Add initial support for CH559 (WIP/RFC) (#29)

* Add WIP chtool upload

Add uploader to support CH55x MCS-51 USB chips

* Add CH559 board definition

* Update ch559.json

change f_cpu to match reset state, per data sheet:

After reset, Fosc = 12MHz, Fpll = 288MHz, Fusb4x = 48MHz, Fsys = 12MHz.

* fix the omission of "env.Replace"

Now working with manual placement of ch55xtool.py in project folder

* update python3 to $PYTHONEXE

Per #29 (comment)

boards/ch559.json

@@ -0,0 +1,20 @@
+{
+  "build": {
+    "f_cpu": "12000000L",
+    "size_iram": 256,
+    "size_xram": 6144,
+    "size_code": 65536,
+    "size_heap": 128,
+    "mcu": "ch559",
+    "cpu": "mcs51"
+  },
+  "frameworks": [],
+  "upload": {
+    "maximum_ram_size": 6400,
+    "maximum_size": 65536,
+    "protocol": "ch55x"
+  },
+  "name": "CH559",
+  "url": "http://www.wch-ic.com/products/CH559.html",
+  "vendor": "WCH"
+}

builder/main.py

@@ -163,6 +163,21 @@ def _parseSdccFlags(flags):
         env.VerboseAction("$UPLOADCMD", "Uploading $SOURCE")
     ]
 
+# CH55x upload tool
+elif upload_protocol == "ch55x":
+    env.Replace(
+        UPLOADER="ch55xtool.py",
+        UPLOADERFLAGS=[
+            "-f"
+        ],
+        UPLOADCMD="$PYTHONEXE $UPLOADER $UPLOADERFLAGS $BUILD_DIR/${PROGNAME}.bin")
+
+    upload_actions = [
+        env.VerboseAction(" ".join(["$OBJCOPY","-I","ihex","-O","binary",
+            "$SOURCE", "$BUILD_DIR/${PROGNAME}.bin"]), "Creating binary"),
+        env.VerboseAction("$UPLOADCMD", "Uploading ${PROGNAME}.bin")
+    ]
+
 # custom upload tool
 elif upload_protocol == "custom":
     upload_actions = [env.VerboseAction("$UPLOADCMD", "Uploading $SOURCE")]