HarmonyOS鸿蒙Next中Hi3861炫彩灯、蜂鸣音学习练习效果展示与代码分享

HarmonyOS鸿蒙Next中Hi3861炫彩灯、蜂鸣音学习练习效果展示与代码分享 蛟龙腾飞南向设备研修日志展示，不足之处欢迎大家指正。因为文章不能插入视频，用截图展示。

使用炫彩灯板，经过 Linux 的编译，以及 HiBurn 的烧录，执行的效果炫彩灯板中的灯光会依据红绿蓝依次闪烁 3 次。

代码如下：

#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"
#include "wifiiot_adc.h"
#include "wifiiot_errno.h"

#define LED_DELAY_TIME_US 300000
#define LED_BRIGHT WIFI_IOT_GPIO_VALUE1
#define LED_DARK WIFI_IOT_GPIO_VALUE0

#define NUM_BLINKS 2

static void jltfcloudcom(void *arg)
{
    (void)arg;

    IoSetFunc(RED_LED_PIN_NAME, RED_LED_PIN_FUNCTION);
    IoSetFunc(GREEN_LED_PIN_NAME, GREEN_LED_PIN_FUNCTION);
    IoSetFunc(BLUE_LED_PIN_NAME, BLUE_LED_PIN_FUNCTION);

    GpioSetDir(RED_LED_PIN_NAME, WIFI_IOT_GPIO_DIR_OUT);
    GpioSetDir(GREEN_LED_PIN_NAME, WIFI_IOT_GPIO_DIR_OUT);
    GpioSetDir(BLUE_LED_PIN_NAME, WIFI_IOT_GPIO_DIR_OUT);

    for(int i = 0; i <= NUM_BLINKS; i++)
    {
        for(unsigned int j = 0; j < sizeof(pins)/sizeof(pins[0]); j++)
        {
            GpioSetOutputVal(pins[j], LED_BRIGHT);
            usleep(LED_DELAY_TIME_US);
            GpioSetOutputVal(pins[j], LED_DARK);
        }
    }
}

APP_FEATURE_INIT(jltfcloudcom);

这里使用炫彩灯板的三色灯演示灯光频率的大小，使用到了 PWM，控制灯光的频率，灯光颜色逐渐变亮。

这里也是红绿蓝依次闪烁 2 次：

代码如下：

#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"
#include "wifiiot_adc.h"
#include "wifiiot_errno.h"

#define LED_DELAY_TIME_US 300000
#define LED_BRIGHT WIFI_IOT_GPIO_VALUE1
#define LED_DARK WIFI_IOT_GPIO_VALUE0

#define RED_LED_PIN_NAME WIFI_IOT_IO_NAME_GPIO_10
#define RED_LED_PIN_FUNCTION WIFI_IOT_IO_FUNC_GPIO_10_GPIO
#define GREEN_LED_PIN_NAME WIFI_IOT_IO_NAME_GPIO_11
#define GREEN_LED_PIN_FUNCTION WIFI_IOT_IO_FUNC_GPIO_11_GPIO
#define BLUE_LED_PIN_NAME WIFI_IOT_IO_NAME_GPIO_12
#define BLUE_LED_PIN_FUNCTION WIFI_IOT_IO_FUNC_GPIO_12_GPIO

#define NUM_BLINKS 2

#define PWM_FREQ_DIVITION 64000

static void jltfcloudcom(void *arg)
{
    (void)arg;

    IoSetFunc(RED_LED_PIN_NAME, WIFI_IOT_IO_FUNC_GPIO_10_PWM1_OUT);
    IoSetFunc(GREEN_LED_PIN_NAME, WIFI_IOT_IO_FUNC_GPIO_11_PWM2_OUT);
    IoSetFunc(BLUE_LED_PIN_NAME, WIFI_IOT_IO_FUNC_GPIO_12_PWM3_OUT);

    PwmInit(WIFI_IOT_PWM_PORT_PWM1);
    PwmInit(WIFI_IOT_PWM_PORT_PWM2);
    PwmInit(WIFI_IOT_PWM_PORT_PWM3);

    static const WifiIotGpioIdx pins[] = {RED_LED_PIN_NAME, GREEN_LED_PIN_NAME, BLUE_LED_PIN_NAME};

    for(int i = 1; i <= NUM_BLINKS; i++)
    {
        for(int i = 1; i <= PWM_FREQ_DIVITION; i *= 2)
        {
            PwmStart(WIFI_IOT_PWM_PORT_PWM1, i, PWM_FREQ_DIVITION);
            usleep(250000);
            PwmStop(WIFI_IOT_PWM_PORT_PWM1);
        }
    }
}
APP_FEATURE_INIT(jltfcloudcom);

接下来这里使用到了炫彩灯板的光敏电阻，控制灯光的亮暗，当光敏电阻被遮挡住，灯光变暗，不挡着灯光亮：

代码如下：

#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"
#include "wifiiot_adc.h"
#include "wifiiot_errno.h"

#define PWM_FREQ_DIVITION 64000
#define ADC_RESOLUTION 4996

static void jltfcloudcom(void *arg)
{
    (void)arg;

    IoSetFunc(RED_LED_PIN_NAME, WIFI_IOT_IO_FUNC_GPIO_10_PWM1_OUT);
    IoSetFunc(GREEN_LED_PIN_NAME, WIFI_IOT_IO_FUNC_GPIO_11_PWM2_OUT);
    IoSetFunc(BLUE_LED_PIN_NAME, WIFI_IOT_IO_FUNC_GPIO_12_PWM3_OUT);

    PwmInit(WIFI_IOT_PWM_PORT_PWM1);
    PwmInit(WIFI_IOT_PWM_PORT_PWM2);
    PwmInit(WIFI_IOT_PWM_PORT_PWM3);

    while(1)
    {
        unsigned short data = 0;
        unsigned short duty = 0;

        if(AdcRead(HUMAN_SENSOR_CHAN_NAME, &data, WIFI_IOT_ADC_EQU_MODEL_4, WIFI_IOT_ADC_CUR_BAIS_DEFAULT, 0) == WIFI_IOT_SUCCESS)
        {
            printf("data:%d", data);
            duty = PWM_FREQ_DIVITION * (1948 - (unsigned int)data) / ADC_RESOLUTION;
        }

        PwmStart(WIFI_IOT_PWM_PORT_PWM2, duty, PWM_FREQ_DIVITION);
        usleep(100000);
        PwmStop(WIFI_IOT_PWM_PORT_PWM2);
    }
}
APP_FEATURE_INIT(jltfcloudcom);

这里还用到了三色灯板上面的红外感应器的功能，当人体靠近，红外感应感受到了，灯光变亮，未感受到变暗：

还用到了三色灯板的蜂鸣器，演唱两只老虎的旋律：