#2020征文开发板 Hi3861GPIO操作 点灯和按键实验操作

在大概了解鸿蒙系统后和学习完编译环境搭建，于是我做了一个小小的实验，利用Hi3861GPIO操作完成点灯和按键实验

先看最简单得LED灯闪烁操作

源码结构如下：

Hello world.c文件内容：

#include <stdio.h>
#include <unistd.h>
#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"
#include "wifiiot_pwm.h"

static WifiIotIoName LightGPIO[] = 
{
    WIFI_IOT_IO_NAME_GPIO_10,
    WIFI_IOT_IO_NAME_GPIO_11,
    WIFI_IOT_IO_NAME_GPIO_12
};

static int volatile BtnPressed = 0;
static void OnButtonPressed(char* arg);
static void OnButtonReleased(char* arg);

static void OnButtonPressed(char* arg)
{
    (void)arg;

    printf("[HelloWorld] OnButtonPressed()\n");

    BtnPressed = 1;

    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_8,
                        WIFI_IOT_INT_TYPE_EDGE, 
                        WIFI_IOT_GPIO_EDGE_RISE_LEVEL_HIGH,
                        OnButtonReleased, NULL);
                        
}

static void OnButtonReleased(char* arg)
{
    (void)arg;

    printf("[HelloWorld] OnButtonReleased()\n");

    BtnPressed = 0;

    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_8,
                        WIFI_IOT_INT_TYPE_EDGE, 
                        WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW,
                        OnButtonPressed, NULL);
}

static void* HelloWorld_Task(const char* arg)
{
    int i = 0;

    printf("[HelloWorld] HelloWorld_Task()\n");

    (void)arg;

    GpioInit();

    for(i=0; i<3; i++)
    {
        //复用引脚为 GPIO
        IoSetFunc(LightGPIO[i], 0);
        //设置为输出
        GpioSetDir(LightGPIO[i], WIFI_IOT_GPIO_DIR_OUT);
    }

    //复用引脚为 GPIO
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_8, WIFI_IOT_IO_FUNC_GPIO_8_GPIO);
    //设置为输入
    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_8, WIFI_IOT_GPIO_DIR_IN);
    IoSetPull(WIFI_IOT_IO_NAME_GPIO_8, WIFI_IOT_IO_PULL_UP);
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_8,
                        WIFI_IOT_INT_TYPE_EDGE, 
                        WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW,
                        OnButtonPressed, NULL);

    //复用引脚为 GPIO
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_IO_FUNC_GPIO_9_PWM0_OUT);
    //设置为输入
    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_GPIO_DIR_OUT);
    PwmInit(WIFI_IOT_PWM_PORT_PWM0);

    while(1) 
    {
        int j = 0;

        while( j < 3 )
        {
            GpioSetOutputVal(LightGPIO[j++], 0);
        }

        i = (i + 1) % 3;

        GpioSetOutputVal(LightGPIO[i], 1);
        
        usleep(500000);

        if( BtnPressed ) 
            PwmStart(WIFI_IOT_PWM_PORT_PWM0, 5 * 1000, 40 * 1000);
        else
            PwmStop(WIFI_IOT_PWM_PORT_PWM0);
    }

    return NULL;
}

static void HelloWorld_Entry(void)
{
    osThreadAttr_t attr = {0};

    printf("[HelloWorld] HelloWorld_Entry()\n");

    attr.name = "HelloWorld_Task";
    attr.attr_bits = 0U;
    attr.cb_mem = NULL;
    attr.cb_size = 0U;
    attr.stack_mem = NULL;
    attr.stack_size = 1024;
    attr.priority = osPriorityNormal;

    if (osThreadNew((osThreadFunc_t)HelloWorld_Task, NULL, &attr) == NULL)
    {
        printf("[HelloWorld] Falied to create LedTask!\n");
    }
}

SYS_RUN(HelloWorld_Entry);

获取源码包

作者：wx5fb05cef6ec2d
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