Hi3861 通过UART串口协议与其它开发板进行通信

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一、搭建编译环境

1、下载虚拟机VMware和Ubuntu20.0.14

下载 VMware Workstation Pro | CN

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SConspython3 -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