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#!/usr/bin/python
import sys
import struct
import subprocess
import re
import os
import os.path
import argparse
UF2_MAGIC_START0 = 0x0A324655 # "UF2\n"
UF2_MAGIC_START1 = 0x9E5D5157 # Randomly selected
UF2_MAGIC_END = 0x0AB16F30 # Ditto
INFO_FILE = "/INFO_UF2.TXT"
appstartaddr = 0x2000
def isUF2(buf):
w = struct.unpack("<II", buf[0:8])
return w[0] == UF2_MAGIC_START0 and w[1] == UF2_MAGIC_START1
def convertFromUF2(buf):
numblocks = len(buf) / 512
curraddr = None
outp = ""
for blockno in range(0, numblocks):
ptr = blockno * 512
block = buf[ptr:ptr + 512]
hd = struct.unpack("<IIIIIIII", block[0:32])
if hd[0] != UF2_MAGIC_START0 or hd[1] != UF2_MAGIC_START1:
print "Skipping block at " + ptr + "; bad magic"
continue
if hd[2] & 1:
# NO-flash flag set; skip block
continue
datalen = hd[4]
if datalen > 476:
assert False, "Invalid UF2 data size at " + ptr
newaddr = hd[3]
if curraddr == None:
appstartaddr = newaddr
curraddr = newaddr
padding = newaddr - curraddr
if padding < 0:
assert False, "Block out of order at " + ptr
if padding > 10*1024*1024:
assert False, "More than 10M of padding needed at " + ptr
if padding % 4 != 0:
assert False, "Non-word padding size at " + ptr
while padding > 0:
padding -= 4
outp += "\x00\x00\x00\x00"
outp += block[32 : 32 + datalen]
curraddr = newaddr + datalen
return outp
def convertToUF2(fileContent):
datapadding = ""
while len(datapadding) < 512 - 256 - 32 - 4:
datapadding += "\x00\x00\x00\x00"
numblocks = (len(fileContent) + 255) / 256
outp = ""
for blockno in range(0, numblocks):
ptr = 256 * blockno
chunk = fileContent[ptr:ptr + 256]
hd = struct.pack("<IIIIIIII",
UF2_MAGIC_START0, UF2_MAGIC_START1,
0, ptr + appstartaddr, 256, blockno, numblocks, 0)
while len(chunk) < 256:
chunk += "\x00"
block = hd + chunk + datapadding + struct.pack("<I", UF2_MAGIC_END)
assert len(block) == 512
outp += block
return outp
def getdrives():
drives = []
if sys.platform == "win32":
r = subprocess.check_output(["wmic", "PATH", "Win32_LogicalDisk", "get", "DeviceID,", "VolumeName,", "FileSystem,", "DriveType"])
for line in r.split('\n'):
words = re.split('\s+', line)
if len(words) >= 3 and words[1] == "2" and words[2] == "FAT":
drives.append(words[0])
else:
rootpath = "/media"
if sys.platform == "darwin":
rootpath = "/Volumes"
elif sys.platform == "linux":
tmp = rootpath + "/" + os.environ["USER"]
if os.path.isdir(tmp):
rootpath = tmp
for d in os.listdir(rootpath):
drives.append(os.path.join(rootpath, d))
def hasInfo(d):
try:
return os.path.isfile(d + INFO_FILE)
except:
return False
return filter(hasInfo, drives)
def boardID(path):
with open(path + INFO_FILE, mode='r') as file:
fileContent = file.read()
return re.search("Board-ID: ([^\r\n]*)", fileContent).group(1)
def listdrives():
for d in getdrives():
print d, boardID(d)
def writeFile(name, buf):
with open(name, "wb") as f:
f.write(buf)
print "Wrote %d bytes to %s." % (len(buf), name)
def main():
global appstartaddr
def error(msg):
print msg
sys.exit(1)
parser = argparse.ArgumentParser(description='Convert to UF2 or flash directly.')
parser.add_argument('input', metavar='INPUT', type=str, nargs='?',
help='input file (BIN or UF2)')
parser.add_argument('-b' , '--base', dest='base', type=str,
default="0x2000",
help='set base address of application (default: 0x2000)')
parser.add_argument('-o' , '--output', metavar="FILE", dest='output', type=str,
help='write output to named file; defaults to "flash.uf2" or "flash.bin" where sensible')
parser.add_argument('-d' , '--device', dest="device_path",
help='select a device path to flash')
parser.add_argument('-l' , '--list', action='store_true',
help='list connected devices')
parser.add_argument('-c' , '--convert', action='store_true',
help='do not flash, just convert')
args = parser.parse_args()
appstartaddr = int(args.base, 0)
if args.list:
listdrives()
else:
if not args.input:
error("Need input file")
with open(args.input, mode='rb') as file:
inpbuf = file.read()
fromUF2 = isUF2(inpbuf)
ext = "uf2"
if fromUF2:
outbuf = convertFromUF2(inpbuf)
ext = "bin"
else:
outbuf = convertToUF2(inpbuf)
print "Converting to %s, output size: %d, start address: 0x%x" % (ext, len(outbuf), appstartaddr)
if args.convert:
drives = []
if args.output == None:
args.output = "flash." + ext
else:
drives = getdrives()
if args.output:
writeFile(args.output, outbuf)
else:
if len(drives) == 0:
error("No drive to deploy.")
for d in drives:
print "Flashing %s (%s)" % (d, boardID(d))
writeFile(outbuf, d + "/NEW.UF2")
if __name__ == "__main__":
main()
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