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fuses.py
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fuses.py
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#!/usr/bin/env python3
# Internal 8MHz: E:FF, H:D9, L:D2
# Master (ext 8-20Mhz, ckout): E:FF, H:D9, L:BE
# IO (ext clock): E:FF, H:D9, L:D0
import sys
import collections
class Byte:
def __init__(self, name):
self.name = name
self.bit_occupations = [None] * 8
self.values = collections.OrderedDict()
def register_value(self, value):
for i, bit in enumerate(value.bits):
if self.bit_occupations[bit] is not None:
raise Exception("Bit %i of %s used by %s and %s." % (i, self.name, self.bit_occupations[bit].name, value.name))
self.bit_occupations[bit] = value
if value.name in self.values:
raise Exception("Value called %s already registered in %s" % (value.name, self.name))
self.values[value.name] = value
def check(self, num):
if num < 0 or num > 7:
raise Exception("Illegal bit number %i" % num)
def applied_bits(self):
bits = [False] * 8
for v in self.values.values():
v.apply(bits)
return bits
def applied_value(self):
bits = self.applied_bits()
num = 0xFF
for i, bit in enumerate(bits):
if bit:
num -= 1 << i
return num
def applied_hex(self):
num = self.applied_value()
return "%02x" % num
def __str__(self):
s = "%s: " % self.name
for i in range(7, -1, -1):
val = self.bit_occupations[i]
if val is None:
s += "[%i: -]" % i
else:
s += "[%i: %s] " % (i, val.name)
return s
class Value:
def __init__(self, name, bits, values, default_value):
self.name = name
self.bits = bits
self.values = collections.OrderedDict(values)
self.current_value = default_value
if default_value not in self.values:
raise Exception("Default value '%s' not in values: %s" % (default_value, list(self.values.keys())))
@staticmethod
def bool_value(name, bit_num, default=False):
return Value(name, [bit_num],
[
("off", [0]),
("on", [1])
], "on" if default else "off" )
def set_value(self, value):
if value not in self.values:
raise Exception("Unkown value for %s: %s. Possible values: %s" % (self.name, value, self.values.keys()))
self.current_value = value
def apply(self, bits):
val = self.values[self.current_value]
if len(val) != len(self.bits):
raise Exception("Wrong number of bits for value %s of %s." % (self.current_value, self.name))
for i in range(len(val)):
bitnum = self.bits[i]
if val[i] == 1:
bits[bitnum] = True
elif val[i] == 0:
bits[bitnum] = False
else:
raise Exception("Bit values must be 0/1. In %s of %s." % (self.current_value, self.name))
def __str__(self):
vals = list(self.values.keys())
for i in range(len(vals)):
if vals[i] == self.current_value:
vals[i] = "[%s]" % vals[i]
return "%s: %s" % (self.name, ', '.join(vals))
def m1284P_bytes(clock_type):
lock = Byte("lock")
lock.register_value(Value("LB", [1, 0],
[
("NO_LOCK", [0, 0]),
("PROG_DISABLED", [0, 1]),
("PROG_VER_DISABLED", [1, 1])
],
"NO_LOCK"))
lock.register_value(Value("BLB0", [3, 2],
[
("NO_LOCK", [0, 0]),
("SPM_DISABLE", [0, 1]),
("SPM_LPM_DISABLE", [1, 1]),
("LPM_DISABLE", [1, 0])
],
"NO_LOCK"))
lock.register_value(Value("BLB1", [5, 4],
[
("NO_LOCK", [0, 0]),
("SPM_DISABLE", [0, 1]),
("SPM_LPM_DISABLE", [1, 1]),
("LPM_DISABLE", [1, 0])
],
"NO_LOCK"))
efuse = Byte("efuse")
efuse.register_value(Value("BODLEVEL", [2, 1, 0],
[
("DISABLED", [0, 0, 0]),
("1.7V", [0, 0, 1]),
("2.5V", [0, 1, 0]),
("4.1V", [0, 1, 1])
],
"DISABLED"))
hfuse = Byte("hfuse")
hfuse.register_value(Value.bool_value("OCDEN", 7))
hfuse.register_value(Value.bool_value("JTAGEN", 6))
hfuse.register_value(Value.bool_value("SPIEN", 5, default=True))
hfuse.register_value(Value.bool_value("WDTON", 4))
hfuse.register_value(Value.bool_value("EESAVE", 3))
hfuse.register_value(Value("BOOTSZ", [2, 1],
[
(".5K", [0, 0]),
("1K", [0, 1]),
("2K", [1, 0]),
("4K", [1, 1]),
],
"4K"))
hfuse.register_value(Value.bool_value("BOOTRST", 0))
lfuse = Byte("lfuse")
lfuse.register_value(Value.bool_value("CKDIV8", 7))
lfuse.register_value(Value.bool_value("CKOUT", 6))
if clock_type == "external":
lfuse.register_value(Value("START_UP_TIME", [5, 4, 0],
[
("258 ck + 4.1 ms", [1, 1, 1]),
("258 ck + 65 ms", [1, 0, 1]),
("1k ck + 0 ms", [0, 1, 1]),
("1k ck + 4.1 ms", [0, 0, 1]),
("1k ck + 65 ms", [1, 1, 0]),
("16k ck + 0 ms", [1, 0, 0]),
("16k ck + 4.1 ms", [0, 1, 0]),
("16k ck + 65 ms", [0, 0, 0])
],
"16k ck + 65 ms"))
lfuse.register_value(Value("CLOCK_SELECT", [3, 2, 1],
[
("low-power (0.4 - 0.9 MHz)", [0, 1, 1]),
("low-power (0.9 - 3.0 MHz)", [0, 1, 0]),
("low-power (3.0 - 8.0 MHz)", [0, 0, 1]),
("low-power (8.0 - 16.0 MHz)", [0, 0, 0]),
("full-swing (0.4 - 20.0 MHz)", [1, 0, 0]),
],
"full-swing (0.4 - 20.0 MHz)"))
elif clock_type == "external_low_frequency":
lfuse.register_value(Value("START_UP_TIME", [5, 4, 0],
[
("1k ck + 0 ms", [1, 1, 1]),
("1k ck + 4.1 ms", [1, 0, 1]),
("1k ck + 65 ms", [0, 1, 1]),
("32k ck + 0 ms", [1, 1, 0]),
("32k ck + 4.1 ms", [1, 0, 0]),
("32k ck + 65 ms", [0, 1, 0]),
],
"32k ck + 65 ms"))
lfuse.register_value(Value("CLOCK_SELECT", [3, 2, 1],
[
("low-frequency", [0, 1, 1]),
],
"low-frequency"))
elif clock_type == "other":
lfuse.register_value(Value("START_UP_TIME", [5, 4],
[
("6 ck + 0 ms", [1, 1]),
("6 ck + 4.1 ms", [1, 0]),
("6 ck + 65 ms", [0, 1]),
],
"6 ck + 65 ms"))
lfuse.register_value(Value("CLOCK_SELECT", [3, 2, 1, 0],
[
("internal 8 MHz", [1, 1, 0, 1]),
("internal 128 kHz", [1, 1, 0, 0]),
("external", [1, 1, 1, 1]),
],
"internal 8 MHz"))
else:
raise Exception("Illegal clock type %s" % clock_type)
return collections.OrderedDict([ (a.name, a) for a in [ efuse, hfuse, lfuse, lock ] ])
def main(argv):
settings = {}
for a in argv:
s = a.split("=")
if len(s) != 2:
raise Exception("allowed parameters: <key>=<value>")
settings[s[0]] = s[1]
clock_type = settings["clock_type"] if "clock_type" in settings else "other"
bytes = m1284P_bytes(clock_type)
if "clock_type" in settings: del settings["clock_type"]
for b in bytes.values(): print("%s" % b)
print('')
values = collections.OrderedDict()
for b in bytes.values():
for v in b.values.values():
values[v.name] = v
for k, v in settings.items():
if k not in values:
raise Exception("Unkown value name: %s" % k)
values[k].set_value(v)
print(Value('clock_type', None, [('other', None), ('external', None), ('external_low_frequency', None)], clock_type))
for value in values.values(): print(value)
print('')
for b in bytes.values():
print("%s: %s" % (b.name, b.applied_hex()))
print("avrdude -P usb -c usbasp -p atmega1284p " + " ".join(["-U %s:w:%d:m" % (b.name, b.applied_value()) for b in bytes.values()]))
if __name__ == "__main__":
main(sys.argv[1:])