optimize image transfer speed

tsl0922 · Jan 16, 2025 · 49d2ae0 · 49d2ae0
1 parent 60d48ad
commit 49d2ae0
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Showing 2 changed files with 14 additions and 6 deletions.
diff --git a/EPD/EPD_Test.h b/EPD/EPD_Test.h
diff --git a/html/js/main.js b/html/js/main.js
@@ -8,6 +8,7 @@ let canvas;
 let startTime;
 
 const MAX_PACKET_SIZE = 20;
+const INTERLEAVED_COUNT = 50;
 const EpdCmd = {
   SET_PINS:  0x00,
   INIT:      0x01,
@@ -45,7 +46,7 @@ async function handleError(error) {
   }
 }
 
-async function write(cmd, data) {
+async function write(cmd, data, withResponse=true) {
   if (!epdCharacteristic) {
     addLog("服务不可用，请检查蓝牙连接");
     return;
@@ -60,21 +61,31 @@ async function write(cmd, data) {
     throw new Error("BLE packet too large!");
   }
   addLog(`<span class="action">⇑</span> ${bytes2hex(payload)}`);
-  await epdCharacteristic.writeValue(Uint8Array.from(payload));
+  if (withResponse)
+    await epdCharacteristic.writeValueWithResponse(Uint8Array.from(payload));
+  else
+    await epdCharacteristic.writeValueWithoutResponse(Uint8Array.from(payload));
 }
 
 async function epdWrite(cmd, data) {
   const chunkSize = MAX_PACKET_SIZE - 1;
   const count = Math.round(data.length / chunkSize);
   let chunkIdx = 0;
+  let noReplyCount = INTERLEAVED_COUNT;
 
   if (typeof data == 'string') data = hex2bytes(data);
 
   await write(EpdCmd.SEND_CMD, [cmd]);
   for (let i = 0; i < data.length; i += chunkSize) {
     let currentTime = (new Date().getTime() - startTime) / 1000.0;
     setStatus(`命令：0x${cmd.toString(16)}, 数据块: ${chunkIdx+1}/${count+1}, 总用时: ${currentTime}s`);
-    await write(EpdCmd.SEND_DATA, data.slice(i, i + chunkSize));
+    if (noReplyCount > 0) {
+      await write(EpdCmd.SEND_DATA, data.slice(i, i + chunkSize), false);
+      noReplyCount--;
+    } else {
+      await write(EpdCmd.SEND_DATA, data.slice(i, i + chunkSize), true);
+      noReplyCount = INTERLEAVED_COUNT;
+    }
     chunkIdx++;
   }
 }