uf2conv.py add option to wait for device to flash

utils/uf2conv.md

@@ -5,10 +5,10 @@
 **uf2conv.py** [-h] [-l]
 
 **uf2conv.py** [-b BASE] [-f FAMILY] [-o FILE] [-d DEVICE_PATH] [-l] [-c] [-D]
- [-C]
+ [-w] [-C]
  [HEX or BIN FILE]
 
-**uf2conv.py** [-c] [-D] [-i] [UF2 FILE]
+**uf2conv.py** [-c] [-D] [-w] [-i] [UF2 FILE]
 
 ## DESCRIPTION
 
@@ -55,6 +55,9 @@
 `--deploy`
 : just flash, do not convert
 
+`-w`
+`--wait`
+: wait for device to flash
 
 `-C`
 `--carray`

utils/uf2conv.py

@@ -7,6 +7,7 @@
 import os.path
 import argparse
 import json
+from time import sleep
 
 
 UF2_MAGIC_START0 = 0x0A324655 # "UF2\n"
@@ -288,6 +289,8 @@ def error(msg):
  help='do not flash, just convert')
  parser.add_argument('-D', '--deploy', action='store_true',
  help='just flash, do not convert')
+ parser.add_argument('-w', '--wait', action='store_true',
+ help='wait for device to flash')
  parser.add_argument('-C', '--carray', action='store_true',
  help='convert binary file to a C array, not UF2')
  parser.add_argument('-i', '--info', action='store_true',
@@ -339,8 +342,14 @@ def error(msg):
  write_file(args.output, outbuf)
  if ext == "uf2" and not args.convert and not args.info:
  drives = get_drives()
- if len(drives) == 0 and not args.output:
- error("No drive to deploy.")
+ if len(drives) == 0:
+ if args.wait:
+ print("Waiting for drive to deploy...")
+ while len(drives) == 0:
+ sleep(0.1)
+ drives = get_drives()
+ elif not args.output:
+ error("No drive to deploy.")
  for d in drives:
  print("Flashing %s (%s)" % (d, board_id(d)))
  write_file(d + "/NEW.UF2", outbuf)