Input/Output Errors

[ventz]

Installed via apt (version: 0.1.0 of microstacknode) and getting:

python3 /usr/share/doc/python3-microstacknode/examples/accelcat.py

Traceback (most recent call last):
File "/usr/share/doc/python3-microstacknode/examples/accelcat.py", line 8, in
accelerometer.init()
File "/usr/lib/python3/dist-packages/microstacknode/accelerometer/mma8452q.py", line 115, in init
self.standby()
File "/usr/lib/python3/dist-packages/microstacknode/accelerometer/mma8452q.py", line 127, in standby
self.ctrl_reg1.value &= 0xff ^ CTRL_REG1_SET_ACTIVE
File "/usr/lib/python3/dist-packages/microstacknode/accelerometer/mma8452q.py", line 213, in value
v))
File "/usr/lib/python3/dist-packages/microstackcommon/i2c.py", line 85, in transaction
ioctl(self.fd, I2C_RDWR, ioctl_arg)
IOError: [Errno 5] Input/output error

i2c seems to detect:

i2cdetect -y 1

 0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f

00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

Not sure what's causing this?

I also tried the latest version from github, that also has problems. Looking for any help on this.

Thanks.

[ventz]

For the i2cdetect, I noticed that the "right" combination is:

/etc/modules:

snd-bcm2835
i2c-bcm2708
i2c-dev

/etc/modprobe.d/raspi-blacklist.conf

blacklist snd_soc_tas5713
blacklist snd_soc_wm8804

After a reboot, the system no longer ties up those addresses (UU):

i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

But this would indicate that the module is not even picked up?

[tompreston]

Hi, sorry it's taken me so long to get back to you on this.

Jumper 1 sets the address of the board -- can you confirm which pins are connected on JP1 for me, please?

[ventz]

Hi,

JP1 has the jumper on top (both pins - default, i think ot came that way).

This means it should be powered through the Pi and that it should not be powered through the board right?

I think i also tried at one point removing that and powering the board directly just to eliminate that as an issue.

Checking with a multimeter, the pins (board) are definitely getting the 3v.

[thomasmacpherson]

Hi ventz,

Sorry, Tom meant Jumper 1 on the Accelerometer board. If possible could you take a picture of your board.

Thanks

[ventz]

Hi Thomas, Tom,

I'll take a few pictures and provide links later today (I don't have it with me).

For now, just to confirm -- we are talking about this part: http://www.element14.com/community/dtss-images/uploads/devtool/image/large/14e432dbc220d33f208504aec8cd50f8.png

It was my understanding that the data (x,y,z axis) is provided via the built-in pins back through the board, to the PI -- you don't need to manually connect any pins to JP1/solder wires right?

[ventz]

Here are two pictures from two different angles:

http://vpetkov.net/pic1.jpg
and
http://vpetkov.net/pic2.jpg

[ventz]

Just wanted to see if you were able to figure out what is causing this? I poked at it a bit more, but it looks to me like the accelerometer module is just not communicating at all. I don't have access to an oscilloscope in order to get more information.

[mcurtis789]

i am getting the same error. based off the above statement was there just bad batch of devices or is there some extra configurations that are needed?
python3 /usr/share/doc/python3-microstacknode/examples/accelcat.py
Traceback (most recent call last):
File "/usr/share/doc/python3-microstacknode/examples/accelcat.py", line 8, in
accelerometer.init()
File "/usr/lib/python3/dist-packages/microstacknode/accelerometer/mma8452q.py", line 115, in init
self.standby()
File "/usr/lib/python3/dist-packages/microstacknode/accelerometer/mma8452q.py", line 127, in standby
self.ctrl_reg1.value &= 0xff ^ CTRL_REG1_SET_ACTIVE
File "/usr/lib/python3/dist-packages/microstacknode/accelerometer/mma8452q.py", line 213, in value
v))
File "/usr/lib/python3/dist-packages/microstackcommon/i2c.py", line 85, in transaction
ioctl(self.fd, I2C_RDWR, ioctl_arg)
IOError: [Errno 5] Input/output error

sudo i2cdetect -y -q 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

[mcurtis789]

so i disabled device tree now i get this
i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

[tompreston]

Hi, sorry for the delay. It appears there has been a manufacturing fault on a couple of units -- you are missing the header pins for JP1 on your accelerometer. Fortunately you can fix this by connecting pins 2 and 3 under label JP1:

Alternatively, PM me and we can arrange to send you a working unit. Our apologies for any inconvenience this may have caused you.

[rob-barnes]

"It appears there has been a manufacturing fault on a couple of units"
I guess I'm the poor sob who got the other one!! It took quite a while to find this fix!!
Might I suggest an edit to this: http://www.farnell.com/datasheets/1860445.pdf
such that users are directed to add these lines are added to /etc/modules:
i2c-bcm2708
i2c-dev

[Mattat01]

Tompreston, thanks. Finally I know why mine wasn't working! There are a handful of reports of this problem that could benefit from this information. I've just used a staple to jump JP1-3 to JP1-2. Is there a more permanent and simple solution?

[erwanleguillou]

I got the same problem, I soldered a wire between pins 2 and 3, and now it works!!! Thanks Tom.

[rogloh]

Another one here with the same fault - no jumper between pins 2 and 3. Just purchased from element14 in Australia too. Lucky I found this and was able to add the jumper - accelerometer now working.

[tompreston]

I'm going to close this since we know what the issue is and how to fix it.