# HiSpark WiFi-IoT 鸿蒙套件样例开发--UART
[HiSpark WiFi-IoT鸿蒙开发套件](https://item.taobao.com/item.htm?id=622343426064&scene=taobao_shop) 首发于HDC 2020，是首批支持HarmonyOS 2.0的开发套件，亦是鸿蒙官方推荐套件，由润和软件HiHope量身打造，已在鸿蒙社区和广大鸿蒙开发者中得到广泛应用。
## 一、UART API
使用下面的API实现UART读写
#### 鸿蒙UART相关的API接口文件路径
**base/iot_hardware/interfaces/kits/wifiiot_lite/wifiiot_uart.h**
所使用的API接口有：
| API | 接口说明 |
| ------------------------------------------------------------ | ------------------------ |
| unsigned int UartInit(WifiIotUartIdx id, const WifiIotUartAttribute *param, const WifiIotUartExtraAttr *extraAttr); | 初始化，配置一个UART设备 |
| int UartRead(WifiIotUartIdx id, unsigned char *data, unsigned int dataLen) | 从UART设备中读取数据 |
| int UartWrite(WifiIotUartIdx id, const unsigned char *data, unsigned int dataLen) | 将数据写入UART设备 |
####
## 二、代码分析
首先需要使能UART2
vendor\hisi\hi3861\hi3861\build\config\usr_config.mk
配置CONFIG_UART2_SUPPORT=y
或者调用GPIO相关的API将串口所在的GPIO口设置为UART功能
```c
static void* UartDemo_Task(const char* arg)
{
unsigned int len = 0;
(void)arg;
printf("[UartDemo] UartDemo_Task()\n");
GpioInit();//使用GPIO，都需要调用该接口
printf("UART init...\r\n");
//UART参数配置
usr_uart_config();
UartWrite(WIFI_IOT_UART_IDX_2, (unsigned char *)uartWriteBuff, sizeof(uartWriteBuff));
while(1)
{
//读取UART2的数据
len = UartRead(WIFI_IOT_UART_IDX_2, uartReadBuff, sizeof(uartReadBuff));
if (len > 0) {
printf("Uart read data:%s", uartReadBuff);
}
usleep(100000);
}
return NULL;
}
```
## 三、如何编译
1. 将此目录下的 `uart_demo.c` 和 `BUILD.gn` 复制到openharmony源码的`applications\sample\wifi-iot\app\iothardware`目录下，
2. 修改openharmony源码的`applications\sample\wifi-iot\app\BUILD.gn`文件，将其中的 `features` 改为：
```
features = [
"iothardware:uart_demo",
]
```
3.在openharmony源码顶层目录执行：`python build.py wifiiot`
## 四、运行结果
```
##### 串口0
RX：ready to OS start
sdk ver:Hi3861V100R001C00SPC025 2020-09-03 18:10:00
FileSystem mount ok.
wifi init success!
[UartDemo] UartDemo_Entry()
[UartDemo] UartDemo_Task()
UART init...
00 00:00:00 0 132 D 0/HIVIEW: hilog init success.
00 00:00:00 0 132 D 0/HIVIEW: log limit init success.
00 00:00:00 0 132 I 1/SAMGR: Bootstrap core services(count:3).
00 00:00:00 0 132 I 1/SAMGR: Init service:0x4ae958 TaskPool:0xe5238
00 00:00:00 0 132 I 1/SAMGR: Init service:0x4ae964 TaskPool:0xe5258
00 00:00:00 0 132 I 1/SAMGR: Init service:0x4aea8c TaskPool:0xe5278
00 00:00:00 0 8 I 1/SAMGR: Init service 0x4ae964 <time: 0ms> success!
00 00:00:00 0 164 I 1/SAMGR: Init service 0x4ae958 <time: 0ms> success!
00 00:00:00 0 108 D 0/HIVIEW: hiview init success.
00 00:00:00 0 108 I 1/SAMGR: Init service 0x4aea8c <time: 10ms> success!
00 00:00:00 0 108 I 1/SAMGR: Initialized all core system services!
00 00:00:00 0 164 I 1/SAMGR: Bootstrap system and application services(count:0).
00 00:00:00 0 164 I 1/SAMGR: Initialized all system and application services!
00 00:00:00 0 164 I 1/SAMGR: Bootstrap dynamic registered services(count:0).
RX：Uart read data:hello
RX：Uart read data:12345678
##### 串口2
RX：hello uart!
TX：hello
TX：12345678
```
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2023-05-18
00:17:42
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物联网润和华为Hi3861相关资源 （947个子文件） 
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