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#!/usr/bin/env python
"""Creates the pin file for the STM32F4xx."""
from __future__ import print_function
import argparse
import sys
import csv
SUPPORTED_FN = {
'TIM' : ['CH1', 'CH2', 'CH3', 'CH4',
'CH1N', 'CH2N', 'CH3N', 'CH1_ETR', 'ETR', 'BKIN'],
'I2C' : ['SDA', 'SCL'],
'USART' : ['RX', 'TX', 'CTS', 'RTS', 'CK'],
'UART' : ['RX', 'TX', 'CTS', 'RTS'],
'SPI' : ['NSS', 'SCK', 'MISO', 'MOSI']
}
def parse_port_pin(name_str):
"""Parses a string and returns a (port-num, pin-num) tuple."""
if len(name_str) < 3:
raise ValueError("Expecting pin name to be at least 3 charcters.")
if name_str[0] != 'P':
raise ValueError("Expecting pin name to start with P")
if name_str[1] < 'A' or name_str[1] > 'J':
raise ValueError("Expecting pin port to be between A and J")
port = ord(name_str[1]) - ord('A')
pin_str = name_str[2:]
if not pin_str.isdigit():
raise ValueError("Expecting numeric pin number.")
return (port, int(pin_str))
def split_name_num(name_num):
num = None
for num_idx in range(len(name_num) - 1, -1, -1):
if not name_num[num_idx].isdigit():
name = name_num[0:num_idx + 1]
num_str = name_num[num_idx + 1:]
if len(num_str) > 0:
num = int(num_str)
break
return name, num
class AlternateFunction(object):
"""Holds the information associated with a pins alternate function."""
def __init__(self, idx, af_str):
self.idx = idx
self.af_str = af_str
self.func = ''
self.fn_num = None
self.pin_type = ''
self.supported = False
af_words = af_str.split('_', 1)
self.func, self.fn_num = split_name_num(af_words[0])
if len(af_words) > 1:
self.pin_type = af_words[1]
if self.func in SUPPORTED_FN:
pin_types = SUPPORTED_FN[self.func]
if self.pin_type in pin_types:
self.supported = True
def is_supported(self):
return self.supported
def ptr(self):
"""Returns the numbered function (i.e. USART6) for this AF."""
if self.fn_num is None:
return self.func
return '{:s}{:d}'.format(self.func, self.fn_num)
def print(self):
"""Prints the C representation of this AF."""
if self.supported:
print(' AF', end='')
else:
print(' //', end='')
fn_num = self.fn_num
if fn_num is None:
fn_num = 0
print('({:2d}, {:8s}, {:2d}, {:10s}, {:8s}), // {:s}'.format(self.idx,
self.func, fn_num, self.pin_type, self.ptr(), self.af_str))
class Pin(object):
"""Holds the information associated with a pin."""
def __init__(self, port, pin):
self.port = port
self.pin = pin
self.alt_fn = []
self.board_name = None
self.alt_fn_count = 0
def port_letter(self):
return chr(self.port + ord('A'))
def pin_name(self):
return '{:s}{:d}'.format(self.port_letter(), self.pin)
def parse_af(self, af_idx, af_strs_in):
if len(af_strs_in) == 0:
return
# If there is a slash, then the slash separates 2 aliases for the
# same alternate function.
af_strs = af_strs_in.split('/')
for af_str in af_strs:
alt_fn = AlternateFunction(af_idx, af_str)
self.alt_fn.append(alt_fn)
if alt_fn.is_supported():
self.alt_fn_count += 1
def alt_fn_name(self):
if self.alt_fn_count > 0:
return 'pin_{:s}_af'.format(self.pin_name())
return 'NULL'
def print(self):
if self.alt_fn_count == 0:
print("// ", end='')
print('const pin_af_obj_t {:s}[] = {{'.format(self.alt_fn_name()))
for alt_fn in self.alt_fn:
alt_fn.print()
if self.alt_fn_count == 0:
print("// ", end='')
print('};')
print('')
print('const pin_obj_t pin_{:s} = PIN({:s}, {:d}, {:d}, {:s});'.format(
self.pin_name(), self.port_letter(), self.pin,
self.alt_fn_count, self.alt_fn_name()))
print('')
def print_header(self, hdr_file):
hdr_file.write('extern const pin_obj_t pin_{:s};\n'.
format(self.pin_name()))
if self.alt_fn_count > 0:
hdr_file.write('extern const pin_af_obj_t pin_{:s}_af[];\n'.
format(self.pin_name()))
class Pins(object):
def __init__(self):
self.pins = []
self.board_pins = []
def find_pin(self, port_num, pin_num):
for pin in self.pins:
if pin.port == port_num and pin.pin == pin_num:
return pin
def parse_af_file(self, filename, pinname_col, af_col):
with open(filename, 'r') as csvfile:
rows = csv.reader(csvfile)
for row in rows:
try:
(port_num, pin_num) = parse_port_pin(row[pinname_col])
except:
continue
pin = Pin(port_num, pin_num)
for af_idx in range(af_col, len(row)):
pin.parse_af(af_idx - af_col, row[af_idx])
self.pins.append(pin)
def parse_board_file(self, filename):
with open(filename, 'r') as csvfile:
rows = csv.reader(csvfile)
for row in rows:
try:
(port_num, pin_num) = parse_port_pin(row[1])
except:
continue
pin = self.find_pin(port_num, pin_num)
if pin:
pin.board_name = row[0]
self.board_pins.append(pin)
def print_named(self, label, pins):
print('const pin_named_pin_t pin_{:s}_pins[] = {{'.format(label))
for pin in pins:
if pin.board_name:
if label == 'board':
pin_name = pin.board_name
else:
pin_name = pin.pin_name()
print(' {{ "{:s}", &pin_{:s} }},'.format(pin_name, pin.pin_name()))
print(' { NULL, NULL }')
print('};')
def print(self):
for pin in self.pins:
if pin.board_name:
pin.print()
self.print_named('cpu', self.pins)
print('')
self.print_named('board', self.board_pins)
def print_header(self, hdr_filename):
with open(hdr_filename, 'wt') as hdr_file:
for pin in self.pins:
if pin.board_name:
pin.print_header(hdr_file)
def main():
parser = argparse.ArgumentParser(
prog="make-pins.py",
usage="%(prog)s [options] [command]",
description="Generate board specific pin file"
)
parser.add_argument(
"-a", "--af",
dest="af_filename",
help="Specifies the alternate function file for the chip",
default="stm32f4xx-af.csv"
)
parser.add_argument(
"-b", "--board",
dest="board_filename",
help="Specifies the board file",
)
parser.add_argument(
"-p", "--prefix",
dest="prefix_filename",
help="Specifies beginning portion of generated pins file",
default="stm32f4xx-prefix.c"
)
parser.add_argument(
"-r", "--hdr",
dest="hdr_filename",
help="Specifies name of generated pin header file",
default="build/pins.h"
)
args = parser.parse_args(sys.argv[1:])
pins = Pins()
print('// This file was automatically generated by make-pins.py')
print('//')
if args.af_filename:
print('// --af {:s}'.format(args.af_filename))
pins.parse_af_file(args.af_filename, 1, 2)
if args.board_filename:
print('// --board {:s}'.format(args.board_filename))
pins.parse_board_file(args.board_filename)
if args.prefix_filename:
print('// --prefix {:s}'.format(args.prefix_filename))
print('')
with open(args.prefix_filename, 'r') as prefix_file:
print(prefix_file.read())
pins.print()
pins.print_header(args.hdr_filename)
if __name__ == "__main__":
main()
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