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Merge pull request #183 from xobs/usb-to-0x43 

Use 0x43/0xc3 for USB bridge magic packet
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enjoy-digital 2019-05-21 07:19:15 +02:00 committed by GitHub
parent 10670e22ac 014c950580
commit 3a72688b28
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 8 deletions
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25
litex/tools/remote/comm_usb.py
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@ -20,12 +20,12 @@ import time
# The SETUP packet looks like this:
#
# +----+----+----------+----+----+
# | C0 | 00 | ADDRESS | 04 | 00 | read packet
# | C3 | 00 | ADDRESS | 04 | 00 | read packet
# +----+----+----------+----+----+
# 1 1 4 1 1
#
# +----+----+----------+----+----+
# | 40 | 00 | ADDRESS | 04 | 00 | write packet
# | 43 | 00 | ADDRESS | 04 | 00 | write packet
# +----+----+----------+----+----+
# 1 1 4 1 1
#
@ -37,8 +37,8 @@ import time
# byte indicates what type of packet it is, and that it is a Wishbone Bridge
# packet. This is the value "0x40" (VENDOR type packet destined for DEVICE)
# with the "Data Phase Transfer" bit either set or cleared:
# - Read: 0xc0
# - Write: 0x40
# - Read: 0xc3
# - Write: 0x43
#
# The next byte is bRequest, which in the current implementation is unused.
# Set this value to 0.
@ -103,7 +103,7 @@ class CommUSB:
def usb_read(self, addr, depth=0):
try:
value = self.dev.ctrl_transfer(bmRequestType=0xc0,
value = self.dev.ctrl_transfer(bmRequestType=0xc3,
bRequest=0x00,
wValue=addr & 0xffff,
wIndex=(addr >> 16) & 0xffff,
@ -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=0x40, 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: