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micropython/ports/stm32/make-stmconst.py

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"""
This script reads in the given CMSIS device include file (eg stm32f405xx.h),
extracts relevant peripheral constants, and creates qstrs, mpz's and constants
for the stm module.
"""
from __future__ import print_function
import argparse
import re
# Python 2/3 compatibility
import platform
if platform.python_version_tuple()[0] == "2":
def convert_bytes_to_str(b):
return b
elif platform.python_version_tuple()[0] == "3":
def convert_bytes_to_str(b):
try:
return str(b, "utf8")
except ValueError:
# some files have invalid utf8 bytes, so filter them out
return "".join(chr(l) for l in b if l <= 126)
# end compatibility code
# given a list of (name,regex) pairs, find the first one that matches the given line
def re_match_first(regexs, line):
for name, regex in regexs:
match = re.match(regex, line)
if match:
return name, match
return None, None
class LexerError(Exception):
def __init__(self, line):
self.line = line
class Lexer:
re_io_reg = r"__IO uint(?P<bits>8|16|32)_t +(?P<reg>[A-Z0-9]+)"
re_comment = r"(?P<comment>[A-Za-z0-9 \-/_()&:\[\]]+)"
re_addr_offset = r"Address offset: (?P<offset>0x[0-9A-Z]{2,3})"
regexs = (
(
"#define hex",
re.compile(
r"#define +(?P<id>[A-Z0-9_]+) +\(?(\(uint32_t\))?(?P<hex>0x[0-9A-F]+)U?L?\)?($| */\*)"
),
),
("#define X", re.compile(r"#define +(?P<id>[A-Z0-9_]+) +(?P<id2>[A-Z0-9_]+)($| +/\*)")),
(
"#define X+hex",
re.compile(
r"#define +(?P<id>[A-Za-z0-9_]+) +\(?(?P<id2>[A-Z0-9_]+) \+ (?P<hex>0x[0-9A-F]+)U?L?\)?($| +/\*)"
),
),
(
"#define typedef",
re.compile(
r"#define +(?P<id>[A-Z0-9_]+(ext)?) +\(\([A-Za-z0-9_]+_(Global)?TypeDef \*\) (?P<id2>[A-Za-z0-9_]+)\)($| +/\*)"
),
),
("typedef struct", re.compile(r"typedef struct$")),
("{", re.compile(r"{$")),
("}", re.compile(r"}$")),
(
"} _t",
re.compile(r"} *([A-Za-z0-9_]+)_t;$"),
),
(
"} TypeDef",
re.compile(r"} *(?P<id>[A-Z][A-Za-z0-9_]*)_(?P<global>([A-Za-z0-9_]+)?)TypeDef;$"),
),
(
"IO reg",
re.compile(
re_io_reg + r" *; */\*!< *" + re_comment + r",? +" + re_addr_offset + r" *\*/"
),
),
(
"IO reg array",
re.compile(
re_io_reg
+ r"\[(?P<array>[2-8])\] *; */\*!< *"
+ re_comment
+ r",? +"
+ re_addr_offset
+ r"-(0x[0-9A-Z]{2,3}) *\*/"
),
),
)
def __init__(self, filename):
self.file = open(filename, "rb")
self.line_number = 0
def next_match(self, strictly_next=False):
while True:
line = self.file.readline()
line = convert_bytes_to_str(line)
self.line_number += 1
if len(line) == 0:
return ("EOF", None)
match = re_match_first(Lexer.regexs, line.strip())
if strictly_next or match[0] is not None:
return match
def must_match(self, kind):
match = self.next_match(strictly_next=True)
if match[0] != kind:
raise LexerError(self.line_number)
return match
def parse_file(filename):
lexer = Lexer(filename)
reg_defs = {}
consts = {}
periphs = []
while True:
m = lexer.next_match()
if m[0] == "EOF":
break
elif m[0] == "#define hex":
d = m[1].groupdict()
consts[d["id"]] = int(d["hex"], base=16)
elif m[0] == "#define X":
d = m[1].groupdict()
if d["id2"] in consts:
consts[d["id"]] = consts[d["id2"]]
elif m[0] == "#define X+hex":
d = m[1].groupdict()
if d["id2"] in consts:
consts[d["id"]] = consts[d["id2"]] + int(d["hex"], base=16)
elif m[0] == "#define typedef":
d = m[1].groupdict()
if d["id2"] in consts:
periphs.append((d["id"], consts[d["id2"]]))
elif m[0] == "typedef struct":
lexer.must_match("{")
m = lexer.next_match()
regs = []
while m[0] in ("IO reg", "IO reg array"):
d = m[1].groupdict()
reg = d["reg"]
offset = int(d["offset"], base=16)
bits = int(d["bits"])
comment = d["comment"]
if m[0] == "IO reg":
regs.append((reg, offset, bits, comment))
else:
for i in range(int(d["array"])):
regs.append((reg + str(i), offset + i * bits // 8, bits, comment))
m = lexer.next_match()
if m[0] in ("}", "} _t"):
pass
elif m[0] == "} TypeDef":
d = m[1].groupdict()
n = d["id"]
g = d["global"]
if n not in reg_defs or not g:
reg_defs[n] = regs
else:
raise LexerError(lexer.line_number)
return periphs, reg_defs
def print_int_obj(val, needed_mpzs):
if -0x40000000 <= val < 0x40000000:
print("MP_ROM_INT(%#x)" % val, end="")
else:
print("MP_ROM_PTR(&mpz_%08x)" % val, end="")
needed_mpzs.add(val)
def print_periph(periph_name, periph_val, needed_mpzs):
qstr = periph_name.upper()
print("{ MP_ROM_QSTR(MP_QSTR_%s), " % qstr, end="")
print_int_obj(periph_val, needed_mpzs)
print(" },")
def print_regs(reg_name, reg_defs, needed_mpzs):
reg_name = reg_name.upper()
for r in reg_defs:
qstr = reg_name + "_" + r[0]
print("{ MP_ROM_QSTR(MP_QSTR_%s), " % qstr, end="")
print_int_obj(r[1], needed_mpzs)
print(" }, // %s-bits, %s" % (r[2], r[3]))
# This version of print regs groups registers together into submodules (eg GPIO submodule).
# This makes the qstrs shorter, and makes the list of constants more manageable (since
# they are not all in one big module) but it is then harder to compile the constants, and
# is more cumbersome to access.
# As such, we don't use this version.
# And for the number of constants we have, this function seems to use about the same amount
# of ROM as print_regs.
def print_regs_as_submodules(reg_name, reg_defs, modules):
mod_name_lower = reg_name.lower() + "_"
mod_name_upper = mod_name_lower.upper()
modules.append((mod_name_lower, mod_name_upper))
print(
"""
STATIC const mp_rom_map_elem_t stm_%s_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_%s) },
"""
% (mod_name_lower, mod_name_upper)
)
for r in reg_defs:
print(
" { MP_ROM_QSTR(MP_QSTR_%s), MP_ROM_INT(%#x) }, // %s-bits, %s"
% (r[0], r[1], r[2], r[3])
)
print(
"""};
STATIC MP_DEFINE_CONST_DICT(stm_%s_globals, stm_%s_globals_table);
const mp_obj_module_t stm_%s_obj = {
.base = { &mp_type_module },
.name = MP_QSTR_%s,
.globals = (mp_obj_dict_t*)&stm_%s_globals,
};
"""
% (mod_name_lower, mod_name_lower, mod_name_lower, mod_name_upper, mod_name_lower)
)
def main():
cmd_parser = argparse.ArgumentParser(description="Extract ST constants from a C header file.")
cmd_parser.add_argument("file", nargs=1, help="input file")
cmd_parser.add_argument(
"--mpz",
dest="mpz_filename",
default="build/stmconst_mpz.h",
help="the destination file of the generated mpz header",
)
args = cmd_parser.parse_args()
periphs, reg_defs = parse_file(args.file[0])
# add legacy GPIO constants that were removed when upgrading CMSIS
if "GPIO" in reg_defs and "stm32f4" in args.file[0]:
reg_defs["GPIO"].append(["BSRRL", 0x18, 16, "legacy register"])
reg_defs["GPIO"].append(["BSRRH", 0x1A, 16, "legacy register"])
needed_mpzs = set()
print("// Automatically generated from %s by make-stmconst.py" % args.file[0])
print("")
for periph_name, periph_val in periphs:
print_periph(periph_name, periph_val, needed_mpzs)
for reg in (
"ADC",
#'ADC_Common',
#'CAN_TxMailBox',
#'CAN_FIFOMailBox',
#'CAN_FilterRegister',
#'CAN',
"FDCAN",
"CRC",
"DAC",
"DBGMCU",
"DMA_Stream",
"DMA",
"EXTI",
"FLASH",
"GPIO",
"SYSCFG",
"I2C",
"IWDG",
"PWR",
"RCC",
"RTC",
#'SDIO',
"SPI",
"TIM",
"USART",
"WWDG",
"RNG",
"IPCC",
):
if reg in reg_defs:
print_regs(reg, reg_defs[reg], needed_mpzs)
# print_regs_as_submodules(reg, reg_defs[reg], modules)
# print("#define MOD_STM_CONST_MODULES \\")
# for mod_lower, mod_upper in modules:
# print(" { MP_ROM_QSTR(MP_QSTR_%s), MP_ROM_PTR(&stm_%s_obj) }, \\" % (mod_upper, mod_lower))
print("")
with open(args.mpz_filename, "wt") as mpz_file:
for mpz in sorted(needed_mpzs):
assert 0 <= mpz <= 0xFFFFFFFF
print(
"STATIC const mp_obj_int_t mpz_%08x = {{&mp_type_int}, "
"{.neg=0, .fixed_dig=1, .alloc=2, .len=2, "
".dig=(uint16_t*)(const uint16_t[]){%#x, %#x}}};"
% (mpz, mpz & 0xFFFF, (mpz >> 16) & 0xFFFF),
file=mpz_file,
)
if __name__ == "__main__":
main()
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