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Fix sim digitalReadPin and make digital pins toggle switches #7117

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Merged
Richard Knoll (riknoll) merged 2 commits into from
Nov 3, 2026
Merged

Fix sim digitalReadPin and make digital pins toggle switches #7117

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2b9b1bb
Fix sim digitalReadPin and make digital pins toggle switches
microbit-matt-hillsdon Oct 30, 2026
598614b
Merge branch 'master' into sim-digital-pin-switch-role
microbit-matt-hillsdon Nov 2, 2026
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2 changes: 1 addition & 1 deletion sim/state/edgeconnector.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@ namespace pxsim.pins {
let pin = getPin(pinId);
if (!pin) return -1;
pin.mode = PinFlags.Digital | PinFlags.Input;
return pin.value > 100 ? 1 : 0;
return pin.value > 0 ? 1 : 0;
}

export function digitalWritePin(pinId: number, value: number) {
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2 changes: 1 addition & 1 deletion sim/state/edgeconnectorsim.ts
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Expand Up @@ -21,7 +21,7 @@ namespace pxsim {

digitalReadPin(): number {
this.mode = PinFlags.Digital | PinFlags.Input;
return this.value > 100 ? 1 : 0;
return this.value > 0 ? 1 : 0;
}

digitalWritePin(value: number) {
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52 changes: 41 additions & 11 deletions sim/visuals/microbit.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -626,12 +626,11 @@
if (pin.mode & PinFlags.Analog) {
v = Math.floor(100 - (pin.value || 0) / 1023 * 100) + "%";
if (text) text.textContent = (pin.period ? "~" : "") + (pin.value || 0) + "";
ariaValueNow = pin.value ?? 0;

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}
else if (pin.mode & PinFlags.Digital) {
v = pin.value > 0 ? "0%" : "100%";
if (text) text.textContent = pin.value > 0 ? "1" : "0";
ariaValueNow = pin.value > 0 ? 1 : 0;
}
else if (pin.mode & PinFlags.Touch) {
v = pin.touched ? "0%" : "100%";
Expand All @@ -653,15 +652,31 @@
this.pins[index].removeAttribute("aria-valuenow");
this.pins[index].removeAttribute("aria-valuetext");
this.pins[index].removeAttribute("aria-readonly");
this.pins[index].removeAttribute("aria-checked");
} else if (pin.mode & PinFlags.Digital) {
this.pins[index].setAttribute("role", "switch");
this.pins[index].ariaLabel = this.pins[index].firstChild.textContent;
this.pins[index].setAttribute("aria-checked", pin.value > 0 ? "true" : "false");
this.pins[index].removeAttribute("aria-valuemin");
this.pins[index].removeAttribute("aria-valuemax");
this.pins[index].removeAttribute("aria-orientation");
this.pins[index].removeAttribute("aria-valuenow");
this.pins[index].removeAttribute("aria-valuetext");
if (pin.mode & PinFlags.Input) {
this.pins[index].removeAttribute("aria-readonly");
} else {
this.pins[index].setAttribute("aria-readonly", "true");
}
} else {
this.pins[index].removeAttribute("aria-checked");
this.pins[index].setAttribute("role", "slider");
this.pins[index].ariaLabel = this.pins[index].firstChild.textContent;
this.pins[index].setAttribute("aria-valuemin", "0");
this.pins[index].setAttribute("aria-valuemax", pin.mode & PinFlags.Analog ? "1023" : "1");
this.pins[index].setAttribute("aria-valuemax", "1023");
this.pins[index].setAttribute("aria-orientation", "vertical");
this.pins[index].setAttribute("aria-valuenow", ariaValueNow.toString() ?? "");

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// Check that the text content isn't just a plain int and only set aria-valuetext if required.
if (text?.textContent && text?.textContent !== parseInt(text?.textContent).toString()) {

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this.pins[index].setAttribute("aria-valuetext", text.textContent);
} else {
this.pins[index].removeAttribute("aria-valuetext");
Expand Down Expand Up @@ -1534,11 +1549,9 @@
let state = this.board;
let pin = state.edgeConnectorState.pins[index];
let svgpin = this.pins[index];
if (pin.mode & PinFlags.Input && !(pin.mode & PinFlags.Touch)) {
if (pin.mode & PinFlags.Input && pin.mode & PinFlags.Analog && !(pin.mode & PinFlags.Touch)) {
let cursor = svg.cursorPoint(pt, this.element, ev);
let maxValue = pin.mode & PinFlags.Analog ? 1023 : 1;
let v = (400 - cursor.y) / 40 * maxValue;
pin.value = Math.max(0, Math.min(maxValue, Math.floor(v)));
pin.value = analogPinValueFromCursorY(cursor.y);
}
this.updatePin(pin, index);
},
Expand All @@ -1548,11 +1561,9 @@
let pin = state.edgeConnectorState.pins[index];
let svgpin = this.pins[index];
U.addClass(svgpin, "touched");
if (pin.mode & PinFlags.Input && !(pin.mode & PinFlags.Touch)) {
if (pin.mode & PinFlags.Input && pin.mode & PinFlags.Analog && !(pin.mode & PinFlags.Touch)) {
let cursor = svg.cursorPoint(pt, this.element, ev);
let maxValue = pin.mode & PinFlags.Analog ? 1023 : 1;
let v = (400 - cursor.y) / 40 * maxValue;
pin.value = Math.max(0, Math.min(maxValue, Math.floor(v)));
pin.value = analogPinValueFromCursorY(cursor.y);
}
this.updatePin(pin, index);
},
Expand All @@ -1575,6 +1586,15 @@
this.updatePin(pin, index);
}
});
// Toggle on click rather than pointerdown as screen readers in browse mode
// activate a switch by dispatching a click.
pin.addEventListener("click", () => {
const pin = this.board.edgeConnectorState.pins[index];
if (pin.mode & PinFlags.Digital && pin.mode & PinFlags.Input) {
pin.value = pin.value > 0 ? 0 : 1;
this.updatePin(pin, index);
}
});
})
}

Expand Down Expand Up @@ -1781,9 +1801,15 @@
return undefined;
}

const analogPinValueFromCursorY = (y: number): number => {
const fraction = (400 - y) / 40;
return Math.max(0, Math.min(1023, Math.floor(fraction * 1023)));
}

const pinKeyHandler = (e: KeyboardEvent, currentValue: number, min: number, max: number, pinMode: PinFlags): number | undefined => {
const key = e.key;
if (isHandledKey(key)) {
const isToggleKey = pinMode & PinFlags.Digital && (key === " " || key === "Enter");
if (isHandledKey(key) || isToggleKey) {
if (!(pinMode & PinFlags.Input)) {
e.preventDefault();
accessibility.setLiveContent(pxsim.localization.lf("This pin is read-only"));
Expand All @@ -1795,6 +1821,10 @@
return undefined;
}
}
if (isToggleKey) {
e.preventDefault();
return currentValue > 0 ? 0 : 1;
}
// The pin value for a digital pin may be higher than 1 depending on how its value was set.
const currentValueClamped = Math.min(max, currentValue);
return commonKeyHandler(e, currentValueClamped, min, max);
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