Feat: some optimization and fixes

firmware/src/main.cpp

@@ -13,7 +13,7 @@
 #include "driver/gpio.h"
 
 #define TAG "main"
-#define TRIGGER_PIN GPIO_NUM_23
+#define TRIGGER_PIN GPIO_NUM_12
 #define BLE_SERVICE_UUID "deea3136-d728-4f23-823a-104290000000"
 #define BLE_CURRENTTIME_CHARACTERISTIC_UUID "deea3136-d728-4f23-823a-104290000001"
 #define BLE_LASTTRIGGERTIME_CHARACTERISTIC_UUID "deea3136-d728-4f23-823a-104290000002"
@@ -55,11 +55,10 @@ class LocalServerCallbacks : public NimBLEServerCallbacks
 
 class LocalCharacteristicCallbacks : public NimBLECharacteristicCallbacks
 {
-    void onWrite(NimBLECharacteristic *pCharacteristic, NimBLEConnInfo &connInfo) override
+    void onRead(NimBLECharacteristic *pCharacteristic, NimBLEConnInfo &connInfo) override
     {
         bleCurrentTimeCharacteristic->setValue(esp_timer_get_time() / 1000);
-        bleCurrentTimeCharacteristic->notify();
-        // ESP_LOGI(TAG, "Characteristic written!");
+        // ESP_LOGI(TAG, "Characteristic read!");
     }
 };
 
@@ -94,9 +93,7 @@ void app_main()
 
     bleCurrentTimeCharacteristic = bleService->createCharacteristic(
         BLE_CURRENTTIME_CHARACTERISTIC_UUID,
-        NIMBLE_PROPERTY::READ |
-            NIMBLE_PROPERTY::WRITE |
-            NIMBLE_PROPERTY::NOTIFY);
+        NIMBLE_PROPERTY::READ);
     bleCurrentTimeCharacteristic->addDescriptor(new NimBLE2904());
     bleCurrentTimeCharacteristic->setCallbacks(new LocalCharacteristicCallbacks());
 

src/lib/bluetooth.ts

@@ -65,8 +65,6 @@ async function startBluetooth() {
     bluetoothService = await server.getPrimaryService(BLUETOOTH_BUZZER_SERVICE_UUID);
 
     bluetoothCharacteristics.currentTime = await bluetoothService.getCharacteristic(BLUETOOTH_BUZZER_SERVICE_BASE_UUID + '000' + (1));
-    await bluetoothCharacteristics.currentTime.startNotifications();
-    bluetoothCharacteristics.currentTime.addEventListener('characteristicvaluechanged', handleNotifications);
 
     bluetoothCharacteristics.lastTriggerTime = await bluetoothService.getCharacteristic(BLUETOOTH_BUZZER_SERVICE_BASE_UUID + '000' + (2));
     await bluetoothCharacteristics.lastTriggerTime.startNotifications();
@@ -95,9 +93,7 @@ function handleNotifications(this: BluetoothRemoteGATTCharacteristic, event: Eve
 
     const characteristic = event.target as BluetoothRemoteGATTCharacteristic;
 
-    if (characteristic.uuid == bluetoothCharacteristics.currentTime?.uuid)
-        handleNewCurrentTime(new DataView(characteristic.value!.buffer, 0).getBigUint64(0, true));
-    else if (characteristic.uuid == bluetoothCharacteristics.lastTriggerTime?.uuid)
+    if (characteristic.uuid == bluetoothCharacteristics.lastTriggerTime?.uuid)
         handleNewLastTriggerTime(new DataView(characteristic.value!.buffer, 0).getBigUint64(0, true));
 
 }
@@ -109,13 +105,9 @@ async function doOneTimeSync() {
 
     let sentAt = performance.now();
 
-    const remoteTime = new Promise<bigint>((resolve) => {
-        timeSyncResponse = resolve;
-    });
+    const remoteTime = await bluetoothCharacteristics.currentTime.readValue();
 
-    await bluetoothCharacteristics.currentTime.writeValueWithResponse(new ArrayBuffer(0));
-
-    let time = await remoteTime;
+    let time = remoteTime.getBigUint64(0, true);
     let receivedAt = performance.now();
 
     ntp.handleTimeSync(BigInt(Math.floor(sentAt)), BigInt(Math.floor(receivedAt)), time);
@@ -126,14 +118,6 @@ async function doOneTimeSync() {
     });
 }
 
-function handleNewCurrentTime(time: bigint) {
-    if (timeSyncResponse === undefined)
-        return;
-
-    timeSyncResponse(time);
-    timeSyncResponse = undefined;
-}
-
 function handleNewLastTriggerTime(time: bigint) {
     if (ntp === undefined) return;
 

src/routes/+page.svelte

@@ -6,6 +6,30 @@
 	import Timer from './Timer.svelte';
 
 	const uap = new UAParser();
+	let timer: Timer;
+
+	let state: 'idle' | 'wait' | 'ready' | 'running' = 'idle';
+
+	const delay = (time: number) => {
+		return new Promise((resolve) => setTimeout(resolve, time));
+	};
+
+	const start = async () => {
+		state = 'wait';
+		await delay(3000);
+		state = 'ready';
+		await new Audio('/sound/ok-ready-go.mp3').play();
+		await delay(2600);
+		timer.start();
+		state = 'running';
+	};
+
+	const PLACEHOLDERS = {
+		idle: 'Press start!',
+		wait: 'At your marks!',
+		ready: 'Ready!',
+		running: ''
+	};
 
 	$: {
 		checkAvailability();
@@ -39,7 +63,27 @@
 			{/if}.
 		</span>
 	{:else if $bluetoothState == 'CONNECTED'}
-		<Timer />
+		<Timer placeholder={PLACEHOLDERS[state]} bind:this={timer} />
+
+		<Button
+			disabled={state == 'wait' || state == 'ready'}
+			on:click={() => {
+				if (state == 'idle') {
+					start();
+				} else if (state == 'running') {
+					timer.reset();
+					state = 'idle';
+				}
+			}}
+		>
+			{#if state == 'idle'}
+				Start!
+			{:else if state == 'running'}
+				Reset!
+			{:else}
+				Wait ...
+			{/if}
+		</Button>
 	{:else}
 		<Alert color="yellow">Connecting...</Alert>
 	{/if}

src/routes/Timer.svelte

@@ -3,6 +3,19 @@
 	import { buzzerState } from '../stores';
 	import { Button } from 'flowbite-svelte';
 
+	export const start = () => {
+		timerStartedAt = BigInt(Math.floor(performance.now()));
+		timerStoppedAt = undefined;
+	};
+
+	export const reset = () => {
+		timerStartedAt = undefined;
+		timerStoppedAt = undefined;
+		currentTimerValue = undefined;
+	};
+
+	export let placeholder: string = '';
+
 	let timerStartedAt: bigint | undefined;
 	let timerStoppedAt: bigint | undefined;
 
@@ -48,22 +61,19 @@
 	}
 </script>
 
-<div class="flex flex-col items-center gap-3">
+<div class="flex flex-col items-center gap-3 pb-6">
 	<div class="w-full flex flex-row flex-wrap gap-3 justify-center">
 		<div class="flex flex-grow flex-col items-center">
+			{#if placeholder.length > 0}
+				<span class="text-6xl font-bold text-white py-6 text-center"> {placeholder}</span>
+			{:else}
 				<span
 					class="text-9xl font-bold"
 					style="color: {getTimerColor(timerStartedAt, timerStoppedAt)};"
 				>
 					{(Number(currentTimerValue ?? 0) / 1000).toFixed(3)}
 				</span>
+			{/if}
 		</div>
 	</div>
 </div>
-
-<Button
-	on:click={() => {
-		timerStartedAt = BigInt(Math.floor(performance.now()));
-		timerStoppedAt = undefined;
-	}}>Start!</Button
->