一、树莓派非PWM引脚，模拟PWM调光
#include <stdio.h>#include <stdlib.h>#include <wiringPi.h>#include <pthread.h>unsigned int bedroom_brightness;void *bedroom_brightness_set(void *arg)//线程函数{while(1){// 设置一个周期为1ms，占空比为60%//2引脚低电平时发光digitalWrite(2, LOW);delayMicroseconds(1000-(bedroom_brightness*100));//高电平时熄灭digitalWrite(2, HIGH);delayMicroseconds(bedroom_brightness*100); // 微秒级延迟，0.4ms//}}}void main(){pthread_t id;id = pthread_create(&id, NULL, bedroom_brightness_set, NULL);//创建线程wiringPiSetup(); //初始化硬件环境pinMode(2, OUTPUT); while(1){printf("brightness;");scanf("%d", &bedroom_brightness);//设定亮度，数值(0-10)}}
二、树莓派PWM引脚调光
PS：仅支持PWM引脚，树莓派PWM引脚默认有GPIO1，其他参考引脚图
#include <wiringPi.h>void bedroom_brightness_set(int *bedroom_brightness, int *bright_last){if(*bedroom_brightness < *bright_last)//调低亮度（下一次设定的亮度小于当前亮度）{for(*bright_last; *bedroom_brightness<*bright_last; --*bright_last){pwmWrite(1, *bright_last);//向pwm中写入任意自己想要的值(默认0-1024)delay(1);}printf("亮度变低\n");}else if(*bedroom_brightness > *bright_last)//调高亮度（下一次设定的亮度大于当前亮度）{for(*bright_last; *bright_last<*bedroom_brightness; ++*bright_last){pwmWrite(1, *bright_last); //数值范围（0-1024）delay(1);}printf("亮度变高\n");}*bright_last = *bedroom_brightness;}
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