add function to reset the UART back to USB

README.md

@@ -3,6 +3,12 @@
 This target allow to program a [Calliope](http://calliope.cc/) using 
 PXT ([Microsoft Programming Experience Toolkit](https://github.com/Microsoft/pxt)).
 
+### BUILD COMMENTS
+
+- build libs/core/dal.d.ts new requires some meddling, as the `#define` parser does not parse `#ifdef` and thus
+has some conflicts with double defines constants
+
+
 [![Build Status](https://travis-ci.org/Microsoft/pxt-calliope.svg?branch=master)](https://travis-ci.org/Microsoft/pxt-calliope)
 
 ![](http://calliope.cc/content/1-ueber-mini/mini_board.png)

libs/core/_locales/core-jsdoc-strings.json

@@ -253,6 +253,7 @@
   "serial.redirect|param|rate": "the new baud rate. eg: 115200",
   "serial.redirect|param|rx": "the new reception pin, eg: SerialPin.P1",
   "serial.redirect|param|tx": "the new transmission pins, eg: SerialPin.P0",
+  "serial.reset": "Reset the serial instance to use the USBTX and USBRX at the default baud rate.",
   "serial.writeLine": "Prints a line of text to the serial",
   "serial.writeNumber": "Prints a numeric value to the serial",
   "serial.writeString": "Sends a piece of text through Serial connection.",

libs/core/_locales/core-strings.json

@@ -233,6 +233,7 @@
   "serial.readString|block": "serial|read string",
   "serial.readUntil|block": "serial|read until %delimiter=serial_delimiter_conv",
   "serial.redirect|block": "serial|redirect to|TX %tx|RX %rx|at baud rate %rate",
+  "serial.reset|block": "serial pin reset",
   "serial.writeLine|block": "serial|write line %text",
   "serial.writeNumber|block": "serial|write number %value",
   "serial.writeString|block": "serial|write string %text",

libs/core/serial.cpp

@@ -100,4 +100,16 @@ namespace serial {
       uBit.serial.redirect(txp->name, rxp->name);
       uBit.serial.baud((int)rate);
     }
+
+   /**
+    * Reset the serial instance to use the USBTX and USBRX at the default baud rate.
+    */
+    //% weight=10
+    //% help=serial/reset
+    //% blockId=serial_reset block="serial pin reset"
+    //% blockExternalInputs=1
+    void reset() {
+      uBit.serial.redirect(USBTX, USBRX);
+      uBit.serial.baud(MICROBIT_SERIAL_DEFAULT_BAUD_RATE);
+    }
 }

libs/core/shims.d.ts

@@ -760,6 +760,15 @@ declare namespace serial {
     //% blockId=serial_redirect block="serial|redirect to|TX %tx|RX %rx|at baud rate %rate"
     //% blockExternalInputs=1 shim=serial::redirect
     function redirect(tx: SerialPin, rx: SerialPin, rate: BaudRate): void;
+
+    /**
+     * Reset the serial instance to use the USBTX and USBRX at the default baud rate.
+     */
+    //% weight=10
+    //% help=serial/reset
+    //% blockId=serial_reset block="serial pin reset"
+    //% blockExternalInputs=1 shim=serial::reset
+    function reset(): void;
 }
 
 

pxtarget.json

@@ -9,7 +9,10 @@
         "libs/core",
         "libs/radio",
         "libs/devices",
-        "libs/bluetooth"
+        "libs/bluetooth",
+        "libs/pxt-calliope-bc95",
+        "libs/pxt-calliope-bunt",
+        "libs/pxt-isl29125"
     ],
     "cloud": {
         "workspace": false,