743 lines
15 KiB
HTML
743 lines
15 KiB
HTML
<!DOCTYPE html>
|
||
<html>
|
||
<head>
|
||
<title>README.md</title>
|
||
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
|
||
|
||
<style>
|
||
/* https://github.com/microsoft/vscode/blob/master/extensions/markdown-language-features/media/markdown.css */
|
||
/*---------------------------------------------------------------------------------------------
|
||
* Copyright (c) Microsoft Corporation. All rights reserved.
|
||
* Licensed under the MIT License. See License.txt in the project root for license information.
|
||
*--------------------------------------------------------------------------------------------*/
|
||
|
||
body {
|
||
font-family: var(--vscode-markdown-font-family, -apple-system, BlinkMacSystemFont, "Segoe WPC", "Segoe UI", "Ubuntu", "Droid Sans", sans-serif);
|
||
font-size: var(--vscode-markdown-font-size, 14px);
|
||
padding: 0 26px;
|
||
line-height: var(--vscode-markdown-line-height, 22px);
|
||
word-wrap: break-word;
|
||
}
|
||
|
||
#code-csp-warning {
|
||
position: fixed;
|
||
top: 0;
|
||
right: 0;
|
||
color: white;
|
||
margin: 16px;
|
||
text-align: center;
|
||
font-size: 12px;
|
||
font-family: sans-serif;
|
||
background-color:#444444;
|
||
cursor: pointer;
|
||
padding: 6px;
|
||
box-shadow: 1px 1px 1px rgba(0,0,0,.25);
|
||
}
|
||
|
||
#code-csp-warning:hover {
|
||
text-decoration: none;
|
||
background-color:#007acc;
|
||
box-shadow: 2px 2px 2px rgba(0,0,0,.25);
|
||
}
|
||
|
||
body.scrollBeyondLastLine {
|
||
margin-bottom: calc(100vh - 22px);
|
||
}
|
||
|
||
body.showEditorSelection .code-line {
|
||
position: relative;
|
||
}
|
||
|
||
body.showEditorSelection .code-active-line:before,
|
||
body.showEditorSelection .code-line:hover:before {
|
||
content: "";
|
||
display: block;
|
||
position: absolute;
|
||
top: 0;
|
||
left: -12px;
|
||
height: 100%;
|
||
}
|
||
|
||
body.showEditorSelection li.code-active-line:before,
|
||
body.showEditorSelection li.code-line:hover:before {
|
||
left: -30px;
|
||
}
|
||
|
||
.vscode-light.showEditorSelection .code-active-line:before {
|
||
border-left: 3px solid rgba(0, 0, 0, 0.15);
|
||
}
|
||
|
||
.vscode-light.showEditorSelection .code-line:hover:before {
|
||
border-left: 3px solid rgba(0, 0, 0, 0.40);
|
||
}
|
||
|
||
.vscode-light.showEditorSelection .code-line .code-line:hover:before {
|
||
border-left: none;
|
||
}
|
||
|
||
.vscode-dark.showEditorSelection .code-active-line:before {
|
||
border-left: 3px solid rgba(255, 255, 255, 0.4);
|
||
}
|
||
|
||
.vscode-dark.showEditorSelection .code-line:hover:before {
|
||
border-left: 3px solid rgba(255, 255, 255, 0.60);
|
||
}
|
||
|
||
.vscode-dark.showEditorSelection .code-line .code-line:hover:before {
|
||
border-left: none;
|
||
}
|
||
|
||
.vscode-high-contrast.showEditorSelection .code-active-line:before {
|
||
border-left: 3px solid rgba(255, 160, 0, 0.7);
|
||
}
|
||
|
||
.vscode-high-contrast.showEditorSelection .code-line:hover:before {
|
||
border-left: 3px solid rgba(255, 160, 0, 1);
|
||
}
|
||
|
||
.vscode-high-contrast.showEditorSelection .code-line .code-line:hover:before {
|
||
border-left: none;
|
||
}
|
||
|
||
img {
|
||
max-width: 100%;
|
||
max-height: 100%;
|
||
}
|
||
|
||
a {
|
||
text-decoration: none;
|
||
}
|
||
|
||
a:hover {
|
||
text-decoration: underline;
|
||
}
|
||
|
||
a:focus,
|
||
input:focus,
|
||
select:focus,
|
||
textarea:focus {
|
||
outline: 1px solid -webkit-focus-ring-color;
|
||
outline-offset: -1px;
|
||
}
|
||
|
||
hr {
|
||
border: 0;
|
||
height: 2px;
|
||
border-bottom: 2px solid;
|
||
}
|
||
|
||
h1 {
|
||
padding-bottom: 0.3em;
|
||
line-height: 1.2;
|
||
border-bottom-width: 1px;
|
||
border-bottom-style: solid;
|
||
}
|
||
|
||
h1, h2, h3 {
|
||
font-weight: normal;
|
||
}
|
||
|
||
table {
|
||
border-collapse: collapse;
|
||
}
|
||
|
||
table > thead > tr > th {
|
||
text-align: left;
|
||
border-bottom: 1px solid;
|
||
}
|
||
|
||
table > thead > tr > th,
|
||
table > thead > tr > td,
|
||
table > tbody > tr > th,
|
||
table > tbody > tr > td {
|
||
padding: 5px 10px;
|
||
}
|
||
|
||
table > tbody > tr + tr > td {
|
||
border-top: 1px solid;
|
||
}
|
||
|
||
blockquote {
|
||
margin: 0 7px 0 5px;
|
||
padding: 0 16px 0 10px;
|
||
border-left-width: 5px;
|
||
border-left-style: solid;
|
||
}
|
||
|
||
code {
|
||
font-family: Menlo, Monaco, Consolas, "Droid Sans Mono", "Courier New", monospace, "Droid Sans Fallback";
|
||
font-size: 1em;
|
||
line-height: 1.357em;
|
||
}
|
||
|
||
body.wordWrap pre {
|
||
white-space: pre-wrap;
|
||
}
|
||
|
||
pre:not(.hljs),
|
||
pre.hljs code > div {
|
||
padding: 16px;
|
||
border-radius: 3px;
|
||
overflow: auto;
|
||
}
|
||
|
||
pre code {
|
||
color: var(--vscode-editor-foreground);
|
||
tab-size: 4;
|
||
}
|
||
|
||
/** Theming */
|
||
|
||
.vscode-light pre {
|
||
background-color: rgba(220, 220, 220, 0.4);
|
||
}
|
||
|
||
.vscode-dark pre {
|
||
background-color: rgba(10, 10, 10, 0.4);
|
||
}
|
||
|
||
.vscode-high-contrast pre {
|
||
background-color: rgb(0, 0, 0);
|
||
}
|
||
|
||
.vscode-high-contrast h1 {
|
||
border-color: rgb(0, 0, 0);
|
||
}
|
||
|
||
.vscode-light table > thead > tr > th {
|
||
border-color: rgba(0, 0, 0, 0.69);
|
||
}
|
||
|
||
.vscode-dark table > thead > tr > th {
|
||
border-color: rgba(255, 255, 255, 0.69);
|
||
}
|
||
|
||
.vscode-light h1,
|
||
.vscode-light hr,
|
||
.vscode-light table > tbody > tr + tr > td {
|
||
border-color: rgba(0, 0, 0, 0.18);
|
||
}
|
||
|
||
.vscode-dark h1,
|
||
.vscode-dark hr,
|
||
.vscode-dark table > tbody > tr + tr > td {
|
||
border-color: rgba(255, 255, 255, 0.18);
|
||
}
|
||
|
||
</style>
|
||
|
||
<style>
|
||
/* Tomorrow Theme */
|
||
/* http://jmblog.github.com/color-themes-for-google-code-highlightjs */
|
||
/* Original theme - https://github.com/chriskempson/tomorrow-theme */
|
||
|
||
/* Tomorrow Comment */
|
||
.hljs-comment,
|
||
.hljs-quote {
|
||
color: #8e908c;
|
||
}
|
||
|
||
/* Tomorrow Red */
|
||
.hljs-variable,
|
||
.hljs-template-variable,
|
||
.hljs-tag,
|
||
.hljs-name,
|
||
.hljs-selector-id,
|
||
.hljs-selector-class,
|
||
.hljs-regexp,
|
||
.hljs-deletion {
|
||
color: #c82829;
|
||
}
|
||
|
||
/* Tomorrow Orange */
|
||
.hljs-number,
|
||
.hljs-built_in,
|
||
.hljs-builtin-name,
|
||
.hljs-literal,
|
||
.hljs-type,
|
||
.hljs-params,
|
||
.hljs-meta,
|
||
.hljs-link {
|
||
color: #f5871f;
|
||
}
|
||
|
||
/* Tomorrow Yellow */
|
||
.hljs-attribute {
|
||
color: #eab700;
|
||
}
|
||
|
||
/* Tomorrow Green */
|
||
.hljs-string,
|
||
.hljs-symbol,
|
||
.hljs-bullet,
|
||
.hljs-addition {
|
||
color: #718c00;
|
||
}
|
||
|
||
/* Tomorrow Blue */
|
||
.hljs-title,
|
||
.hljs-section {
|
||
color: #4271ae;
|
||
}
|
||
|
||
/* Tomorrow Purple */
|
||
.hljs-keyword,
|
||
.hljs-selector-tag {
|
||
color: #8959a8;
|
||
}
|
||
|
||
.hljs {
|
||
display: block;
|
||
overflow-x: auto;
|
||
color: #4d4d4c;
|
||
padding: 0.5em;
|
||
}
|
||
|
||
.hljs-emphasis {
|
||
font-style: italic;
|
||
}
|
||
|
||
.hljs-strong {
|
||
font-weight: bold;
|
||
}
|
||
</style>
|
||
|
||
<style>
|
||
/*
|
||
* Markdown PDF CSS
|
||
*/
|
||
|
||
body {
|
||
font-family: -apple-system, BlinkMacSystemFont, "Segoe WPC", "Segoe UI", "Ubuntu", "Droid Sans", sans-serif, "Meiryo";
|
||
padding: 0 12px;
|
||
}
|
||
|
||
pre {
|
||
background-color: #f8f8f8;
|
||
border: 1px solid #cccccc;
|
||
border-radius: 3px;
|
||
overflow-x: auto;
|
||
white-space: pre-wrap;
|
||
overflow-wrap: break-word;
|
||
}
|
||
|
||
pre:not(.hljs) {
|
||
padding: 23px;
|
||
line-height: 19px;
|
||
}
|
||
|
||
blockquote {
|
||
background: rgba(127, 127, 127, 0.1);
|
||
border-color: rgba(0, 122, 204, 0.5);
|
||
}
|
||
|
||
.emoji {
|
||
height: 1.4em;
|
||
}
|
||
|
||
code {
|
||
font-size: 14px;
|
||
line-height: 19px;
|
||
}
|
||
|
||
/* for inline code */
|
||
:not(pre):not(.hljs) > code {
|
||
color: #C9AE75; /* Change the old color so it seems less like an error */
|
||
font-size: inherit;
|
||
}
|
||
|
||
/* Page Break : use <div class="page"/> to insert page break
|
||
-------------------------------------------------------- */
|
||
.page {
|
||
page-break-after: always;
|
||
}
|
||
|
||
</style>
|
||
|
||
<script src="https://unpkg.com/mermaid/dist/mermaid.min.js"></script>
|
||
</head>
|
||
<body>
|
||
<script>
|
||
mermaid.initialize({
|
||
startOnLoad: true,
|
||
theme: document.body.classList.contains('vscode-dark') || document.body.classList.contains('vscode-high-contrast')
|
||
? 'dark'
|
||
: 'default'
|
||
});
|
||
</script>
|
||
<h1 id="%E5%BC%95%E8%84%9A%E6%8E%92%E5%88%97">引脚排列</h1>
|
||
<p><img src="./pin" alt="引脚定义"></p>
|
||
<h1 id="%E4%BD%BF%E7%94%A8%E6%B3%A8%E6%84%8F">使用注意：</h1>
|
||
<pre><code>1. TF卡和SPI Flash只支持一个，下单请注意备注。
|
||
2. 开机有提示音“咚”。
|
||
3. 默认循环方式为不循环，播放一次后结束。
|
||
4. BUSY引脚指示当前播放状态，低电平为正在播放，高电平为未播放，也可使用此引脚控制功放的MUTE，但需实测是否有呑字现象。
|
||
</code></pre>
|
||
<h2 id="uart-%E9%80%9A%E8%AE%AF%E5%8D%8F%E8%AE%AE-115200-n-8-1">UART 通讯协议 115200 N 8 1</h2>
|
||
<ul>
|
||
<li>发送
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>head</th>
|
||
<th>length</th>
|
||
<th>CMD</th>
|
||
<th>DATA</th>
|
||
<th>XOR</th>
|
||
<th>tail</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>02</td>
|
||
<td>04</td>
|
||
<td>A0</td>
|
||
<td>01</td>
|
||
<td>FF</td>
|
||
<td>03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</li>
|
||
<li>回复
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>head</th>
|
||
<th>length</th>
|
||
<th>CMD</th>
|
||
<th>ERR</th>
|
||
<th>XOR</th>
|
||
<th>tail</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>02</td>
|
||
<td>04</td>
|
||
<td>A0</td>
|
||
<td>00</td>
|
||
<td>FF</td>
|
||
<td>03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</li>
|
||
<li>解释：
|
||
<ul>
|
||
<li>heat：帧头 一个字节 0x02</li>
|
||
<li>tail：帧尾 一个字节 0x03</li>
|
||
<li>length：长度 一个字节 从长度到校验的长度，包含长度和校验</li>
|
||
<li>CMD：命令字 一个字节</li>
|
||
<li>DATA：数据区，不定长</li>
|
||
<li>XOR：校验，一个字节的xor校验,调试可以填写一个字节FF，当此字节为FF时，为不校验</li>
|
||
</ul>
|
||
</li>
|
||
<li>指令列表：
|
||
<ul>
|
||
<li>0xA0 播放</li>
|
||
<li>0xA1 暂停</li>
|
||
<li>0xA2 播放/暂停</li>
|
||
<li>0xA3 下一曲</li>
|
||
<li>0xA4 上一曲</li>
|
||
<li>0xA5 停止</li>
|
||
<li>0xA6 音量加</li>
|
||
<li>0xA7 音量减</li>
|
||
<li>0xA8 设置音量</li>
|
||
<li>0xA9 静音</li>
|
||
<li>0xAA 解除静音</li>
|
||
<li>0xAB 播放指定曲目(通配符)</li>
|
||
<li>0xAC 播放指定曲目（带扩展名）</li>
|
||
<li>0xAD 播放指定曲目（数字）</li>
|
||
<li>0xAE 播放循环</li>
|
||
<li>0xB0 获取当前磁盘文件总数</li>
|
||
<li>0xB1 获取当前磁盘文件夹数量</li>
|
||
<li>0xB2 获取当前播放文件夹内文件数量</li>
|
||
<li>0xB3 获取当前播放曲目总时间</li>
|
||
<li>0xB4 获取当前播放曲目时间</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<h2 id="%E6%8C%87%E4%BB%A4%E8%AF%A6%E8%BF%B0">指令详述</h2>
|
||
<ul>
|
||
<li>播放控制指令：0xA0/A1/A2/A3/A4/A5/A6/A7/A9/AA
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>HEAD</th>
|
||
<th>LENGTH</th>
|
||
<th>CMD</th>
|
||
<th>CHK</th>
|
||
<th>TAIL</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>0x02</td>
|
||
<td>1Byte</td>
|
||
<td>0xA0</td>
|
||
<td>1Byte</td>
|
||
<td>0x03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</li>
|
||
<li>播放循环：0xAE
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>HEAD</th>
|
||
<th>LENGTH</th>
|
||
<th>CMD</th>
|
||
<th>CYCLE</th>
|
||
<th>CHK</th>
|
||
<th>TAIL</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>0x02</td>
|
||
<td>1Byte</td>
|
||
<td>0xAE</td>
|
||
<td>1Byte</td>
|
||
<td>1Byte</td>
|
||
<td>0x03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<ul>
|
||
<li>CYCLE ：0-不循环，1-全部循环 2-单曲循环，3-文件夹循环，4-随机</li>
|
||
</ul>
|
||
</li>
|
||
<li>设置音量：0xA8
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>HEAD</th>
|
||
<th>LENGTH</th>
|
||
<th>CMD</th>
|
||
<th>VOLUME</th>
|
||
<th>CHK</th>
|
||
<th>TAIL</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>0x02</td>
|
||
<td>1Byte</td>
|
||
<td>0xA8</td>
|
||
<td>0-30</td>
|
||
<td>1Byte</td>
|
||
<td>0x03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<ul>
|
||
<li>VOLUME ： 0-30</li>
|
||
</ul>
|
||
</li>
|
||
<li>播放指定曲目(通配符)：AB
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>HEAD</th>
|
||
<th>LENGTH</th>
|
||
<th>CMD</th>
|
||
<th>STA</th>
|
||
<th>NAME</th>
|
||
<th>END</th>
|
||
<th>CHK</th>
|
||
<th>TAIL</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>0x02</td>
|
||
<td>1Byte</td>
|
||
<td>0xAB</td>
|
||
<td>'$'</td>
|
||
<td>'abc'</td>
|
||
<td>'$'</td>
|
||
<td>1Byte</td>
|
||
<td>0x03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<ul>
|
||
<li>STA ：名字起始，字符'$'(0x24)。</li>
|
||
<li>END : 名字结束，字符'$'(0x24)。</li>
|
||
<li>NAME ：名字字符串，支持通配符,注:会自动增加扩展名，实例为3字节‘abc’（61 62 63）,<code>实际上是播放 "abc.*", 程序自动增加 ".*" 通配符扩展名，"ab*"也是合法的，会播放"ab*.*"</code></li>
|
||
<li>文件必须存在否则播放失败</li>
|
||
</ul>
|
||
</li>
|
||
<li>播放指定曲目(全路径)：AC
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>HEAD</th>
|
||
<th>LENGTH</th>
|
||
<th>CMD</th>
|
||
<th>STA</th>
|
||
<th>NAME</th>
|
||
<th>END</th>
|
||
<th>CHK</th>
|
||
<th>TAIL</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>0x02</td>
|
||
<td>1Byte</td>
|
||
<td>0xAC</td>
|
||
<td>'$'</td>
|
||
<td>'abc.mp3'</td>
|
||
<td>'$'</td>
|
||
<td>1Byte</td>
|
||
<td>0x03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<ul>
|
||
<li>STA ：名字起始，字符'$'(0x24)。</li>
|
||
<li>END : 名字结束，字符'$'(0x24)。</li>
|
||
<li>NAME ：名字字符串,必须写全文件名，例如：文件名采用8+3格式，例如：01.mp3和001.mp3是不同的</li>
|
||
<li>文件必须存在否则播放失败</li>
|
||
</ul>
|
||
</li>
|
||
<li>播放指定曲目(文件号)：AD
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>HEAD</th>
|
||
<th>LENGTH</th>
|
||
<th>CMD</th>
|
||
<th>FH</th>
|
||
<th>FL</th>
|
||
<th>CHK</th>
|
||
<th>TAIL</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>0x02</td>
|
||
<td>1Byte</td>
|
||
<td>0xAD</td>
|
||
<td>1Byte</td>
|
||
<td>1Byte</td>
|
||
<td>1Byte</td>
|
||
<td>0x03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<ul>
|
||
<li>FH，FL：组合成一个16bit的整形，例如 FH=0x00 FL=0x02 实际上是播放0x0002曲目，曲目的顺序号是拷贝进磁盘的顺序</li>
|
||
<li>文件必须存在否则播放失败</li>
|
||
</ul>
|
||
</li>
|
||
<li>播放信息：B0/B1/B2/B3/B4
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>HEAD</th>
|
||
<th>LENGTH</th>
|
||
<th>CMD</th>
|
||
<th>CHK</th>
|
||
<th>TAIL</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>0x02</td>
|
||
<td>1Byte</td>
|
||
<td>0xB0</td>
|
||
<td>1Byte</td>
|
||
<td>0x03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</li>
|
||
<li>ACK:
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>HEAD</th>
|
||
<th>LENGTH</th>
|
||
<th>CMD</th>
|
||
<th>ERR</th>
|
||
<th>DH</th>
|
||
<th>DL</th>
|
||
<th>CHK</th>
|
||
<th>TAIL</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>0x02</td>
|
||
<td>1Byte</td>
|
||
<td>0xB0</td>
|
||
<td>1Byte</td>
|
||
<td>1Byte</td>
|
||
<td>1Byte</td>
|
||
<td>1Byte</td>
|
||
<td>0x03</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<ul>
|
||
<li>DH,DL: 回复数据，组合成一个16bit的整形，例如 DH=0x00 DL=0x02 则值是0x0002</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<h2 id="%E9%99%84%E5%BD%951%E6%A0%A1%E9%AA%8C">附录1：校验</h2>
|
||
<ul>
|
||
<li>校验方式为校验和，计算方式为数据累计和取反加1的方式</li>
|
||
<li>举例发送系统复位指令A0：0x02 0x02 0xA0 CheckSum 0x03
|
||
<ul>
|
||
<li>其中头尾分别为02 03</li>
|
||
<li>计算：第二个02 + 指令A0，相加，结果取反再+1，得到CheckSum</li>
|
||
<li>校验：数据段+校验后的值为0</li>
|
||
<li>详细算法<pre class="hljs"><code><div> <span class="hljs-keyword">uint8_t</span> buf[<span class="hljs-number">16</span>];
|
||
<span class="hljs-keyword">int</span> index = <span class="hljs-number">0</span>;
|
||
buf[index++] = <span class="hljs-number">0x02</span>; <span class="hljs-comment">//头</span>
|
||
buf[index++] = <span class="hljs-number">0x00</span>; <span class="hljs-comment">//长度，临时赋值0</span>
|
||
buf[index++] = <span class="hljs-number">0xA0</span>; <span class="hljs-comment">//指令</span>
|
||
|
||
buf[<span class="hljs-number">1</span>] = index - <span class="hljs-number">1</span>; <span class="hljs-comment">//数据填充完成后，重新赋值长度(0x02)</span>
|
||
|
||
<span class="hljs-keyword">uint16_t</span> sum = <span class="hljs-number">0</span>;
|
||
|
||
<span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < index - <span class="hljs-number">1</span>; i++)
|
||
{
|
||
sum += buf[<span class="hljs-number">1</span>+i]; <span class="hljs-comment">//从第一个字节开始累加，去除头,</span>
|
||
}
|
||
|
||
<span class="hljs-comment">//此时累加完成，sum：0x02 + 0xA0 = 0xA2</span>
|
||
|
||
sum = ~sum + <span class="hljs-number">1</span>; <span class="hljs-comment">//取反加1</span>
|
||
<span class="hljs-comment">//sum = 0xff5D + 1 = 0xff5E</span>
|
||
|
||
buf[index++] = (u8)sum; <span class="hljs-comment">//强制转换成uint8_t类型,截断后为 0x5E</span>
|
||
buf[index++] = <span class="hljs-number">0x03</span>; <span class="hljs-comment">//尾</span>
|
||
|
||
<span class="hljs-comment">//此时buf = {0x02,0x02,0xA0,0x5E,0x03}</span>
|
||
|
||
<span class="hljs-comment">//下面校验</span>
|
||
<span class="hljs-comment">//0x02 + 0xA0 + 0x5E = 0x0100</span>
|
||
<span class="hljs-comment">//将0x100强转为uint8_t后，截断后 = 0，校验通过</span>
|
||
</div></code></pre>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
<h2 id="%E9%99%84%E5%BD%952-errcode-%E9%94%99%E8%AF%AF%E5%AE%9A%E4%B9%89">附录2 ：ERRCODE 错误定义：</h2>
|
||
<pre><code>- 0：指令正确，数据正确，且执行正确
|
||
- 1：一个通用的错误，可能是一个未定义的错误
|
||
- 2：未识别的指令
|
||
- 3：参数错误
|
||
- 4：帧错误，此包数据未找到帧头，或者未找到帧尾
|
||
- 5：长度错误
|
||
- 6：校验错误</code></pre>
|
||
|
||
</body>
|
||
</html>
|