Implement button mmap

libs/core/input.ts

@@ -1,10 +1,28 @@
 namespace input.internal {
     //% shim=pxt::unsafePollForChanges
     export function unsafePollForChanges(
-        periodMs: int32,
-        query: () => int32,
-        changeHandler: (prev: int32, curr: int32) => void
-    ) { }
+        periodMs: number,
+        query: () => number,
+        changeHandler: (prev: number, curr: number) => void
+    ) {
+        // This is implemented in C++ without blocking the regular JS when query() is runnning
+        // which is generally unsafe. Query should not update globally visible state, and cannot
+        // call any yielding functions, like sleep().
+
+        // This is implementation for the simulator.
+
+        control.runInBackground(() => {
+            let prev = query()
+            while (true) {
+                loops.pause(periodMs)
+                let curr = query()
+                if (prev !== curr) {
+                    changeHandler(prev, curr)
+                    prev = curr
+                }
+            }
+        })
+    }
 
     let analogMM: MMap
     let uartMM: MMap

sim/state/buttons.ts

@@ -1,6 +1,6 @@
 namespace pxsim {
 
-    export class EV3ButtonState extends CommonButtonState{
+    export class EV3ButtonState extends CommonButtonState {
 
         constructor() {
             super();
@@ -13,6 +13,24 @@ namespace pxsim {
                 new CommonButton(DAL.BUTTON_ID_ESCAPE),
                 new CommonButton(DAL.BUTTON_ID_ALL)
             ];
+            let data = new Uint8Array(this.buttons.length)
+            MMapMethods.register("/dev/lms_ui", {
+                data,
+                beforeMemRead: () => {
+                    for (let i = 0; i < this.buttons.length; ++i)
+                        data[i] = this.buttons[i].isPressed() ? 1 : 0
+                },
+                read: buf => {
+                    let v = "vSIM"
+                    for (let i = 0; i < buf.data.length; ++i)
+                        buf.data[i] = v.charCodeAt(i) || 0
+                    return buf.data.length
+                },
+                write: buf => {
+                    pxsim.output.setLights(buf.data[0] - 48)
+                    return 2
+                }
+            })
         }
     }
 }

sim/state/control.ts

@@ -1,9 +1,92 @@
 /// <reference path="../../libs/core/enums.d.ts"/>
 
-namespace pxsim.control {
-    
-    export function mmap(filename: string, size: number, offset: number): void {
-        
+namespace pxsim.MMapMethods {
+    export interface MMapImpl {
+        data?: Uint8Array;
+        afterMemWrite?: () => void;
+        beforeMemRead?: () => void;
+        read?: (d: Buffer) => number;
+        write?: (d: Buffer) => number;
+        ioctl?: (id: number, d: Buffer) => number;
     }
 
+    import BM = pxsim.BufferMethods
+    import NumberFormat = BM.NumberFormat
+    import Buffer = pxsim.RefBuffer
+
+    export class MMap extends pxsim.RefObject {
+        constructor(public impl: MMapImpl, public len: number) {
+            super()
+            if (!impl.data) impl.data = new Uint8Array(this.len)
+            if (!impl.afterMemWrite) impl.afterMemWrite = () => { }
+            if (!impl.beforeMemRead) impl.beforeMemRead = () => { }
+            if (!impl.read) impl.read = () => 0
+            if (!impl.write) impl.write = () => 0
+            if (!impl.ioctl) impl.ioctl = () => -1
+        }
+        destroy() {
+        }
+        buf(): Buffer {
+            return { data: this.impl.data } as any
+        }
+    }
+
+    export const mmapRegistry: pxt.Map<MMapImpl> = {}
+
+    export function register(filename: string, impl: MMapImpl) {
+        mmapRegistry[filename] = impl
+    }
+
+    export function setNumber(m: MMap, format: NumberFormat, offset: number, value: number): void {
+        BM.setNumber(m.buf(), format, offset, value)
+        m.impl.afterMemWrite();
+    }
+
+    export function getNumber(m: MMap, format: NumberFormat, offset: number): number {
+        m.impl.beforeMemRead()
+        return BM.getNumber(m.buf(), format, offset)
+    }
+
+    export function slice(m: MMap, offset?: number, length?: number): Buffer {
+        m.impl.beforeMemRead()
+        return BM.slice(m.buf(), offset, length)
+    }
+
+    export function length(m: MMap): number {
+        m.impl.beforeMemRead()
+        return m.buf().data.length
+    }
+
+    export function ioctl(m: MMap, id: number, data: Buffer): number {
+        return m.impl.ioctl(id, data)
+    }
+
+    export function write(m: MMap, data: Buffer): number {
+        return m.impl.write(data)
+
+    }
+
+    export function read(m: MMap, data: Buffer): number {
+        return m.impl.read(data)
+    }
+}
+
+namespace pxsim.control {
+
+    export function mmap(filename: string, size: number, offset: number): MMapMethods.MMap {
+        let impl = MMapMethods.mmapRegistry[filename]
+        if (!impl) impl = {}
+        return new MMapMethods.MMap(impl, size)
+    }
+
+    export function dmesg(s: string) {
+        console.log("DMESG: " + s)
+    }
+
+}
+
+namespace pxsim.output {
+    export function createBuffer(size: number) {
+        return BufferMethods.createBuffer(size)
+    }
 }