Add options to invert pin reset logic (#97)

This PR adds 'dtr_inverted' and 'rts_inverted' as options for '-A' that invert the pin logic for autoreset.
grigorig · Nov 11, 2023 · a660184 · a660184
1 parent 6e8e736
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Showing 3 changed files with 13 additions and 5 deletions.
diff --git a/doc/USAGE.md b/doc/USAGE.md
@@ -22,7 +22,7 @@ options:
   -h, --help            show this help message and exit
   -e, --erase           only erase flash memory
   -a, --autoreset       cycle power automatically by asserting DTR
-  -A {dtr,rts}, --resetpin {dtr,rts}
+  -A {dtr,rts,dtr_inverted,rts_inverted}, --resetpin {dtr,rts,dtr_inverted,rts_inverted}
                         pin to hold down when using --autoreset (default: DTR)
   -r RESETCMD, --resetcmd RESETCMD
                         shell command for board power-cycling (instead of DTR

diff --git a/stcgal/frontend.py b/stcgal/frontend.py
@@ -263,7 +263,7 @@ def cli():
     exclusives.add_argument("-e", "--erase", help="only erase flash memory", action="store_true")
     parser.add_argument("-a", "--autoreset", help="cycle power automatically by asserting DTR", action="store_true")
     parser.add_argument("-A", "--resetpin", help="pin to hold down when using --autoreset (default: DTR)",
-                        choices=["dtr", "rts"], default="dtr")
+                        choices=["dtr", "rts", "dtr_inverted", "rts_inverted"], default="dtr")
     parser.add_argument("-r", "--resetcmd",  help="shell command for board power-cycling (instead of DTR assertion)", action="store")
     parser.add_argument("-P", "--protocol", help="protocol version (default: auto)",
                         choices=["stc89", "stc89a", "stc12a", "stc12b", "stc12", "stc15a", "stc15", "stc8", "stc8d", "stc8g", "usb15", "auto"], default="auto")

diff --git a/stcgal/protocols.py b/stcgal/protocols.py
@@ -265,22 +265,30 @@ def get_iap_delay(self, clock_hz):
     def set_option(self, name, value):
         self.options.set_option(name, value)
 
-    def reset_device(self, resetcmd=False, resetpin=False):
+    def reset_device(self, resetcmd=False, resetpin=False, invertreset=False):
         if not resetcmd:
             print("Cycling power: ", end="")
             sys.stdout.flush()
 
             if resetpin == "rts":
                 self.ser.setRTS(True)
-            else:
+            elif resetpin == "dtr":
                 self.ser.setDTR(True)
+            elif resetpin == "rts_inverted":
+                self.ser.setRTS(False)
+            else: # dtr_inverted
+                self.ser.setDTR(False)
 
             time.sleep(0.25)
 
             if resetpin == "rts":
                 self.ser.setRTS(False)
-            else:
+            elif resetpin == "dtr":
                 self.ser.setDTR(False)
+            elif resetpin == "rts_inverted":
+                self.ser.setRTS(True)
+            else: # dtr_inverted
+                self.ser.setDTR(True)
 
             time.sleep(0.030)
             print("done")