libusb and linux
Posted: Fri Nov 29, 2013 9:33 pm
Helo...
I have little ADC working in windows. Now I like to port to linux (raspberry/beaglebone).
ADC act as HID. The working solution is writen in basic. After oppening USB (to get handle) I just repeated read like this
Now for linux I tried python and libusb. After twigling with permissions (dont need to be sudo any more) I can find and open interface based on name, but cant got any data from usb. Any idea?
The as short as possible python test. I tryed many values for request_type and request, but without success.
I have little ADC working in windows. Now I like to port to linux (raspberry/beaglebone).
ADC act as HID. The working solution is writen in basic. After oppening USB (to get handle) I just repeated read like this
Code: Select all
declare function HidD_GetFeature lib "hid.dll" alias "HidD_GetFeature" (hnd As integer,buf As integer,len As integer) As Integer
HidD_GetFeature(HidHandle,buffer,9)Now for linux I tried python and libusb. After twigling with permissions (dont need to be sudo any more) I can find and open interface based on name, but cant got any data from usb. Any idea?
The as short as possible python test. I tryed many values for request_type and request, but without success.
Code: Select all
import usb1
#Try to open my stick - no error checking at all
context = usb1.USBContext()
for device in context.getDeviceList(skip_on_error=True):
if device.getProduct()=='IsolADC':
devh=device.open()
print devh #just print descriptor to see
#now try to get 8 bytes from control point
request_type=0# (1<<5) #HID CLASS
request=0 #1 #GET REPORT
value=0
index=0
length=8
tmp= devh.controlRead(request_type, request, value, index, length,0)
print len(tmp)
print '>',tmp