Debug to stderr if necessary

templates/blackpill/middleware.py

@@ -7,7 +7,8 @@ import struct
 import serial
 import subprocess
 
-f = open("subprocess.log", "w+")
+DBG='1'
+
 
 ser = serial.Serial('/dev/ttyUSB0', 115200)
 
@@ -23,8 +24,6 @@ def read(channel, l):
         data = sys.stdin.buffer.read(l)
     else:
         raise Exception("read() complains: no sai channelino")
-#    if channel == "std" and len(data) == 0:
-#        sys.exit(0)
     if len(data) != l:
         raise Exception("could not read %d bytes of data (got %d)" % (l, len(data)))
     return data
@@ -32,7 +31,8 @@ def read(channel, l):
 def write(channel, data):
     if channel == 'ser':
         l = ser.write(data)
-        f.write("Data sent to serial: " + str(data) + "\n")
+        if DBG:
+            print("Data sent to serial: " + str(data) + "\n", file=sys.stderr)
     elif channel == 'std':
         l = sys.stdout.buffer.write(data)
     else:
@@ -43,7 +43,8 @@ def write(channel, data):
 def obtain(channel):
     l = read(channel, 4)
     (l, ) = struct.unpack("<I", l)
-    f.write("Trying to read %d bytes from %s\n" % (l, channel))
+    if DBG:
+        print("Trying to read %d bytes from %s\n" % (l, channel), file=sys.stderr)
     return read(channel, l)
 
 def submit(channel, action, data):
@@ -56,15 +57,17 @@ def submit(channel, action, data):
     time.sleep(0.1)
 
 def main(argv):
+    if DBG:
+        print(argv[0], file=sys.stderr)
     script_dir = os.path.split(argv[0])[0]
     if len(script_dir ) > 0:
         os.chdir(script_dir)
-    f.write(os.getcwd())
     flash()
     print("Hello, World!")
     while(1):
         action = read('std', 1)
-        f.write("Read following action from stdin: %s\n" % action)
+        if DBG:
+            print("Read following action from stdin: %s\n" % action, file=sys.stderr)
         if action == b'c' or action == b'm' or action == b'a' or action == b'k' or action == b's' or action == b'p':
             data = obtain('std')
             submit('ser', action, data)
@@ -75,9 +78,11 @@ def main(argv):
         elif action == b'C' or action == b'M' or action == b'A' or action == b'K' or action == b'S' or action == b'P':
             write('ser', action)
             data = obtain('ser')
-            f.write("Obtained following data from serial: %s\n" % data)
+            if DBG:
+                print("Obtained following data from serial: %s\n" % data, file=sys.stderr)
             submit('std', action, data)
-            f.write("Submitted following data to stdout: %s\n" % data)
+            if DBG:
+                print("Submitted following data to stdout: %s\n" % data, file=sys.stderr)
         else:
             raise Exception("no capiche aczione %s" % (action))