Add format to the print

extension.cpp

@@ -10,10 +10,11 @@ namespace dataStreamer {
 
     /**
     * Set the USB baud rate connection.
-    * @param rate the new baud rate. eg: 115200
+    * @param rate the new baud rate.
     */
     //% weight=10
     //% blockId=datastreamer_setBaud block="set baud rate %rate"
+    //% rate.defl=9600
 
    void setBaudRate(int rate) {
     uBit.serial.baud(rate);

extension.ts

@@ -6,11 +6,32 @@ namespace dataStreamer {
     /**
      * Print a numeric value to the serial port
      * @param value to send over serial
+     * @param decimalDigits (optional) unit of the value
      */
-    //% blockId=datastreamer_writeNumber block="write number %value"
+    //% blockId=datastreamer_writeNumber block="write number %value|\\%||format %decimalDigits"
     //% weight=30
-    export function writeNumber(value: number) {
-        serial.writeNumber(value)
+    //% decimalDigits.defl=2
+    //% expandableArgumentMode=toggle
+
+    export function writeNumber(value: number, decimalDigits: number) {
+        //Format to right number of decimalDigits
+        let text: string = value.toString();
+        let len = 0; //Tracks the subscrtring length
+
+        for (;len < text.length; len++) { //Find the .
+            if (text[len] == ".") { break; }
+        }
+
+        if (decimalDigits != 0)  { 
+            len++ //Account for .
+            if (len + decimalDigits <  text.length) { 
+                len = len + decimalDigits;
+            } else {
+                len = text.length;
+            }
+        }
+        
+       serial.writeString(text.substr(0, len))
     }
 
     /**
@@ -36,12 +57,17 @@ namespace dataStreamer {
     /**
      * Print an array of numeric values as CSV to the serial port
      */
-    //% blockId=datastreamer_writenumbers block="write comma seperated numbers %values"
+    //% blockId=datastreamer_writenumbers block="write array as comma seperated numbers %values|\\%||format %decimalDigits"
     //% weight=10
-    export function writeNumbers(values: number[]): void {
+    //% values.shadow="lists_create_with"
+    //% decimalDigits.defl=2
+    //% expandableArgumentMode=toggle
+    export function writeNumbers(values: number[], decimalDigits: number): void {
         for (let i = 0; i < values.length; i++) {
-            serial.writeNumber(values[i])
-            serial.writeLine(",")
+            dataStreamer.writeNumber(values[i], decimalDigits)
+            if ((i + 1) < values.length) {
+                dataStreamer.writeString(",")
+            }
         }
     }
 

shims.d.ts

@@ -3,11 +3,12 @@ declare namespace dataStreamer {
 
     /**
      * Set the USB baud rate connection.
-     * @param rate the new baud rate. eg: 115200
+     * @param rate the new baud rate.
      */
     //% weight=10
-    //% blockId=datastreamer_setBaud block="set baud rate %rate" shim=dataStreamer::setBaudRate
-    function setBaudRate(rate: int32): void;
+    //% blockId=datastreamer_setBaud block="set baud rate %rate"
+    //% rate.defl=9600 shim=dataStreamer::setBaudRate
+    function setBaudRate(rate?: int32): void;
 }
 
 // Auto-generated. Do not edit. Really.

test.ts

@@ -1,18 +1,18 @@
-dataStreamer.writeNumber(1 / 5);
+dataStreamer.writeNumber(1 / 5,1);
 dataStreamer.writeLine();
-dataStreamer.writeNumber(20 / 3);
+dataStreamer.writeNumber(20 / 3,2);
 dataStreamer.writeLine();
-dataStreamer.writeNumber(400 / 35);
+dataStreamer.writeNumber(400 / 35,3);
 dataStreamer.writeLine();
-dataStreamer.writeNumber(1000 / 2);
+dataStreamer.writeNumber(1000 / 2,4);
 dataStreamer.writeLine();
-dataStreamer.writeNumber(1002);
+dataStreamer.writeNumber(1002,5);
 dataStreamer.writeLine();
-dataStreamer.writeNumber(10000002 / 458);
+dataStreamer.writeNumber(10000002 / 458, 6);
 dataStreamer.writeLine();
-dataStreamer.writeNumber(0);
+dataStreamer.writeNumber(0,7);
 dataStreamer.writeLine();
-dataStreamer.writeNumber(-1);
+dataStreamer.writeNumber(-1,0);
 dataStreamer.writeLine();
-dataStreamer.writeNumber(-1000 / 3);
-dataStreamer.writeNumbers([5, 2 / 5, 44 / 444, 5 / 5]);
+dataStreamer.writeNumber(-1000 / 3,1);
+dataStreamer.writeNumbers([5, 2 / 5, 44 / 444, 5 / 5],1);