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zh-cn/device-dev/driver/driver-platform-uart-des.md
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# UART<a name="ZH-CN_TOPIC_0000001160652800"></a>
- [概述](#section833012453535)
- [接口说明](#section1928742202715)
- [使用指导](#section12779050105412)
- [使用流程](#section1858116395510)
- [获取UART设备句柄](#section124512065617)
- [UART设置波特率](#section86881004579)
- [UART获取波特率](#section897032965712)
- [UART设置设备属性](#section129141884588)
- [UART获取设备属性](#section18689637165812)
- [设置UART传输模式](#section72713435918)
- [向UART设备写入指定长度的数据](#section128001736155919)
- [从UART设备中读取指定长度的数据](#section92851601604)
- [销毁UART设备句柄](#section1477410521406)
- [使用实例](#section35404241311)
## 概述<a name="section833012453535"></a>
- UART是通用异步收发传输器（Universal Asynchronous Receiver/Transmitter）的缩写，是通用串行数据总线，用于异步通信。该总线双向通信，可以实现全双工传输。
- UART应用比较广泛，常用于输出打印信息，也可以外接各种模块，如GPS、蓝牙等。
- 两个UART设备的连接示意图如下，UART与其他模块一般用2线（图1）或4线（图2）相连，它们分别是：
- TX：发送数据端，和对端的RX相连；
- RX：接收数据端，和对端的TX相连；
- RTS：发送请求信号，用于指示本设备是否准备好，可接受数据，和对端CTS相连；
- CTS：允许发送信号，用于判断是否可以向对端发送数据，和对端RTS相连；
## 概述
UART指异步收发传输器（Universal Asynchronous Receiver/Transmitter），是通用串行数据总线，用于异步通信。该总线双向通信，可以实现全双工传输。
UART应用比较广泛，常用于输出打印信息，也可以外接各种模块，如GPS、蓝牙等。
两个UART设备的连接示意图如下，UART与其他模块一般用2线（图1）或4线（图2）相连，它们分别是：
- TX：发送数据端，和对端的RX相连。
- RX：接收数据端，和对端的TX相连。
- RTS：发送请求信号，用于指示本设备是否准备好，可接受数据，和对端CTS相连。
- CTS：允许发送信号，用于判断是否可以向对端发送数据，和对端RTS相连。
**图 1** 2线UART设备连接示意图<a name="fig68294715408"></a>
![](figures/2线UART设备连接示意图.png "2线UART设备连接示意图")
......@@ -40,75 +27,17 @@
**表 1** UART驱动API接口功能介绍
<a name="table1731550155318"></a>
<table><thead align="left"><tr id="row1223152681611"><th class="cellrowborder" valign="top" width="26.619999999999997%" id="mcps1.2.4.1.1"><p id="p210413571619"><a name="p210413571619"></a><a name="p210413571619"></a>功能分类</p>
</th>
<th class="cellrowborder" valign="top" width="31.369999999999997%" id="mcps1.2.4.1.2"><p id="p810403511614"><a name="p810403511614"></a><a name="p810403511614"></a>接口名</p>
</th>
<th class="cellrowborder" valign="top" width="42.01%" id="mcps1.2.4.1.3"><p id="p110418354161"><a name="p110418354161"></a><a name="p110418354161"></a>描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row1638573613415"><td class="cellrowborder" rowspan="2" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><p id="p917154316414"><a name="p917154316414"></a><a name="p917154316414"></a>UART获取/释放设备句柄</p>
<p id="p9596111154212"><a name="p9596111154212"></a><a name="p9596111154212"></a></p>
</td>
<td class="cellrowborder" valign="top" width="31.369999999999997%" headers="mcps1.2.4.1.2 "><p id="p20385163614412"><a name="p20385163614412"></a><a name="p20385163614412"></a>UartOpen</p>
</td>
<td class="cellrowborder" valign="top" width="42.01%" headers="mcps1.2.4.1.3 "><p id="p12101135184213"><a name="p12101135184213"></a><a name="p12101135184213"></a>UART获取设备句柄</p>
</td>
</tr>
<tr id="row5950143316415"><td class="cellrowborder" valign="top" headers="mcps1.2.4.1.1 "><p id="p149501733134113"><a name="p149501733134113"></a><a name="p149501733134113"></a>UartClose</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.2.4.1.2 "><p id="p371073520422"><a name="p371073520422"></a><a name="p371073520422"></a>UART释放设备句柄</p>
</td>
</tr>
<tr id="row34145016535"><td class="cellrowborder" rowspan="2" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><p id="p229610227124"><a name="p229610227124"></a><a name="p229610227124"></a>UART读写接口</p>
<p id="p131072201215"><a name="p131072201215"></a><a name="p131072201215"></a></p>
</td>
<td class="cellrowborder" valign="top" width="31.369999999999997%" headers="mcps1.2.4.1.2 "><p id="p8296182221219"><a name="p8296182221219"></a><a name="p8296182221219"></a>UartRead</p>
</td>
<td class="cellrowborder" valign="top" width="42.01%" headers="mcps1.2.4.1.3 "><p id="p16297172213125"><a name="p16297172213125"></a><a name="p16297172213125"></a>从UART设备中读取指定长度的数据</p>
</td>
</tr>
<tr id="row11585016539"><td class="cellrowborder" valign="top" headers="mcps1.2.4.1.1 "><p id="p1095722493616"><a name="p1095722493616"></a><a name="p1095722493616"></a>UartWrite</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.2.4.1.2 "><p id="p15297162215122"><a name="p15297162215122"></a><a name="p15297162215122"></a>向UART设备中写入指定长度的数据</p>
</td>
</tr>
<tr id="row8687115843715"><td class="cellrowborder" rowspan="2" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><p id="p196317143813"><a name="p196317143813"></a><a name="p196317143813"></a>UART获取/设置波特率接口</p>
</td>
<td class="cellrowborder" valign="top" width="31.369999999999997%" headers="mcps1.2.4.1.2 "><p id="p166885582375"><a name="p166885582375"></a><a name="p166885582375"></a>UartGetBaud</p>
</td>
<td class="cellrowborder" valign="top" width="42.01%" headers="mcps1.2.4.1.3 "><p id="p13688358183716"><a name="p13688358183716"></a><a name="p13688358183716"></a>UART获取波特率</p>
</td>
</tr>
<tr id="row18987529382"><td class="cellrowborder" valign="top" headers="mcps1.2.4.1.1 "><p id="p698719214383"><a name="p698719214383"></a><a name="p698719214383"></a>UartSetBaud</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.2.4.1.2 "><p id="p1398712123810"><a name="p1398712123810"></a><a name="p1398712123810"></a>UART设置波特率</p>
</td>
</tr>
<tr id="row1551850115317"><td class="cellrowborder" rowspan="2" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><p id="p1629782201218"><a name="p1629782201218"></a><a name="p1629782201218"></a>UART获取/设置设备属性</p>
<p id="p10308192211216"><a name="p10308192211216"></a><a name="p10308192211216"></a></p>
</td>
<td class="cellrowborder" valign="top" width="31.369999999999997%" headers="mcps1.2.4.1.2 "><p id="p32972022151218"><a name="p32972022151218"></a><a name="p32972022151218"></a>UartGetAttribute</p>
</td>
<td class="cellrowborder" valign="top" width="42.01%" headers="mcps1.2.4.1.3 "><p id="p13297122216123"><a name="p13297122216123"></a><a name="p13297122216123"></a>UART获取设备属性</p>
</td>
</tr>
<tr id="row7545065311"><td class="cellrowborder" valign="top" headers="mcps1.2.4.1.1 "><p id="p102974224120"><a name="p102974224120"></a><a name="p102974224120"></a>UartSetAttribute</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.2.4.1.2 "><p id="p152971322111219"><a name="p152971322111219"></a><a name="p152971322111219"></a>UART设置设备属性</p>
</td>
</tr>
<tr id="row14614115403"><td class="cellrowborder" valign="top" width="26.619999999999997%" headers="mcps1.2.4.1.1 "><p id="p1746281144010"><a name="p1746281144010"></a><a name="p1746281144010"></a>UART设置传输模式</p>
</td>
<td class="cellrowborder" valign="top" width="31.369999999999997%" headers="mcps1.2.4.1.2 "><p id="p1146215112405"><a name="p1146215112405"></a><a name="p1146215112405"></a>UartSetTransMode</p>
</td>
<td class="cellrowborder" valign="top" width="42.01%" headers="mcps1.2.4.1.3 "><p id="p11303181216414"><a name="p11303181216414"></a><a name="p11303181216414"></a>UART设置传输模式</p>
</td>
</tr>
</tbody>
</table>
| 接口名 | 接口描述 |
| -------- | -------- |
| UartOpen | UART获取设备句柄 |
| UartClose | UART释放设备句柄 |
| UartRead | 从UART设备中读取指定长度的数据 |
| UartWrite | 向UART设备中写入指定长度的数据 |
| UartGetBaud | UART获取波特率 |
| UartSetBaud | UART设置波特率 |
| UartGetAttribute | UART获取设备属性 |
| UartSetAttribute | UART设置设备属性 |
| UartSetTransMode | UART设置传输模式 |
>![](../public_sys-resources/icon-note.gif) **说明：**
>本文涉及的所有接口，仅限内核态使用，不支持在用户态使用。
......@@ -130,35 +59,12 @@ DevHandle UartOpen\(uint32\_t port\);
**表 2** UartOpen参数和返回值描述
<a name="table14222165114310"></a>
<table><thead align="left"><tr id="row1022175133111"><th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.1"><p id="p13221551153117"><a name="p13221551153117"></a><a name="p13221551153117"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.2"><p id="p122211251103111"><a name="p122211251103111"></a><a name="p122211251103111"></a>参数描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row6222451133114"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p92221518315"><a name="p92221518315"></a><a name="p92221518315"></a>port</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p1322217518318"><a name="p1322217518318"></a><a name="p1322217518318"></a>UART设备号</p>
</td>
</tr>
<tr id="row1122245153112"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p102221451123118"><a name="p102221451123118"></a><a name="p102221451123118"></a><strong id="b1922235110318"><a name="b1922235110318"></a><a name="b1922235110318"></a>返回值</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p1122215143113"><a name="p1122215143113"></a><a name="p1122215143113"></a><strong id="b19222205193117"><a name="b19222205193117"></a><a name="b19222205193117"></a>返回值描述</strong></p>
</td>
</tr>
<tr id="row522275114317"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p422235114313"><a name="p422235114313"></a><a name="p422235114313"></a>NULL</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p5222351203112"><a name="p5222351203112"></a><a name="p5222351203112"></a>获取UART设备句柄失败</p>
</td>
</tr>
<tr id="row1222212513311"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p5222125115316"><a name="p5222125115316"></a><a name="p5222125115316"></a>设备句柄</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p192228515311"><a name="p192228515311"></a><a name="p192228515311"></a>UART设备句柄</p>
</td>
</tr>
</tbody>
</table>
| 参数 | 参数描述 |
| -------- | -------- |
| port | UART设备号 |
| **返回值** | **返回值描述** |
| NULL | 获取UART设备句柄失败 |
| 设备句柄 | UART设备句柄 |
假设系统中的UART端口号为3，获取该UART设备句柄的示例如下：
......@@ -180,42 +86,15 @@ int32\_t UartSetBaud\(DevHandle handle, uint32\_t baudRate\);
**表 3** UartSetBaud参数和返回值描述
<a name="table539135313325"></a>
<table><thead align="left"><tr id="row15391205311323"><th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.1"><p id="p11390453103216"><a name="p11390453103216"></a><a name="p11390453103216"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.2"><p id="p839065316328"><a name="p839065316328"></a><a name="p839065316328"></a>参数描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row2039115373216"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p1639165310324"><a name="p1639165310324"></a><a name="p1639165310324"></a>handle</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p539115320328"><a name="p539115320328"></a><a name="p539115320328"></a>UART设备句柄</p>
</td>
</tr>
<tr id="row163911753143214"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p13911653203215"><a name="p13911653203215"></a><a name="p13911653203215"></a>baudRate</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p163919537322"><a name="p163919537322"></a><a name="p163919537322"></a>待设置的波特率值</p>
</td>
</tr>
<tr id="row539155343218"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p1039185313321"><a name="p1039185313321"></a><a name="p1039185313321"></a><strong id="b139195343217"><a name="b139195343217"></a><a name="b139195343217"></a>返回值</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p123911753143213"><a name="p123911753143213"></a><a name="p123911753143213"></a><strong id="b143911353163218"><a name="b143911353163218"></a><a name="b143911353163218"></a>返回值描述</strong></p>
</td>
</tr>
<tr id="row2391853153218"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p17391185310322"><a name="p17391185310322"></a><a name="p17391185310322"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p14391653193210"><a name="p14391653193210"></a><a name="p14391653193210"></a>UART设置波特率成功</p>
</td>
</tr>
<tr id="row23912053143211"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p7391165320321"><a name="p7391165320321"></a><a name="p7391165320321"></a>负数</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p639185318322"><a name="p639185318322"></a><a name="p639185318322"></a>UART设置波特率失败</p>
</td>
</tr>
</tbody>
</table>
假设需要设置的UART波特率为9600，设置波特率的实例如下：
| 参数 | 参数描述 |
| -------- | -------- |
| handle | UART设备句柄 |
| baudRate | 待设置的波特率值 |
| **返回值** | **返回值描述** |
| 0 | UART设置波特率成功 |
| 负数 | UART设置波特率失败 |
假设需要设置的UART波特率为9600，示例代码如下：
```
int32_t ret;
......@@ -234,42 +113,15 @@ int32\_t UartGetBaud\(DevHandle handle, uint32\_t \*baudRate\);
**表 4** UartGetBaud参数和返回值描述
<a name="table20393185311326"></a>
<table><thead align="left"><tr id="row19392653123215"><th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.1"><p id="p6392105315326"><a name="p6392105315326"></a><a name="p6392105315326"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.2"><p id="p53920531329"><a name="p53920531329"></a><a name="p53920531329"></a>参数描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row103921553103211"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p1539220536326"><a name="p1539220536326"></a><a name="p1539220536326"></a>handle</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p6392553203217"><a name="p6392553203217"></a><a name="p6392553203217"></a>UART设备句柄</p>
</td>
</tr>
<tr id="row1539211532322"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p93921053123210"><a name="p93921053123210"></a><a name="p93921053123210"></a>baudRate</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p93926536328"><a name="p93926536328"></a><a name="p93926536328"></a>接收波特率值的指针</p>
</td>
</tr>
<tr id="row1239318531326"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p17392653123213"><a name="p17392653123213"></a><a name="p17392653123213"></a><strong id="b3392165383219"><a name="b3392165383219"></a><a name="b3392165383219"></a>返回值</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p1339365316327"><a name="p1339365316327"></a><a name="p1339365316327"></a><strong id="b63932053183218"><a name="b63932053183218"></a><a name="b63932053183218"></a>返回值描述</strong></p>
</td>
</tr>
<tr id="row143939531328"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p2393953153213"><a name="p2393953153213"></a><a name="p2393953153213"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p8393165383218"><a name="p8393165383218"></a><a name="p8393165383218"></a>UART获取波特率成功</p>
</td>
</tr>
<tr id="row5393105363210"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p17393125363215"><a name="p17393125363215"></a><a name="p17393125363215"></a>负数</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p1539325393211"><a name="p1539325393211"></a><a name="p1539325393211"></a>UART获取波特率失败</p>
</td>
</tr>
</tbody>
</table>
获取波特率的实例如下：
| 参数 | 参数描述 |
| -------- | -------- |
| handle | UART设备句柄 |
| baudRate | 接收波特率值的指针 |
| **返回值** | **返回值描述** |
| 0 | UART获取波特率成功 |
| 负数 | UART获取波特率失败 |
获取波特率的示例代码如下：
```
int32_t ret;
......@@ -289,42 +141,15 @@ int32\_t UartSetAttribute\(DevHandle handle, struct UartAttribute \*attribute\)
**表 5** UartSetAttribute参数和返回值描述
<a name="table1453119335341"></a>
<table><thead align="left"><tr id="row3530433103416"><th class="cellrowborder" valign="top" width="49.980000000000004%" id="mcps1.2.3.1.1"><p id="p1853073310341"><a name="p1853073310341"></a><a name="p1853073310341"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="50.019999999999996%" id="mcps1.2.3.1.2"><p id="p553083393417"><a name="p553083393417"></a><a name="p553083393417"></a>参数描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row55303331347"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p1530113313341"><a name="p1530113313341"></a><a name="p1530113313341"></a>handle</p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p3530173313346"><a name="p3530173313346"></a><a name="p3530173313346"></a>UART设备句柄</p>
</td>
</tr>
<tr id="row45309337342"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p553083319348"><a name="p553083319348"></a><a name="p553083319348"></a>attribute</p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p5530133314343"><a name="p5530133314343"></a><a name="p5530133314343"></a>待设置的设备属性</p>
</td>
</tr>
<tr id="row12530833103415"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p185309331345"><a name="p185309331345"></a><a name="p185309331345"></a><strong id="b145302033193410"><a name="b145302033193410"></a><a name="b145302033193410"></a>返回值</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p145309332344"><a name="p145309332344"></a><a name="p145309332344"></a><strong id="b553018331348"><a name="b553018331348"></a><a name="b553018331348"></a>返回值描述</strong></p>
</td>
</tr>
<tr id="row14530203310348"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p1653014339343"><a name="p1653014339343"></a><a name="p1653014339343"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p1453023323419"><a name="p1453023323419"></a><a name="p1453023323419"></a>UART设置设备属性成功</p>
</td>
</tr>
<tr id="row6531163373412"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p16530123310345"><a name="p16530123310345"></a><a name="p16530123310345"></a>负数</p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p1953118334347"><a name="p1953118334347"></a><a name="p1953118334347"></a>UART设置设备属性失败</p>
</td>
</tr>
</tbody>
</table>
设置UART的设备属性的实例如下：
| 参数 | 参数描述 |
| -------- | -------- |
| handle | UART设备句柄 |
| attribute | 待设置的设备属性 |
| **返回值** | **返回值描述** |
| 0 | UART设置设备属性成功 |
| 负数 | UART设置设备属性失败 |
设置UART的设备属性的示例代码如下：
```
int32_t ret;
......@@ -351,42 +176,15 @@ int32\_t UartGetAttribute\(DevHandle handle, struct UartAttribute \*attribute\);
**表 6** UartGetAttribute参数和返回值描述
<a name="table17532123316342"></a>
<table><thead align="left"><tr id="row18531193383420"><th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.1"><p id="p85311833143420"><a name="p85311833143420"></a><a name="p85311833143420"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.2"><p id="p17531103319348"><a name="p17531103319348"></a><a name="p17531103319348"></a>参数描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row35311533153413"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p453133333418"><a name="p453133333418"></a><a name="p453133333418"></a>handle</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p753193323420"><a name="p753193323420"></a><a name="p753193323420"></a>UART设备句柄</p>
</td>
</tr>
<tr id="row1953103315344"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p35315333346"><a name="p35315333346"></a><a name="p35315333346"></a>attribute</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p14531633133416"><a name="p14531633133416"></a><a name="p14531633133416"></a>接收UART设备属性的指针</p>
</td>
</tr>
<tr id="row45321433143415"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p653273363417"><a name="p653273363417"></a><a name="p653273363417"></a><strong id="b19531153314349"><a name="b19531153314349"></a><a name="b19531153314349"></a>返回值</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p1653203312347"><a name="p1653203312347"></a><a name="p1653203312347"></a><strong id="b185321330348"><a name="b185321330348"></a><a name="b185321330348"></a>返回值描述</strong></p>
</td>
</tr>
<tr id="row175320339342"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p10532163383412"><a name="p10532163383412"></a><a name="p10532163383412"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p5532143319341"><a name="p5532143319341"></a><a name="p5532143319341"></a>UART获取设备属性成功</p>
</td>
</tr>
<tr id="row125327337340"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p19532153317345"><a name="p19532153317345"></a><a name="p19532153317345"></a>负数</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p175321933163410"><a name="p175321933163410"></a><a name="p175321933163410"></a>UART获取设备属性失败</p>
</td>
</tr>
</tbody>
</table>
获取UART的设备属性的实例如下：
| 参数 | 参数描述 |
| -------- | -------- |
| handle | UART设备句柄 |
| attribute | 接收UART设备属性的指针 |
| **返回值** | **返回值描述** |
| 0 | UART获取设备属性成功 |
| 负数 | UART获取设备属性失败 |
获取UART的设备属性的示例代码如下：
```
int32_t ret;
......@@ -406,42 +204,15 @@ int32\_t UartSetTransMode\(DevHandle handle, enum UartTransMode mode\)；
**表 7** UartSetTransMode参数和返回值描述
<a name="table131892266313"></a>
<table><thead align="left"><tr id="row018922615318"><th class="cellrowborder" valign="top" width="49.980000000000004%" id="mcps1.2.3.1.1"><p id="p131891826835"><a name="p131891826835"></a><a name="p131891826835"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="50.019999999999996%" id="mcps1.2.3.1.2"><p id="p101894269314"><a name="p101894269314"></a><a name="p101894269314"></a>参数描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row11893261734"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p81897261333"><a name="p81897261333"></a><a name="p81897261333"></a>handle</p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p5190142618310"><a name="p5190142618310"></a><a name="p5190142618310"></a>UART设备句柄</p>
</td>
</tr>
<tr id="row1119082615317"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p1519012261314"><a name="p1519012261314"></a><a name="p1519012261314"></a>mode</p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p121901026632"><a name="p121901026632"></a><a name="p121901026632"></a>待设置的传输模式，</p>
</td>
</tr>
<tr id="row19190152612317"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p131900266316"><a name="p131900266316"></a><a name="p131900266316"></a><strong id="b61902026833"><a name="b61902026833"></a><a name="b61902026833"></a>返回值</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p1519022616315"><a name="p1519022616315"></a><a name="p1519022616315"></a><strong id="b319014261837"><a name="b319014261837"></a><a name="b319014261837"></a>返回值描述</strong></p>
</td>
</tr>
<tr id="row919016261932"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p10190526334"><a name="p10190526334"></a><a name="p10190526334"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p1219012264318"><a name="p1219012264318"></a><a name="p1219012264318"></a>UART设置传输模式成功</p>
</td>
</tr>
<tr id="row1219017262313"><td class="cellrowborder" valign="top" width="49.980000000000004%" headers="mcps1.2.3.1.1 "><p id="p15190162616316"><a name="p15190162616316"></a><a name="p15190162616316"></a>负数</p>
</td>
<td class="cellrowborder" valign="top" width="50.019999999999996%" headers="mcps1.2.3.1.2 "><p id="p131906262311"><a name="p131906262311"></a><a name="p131906262311"></a>UART设置传输模式失败</p>
</td>
</tr>
</tbody>
</table>
假设需要设置的UART传输模式为UART\_MODE\_RD\_BLOCK，设置传输模式的实例如下：
| 参数 | 参数描述 |
| -------- | -------- |
| handle | UART设备句柄 |
| mode | 待设置的传输模式， |
| **返回值** | **返回值描述** |
| 0 | UART设置传输模式成功 |
| 负数 | UART设置传输模式失败 |
假设需要设置的UART传输模式为UART\_MODE\_RD\_BLOCK，示例代码如下：
```
int32_t ret;
......@@ -460,47 +231,16 @@ int32\_t UartWrite\(DevHandle handle, uint8\_t \*data, uint32\_t size\);
**表 8** UartWrite参数和返回值描述
<a name="table27825111368"></a>
<table><thead align="left"><tr id="row1578171123619"><th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.1"><p id="p078112115360"><a name="p078112115360"></a><a name="p078112115360"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.2"><p id="p37811711163612"><a name="p37811711163612"></a><a name="p37811711163612"></a>参数描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row1878291143611"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p07818112360"><a name="p07818112360"></a><a name="p07818112360"></a>handle</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p178281113369"><a name="p178281113369"></a><a name="p178281113369"></a>UART设备句柄</p>
</td>
</tr>
<tr id="row7782811123614"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p8782911173610"><a name="p8782911173610"></a><a name="p8782911173610"></a>data</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p17782171120366"><a name="p17782171120366"></a><a name="p17782171120366"></a>待写入数据的指针</p>
</td>
</tr>
<tr id="row1578251112367"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p3782911183612"><a name="p3782911183612"></a><a name="p3782911183612"></a>size</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p17782161110366"><a name="p17782161110366"></a><a name="p17782161110366"></a>待写入数据的长度</p>
</td>
</tr>
<tr id="row1378281113363"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p87821411183616"><a name="p87821411183616"></a><a name="p87821411183616"></a><strong id="b157825113363"><a name="b157825113363"></a><a name="b157825113363"></a>返回值</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p13782111116361"><a name="p13782111116361"></a><a name="p13782111116361"></a><strong id="b978211113366"><a name="b978211113366"></a><a name="b978211113366"></a>返回值描述</strong></p>
</td>
</tr>
<tr id="row47822112365"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p107821011103613"><a name="p107821011103613"></a><a name="p107821011103613"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p11782191103610"><a name="p11782191103610"></a><a name="p11782191103610"></a>UART写数据成功</p>
</td>
</tr>
<tr id="row11782911113611"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p1578221111367"><a name="p1578221111367"></a><a name="p1578221111367"></a>负数</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p9782151110366"><a name="p9782151110366"></a><a name="p9782151110366"></a>UART写数据失败</p>
</td>
</tr>
</tbody>
</table>
写入指定长度数据的实例如下：
| 参数 | 参数描述 |
| -------- | -------- |
| handle | UART设备句柄 |
| data | 待写入数据的指针 |
| size | 待写入数据的长度 |
| **返回值** | **返回值描述** |
| 0 | UART写数据成功 |
| 负数 | UART写数据失败 |
写入指定长度数据的示例代码如下：
```
int32_t ret;
......@@ -520,47 +260,16 @@ int32\_t UartRead\(DevHandle handle, uint8\_t \*data, uint32\_t size\);
**表 9** UartRead参数和返回值描述
<a name="table162341717123713"></a>
<table><thead align="left"><tr id="row023313171377"><th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.1"><p id="p1123331710376"><a name="p1123331710376"></a><a name="p1123331710376"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.2"><p id="p523321783715"><a name="p523321783715"></a><a name="p523321783715"></a>参数描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row6234417133712"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p7233121716379"><a name="p7233121716379"></a><a name="p7233121716379"></a>handle</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p17234101753712"><a name="p17234101753712"></a><a name="p17234101753712"></a>UART设备句柄</p>
</td>
</tr>
<tr id="row18234151718372"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p16234191783711"><a name="p16234191783711"></a><a name="p16234191783711"></a>data</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p923417175378"><a name="p923417175378"></a><a name="p923417175378"></a>接收读取数据的指针</p>
</td>
</tr>
<tr id="row82341017193711"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p13234917103717"><a name="p13234917103717"></a><a name="p13234917103717"></a>size</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p182341817153717"><a name="p182341817153717"></a><a name="p182341817153717"></a>待读取数据的长度</p>
</td>
</tr>
<tr id="row102341617123717"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p172341617163712"><a name="p172341617163712"></a><a name="p172341617163712"></a><strong id="b1323411179373"><a name="b1323411179373"></a><a name="b1323411179373"></a>返回值</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p1623431763718"><a name="p1623431763718"></a><a name="p1623431763718"></a><strong id="b1123411173377"><a name="b1123411173377"></a><a name="b1123411173377"></a>返回值描述</strong></p>
</td>
</tr>
<tr id="row4234151719372"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p3234131716375"><a name="p3234131716375"></a><a name="p3234131716375"></a>非负数</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p7234171783718"><a name="p7234171783718"></a><a name="p7234171783718"></a>UART读取到的数据长度</p>
</td>
</tr>
<tr id="row112340173378"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p1423431743714"><a name="p1423431743714"></a><a name="p1423431743714"></a>负数</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p32349178378"><a name="p32349178378"></a><a name="p32349178378"></a>UART读取数据失败</p>
</td>
</tr>
</tbody>
</table>
读取指定长度数据的实例如下：
| 参数 | 参数描述 |
| -------- | -------- |
| handle | UART设备句柄 |
| data | 接收读取数据的指针 |
| size | 待读取数据的长度 |
| **返回值** | **返回值描述** |
| 非负数 | UART读取到的数据长度 |
| 负数 | UART读取数据失败 |
读取指定长度数据的示例代码如下：
```
int32_t ret;
......@@ -585,22 +294,11 @@ void UartClose\(DevHandle handle\);
**表 10** UartClose参数和返回值描述
<a name="table03348317351"></a>
<table><thead align="left"><tr id="row15334837351"><th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.1"><p id="p933411316354"><a name="p933411316354"></a><a name="p933411316354"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.2.3.1.2"><p id="p16334103143517"><a name="p16334103143517"></a><a name="p16334103143517"></a>参数描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row733483103513"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.1 "><p id="p7334530358"><a name="p7334530358"></a><a name="p7334530358"></a>handle</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.3.1.2 "><p id="p133341331356"><a name="p133341331356"></a><a name="p133341331356"></a>UART设备句柄</p>
</td>
</tr>
</tbody>
</table>
销毁UART设备句柄的实例如下：
| 参数 | 参数描述 |
| -------- | -------- |
| handle | UART设备句柄 |
销毁UART设备句柄的示例代码如下：
```
UartClose(handle); /* 销毁UART设备句柄 *
......
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