SAMD Cortex M0 device support (Zero, MKR1000, etc)

Compilation improvements by adding variant as other obj but not working on device

Arduino Zero devices with OpenOCD working

Created ARM_TOOLS_DIR and define arm toolchain executables in Sam.mk

Check avr-gcc on last AVR_TOOLS_DIR detect and indenting formatting

GDB debugging and programming added

Documentation updates and define ARDMK_VENDOR rather than include Sam.mk

Expand all parse_boards when defined rather than when used

Trim extra defines regex working on both macOS and Linux but need better fix

Print USB ids and added debug usage to readme

Add note on Arduino package dir and made board.txt work

Do ARM ARDUINO_ARCH define in Arduino.mk]

Add MZeroBlink to non-testable examples for now

Remove \B from extra defines grep

Add ARDUINO_PACKAGE_DIR for board support files

Fix a typo in the README

Fix typo in arduino-mk-vars.md

Prevent re-including Arduino.mk from Sam.mk when make restarts for upload

Add catrina to ARD_REST_OPTS if/else

Remove realpath in Sam.mk for cygwin compatability

SAMD bootloader support in ard-reset using --zero

Enters bootloader using open/close of port at 1200 BAUD, then polls the
attached devices for new port enumerating (bootloader). This is how the
Arduino IDE operates

Bossa support for Zero, MKR1000 etc

Re-word Arm README section after Native USB development

Reset for zero refactored like IDE

Zero bootloader reset tested on macOS and comments added

Re-word ARM bootloader and remove imports from testing

Patch changes ARDMK_VENDOR->ARCHITECHTURE, show_config_vars, ignore CORE_VER if emtpy

Common.mk header guard, openocd/bossac avoid separator, typos

Documentation update for patch changes

Move ARM tools to Sam.mk and auto-detect include

Correct accidental commit of Blink Makefile change

Lib fix with alternative core and documentation

Append zero to ARD_RESET_OPTS rather than set

Prioritise package ARM upload tools over path installed

Add note in README on ARM tools versions

Move openocd variant config script flag to OPTS

1 files changed, 89 insertions, 1 deletions

diff --git a/bin/ard-reset-arduino b/bin/ard-reset-arduino
index 1f2c7e9..d6f974f 100755
--- a/bin/ard-reset-arduino
+++ b/bin/ard-reset-arduino
@@ -2,6 +2,7 @@
 
 from __future__ import print_function
 import serial
+import serial.tools.list_ports
 import os.path
 import argparse
 from time import sleep
@@ -13,13 +14,100 @@ except:
   pyserial_version = 2  # less than 2.3
 
 parser = argparse.ArgumentParser(description='Reset an Arduino')
+parser.add_argument('--zero', action='store_true', help='Reset Arduino Zero or similar Native USB to enter bootloader')
 parser.add_argument('--caterina', action='store_true', help='Reset a Leonardo, Micro, Robot or LilyPadUSB.')
 parser.add_argument('--verbose', action='store_true', help="Watch what's going on on STDERR.")
 parser.add_argument('--period', default=0.1, help='Specify the DTR pulse width in seconds.')
 parser.add_argument('port', nargs=1, help='Serial device e.g. /dev/ttyACM0')
 args = parser.parse_args()
 
-if args.caterina:
+
+def list_ports(output=False):
+    """ Lists serial ports attached
+
+        :returns
+            A list of paths to serial ports on system
+    """
+    ports = serial.tools.list_ports.comports()
+    connected = [port[0] for port in ports]
+    if output:
+        print(connected)
+
+    return connected
+
+
+def new_port(old, new):
+    """ Checks if a new port has attached
+
+        Args:
+            old: previous list of ports to check
+            new: current list of ports to check
+        Returns:
+            index of port in 'new' if new port found, otherwise -1
+    """
+    new_port = -1
+
+    for port in new:
+        if port not in old:
+            new_port = new.index(port)
+            break
+
+    return new_port
+
+
+if args.zero:
+    # number of trys to attempt
+    zero_attempts = 20 # ~2 seconds
+    initial_ports = list_ports(args.verbose)
+
+    if args.verbose:
+        print('Attempting to enter bootloader using 1200 bps open/close on port %s' % args.port[0])
+
+    ser = serial.Serial(args.port[0], 57600)
+    ser.close()
+
+    if pyserial_version < 3:
+        ser.setBaudrate(1200)
+    else:
+        ser.baudrate = 1200
+
+    # do the open/close at 1200 BAUD
+    ser.open()
+    ser.close()
+
+    if args.verbose:
+        print('Done. Waiting for bootloader port to attach...')
+
+    # get new list of ports
+    reset_ports = list_ports(args.verbose)
+
+    # wait for new port or port to return
+    port_index = new_port(initial_ports, reset_ports)
+
+    # keep checking until new port appears or timeout
+    while port_index < 0:
+        # count down attempts and leave if expired
+        zero_attempts -= 1
+        if zero_attempts < 0:
+            break
+        sleep(0.1)
+        # get list of ports after bootloader toggle performed
+        reset_ports = list_ports(args.verbose)
+        # if a port drops, set initial ports to reset ports so that
+        # next attached device will be new port
+        if (len(reset_ports) < len(initial_ports)):
+            initial_ports = reset_ports
+        # check if a new port has attached and return the index if it has
+        port_index = new_port(initial_ports, reset_ports)
+    # return the new port if detected, otherwise return passed port
+    if port_index is -1:
+        bootloader_port = args.port[0]
+    else:
+        bootloader_port = reset_ports[port_index]
+
+    # print so that `tail -1` can be piped for bootloader port
+    print(bootloader_port)
+elif args.caterina:
     if args.verbose: print('Forcing reset using 1200bps open/close on port %s' % args.port[0])
     ser = serial.Serial(args.port[0], 57600)
     ser.close()