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Motor Bridge Cape v1.0 - IOError: [Errno 121] Remote I/O error

Posted: Wed Nov 28, 2018 4:18 am
by msenko
Hi There,
I am having a trouble with Motor Bridge Cape v1.0 communication ( I think).
Running StepperMotortest.py demo file I get this message:

Hello From MotorBridge
Traceback (most recent call last):
File "/var/lib/cloud9/MotorBridgeCapeforBBG_BBB/tests/StepperMotortest.py", line 56, in <module>
StepperMotorBTest()
File "/var/lib/cloud9/MotorBridgeCapeforBBG_BBB/tests/StepperMotortest.py", line 45, in StepperMotorBTest
motor.StepperMotorBInit()
File "/var/lib/cloud9/MotorBridgeCapeforBBG_BBB/tests/MotorBridge.py", line 256, in StepperMotorBInit
WriteByte(TB_2A_MODE,TB_SPM) #Stepper
File "/var/lib/cloud9/MotorBridgeCapeforBBG_BBB/tests/MotorBridge.py", line 205, in WriteByte
MotorBridge.writeList(WriteMode,data)
File "/usr/local/lib/python2.7/dist-packages/Adafruit_GPIO/I2C.py", line 127, in writeList
self._bus.write_i2c_block_data(self._address, register, data)
File "/usr/local/lib/python2.7/dist-packages/Adafruit_PureIO/smbus.py", line 294, in write_i2c_block_data
self._device.write(data)
IOError: [Errno 121] Remote I/O error

Earlier I successfully was able to update the firmware. but I still can't see the cape address
root@beaglebone:/var/lib/cloud9# i2cdetect -y -r 2
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: -- -- -- -- -- -- -- --
root@beaglebone:/var/lib/cloud9# i2cdetect -y -r 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: -- -- -- -- -- -- -- --

I am running:
Linux beaglebone 4.4.91-ti-r141 #1 SMP Fri Dec 22 10:35:15 UTC 2017 armv7l GNU/Linux
Python 2.7.9

Cape connected to external power supply 12V, checked P9_23 is high (3.3V),
Please point me in the right direction,
Thank you,

Michael

Re: Motor Bridge Cape v1.0 - IOError: [Errno 121] Remote I/O error

Posted: Thu Nov 29, 2018 5:37 pm
by bill.yu
Hi Michael,

I tested it with below steps and the bbg can detect the board. please try to use the latest image and test it again. thanks.

1. install dependencies

sudo apt-get update
sudo apt-get install build-essential python-pip python-dev python-smbus git -y
sudo pip install Adafruit-GPIO
sudo pip install Adafruit_BBIO
sudo pip install pyserial

2. Run sudo nano /boot/uEnv.txt and then add below 2 lines at bottom of the uEnv.txt.
Copied to clipboard
uboot_overlay_addr0=/lib/firmware/BB-UART2-00A0.dtbo
enable_uboot_cape_universal=1

3. update the firmware
git clone https://github.com/Seeed-Studio/MotorBridgeCapeFirmware
cd MotorBridgeCapeFirmware
sudo make flash

4. run the i2cdetect -y -r 2

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


5. debian version:

debian@beaglebone:~$ uname -a
Linux beaglebone 4.14.49-ti-r54 #1 SMP PREEMPT Fri Jun 15 22:14:13 UTC 2018 armv7l GNU/Linux

Re: Motor Bridge Cape v1.0 - IOError: [Errno 121] Remote I/O error

Posted: Fri Feb 01, 2019 10:33 pm
by msenko
Thanks Bill,
Followed all instruction, still no luck.
Finally, my coworker figured out and manage to communicate with the Motor Bridge Cape by disabling HDMI and Audio outputs on BBB.

Thank you,
Michael