merging microbit

sim/state/edgeconnector.ts

@@ -72,12 +72,12 @@ namespace pxsim.pins {
     }
 
     export function servoWritePin(pinId: number, value: number) {
+        let pin = getPin(pinId);
+        if (!pin) return;
+
         analogSetPeriod(pinId, 20000);
-        // TODO: per pin state
-        if (board().microServoState.angle != value) {
-            board().microServoState.angle = value;
-            runtime.queueDisplayUpdate();
-        }
+        const state = board().servosState.servoState(pinId);
+        state.setAngle(value);
     }
 
     export function servoSetPulse(pinId: number, micros: number) {

sim/state/filesystem.ts

@@ -0,0 +1,18 @@
+namespace pxsim.files {
+    export function appendLine(filename: string, text: string) {
+        const b = board();
+        b.fileSystem.append(filename, text + "\r\n");
+    }
+    export function appendString(filename: string, text: string) {
+        const b = board();
+        b.fileSystem.append(filename, text);
+    }
+    export function appendNumber(filename: string, value: number) {
+        const b = board();
+        b.fileSystem.append(filename, value.toString());
+    }
+    export function remove(filename: string) {
+        const b = board();
+        b.fileSystem.remove(filename);
+    }
+}