attributeError: 'module' object has no attribute 'USBISS'

[Zanati123]

• pyusbiss version: 0.1.2
• Python version: 3.4.2
• Operating System: Raspbian

### Description

Hey Dancing Quanta,
Following your patch to pyusbiss, establishing communication to a alphasense OPC is greeted by an error: attributeError: 'module' object has no attribute 'USBISS'.

This is using dhhagan's sample script from py-opc to connect the sensor to Rpi via USB interface, line 5: s_pi = usbiss.USBISS("/dev/ttyACM0", "spi", spi_mode=1, freq=500000)_

Looking into the script of usbiss.py, i am unsure how to adjust to make the class USBISS work. Would you have any advice?

Thank you,
Zanati123

### What I Did

• Factory reset Raspian and updated all
• Downloaded and installed py-opc & pyusbiss
• Using python 3.4.2, copied dhhagan's sample script to connect sensor via USB interface.
• Error in spi = usbiss.USBISS("/dev/ttyACM0", "spi", spi_mode=1, freq=500000), error message attributeError: 'module' object has no attribute 'USBISS'

```import usbiss
import opc

# Build the connector
spi = usbiss.USBISS("/dev/ttyACM0", "spi", spi_mode=1, freq=500000)

alpha = opc.OPCN2(spi)

# Turn on the device
alpha.on()

# Read the histogram
alpha.histogram()

# Turn the device off
alpha.off()

-------------------------------------------------
>>>Traceback (most recent call last):
  File "/home/pi/test1.py", line 5, in <module>
    spi = usbiss.USBISS("/dev/ttyACM0", "spi", spi_mode=1, freq=500000)
AttributeError: 'module' object has no attribute 'USBISS'

[Zanati123]

As fixed with your recent commit "Updated README.md for pyusbiss 0.2.0" in dhhagan/py-opc

The script was updated to:

from usbiss.spi import SPI
import opc

##Build the connector
spi = SPI("/dev/ttyACM0")

##Set the SPI mode and clock speed
spi.mode = 1
spi.max_speed_hz = 500000

alpha = opc.OPCN2(spi)

##Turn on the device
alpha.on()

##Read the histogram
alpha.histogram()

##Turn the device off
alpha.off()

But an error returns as:

>>> Traceback (most recent call last):
  File "/home/pi/test1.py", line 11, in <module>
    alpha = opc.OPCN2(spi)
  File "/home/pi/opc/__init__.py", line 238, in __init__
    super(OPCN2, self).__init__(spi_connection, model='N2', **kwargs)
  File "/home/pi/opc/__init__.py", line 50, in __init__
    assert self.cnxn.mode == 1, "SPI mode must be 1"
AssertionError: SPI mode must be 1
>>> 

I set the SPI mode to 1 but it shows an error that i haven't, any suggestions?

Regards,
Zanati123

[DancingQuanta]

HI, thanks for trying. I have pushed a fix. The repo is undergoing a major change and so not sure how stable it is. If the latest fix works for you then I will release a version 0.2.0.
The stable version is v0.1.2 here https://github.com/DancingQuanta/pyusbiss/releases/tag/v0.1.2 where you use usbiss.USBISS.

[DancingQuanta]

I have made a release 0.2.0. Please install via pip install pyusbiss and close this issue if it works for you.

[DancingQuanta]

The library have advanced to 0.2.2.