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remote: usb: print "access denied" error

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When we get an error with errno 13, it means that the user doesn't
have access to the USB device.  Rather than silently eating this
error and returning -1, print out a message to aid in debugging.

Signed-off-by: Sean Cross <sean@xobs.io>
This commit is contained in:
Sean Cross 2019-05-21 02:35:09 +01:00
parent faf6554c89
commit 014c950580
1 changed files with 12 additions and 3 deletions
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15
litex/tools/remote/comm_usb.py
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@ -111,7 +111,14 @@ class CommUSB:
if value is None:
raise TypeError
return int.from_bytes(value, byteorder="little")
except (usb.core.USBError, TypeError):
except usb.core.USBError as e:
if e.errno == 13:
print("Access Denied. Maybe try using sudo?")
self.close()
self.open()
if depth < self.MAX_RECURSION_COUNT:
return self.usb_read(addr, depth+1)
except TypeError:
self.close()
self.open()
if depth < self.MAX_RECURSION_COUNT:
@ -127,7 +134,7 @@ class CommUSB:
def usb_write(self, addr, value, depth=0):
try:
self.dev.ctrl_transfer(bmRequestType=0x43, bRequest=0x00,
value = self.dev.ctrl_transfer(bmRequestType=0x43, bRequest=0x00,
wValue=addr & 0xffff,
wIndex=(addr >> 16) & 0xffff,
data_or_wLength=bytes([(value >> 0) & 0xff,
@ -135,7 +142,9 @@ class CommUSB:
(value >> 16) & 0xff,
(value >> 24) & 0xff]
), timeout=None)
except usb.core.USBError:
except usb.core.USBError as e:
if e.errno == 13:
print("Access Denied. Maybe try using sudo?")
self.close()
self.open()
if depth < self.MAX_RECURSION_COUNT: