RE: Getting the Adafruit_I2C Import Changed Into Another GPIO Layout

I have some problems with the MotorBridgeCape. I have all my software and I found most of it at GitHub.com at github.com/Seeed-Studio/MotorBridgeCapeforBBG_BBB and at their Wiki at seeedstudio.com/wiki/Motor_Bridge_Cape_v1.0.

Here is my issue. I connect my battery, two motors, and I run the .py file for DC Motors from their Wiki page. I get an error. The error reads as follows: •Error accessing 0x4B: Check your I2C address

I checked online at their site. The seeedstudio.com site, in the forum section, stated that in 2014 there was an addressed answer. This answer was to update the firmware. I go into my BBB/BBG with the MotorBridgeCape attached and I download the .zip file and then unzip it.

The update to the firmware is as follows:

1.Connect cape to your BBG/BBB, download http://www.seeedstudio.com/wiki/images/ ... e_v1.0.zip to your BBG/BBB
2.unzip the file
3.Go to the directory Motor Bridge Cape V1.0 (cd Motor Bridge Cape V1.0)
4.upload firmware (make flash_firmware)

Once I unzip the .zip file, I get a “directory.” The directory is listed as Motor Bridge Cape v1.0. I have no underscores in the file/directory.

So, it is not listed as Motor_Bridge_Cape_v1.0 and I cannot move to that file/directory. So, I used “” to move to that directory.

So, I get to the directory stated and I use “make flash_Firmware”. That gets me errors, too.

Here is the code for the MotorBridgeCapeforBBG_BBB:

https://github.com/Seeed-Studio/MotorBridgeCapeforBBG_BBB/blob/master/BBG_MotorBridgeCape/MotorBridge.py

Please see:

from Adafruit_I2C import Adafruit_I2C 
import Adafruit_BBIO.GPIO as GPIO 
import time 
Reset = "P9_23" 
MotorBridge = Adafruit_I2C(0x4b) 
GPIO.setup(Reset, GPIO.OUT) 


ReadMode  = 0 
WriteMode = 1 
DeAddr    = 0X4B 
ConfigValid =  0x3a6fb67c 
DelayTime = 0.005

This software above uses the Adafruit_I2C. Is there a way to change Adafruit_I2C to another “import” of GPIOs that does not have a bug?

The I2C import from Adafruit has a bug in it. If I can change the I2C import to import other GPIOs, like GPIO_46 and so on, I should be able to use the MotorBridgeCapeforBBG_BBB in my current code to make things go.

Please see: import MotorBridge import time

MotorName        = 1
ClockWise        = 1
CounterClockWise = 2
PwmDuty          = 90
Frequency        = 1000

if __name__=="__main__":
    motor = MotorBridge.MotorBridgeCape()
    motor.DCMotorInit(MotorName,Frequency)
    while True:
        motor.DCMotorMove(MotorName,ClockWise,PwmDuty)
        time.sleep(2)
        motor.DCMotorMove(MotorName,CounterClockWise,PwmDuty)
        time.sleep(2)
        print "hello"
        motor.DCMotorStop(MotorName)
        time.sleep(2)

Seth

P.S. Any recommendations would be very helpful.

Answer

I changed the line

MotorBridge = Adafruit_I2C(0x4b)

MotorBridge = Adafruit_I2C(0x4b,2)

and it worked for me. Also make sure you have python-smbus installed. See this webpage for more information.

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Answer