RT-Thread-【Nuvoton M487试用】GPIO+UART测评RT-Thread问答社区

【Nuvoton M487试用】GPIO+UART测评

发布于 2022-04-24 16:39:52 浏览：771 订阅该版

时间：2022.4.24
作者：liqiucen
**1.测试环境**
RT-Thread Studio 2.2.3

**2.测试任务**
本次任务为基于RT-Thread Studio开发环境对新唐 Nuvoton M487 GPIO和UART测试

**3.GPIO**
**3.1.资源介绍**

电路板原理图如下，PH0、PH1、PH2分别输出红、黄、绿三色LED
![image.png](https://oss-club.rt-thread.org/uploads/20220424/f0c605fe15ebabe758195f36dc175f09.png)
![image.png](https://oss-club.rt-thread.org/uploads/20220424/8fd29b121f834fcd74d8b7070aefd31a.png)

**3.2.程序源码**
项目工程建立参见[RT-Thread快速开始](https://www.rt-thread.org/document/site/#/development-tools/rtthread-studio/um/studio-user-begin)
工程模板选择基于开发板的NUMAKER-IOT-M487。
![image.png](https://oss-club.rt-thread.org/uploads/20220424/a07b78c71a8a7d8683d70254fbbecbc5.png)

引脚定义
```
#define LEDR   NU_GET_PININDEX(NU_PH, 0)
#define LEDY   NU_GET_PININDEX(NU_PH, 1)
#define LEDG   NU_GET_PININDEX(NU_PH, 2)
```
配置为输出模式
```
rt_pin_mode(LEDR, PIN_MODE_OUTPUT);
rt_pin_mode(LEDG, PIN_MODE_OUTPUT);
rt_pin_mode(LEDY, PIN_MODE_OUTPUT);
```
流水灯输出
```
rt_pin_write(LEDR, PIN_LOW);
rt_pin_write(LEDY, PIN_HIGH);
rt_pin_write(LEDG, PIN_HIGH);
rt_thread_mdelay(500);
rt_pin_write(LEDR, PIN_HIGH);
rt_pin_write(LEDY, PIN_LOW);
rt_pin_write(LEDG, PIN_HIGH);
rt_thread_mdelay(500);
rt_pin_write(LEDR, PIN_HIGH);
rt_pin_write(LEDY, PIN_HIGH);
rt_pin_write(LEDG, PIN_LOW);
rt_thread_mdelay(500);

```

**4.UART**
**4.1.资源介绍**
PD.0和PD.1分别做UART3_RXD和UART3_TXD，正好开发板有引出
![image.png](https://oss-club.rt-thread.org/uploads/20220424/a263699c25db668450de2937a869726b.png.webp)
![image.png](https://oss-club.rt-thread.org/uploads/20220424/8cbbabd97c67a9ea84ee9a92951d3cac.png)

**4.2.程序源码**
打开RT-Thread Settings,使能UART3，可以看到rtconfig.h已经添加了#define BSP_USING_UART3
![image.png](https://oss-club.rt-thread.org/uploads/20220424/cef69bfb7f3335d645595de8f13e3462.png)

将PD0、PD1引脚复用为UART3_RXD，UART3_TXD
```
SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD1MFP_Msk | SYS_GPD_MFPL_PD0MFP_Msk);
SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD0MFP_UART3_RXD | SYS_GPD_MFPL_PD1MFP_UART3_TXD);
```

初始化UART3
```
char str[]="hello rt-thread\r\n";
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;  /* 初始化配置参数 */
serial = rt_device_find("uart3");
config.baud_rate = 921600;               //修改波特率为 921600
config.data_bits = DATA_BITS_8;           //数据位 8
config.stop_bits = STOP_BITS_1;           //停止位 1
config.bufsz     = 128;                   //修改缓冲区 buff size 为 128
config.parity    = PARITY_NONE;           //无奇偶校验位
rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);
rt_device_set_rx_indicate(serial, uart_input);
rt_device_open(serial, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
```

主循环添加发送hello rt-thread
```
    while (1)
    {
        rt_pin_write(LEDR, PIN_LOW);
        rt_pin_write(LEDY, PIN_HIGH);
        rt_pin_write(LEDG, PIN_HIGH);
        rt_thread_mdelay(500);
        rt_pin_write(LEDR, PIN_HIGH);
        rt_pin_write(LEDY, PIN_LOW);
        rt_pin_write(LEDG, PIN_HIGH);
        rt_thread_mdelay(500);
        rt_pin_write(LEDR, PIN_HIGH);
        rt_pin_write(LEDY, PIN_HIGH);
        rt_pin_write(LEDG, PIN_LOW);
        rt_thread_mdelay(500);

rt_device_write(serial, 0, &str, 20);
    }
```

接收中断中将接收数据发送出去
```
rt_err_t uart_input(rt_device_t dev, rt_size_t size)
{
    char re_buffer;
    rt_device_read(serial, -1, &re_buffer, 1);
    rt_device_write(serial, 0, &re_buffer, 1);
}
```

**5.调试下载**
编译后使用nu-link下载程序
使用USB转TTL连接开发板，串口定时接收到hello rt-thread
![image.png](https://oss-club.rt-thread.org/uploads/20220424/628325794e8e63b26813fb54ceda4123.png.webp)
[演示视频.mp4](https://oss-club.rt-thread.org/uploads/20220424/21c1064a544ea05488608b745ff037a0.mp4)