficulties. When both sensors are connected the first
sensor works, but the second gets an error reading the calibration
registers. If I disconnect the first sensor, the second sensor works.
Stephen,
Am I mistaken, or are both the bme0 and bme1 sharing the same i2c address
(0x76) on the same bus? Perhaps there are jumpers to change the address
of the second sensor to a different address??
Just wondering ...
Cheers,
Rob Sciuk
Both sensors connected:
# tail -100 /var/log/messages
...
Oct 29 22:16:42 openbsdop1 /bsd: sxitwi0 at simplebus0
Oct 29 22:16:42 openbsdop1 /bsd: iic0 at sxitwi0
Oct 29 22:16:42 openbsdop1 /bsd: bme0 at iic0 addr 0x76: BME280 60
Oct 29 22:16:42 openbsdop1 /bsd: sxitwi1 at simplebus0
Oct 29 22:16:42 openbsdop1 /bsd: iic1 at sxitwi1
Oct 29 22:16:42 openbsdop1 /bsd: bme1 at iic1 addr 0x76: BME280 60: failed
to read calib24 register
Oct 29 22:16:42 openbsdop1 /bsd: sxitwi2 at simplebus0
Oct 29 22:16:42 openbsdop1 /bsd: iic2 at sxitwi2
# sysctl hw.sensors
hw.sensors.bme0.temp0=21.02 degC
hw.sensors.bme0.humidity0=55.40%
hw.sensors.bme0.pressure0=101.44 Pa
Only second sensor connected:
# tail -100 /var/log/messages
...
Oct 29 22:21:39 openbsdop1 /bsd: sxitwi0 at simplebus0
Oct 29 22:21:39 openbsdop1 /bsd: iic0 at sxitwi0
Oct 29 22:21:39 openbsdop1 /bsd: bme0 at iic0 addr 0x76: cannot read ID
register
Oct 29 22:21:39 openbsdop1 /bsd: sxitwi1 at simplebus0
Oct 29 22:21:39 openbsdop1 /bsd: iic1 at sxitwi1
Oct 29 22:21:39 openbsdop1 /bsd: bme1 at iic1 addr 0x76: BME280 60
Oct 29 22:21:39 openbsdop1 /bsd: sxitwi2 at simplebus0
Oct 29 22:21:39 openbsdop1 /bsd: iic2 at sxitwi2
# sysctl hw.sensors
hw.sensors.bme1.temp0=21.64 degC
hw.sensors.bme1.humidity0=50.11%
hw.sensors.bme1.pressure0=101.41 Pa
Section of DTB with i2c:
i2c@01c2ac00 {
compatible = "allwinner,sun6i-a31-i2c";
reg = <0x1c2ac00 0x400>;
interrupts = <0x0 0x6 0x4>;
clocks = <0x2 0x3b>;
resets = <0x2 0x2e>;
pinctrl-names = "default";
pinctrl-0 = <0x13>;
status = "okay";
#address-cells = <0x1>;
#size-cells = <0x0>;
bme@0 {
reg = <0x76>;
interrupts = <0x0>;
compatible = "bosch,bme280";
};
};
i2c@01c2b000 {
compatible = "allwinner,sun6i-a31-i2c";
reg = <0x1c2b000 0x400>;
interrupts = <0x0 0x7 0x4>;
clocks = <0x2 0x3c>;
resets = <0x2 0x2f>;
pinctrl-names = "default";
pinctrl-0 = <0x14>;
status = "okay";
#address-cells = <0x1>;
#size-cells = <0x0>;
bme@1 {
reg = <0x76>;
interrupts = <0x0>;
compatible = "bosch,bme280";
};
};
i2c@01c2b400 {
compatible = "allwinner,sun6i-a31-i2c";
reg = <0x1c2b400 0x400>;
interrupts = <0x0 0x8 0x4>;
clocks = <0x2 0x3d>;
resets = <0x2 0x30>;
pinctrl-names = "default";
pinctrl-0 = <0x15>;
status = "okay";
#address-cells = <0x1>;
#size-cells = <0x0>;
};
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Robert Sciuk
r...@controlq.com
97 Village Rd.
289.312.1278
Wellesley, ON. N0B 2T0
