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#!/usr/bin/python -S
# Copyright 2004-present Facebook. All rights reserved.
from argparse import ArgumentParser
from at93c46 import AT93C46, AT93C46SPI
import sys
def get_raw(args):
return AT93C46SPI(args.bus_width, args.cs, args.clk, args.mosi, args.miso,
args.verbose)
def get_chip(args):
return AT93C46(args.bus_width, args.cs, args.clk, args.mosi, args.miso,
args.byte_swap, args.verbose)
def access_parser(ap):
# Default, based on currenct HW configuration
SPI_CS_DEFAULT = 68
SPI_CLK_DEFAULT = 69
SPI_MOSI_DEFAULT = 70
SPI_MISO_DEFAULT = 71
spi_group = ap.add_argument_group('SPI Access')
spi_group.add_argument('--cs', type=int, default=SPI_CS_DEFAULT,
help='The GPIO number for SPI CS pin (default: %s)'
% SPI_CS_DEFAULT)
spi_group.add_argument('--clk', type=int, default=SPI_CLK_DEFAULT,
help='The GPIO number for SPI CLK pin (default: %s)'
% SPI_CLK_DEFAULT)
spi_group.add_argument('--mosi', type=int, default=SPI_MOSI_DEFAULT,
help='The GPIO number for SPI MOSI pin (default: %s)'
% SPI_MOSI_DEFAULT)
spi_group.add_argument('--miso', type=int, default=SPI_MISO_DEFAULT,
help='The GPIO number for SPI MISO pin (default: %s)'
% SPI_MISO_DEFAULT)
def bus_width_parser(ap):
# Default, based on currenct HW configuration
AT83C46_BUS_WIDTH = 16
bus_group = ap.add_argument_group('Bus Width')
bus_group.add_argument('--bus-width', type=int, default=AT83C46_BUS_WIDTH,
help='The configured bus width (default: %s)'
% AT83C46_BUS_WIDTH)
def read_raw(args):
raw = get_raw(args)
val = raw.read(args.address)
if args.int:
print "{}".format(val)
else:
if args.bus_width == 16:
print "0x{:04X}".format(val)
else:
print "0x{:02X}".format(val)
def write_raw(args):
if args.value[:2] == "0x":
value = int(args.value, 16)
else:
value = int(args.value)
raw = get_raw(args)
raw.ewen()
raw.erase(args.address)
raw.write(args.address, value)
raw.ewds()
def erase_raw(args):
raw = get_raw(args)
raw.ewen()
raw.erase(args.address)
raw.ewds()
def raw_subparser(subparsers):
raw_parser = subparsers.add_parser('raw', help='Raw memory access')
raw_sub = raw_parser.add_subparsers()
read_parser = raw_sub.add_parser('read', help='Read a single memory address')
read_parser.add_argument('address', type=int, help='The memory address')
read_parser.add_argument('--int', action='store_true',
help='Display output as an integer')
read_parser.set_defaults(func=read_raw)
write_parser = raw_sub.add_parser('write', help='Write a single memory address')
write_parser.add_argument('address', type=int, help='The memory address')
write_parser.add_argument('value', type=str, help='The value to write, either integer or hex')
write_parser.set_defaults(func=write_raw)
erase_parser = raw_sub.add_parser('erase', help='Erase a single memory address')
erase_parser.add_argument('address', type=int, help='The memory address')
erase_parser.set_defaults(func=erase_raw)
def read_chip(args):
chip = get_chip(args)
data = chip.read(args.start, args.length)
if args.file is None:
sys.stdout.write(data)
else:
fp = open(args.file, "wb")
fp.write(data)
def write_chip(args):
chip = get_chip(args)
# Either way, limit reads to the size of the chip
if args.file is None:
data = sys.stdin.read(AT93C46.AT93C46_MEMORY_SIZE)
else:
fp = open(args.file, "rb")
data = fp.read(AT93C46.AT93C46_MEMORY_SIZE)
if args.length is not None:
# Make sure length is correct
if len(data) < args.length:
data = data + '\x00' * (args.length - len(data))
if len(data) > args.length:
data = data[:args.length]
chip.write(data, args.start)
def erase_chip(args):
chip = get_chip(args)
chip.erase(args.start, args.length)
def chip_subparser(subparsers):
chip_parser = subparsers.add_parser('chip', help='Chip-level access')
chip_sub = chip_parser.add_subparsers()
read_parser = chip_sub.add_parser('read', help='Read from the chip')
read_parser.add_argument('--start', type=int,
help='The memory address to start at (default: 0)')
read_parser.add_argument('--length', type=int,
help='The number of bytes to read (default: whole chip)')
read_parser.add_argument('--file', type=str,
help='File to operate on (default: stdout)')
read_parser.add_argument('--byte-swap', action='store_true',
help='Byte swap values for 16-bit reads/writes')
read_parser.set_defaults(func=read_chip)
write_parser = chip_sub.add_parser('write', help='Write to the chip')
write_parser.add_argument('--start', type=int,
help='The memory address to start at (default: 0)')
write_parser.add_argument('--length', type=int,
help='The number of bytes to write (default: file length)')
write_parser.add_argument('--file', type=str,
help='File to operate on (default: stdin)')
write_parser.add_argument('--byte-swap', action='store_true',
help='Byte swap values for 16-bit reads/writes')
write_parser.set_defaults(func=write_chip)
erase_parser = chip_sub.add_parser('erase', help='Erase the chip')
erase_parser.add_argument('--start', type=int,
help='The memory address to start at (default: 0)')
erase_parser.add_argument('--length', type=int,
help='The number of bytes to erase (default: whole chip)')
erase_parser.set_defaults(func=erase_chip)
if __name__ == "__main__":
# General arguments
ap = ArgumentParser()
ap.add_argument('--verbose', action='store_true',
help='Print verbose debugging information')
# SPI and bus width arguments
access_parser(ap)
bus_width_parser(ap)
# Functionality
subparsers = ap.add_subparsers()
raw_subparser(subparsers)
chip_subparser(subparsers)
# Command runner
args = ap.parse_args()
args.func(args)
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