Hi3861 通过UART串口协议与其它开发板进行通信

一、搭建编译环境

1、下载虚拟机VMware和Ubuntu20.0.14

下载 VMware Workstation Pro | CN

https://www.vmware.com/cn/products/workstation-pro/workstation-pro-evaluation.html

Ubuntu系统下载 | Ubuntu

https://cn.ubuntu.com/download

2、 安装vm完成后打开vm,点击创建新的虚拟机

 

 

3、选择典型点击下一步,选择下载的Ubuntu,点击下一步,创建完成后虚拟机自动安装Ubuntu

 

 

4、安装完成后获取OpenHarmony源码可参考

https://docs.openharmony.cn/pages/v3.1/zh-cn/device-dev/get-code/sourcecode-acquire.md/

5、安装编译工具

(1)安装Node.js打开Ubuntu终端输入命令安装:

 

sudo apt-get install nodejs
sudo apt-get install npm
node --version   //查看nodejs版本
npm --version    //查看npm版本
 

  

(2)安装Python编译环境

 

sudo apt-get install python3.8
sudo apt-get install python3-pip
sudo pip3 install setuptools
sudo pip3 install kconfiglib 
sudo pip3 install pycryptodome
sudo pip3 install six --upgrade --ignore-installed six
sudo pip3 install ecdsa
 

  

(3) 安装SCons

 

python3 -m pip install scons
scons -v   //查看版本
 

  

如图:

 

 

(4)安装hb工具代码测试

 

python3 -m pip install --user ohos-build
vim ~/.bashrc                      //设置环境变量
export PATH=~/.local/bin:$PATH        //将以下命令拷贝到.bashrc文件的最后一行,保存并退出
source ~/.bashrc            //更新环境变量
 

  

执行"hb -h",有打印以下信息即表示安装成功。

 

 

(5) 安装gcc_riscv32

下载gcc_riscv32镜像

https://gitee.com/link?target=https%3A%2F%2Frepo.huaweicloud.com%2Fharmonyos%2Fcompiler%2Fgcc_riscv32%2F7.3.0%2Flinux%2Fgcc_riscv32-linux-7.3.0.tar.gz

设置环境变量

将压缩包解压到根目录

 

tar -xvf gcc_riscv32-linux-7.3.0.tar.gz -C ~    //文件名需要与下载的文件相匹配
设置环境变量。
vim ~/.bashrc                      //设置环境变量
export PATH=~/gcc_riscv32/bin:$PATH    //将以下命令拷贝到.bashrc文件的最后一行,保存并退出
source ~/.bashrc            //更新环境变量
riscv32-unknown-elf-gcc -v        //显示版本号,则安装成功
 

  

6、修改usr_config.mk文件

文件在OpenHarmony源码目录下

device/hisilicon/hispark_pegasus/sdk_liteos/build/config/usr_config.mk

 

CONFIG_I2C_SUPPORT=y
CONFIG_PWM_SUPPORT=y
 

  

7、修改wifiservice文件夹

文件在OpenHarmony源码目录下

device/hisilicon/hispark_pegasus/hi3861_adapter/hals/communication/wifi_lite/wifiservice/source/wifi_hotspot.c

 

EnableHotspot函数中屏蔽如下字段
     //if (SetHotspotIpConfig() != WIFI_SUCCESS) {
     //    return ERROR_WIFI_UNKNOWN;
     //}
地址:device/hisilicon/hispark_pegasus/hi3861_adapter/hals/communication/wifi_lite/wifiservice/source/wifi_device.c
DispatchConnectEvent函数下 屏蔽StaSetWifiNetConfig相关代码行
      //StaSetWifiNetConfig(HI_WIFI_EVT_CONNECTED);
      //StaSetWifiNetConfig(HI_WIFI_EVT_DISCONNECTED);
 

 

二、创建项目文件夹

1、在OpenHarmony1.01版本创建一个项目demo

在源码目录下的vendor/team_x创建smart_demo

在scr里面添加我们写的代码:

 

 

2、初始化uart串口

首先我们需要创建一个初始化uart串口的程序

将GPIO0初始化为tx端,将GPIO1初始化为rx端

 

void UartInit(void){
    RaiseLog(LOG_LEVEL_INFO,"[2022012x01] entry into UartInit");
    IoTGpioInit(HAL_WIFI_IOT_IO_NAME_GPIO_0);
    HalIoSetFunc(HAL_WIFI_IOT_IO_NAME_GPIO_0, WIFI_IOT_IO_FUNC_GPIO_0_UART1_TXD);
    IoTGpioInit(HAL_WIFI_IOT_IO_NAME_GPIO_1);
    HalIoSetFunc(HAL_WIFI_IOT_IO_NAME_GPIO_1, WIFI_IOT_IO_FUNC_GPIO_1_UART1_RXD); 
    hi_uart_attribute uart_attr = {
        .baud_rate = UART_BAUD_RATE,     /* baud_rate: 9600 */
        .data_bits = UART_DATA_BITS,      /* data_bits: 8bits */
        .stop_bits = UART_STOP_BITS,
        .parity = 0,
    }
    RaiseLog(LOG_LEVEL_INFO,"[2022012x01] uart_init success");
    /* Initialize uart driver */
    hi_u32 ret = hi_uart_init(HI_UART_IDX_1, &uart_attr, HI_NULL);
    if (ret != HI_ERR_SUCCESS)
    {
        printf("[Dustbin_tes3]Failed to init uart! Err code = %d\n", ret);
        return;
    }
}
 

  

3、创建线程任务

 

static void *uart_demo_task(void)
{
    static uint16_t countSendTimes = 0;
    static uint8_t countReceiveTimes = 0;
    uartController.isReadBusy = false;
    printf("[Initialize uart successfully\n");
    UartInit();
    while (1)
    {
        osDelay(50); 
        UartReceiveMessage();//Collecting Serial Port Data
        hi_sleep(SMART_BIN_SLEEP_2500MS);  
    }
    return 0;
}
static void IotMainEntry(void)
{
    osThreadAttr_t attr;
    RaiseLog(LOG_LEVEL_INFO, "DATA:%s Time:%s \r\n", __FUNCTION__, __DATE__, __TIME__);

    // Create the IoT Main task
    attr.attr_bits = 0U;
    attr.cb_mem = NULL;
    attr.cb_size = 0U;
    attr.stack_mem = NULL
    attr.stack_size = CONFIG_TASK_MAIN_STACKSIZE;
    attr.priority = CONFIG_TASK_MAIN_PRIOR;
    attr.name = "IoTMain";
    (void) osThreadNew((osThreadFunc_t)uart_demo_task, NULL, (const osThreadAttr_t *)&attr);
    return;
}
APP_FEATURE_INIT(IotMainEntry);
 

  

4、接收串口数据

 

static void UartReceiveMessage(void)
{
    char *recData;
    printf("----Listening----\n");
    RaiseLog(LOG_LEVEL_INFO,"Start Listening serial port");
    if (UartIsBufEmpty())
        {
            return;
        }
        if (uartController.isReadBusy)
        {
            return;
        }
        uartController.isReadBusy = true;
        g_ReceivedDatalen = hi_uart_read(UART_NUM, g_uart_buff, UART_BUFF_SIZE);
        if (g_ReceivedDatalen > 0)
        {
            printf("handleUartReceiveMessage rcvData len:%d,msg:%s.\n", g_ReceivedDatalen, g_uart_buff);     
            setVoiceCommand();//Setting voice Commands
            memset(g_uart_buff, 0, sizeof(g_uart_buff));
            g_ReceivedDatalen = 0;
        }
        uartController.isReadBusy = false;
}
 

  

当hi3861开发板接收到其他开发板传输的数据后,可以通过串口打印出来,对此可以写一个解析命令,对发送的字符串,执行相应的命令

 

 

注:在接线时,要将tx与另一个开发板的rx连接,因为在UART串口协议中,通过TX(发送引脚)和RX(接收引脚)进行数据传输与接收,需要将TX发送引脚与另一开发板的RX接收引脚相连接,故需要交叉连接以保证两块开发板的正常通信。

 

 

 

 

posted on 2022-09-09 11:05  OpenHarmony开发者  阅读(197)  评论(0编辑  收藏  举报