HarmonyOS驱动子程序开发

GPIO

接口简介

wifiiot_gpio.h接口简介
这个.h中包含声明GPIO接口函数，这些功能用于初始化GPIO

接口名功能描述
unsigned int GpioInit(void)初始化GPIO
unsigned int GpioDeinit(void)取消初始化GPIO
unsigned int GpioSetDir(WifiIotGpioIdx id, WifiIotGpioDir dir)设置GPIO引脚方向
unsigned int GpioGetDir(WifiIotGpioIdx id, WifiIotGpioDir *dir)获取GPIO引脚方向
unsigned int GpioSetOutputVal(WifiIotGpioIdx id, WifiIotGpioValue val)设置GPIO引脚输出电平值
unsigned int GpioGetOutputVal(WifiIotGpioIdx id, WifiIotGpioValue *val)获取GPIO引脚输出电平值

wifiiot_gpio_ex.h接口简介
这个.h中包含声明拓展的GPIO接口函数，这些功能用于设置GPIO拉力和驱动器强度

接口名功能描述
unsigned int IoSetPull(WifiIotIoName id, WifiIotIoPull val)设置GPIO引脚上拉
unsigned int IoGetPull(WifiIotIoName id, WifiIotIoPull *val)获取GPIO引脚上拉
unsigned int IoSetFunc(WifiIotIoName id, unsigned char val)设置GPIO引脚功能
unsigned int IoGetFunc(WifiIotIoName id, unsigned char *val)获取GPIO引脚功能
unsigned int IOSetDriverStrength(WifiIotIoName id, WifiIotIoDriverStrength val)设置GPIO驱动能力
unsigned int IOGetDriverStrength(WifiIotIoName id, WifiIotIoDriverStrength *val)获取GPIO驱动能力

查看LED对应的GPIO引脚

LED对应的GPIO引脚是GPIO2通过控制GPIO2输出的电平信号来实现LED灯闪烁。
高电平时点亮LED灯；低电平熄灭LED灯
在这里插入图片描述
在这里插入图片描述

操作GPIO点亮LED

#include <stdio.h>
#include <unistd.h>
#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"
static void LedTask(void)
{
    //初始化GPIO
    GpioInit();
    //设置GPIO_2的复用功能为普通GPIO
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_2, WIFI_IOT_IO_FUNC_GPIO_2_GPIO);
    //设置GPIO_2为输出模式
    GpioSetDir(WIFI_IOT_GPIO_IDX_2, WIFI_IOT_GPIO_DIR_OUT);
    while (1)
    {
        //设置GPIO_2输出高电平点亮LED灯
        GpioSetOutputVal(WIFI_IOT_GPIO_IDX_2, 1);
        //延时1s
        usleep(1000000);
        //设置GPIO_2输出低电平熄灭LED灯
        GpioSetOutputVal(WIFI_IOT_GPIO_IDX_2, 0);
        //延时1s
        usleep(1000000);
    }
}
static void LedExampleEntry(void)
{
    osThreadAttr_t attr;
    attr.name = "LedTask";
    attr.attr_bits = 0U;
    attr.cb_mem = NULL;
    attr.cb_size = 0U;
    attr.stack_mem = NULL;
    attr.stack_size = 512;
    attr.priority = 25;
    if (osThreadNew((osThreadFunc_t)LedTask, NULL, &attr) == NULL)
    {
        printf("Falied to create LedTask!\n");
    }
}
APP_FEATURE_INIT(LedExampleEntry);

烧录并查看
重启可以看到LED灯开始闪烁

GPIO扩展实验

#include <stdio.h>
#include <unistd.h>

#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"

static void LedTask(void)
{
    osDelay(100);
    //初始化GPIO
    GpioInit();

    //设置GPIO_2的复用功能为普通GPIO
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_2, WIFI_IOT_IO_FUNC_GPIO_2_GPIO);

    //设置GPIO_2为输出模式
    GpioSetDir(WIFI_IOT_GPIO_IDX_2, WIFI_IOT_GPIO_DIR_OUT);
    //定义变量存储方向
    WifiIotGpioDir val={0};
    //获取方向
    GpioGetDir(WIFI_IOT_GPIO_IDX_2,&val);
    printf("GPIO_2 Dir is %d\r\n",val);
    //定义变量存储电平值
    WifiIotGpioValue OutputVal={0};

    while (1)
    {
        //设置GPIO_2输出高电平点亮LED灯
        GpioSetOutputVal(WIFI_IOT_GPIO_IDX_2, 1);
        //获取电平值
        GpioGetOutputVal(WIFI_IOT_GPIO_IDX_2,&OutputVal);
        printf("GPIO_2 OutputVal is %d\r\n",OutputVal);

        //延时1s
        usleep(1000000);

        //设置GPIO_2输出低电平熄灭LED灯
        GpioSetOutputVal(WIFI_IOT_GPIO_IDX_2, 0);
        GpioGetOutputVal(WIFI_IOT_GPIO_IDX_2,&OutputVal);
        printf("GPIO_2 OutputVal is %d\r\n",OutputVal);

        //延时1s
        usleep(1000000);
    }
}

static void LedExampleEntry(void)
{
    osThreadAttr_t attr;

    attr.name = "LedTask";
    attr.attr_bits = 0U;
    attr.cb_mem = NULL;
    attr.cb_size = 0U;
    attr.stack_mem = NULL;
    //进程需要打印内容，我们将内存大小增加一些
    attr.stack_size = 1024*2;
    attr.priority = 25;

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

APP_FEATURE_INIT(LedExampleEntry);

在这里插入图片描述

GPIO中断

接口简介

wifiiot_gpio.h接口简介
wifiiot_gpio.h中包含声明GPIO中断相关函数。

接口名功能
unsigned int GpioRegisterIsrFunc(WifiIotGpioIdx id, WifiIotGpioIntType intType, WifiIotGpioIntPolarity intPolarity,GpioIsrCallbackFunc func, char *arg)设置GPIO引脚中断功能
unsigned int GpioUnregisterIsrFunc(WifiIotGpioIdx id)取消GPIO引脚中断
unsigned int GpioSetIsrMask(WifiIotGpioIdx id, unsigned char mask)屏蔽GPIO引脚中断
unsigned int GpioSetIsrMode(WifiIotGpioIdx id, WifiIotGpioIntType intType, WifiIotGpioIntPolarity intPolarity)设置GPIO引脚中断触发模式

查看按键对应的GPIO引脚

F1和F2按键对应的GPIO引脚是分别是GPIO11和GPIO12，通过检查GPIO的电平信号来判断按键的状态。
在这里插入图片描述
在这里插入图片描述

通过按键控制LED

#include <stdio.h>
#include <unistd.h>

#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"

static void F1_Pressed(char *arg)
{
    (void)arg;
    GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_2, 1);
}
static void F2_Pressed(char *arg)
{
    (void)arg;
    GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_2, 0);
}
static void ButtonExampleEntry(void)
{
    GpioInit();

    //初始化LED灯
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_2, WIFI_IOT_IO_FUNC_GPIO_2_GPIO);

    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_2, WIFI_IOT_GPIO_DIR_OUT);

    //初始化F1按键，设置为下降沿触发中断
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_IO_FUNC_GPIO_11_GPIO);

    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_GPIO_DIR_IN);
    IoSetPull(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_IO_PULL_UP);
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_INT_TYPE_EDGE, WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW, F1_Pressed, NULL);

    //初始化F2按键，设置为下降沿触发中断
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_IO_FUNC_GPIO_12_GPIO);

    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_GPIO_DIR_IN);
    IoSetPull(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_IO_PULL_UP);
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_INT_TYPE_EDGE, WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW, F2_Pressed, NULL);
}

APP_FEATURE_INIT(ButtonExampleEntry);

按下F1LED灯会打开，按下F2LED灯会熄灭。

GPIO中断扩展实验

#include <stdio.h>
#include <unistd.h>

#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"

static void F1_Pressed(char *arg)
{
    (void)arg;
    GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_2, 1);
    printf("This is F1_Pressed\r\n");
    //将GPIO11设置为上升沿
    GpioSetIsrMode(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_INT_TYPE_EDGE,WIFI_IOT_GPIO_EDGE_RISE_LEVEL_HIGH);
}
static void F2_Pressed(char *arg)
{
    (void)arg;
    GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_2, 0);
    printf("This is F2_Pressed\r\n");
    //屏蔽GPIO12的中断
    GpioSetIsrMask(WIFI_IOT_IO_NAME_GPIO_12,1);
}
static void ButtonExampleEntry(void)
{
    GpioInit();

    //初始化LED灯
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_2, WIFI_IOT_IO_FUNC_GPIO_2_GPIO);

    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_2, WIFI_IOT_GPIO_DIR_OUT);

    //初始化F1按键，设置为下降沿触发中断
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_IO_FUNC_GPIO_11_GPIO);

    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_GPIO_DIR_IN);
    IoSetPull(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_IO_PULL_UP);
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_INT_TYPE_EDGE, WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW, F1_Pressed, NULL);

    //初始化F2按键，设置为下降沿触发中断
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_IO_FUNC_GPIO_12_GPIO);

    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_GPIO_DIR_IN);
    IoSetPull(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_IO_PULL_UP);
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_INT_TYPE_EDGE, WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW, F2_Pressed, NULL);
}

APP_FEATURE_INIT(ButtonExampleEntry);

按下F1后GPIO11被设置为上升沿，此时按下F1没有输出，抬起F1后输出。（抬起时会出现低电平向高电平跳变，但是这种跳变不稳定，可能会波动多次最终稳定高电平，所以一次抬起会触发多次上升沿，不建议之后做抬起时的上升沿中断。）
按下F2后GPIO12中断被屏蔽，此时再次按下F2无输出。

扩展2

使用电平模式中断时，因为只有引脚处于高/低电平，就会不停引发中断导致系统错误，所以使用时，需要在调用函数中及时屏蔽监听或更换监听，使其不至于一直触发。

#include <stdio.h>
#include <unistd.h>

#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"
static void F1_Pressed_up(char *arg);
static void F1_Pressed_down(char *arg)
{
    (void)arg;
    GpioUnregisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11);
    GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_2, 1);
    printf("This is F1_Pressed_down\r\n");
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_INT_TYPE_LEVEL,WIFI_IOT_GPIO_EDGE_RISE_LEVEL_HIGH,F1_Pressed_up,NULL);
}
static void F1_Pressed_up(char *arg)
{
    (void)arg;
    GpioUnregisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11);
    GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_2, 0);
    printf("This is F1_Pressed\r\n");
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_INT_TYPE_LEVEL,WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW,F1_Pressed_down,NULL);
}

static void ButtonExampleEntry(void)
{
    //初始化GPIO
    GpioInit();
    //初始化LED
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_2,WIFI_IOT_IO_FUNC_GPIO_2_GPIO);
    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_2,WIFI_IOT_GPIO_DIR_OUT);
    //初始化F1按键
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_IO_FUNC_GPIO_2_GPIO);
    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_GPIO_DIR_IN);
    IoSetPull(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_GPIO_EDGE_RISE_LEVEL_HIGH);
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_INT_TYPE_LEVEL,WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW,F1_Pressed_down,NULL);
}

APP_FEATURE_INIT(ButtonExampleEntry);

按下后LED亮起，抬起后LED灯熄灭。

PWM输出

wifiiot_pwm.h接口简介

接口名功能
unsigned int PwmInit (WifiIotPwmPort port)初始化PWM
unsigned int PwmDeinit (WifiIotPwmPort port)取消初始化PWM
unsigned int PwmStart (WifiIotPwmPort port, unsigned short duty, unsigned short freq )根据输入参数输出PWM
unsigned int PwmStop(WifiIotPwmPort port);停止PWM输出

PwmInit()

unsigned int PwmInit (WifiIotPwmPort port)

描述：
初始化PWM功能

参数：

名字描述
id表示GPIO引脚号.
val表示要设置的上拉或下拉.

PwmStart()

unsigned int PwmStart (WifiIotPwmPort port, unsigned short duty, unsigned short freq )

描述：

根据输入参数输出PWM信号。

参数：

名字描述
portPWM端口号.
duty占空比.
freq分频倍数.

输出PWM波来改变LED亮度

#include <stdio.h>
#include <unistd.h>

#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"
static void F1_Pressed_up(char *arg);
static void F1_Pressed_down(char *arg)
{
    (void)arg;
    GpioUnregisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11);
    GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_2, 1);
    printf("This is F1_Pressed_down\r\n");
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_INT_TYPE_LEVEL,WIFI_IOT_GPIO_EDGE_RISE_LEVEL_HIGH,F1_Pressed_up,NULL);
}
static void F1_Pressed_up(char *arg)
{
    (void)arg;
    GpioUnregisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11);
    GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_2, 0);
    printf("This is F1_Pressed\r\n");
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_INT_TYPE_LEVEL,WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW,F1_Pressed_down,NULL);
}

static void ButtonExampleEntry(void)
{
    //初始化GPIO
    GpioInit();
    //初始化LED
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_2,WIFI_IOT_IO_FUNC_GPIO_2_GPIO);
    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_2,WIFI_IOT_GPIO_DIR_OUT);
    //初始化F1按键
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_IO_FUNC_GPIO_2_GPIO);
    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_GPIO_DIR_IN);
    IoSetPull(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_GPIO_EDGE_RISE_LEVEL_HIGH);
    GpioRegisterIsrFunc(WIFI_IOT_IO_NAME_GPIO_11,WIFI_IOT_INT_TYPE_LEVEL,WIFI_IOT_GPIO_EDGE_FALL_LEVEL_LOW,F1_Pressed_down,NULL);
}

APP_FEATURE_INIT(ButtonExampleEntry);

看到4秒内从暗到明，然后顺间熄灭，重新开始。

# harmonyos # stm32 # 物联网
Logo
华为开发者空间

华为开发者空间，是为全球开发者打造的专属开发空间，汇聚了华为优质开发资源及工具，致力于让每一位开发者拥有一台云主机，基于华为根生态开发、创新。

更多推荐

cover

GaussDB全密态数据库等值查询

avatar 华为开发者空间
cover

一文带你搞懂GaussDB数据库性能调优

avatar 华为开发者空间
cover

COC云运维中心新特性解读，让智能运维更高效

avatar 华为开发者空间