tools/mpremote: Use signal to capture and handle ctrl-C on Windows.

Now a ctrl-C will not stop mpremote, rather this character will be passed
through to the attached device.

The mpremote version is also increased to 0.0.5.

Signed-off-by: Damien George <damien@micropython.org>

tools/mpremote/mpremote/console.py

@@ -1,11 +1,11 @@
-import sys
+import sys, time
 
 try:
     import select, termios
 except ImportError:
     termios = None
     select = None
-    import msvcrt
+    import msvcrt, signal
 
 
 class ConsolePosix:
@@ -31,9 +31,9 @@ class ConsolePosix:
     def exit(self):
         termios.tcsetattr(self.infd, termios.TCSANOW, self.orig_attr)
 
-    def waitchar(self):
-        # TODO pyb.serial might not have fd
-        select.select([console_in.infd, pyb.serial.fd], [], [])
+    def waitchar(self, pyb_serial):
+        # TODO pyb_serial might not have fd
+        select.select([self.infd, pyb_serial.fd], [], [])
 
     def readchar(self):
         res = select.select([self.infd], [], [], 0)
@@ -75,20 +75,29 @@ class ConsoleWindows:
         b"\x94": b"Z",  # Ctrl-Tab = BACKTAB,
     }
 
+    def __init__(self):
+        self.ctrl_c = 0
+
+    def _sigint_handler(self, signo, frame):
+        self.ctrl_c += 1
+
     def enter(self):
-        pass
+        signal.signal(signal.SIGINT, self._sigint_handler)
 
     def exit(self):
-        pass
+        signal.signal(signal.SIGINT, signal.SIG_DFL)
 
     def inWaiting(self):
-        return 1 if msvcrt.kbhit() else 0
+        return 1 if self.ctrl_c or msvcrt.kbhit() else 0
 
-    def waitchar(self):
-        while not (self.inWaiting() or pyb.serial.inWaiting()):
+    def waitchar(self, pyb_serial):
+        while not (self.inWaiting() or pyb_serial.inWaiting()):
             time.sleep(0.01)
 
     def readchar(self):
+        if self.ctrl_c:
+            self.ctrl_c -= 1
+            return b"\x03"
         if msvcrt.kbhit():
             ch = msvcrt.getch()
             while ch in b"\x00\xe0":  # arrow or function key prefix?
@@ -120,7 +129,7 @@ else:
 
     # Windows VT mode ( >= win10 only)
     # https://bugs.python.org/msg291732
-    import ctypes
+    import ctypes, os
     from ctypes import wintypes
 
     kernel32 = ctypes.WinDLL("kernel32", use_last_error=True)

tools/mpremote/mpremote/main.py

@@ -17,7 +17,7 @@ MicroPython device over a serial connection.  Commands supported are:
     mpremote repl                    -- enter REPL
 """
 
-import os, select, sys, time
+import os, sys
 import serial.tools.list_ports
 
 from . import pyboardextended as pyboard
@@ -249,12 +249,7 @@ def do_filesystem(pyb, args):
 
 def do_repl_main_loop(pyb, console_in, console_out_write, *, code_to_inject, file_to_inject):
     while True:
-        if isinstance(console_in, ConsolePosix):
-            # TODO pyb.serial might not have fd
-            select.select([console_in.infd, pyb.serial.fd], [], [])
-        else:
-            while not (console_in.inWaiting() or pyb.serial.inWaiting()):
-                time.sleep(0.01)
+        console_in.waitchar(pyb.serial)
         c = console_in.readchar()
         if c:
             if c == b"\x1d":  # ctrl-], quit

tools/mpremote/setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = mpremote
-version = 0.0.4
+version = 0.0.5
 author = Damien George
 author_email = damien@micropython.org
 description = Tool for interacting remotely with MicroPython