一、准备工作
二、编译代码
三、测试

5.UART数据传输测试

该教程演示如何通过开发板的UART数据传输测试

一、准备工作

准备1块BearPi-Pico H3863开发板

二、编译代码

在Windows下编译操作

点击工具栏中的“系统配置”,打开配置界面.

选择Support UART Sample

Application  --->
    [*] Enable Sample.
    [*]     Enable the Sample of peripheral.
    [ ]         Enable all the sample of peripheral, it's just for build.
    [ ]         Support ADC Sample.
    [ ]         Support BLINKY Sample.
    [ ]         Support BUTTON Sample.
    [ ]         Support I2C Sample.
    [ ]         Support PINCTRL Sample.
    [ ]         Support PWM Sample.
    [ ]         Support SPI Sample.
    [ ]         Support SYSTICK Sample.
    [ ]         Support TASKS Test Sample.
    [ ]         Support TCXO Sample.
    [ ]         Support TIMER Sample.
    [*]         Support UART Sample.
                    UART Sample Configuration  --->

设置UART对应的id和GPIO,id设置为1，GPIO设置为15和16。

UART Sample Configuration  --->
    (1) Choose UART bus id.
    (15) Choose UART TXD pin.
    (16) Choose UART RXD pin.
    [*] Choose UART poll transfer mode.
    [ ] Choose UART interrupt transfer mode.

按下"Save"键保存配置。

关键代码，位于application\samples\peripheral\uart\uart_demo.c

static void *uart_task(const char *arg)
{
    unused(arg);
    /* UART pinmux. */
    app_uart_init_pin();        //设置引脚复用

    /* UART init config. */
    app_uart_init_config();     //初始化uart

    ......

    while (1) {
        osal_msleep(UART_TASK_DURATION_MS);
#if defined(CONFIG_UART_POLL_TRANSFER_MODE)
        osal_printk("uart%d poll mode send start!, len = %d\r\n", CONFIG_UART_BUS_ID, sizeof(g_app_uart_rx_buff));
        (void)uapi_watchdog_kick();
        if (uapi_uart_write(CONFIG_UART_BUS_ID, g_app_uart_tx_buff, UART_TRANSFER_SIZE, 0) == UART_TRANSFER_SIZE) {     //发送uart数据
            osal_printk("uart%d poll mode send back succ!\r\n", CONFIG_UART_BUS_ID);
        }
        if (uapi_uart_read(CONFIG_UART_BUS_ID, g_app_uart_rx_buff, UART_TRANSFER_SIZE, 0) > 0) {                        //接收uart数据
            osal_printk("uart%d poll mode receive succ!, g_app_uart_rx_buff = %s\r\n", CONFIG_UART_BUS_ID,
                        g_app_uart_rx_buff);
        }

#endif
    ......
    }

    return NULL;
}

编译烧录固件
参考环境搭建教程编译烧录代码

在Ubuntu下编译操作

在MobaXterm中输入:
```
./build.py menuconfig ws63-liteos-app
```

选择Support UART Sample

Application  --->
    [*] Enable Sample.
    [*]     Enable the Sample of peripheral.
    [ ]         Enable all the sample of peripheral, it's just for build.
    [ ]         Support ADC Sample.
    [ ]         Support BLINKY Sample.
    [ ]         Support BUTTON Sample.
    [ ]         Support I2C Sample.
    [ ]         Support PINCTRL Sample.
    [ ]         Support PWM Sample.
    [ ]         Support SPI Sample.
    [ ]         Support SYSTICK Sample.
    [ ]         Support TASKS Test Sample.
    [ ]         Support TCXO Sample.
    [ ]         Support TIMER Sample.
    [*]         Support UART Sample.
                    UART Sample Configuration  --->

设置UART对应的id和GPIO,id设置为1，GPIO设置为15和16。

UART Sample Configuration  --->
    (1) Choose UART bus id.
    (15) Choose UART TXD pin.
    (16) Choose UART RXD pin.
    [*] Choose UART poll transfer mode.
    [ ] Choose UART interrupt transfer mode.

按下"ESC"键退出并保存配置。

关键代码，位于application\samples\peripheral\uart\uart_demo.c

static void *uart_task(const char *arg)
{
    unused(arg);
    /* UART pinmux. */
    app_uart_init_pin();        //设置引脚复用

    /* UART init config. */
    app_uart_init_config();     //初始化uart

    ......

    while (1) {
        osal_msleep(UART_TASK_DURATION_MS);
#if defined(CONFIG_UART_POLL_TRANSFER_MODE)
        osal_printk("uart%d poll mode send start!, len = %d\r\n", CONFIG_UART_BUS_ID, sizeof(g_app_uart_rx_buff));
        (void)uapi_watchdog_kick();
        if (uapi_uart_write(CONFIG_UART_BUS_ID, g_app_uart_tx_buff, UART_TRANSFER_SIZE, 0) == UART_TRANSFER_SIZE) {     //发送uart数据
            osal_printk("uart%d poll mode send back succ!\r\n", CONFIG_UART_BUS_ID);
        }
        if (uapi_uart_read(CONFIG_UART_BUS_ID, g_app_uart_rx_buff, UART_TRANSFER_SIZE, 0) > 0) {                        //接收uart数据
            osal_printk("uart%d poll mode receive succ!, g_app_uart_rx_buff = %s\r\n", CONFIG_UART_BUS_ID,
                        g_app_uart_rx_buff);
        }

#endif
    ......
    }

    return NULL;
}

编译烧录固件
参考环境搭建教程编译烧录代码

三、测试

烧录固件后按下开发的复位按键，用杜邦线短接RXD和TXD引脚，观察串口消息打印。


uart1 poll mode send start!, len = 18
uart1 poll mode send back succ!
uart1 poll mode receive succ!, g_app_uart_rx_buff = Hello BearPi
uart1 poll mode send start!, len = 18
uart1 poll mode send back succ!
uart1 poll mode receive succ!, g_app_uart_rx_buff = Hello BearPi
uart1 poll mode send start!, len = 18
uart1 poll mode send back succ!
uart1 poll mode receive succ!, g_app_uart_rx_buff = Hello BearPi