litex/miscope/host/regs.py

48 lines
1.2 KiB
Python

import csv
class MappedReg:
def __init__(self, readfn, writefn, name, addr, length, mode):
self.readfn = readfn
self.writefn = writefn
self.addr = addr
self.length = length
self.mode = mode
def read(self):
if self.mode not in ["rw", "ro"]:
raise KeyError(name + "register not readable")
r = 0
for i in range(self.length):
r |= self.readfn(self.addr + 4*i)
if i != (self.length-1):
r <<= 8
return r
def write(self, value):
if self.mode not in ["rw", "wo"]:
raise KeyError(name + "register not writable")
for i in range(self.length):
dat = (value >> ((self.length-1-i)*8)) & 0xff
self.writefn(self.addr + 4*i, dat)
class MappedRegs:
def __init__(self, d):
self.d = d
def __getattr__(self, attr):
try:
return self.__dict__['d'][attr]
except KeyError:
pass
raise KeyError("No such register " + attr)
def build_map(addrmap, readfn, writefn):
csv_reader = csv.reader(open(addrmap), delimiter=',', quotechar='#')
d = {}
for item in csv_reader:
name, addr, length, mode = item
addr = int(addr.replace("0x", ""), 16)
length = int(length)
d[name] = MappedReg(readfn, writefn, name, addr, length, mode)
return MappedRegs(d)