单片机PWM技术实现呼吸灯和KTV等娱乐场所的灯光闪烁效果

单片机PWM技术实现呼吸灯和KTV等娱乐场所的灯光闪烁效果程序是在51hei单片机开发板上面做的，电路很简单，最小系统+P0的八个led即可.ADDR0和ENLED那是开发板上的led使能电路控制端，如果是你自己做的电路可以删掉这几个语句.或者不用管他，不会影响程序的运行./*************************************************** ************************************************* *********** @file:main.c* @author :xr* @date:2014年4月15日20:34:05 - 2014年4月15日22:28:08* @version: V1.2.3* @brief :PWM技术实现呼吸灯和KTV等娱乐场所的灯光闪烁效果单片机STC89C52RC MCU 晶振 11.0592MHZ************************************************* ************************************************* ***********/#include ;//74HC138sbit ADDR0 = P1^0;sbit ADDR1 = P1^1;sbit ADDR2 = P1^2;sbit ADDR3 = P1^3;sbit ENLED = P1^4;//sbit PWMOUT = P0^0;//PWM输出#define PWMOUT P0//8个LED小灯同时呼吸//灯光控制编码(调整PWM的占空比)unsigned char code PWM_Table[] = {1, 3, 8, 11, 14, 17, 20, 23, 26, 29, 32, 35, 38, 41, 44, 47, 50,53, 56, 59, 62, 65, 68, 71, 74, 77, 80, 83, 86, 89, 92, 95, 98, 99}; //34个占空比unsigned char heighHR0, heighLR0;//PWM高电平计数初值的高字节和低字节unsigned char lowHR0, lowLR0;//PWM低电平计数初值的高字节和低字节unsigned char thr1, tlr1;//T1计数初值高字节和低字节unsigned long PWMCounter = 0;//PWM设定频率后的对应的所需计数值 UL型void Initial();void ConfigPWM(unsigned int fr, unsigned char dc); void ConfigTimer1(unsigned int xms);void main(void){Initial();/**********呼吸灯效果***************/ ConfigPWM(100, 5);//设定PWM的脉冲宽度为100hz，即10ms，占空比为5%，当PWM的脉冲宽度小于100HZ时，形成的是闪烁的灯光效果ConfigTimer1(50); //定时50ms调整PWM占空比/*PWM技术实现KTV等娱乐场所的灯光闪烁效果*/ /***************灯光闪烁****************//*ConfigPWM(10, 5); //PWM脉冲宽度为10HZ，即1ms, 占空比5%ConfigTimer1(50); //定时20ms调整PWM占空比*/while (1);}/*初始化*/void Initial(){ADDR3 = 1;ENLED = 0;//选择LEDADDR2 = 1;ADDR1 = 1;ADDR0 = 0;//选择LEDS6，即流水灯}/*使用定时器T0配置PWM*/void ConfigPWM(unsigned int fr, unsigned char dc) //参数：fr PWM配置的频率，当是100时，即是100HZ，周期是10ms，dc为占空比{unsigned long tmp;unsigned int heigh, low;//分别存放高电平计数值和低电平计数值tmp = 11059200/12;//一个机器周期的计数频率PWMCounter = tmp / fr;//一个机器周期计数频率是多少个fr计数频率，即fr频率需要的计数值heigh = (PWMCounter * dc) / 100;//高电平所需计数值1/fr周期内高电平计数值low= PWMCounter - heigh;//低电平所需计数值 1/fr 周期内低电平计数值heigh = 65536-heigh;//高电平时定时器需要装入的初值low= 65536-low;//低电平时定时器需要装入的初值heighHR0 = (unsigned char)(heigh >;>; 8); heighLR0 = (unsigned char)heigh;lowHR0= (unsigned char)(low >;>; 8);lowLR0= (unsigned char)low;TMOD &= 0xF0;//清零T0控制位TMOD |= 0x01;//Timer0方式1,16位可设定定时模式TH0 = heighHR0;TL0 = heighLR0;//装入高电平时的初值PWMOUT = 0xFF;//开始PWM输出高电平TR0 = 1;//启动定时器T0ET0 = 1;//开启T0中断EA = 1;//开总中断}/*配置定时器Timer1，用于定时xms调整PWM的占空比*/void ConfigTimer1(unsigned int xms){unsigned long tmp;tmp = 11059200/12;//一个机器周期的计数频率tmp = (tmp * xms) /1000;//定时xms需要的计数频率(即计数次数)tmp = 65536-tmp;//定时xms需要装入的计数初值thr1 = (unsigned char)(tmp >;>; 8);//取高八位tlr1 = (unsigned char)tmp;TMOD &= 0x0F;//清零T1控制位TMOD |= 0x10;//定时器T1方式1,16位可设定时器TH1 = thr1;TL1 = tlr1;TR1 = 1;//启动timer1ET1 = 1;//开启定时器T1中断EA = 1;//开启总中断}/*调整PWM占空比*/void AdjustPWMdc(unsigned char dc){unsigned int heigh, low;heigh = (PWMCounter * dc) / 100; //PWM脉冲中高脉冲所需计数值low= PWMCounter - heigh;//PWM脉冲中低脉冲所需的计数值heigh = 65536-heigh;//高脉冲装入计数的初值low= 65536-low; //低脉冲装入计数的初值/*调整PWM高低脉冲计数初值，来调整PWM的占空比*/heighHR0 = (unsigned char)(heigh >;>; 8); heighLR0 = (unsigned char)heigh;lowHR0= (unsigned char)(low >;>; 8);lowLR0= (unsigned char)low;}/*定时器Timer0中断服务*/void Timer0_ISP() interrupt 1{//在中断中对PWM的输出电平进行判断，若当前输出是高电平，则开始装入低电平的计数初值，PWM输出低电平if (PWMOUT){//Timer0装入PWM一个周期中低脉冲的计数初值TH0 = lowHR0;TL0 = lowLR0;PWMOUT = 0x00;//PWM输出低电平}else //否则装入高电平的计数初值，输出高电平{//Timer0装入PWM一个周期中高脉冲的计数初值TH0 = heighHR0;TL0 = heighLR0;PWMOUT = 0xFF;//PWM输出高脉冲}}/*定时器Timer1中断服务*/void Timer1_ISP() interrupt 3{//注意：index和dir在每次进入中断后都要使用上一次的值，因此必须定义为静态类型static unsigned char index = 0;//占空比索引static bit dir = 0;//方向位，0灯光由亮->;暗 1灯光由暗->;亮TH1 = thr1;TL1 = tlr1;AdjustPWMdc(PWM_Table[index]);//调用调整PWM占空比函数，调整PWM占空比 if (dir == 0){index++;//索引++if (index >;= 33)//34个占空比{index = 33;dir = 1;//改变方向}}else{index--; //索引--if (index == 0){index = 0;dir = 0;//改变方向}}}。