[文章]鸿蒙Hi3861小视频参赛：自家开发版上实现三色灯的变化
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这里使用的是hi3861的三色灯板块，实现的是三色灯的变换，可以设置三色灯变换的次数，灯光变换的频率。
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
//设置灯光的初始值
#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);
}
for(int i = 1 ; i <= PWM_FREQ_DIVITION ; i *= 2 ){
PwmStart(WIFI_IOT_PWM_PORT_PWM2,i,PWM_FREQ_DIVITION);
usleep(250000);
PwmStop(WIFI_IOT_PWM_PORT_PWM2);
}
for(int i = 1 ; i <= PWM_FREQ_DIVITION ; i *= 2){
PwmStart(WIFI_IOT_PWM_PORT_PWM3,i,PWM_FREQ_DIVITION);
usleep(250000);
PwmStop(WIFI_IOT_PWM_PORT_PWM3);
}
for(unsigned j = 0 ; j < sizeof(pins)/sizeof(pins[0]);j++){
GpioSetOutputVal(pins[j],LED_BRIGHT);
usleep(LED_DELAY_TIME_US);
GpioSetOutputVal(pins[j],LED_DARK);
usleep(LED_DARK);
}
}
}
static void jltfcloudcn(void)
{
osThreadAttr_t attr;
GpioInit();
attr.name="jltfcloudcom";
attr.attr_bits=0U;
attr.cb_mem=NULL;
attr.cb_size=0U;
attr.stack_mem=NULL;
attr.stack_size=4096;
attr.priority=osPriorityNormal;
if(osThreadNew(jltfcloudcom,NULL,&attr) == NULL){
printf("[jltfcloudcn] Failed to create jltfcloudcom!n");
}
}
APP_FEATURE_INIT(jltfcloudcn);
以上功能实现，参考了网络上部分的公开代码。
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