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#!/usr/bin/python
import serial
import os
import sys
from struct import pack
def get_maple_device_path(file_prefix):
"""Try to find the device file for the Maple on OS X; assuming
that it looks like /dev/<file_prefix>*. If there are multiple
possibilities, ask the user what to do. If the user chooses not
to say, returns None."""
possible_paths = [os.path.join('/dev', x) for x in os.listdir('/dev') \
if x.startswith(file_prefix)]
if len(possible_paths) == 0:
return None
elif len(possible_paths) == 1:
return possible_paths[0]
else:
print 'Found multiple candidates for the Maple device:'
for (i,p) in enumerate(possible_paths):
print '\t%d. %s' % (i+1, p)
prompt = 'Enter a number to select one, or q to quit: '
while True:
resp = raw_input(prompt).strip().lower()
if resp == 'q': return None
try:
i = int(resp, 10)
except ValueError:
pass
else:
if 0 <= i-1 < len(possible_paths):
return possible_paths[i-1]
prompt = 'Please enter a number from the list, or q to quit: '
os_sysname = os.uname()[0]
if os_sysname == 'Linux':
maple_path = get_maple_device_path('ttyACM')
# fall back on /dev/maple if that doesn't work
if maple_path is None:
maple_path = '/dev/maple'
print 'Could not find Maple serial port; defaulting to /dev/maple.'
elif os_sysname == 'Darwin':
maple_path = get_maple_device_path('tty.usbmodem')
else:
# TODO [mbolivar] what to do for windows, BSD, whatever?
maple_path = '/dev/maple'
if maple_path is None:
print 'Could not find the Maple serial port for reset.', \
'Perhaps this is your first upload, or the board is already', \
'in bootloader mode.'
print
print "If your sketch doesn't upload, try putting your Maple", \
'into bootloader mode manually by pressing the RESET button', \
'then letting it go and quickly pressing button BUT', \
'(hold for several seconds).'
sys.exit()
print 'Using %s as Maple serial port' % maple_path
try:
ser = serial.Serial(maple_path, baudrate=115200, xonxoff=1)
ser.open()
# try to toggle DTR/RTS (old scheme)
ser.setRTS(0)
ser.setDTR(0)
ser.setDTR(1)
ser.setDTR(0)
# try magic number
ser.setRTS(1)
ser.setDTR(1)
ser.setDTR(0)
ser.write("1EAF")
# ok we're done here
ser.close()
except:
print 'Failed to open serial port %s for reset.' % maple_path
sys.exit()
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