basic servo simulation (#297)

libs/core/pins.cpp

@@ -201,6 +201,7 @@ namespace pins {
      */
     //% help=pins/servo-write-pin weight=20
     //% blockId=device_set_servo_pin block="servo write|pin %name|to %value" blockGap=8
+    //% parts=microservo trackArgs=0
     void servoWritePin(AnalogPin name, int value) { 
         PINOP(setServoValue(value));
     }

libs/core/pxtparts.json

@@ -29,6 +29,37 @@
             {"pinIndices": [2, 3]}
         ]
     },
+    "microservo": {
+        "simulationBehavior": "microservo",
+        "visual": {
+            "builtIn": "microservo",
+            "width": 74.85,
+            "height": 200,
+            "pinDistance": 10,
+            "pinLocations": [
+                {"x": 30, "y": 5},
+                {"x": 37, "y": 5},
+                {"x": 45, "y": 5}
+            ]
+        },
+        "numberOfPins": 3,
+        "pinDefinitions": [
+            {"target": {"pinInstantiationIdx": 0}, "style": "croc", "orientation": "+Z"},
+            {"target": "threeVolt", "style": "croc", "orientation": "+Z"},
+            {"target": "ground", "style": "croc", "orientation": "+Z"}
+        ],
+        "instantiation": {
+            "kind": "function",
+            "fullyQualifiedName": "pins.servoWritePin",
+            "argumentRoles": [
+                {"pinInstantiationIdx": 0, "partParameter": "name"}
+            ]
+        },
+        "assembly": [
+            {"part": true, "pinIndices": [2]},
+            {"pinIndices": [0, 1]}
+        ]
+    },
     "neopixel": {
         "simulationBehavior": "neopixel",
         "visual": {

libs/core/shims.d.ts

@@ -585,7 +585,8 @@ declare namespace pins {
      * @param value angle or rotation speed, eg:180,90,0
      */
     //% help=pins/servo-write-pin weight=20
-    //% blockId=device_set_servo_pin block="servo write|pin %name|to %value" blockGap=8 shim=pins::servoWritePin
+    //% blockId=device_set_servo_pin block="servo write|pin %name|to %value" blockGap=8
+    //% parts=microservo trackArgs=0 shim=pins::servoWritePin
     function servoWritePin(name: AnalogPin, value: number): void;
 
     /**

sim/dalboard.ts

@@ -12,7 +12,9 @@ namespace pxsim {
         lightSensorState: LightSensorState;
         buttonPairState: ButtonPairState;
         radioState: RadioState;
+        // TODO: not singletons
         neopixelState: NeoPixelState;
+        microServoState: MicroServoState;
 
         constructor() {
             super()
@@ -58,14 +60,17 @@ namespace pxsim {
             this.builtinParts["lightsensor"] = this.lightSensorState = new LightSensorState();
             this.builtinParts["compass"] = this.compassState = new CompassState();
             this.builtinParts["neopixel"] = this.neopixelState = new NeoPixelState();
+            this.builtinParts["microservo"] = this.microServoState = new MicroServoState();
 
             this.builtinVisuals["buttonpair"] = () => new visuals.ButtonPairView();
             this.builtinVisuals["ledmatrix"] = () => new visuals.LedMatrixView();
             this.builtinVisuals["neopixel"] = () => new visuals.NeoPixelView();
+            this.builtinVisuals["microservo"] = () => new visuals.MicroServoView();
 
             this.builtinPartVisuals["buttonpair"] = (xy: visuals.Coord) => visuals.mkBtnSvg(xy);
             this.builtinPartVisuals["ledmatrix"] = (xy: visuals.Coord) => visuals.mkLedMatrixSvg(xy, 8, 8);
             this.builtinPartVisuals["neopixel"] = (xy: visuals.Coord) => visuals.mkNeoPixelPart(xy);
+            this.builtinPartVisuals["microservo"] = (xy: visuals.Coord) => visuals.mkMicroServoPart(xy);
         }
 
         receiveMessage(msg: SimulatorMessage) {

sim/state/edgeconnector.ts

@@ -73,7 +73,11 @@ namespace pxsim.pins {
 
     export function servoWritePin(pinId: number, value: number) {
         analogSetPeriod(pinId, 20000);
-        // TODO
+        // TODO: per pin state
+        if (board().microServoState.angle != value) {
+            board().microServoState.angle = value;
+            runtime.queueDisplayUpdate();
+        }
     }
 
     export function servoSetPulse(pinId: number, micros: number) {