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   源码介绍

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实例内涵取模工具，初始代码完成童年的播放
用正点原子源码改的代码，精英版可以直接使用

void PWM_Init(unsigned int arr,unsigned int psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);

//GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE); //Timer4ÖØÓ³Éä TIM4_CH3->PB8    
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //¸´ÓÃÍÆÍìÊä³ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//³õʼ»¯GPIO

TIM_TimeBaseStructure.TIM_Period = (144000/arr);//Ö¸¶¨ÔÚÏÂÒ»´Î¸üÐÂʼþʱ¼ÓÔص½»î¶¯×Ô¶¯ÖØмÓÔؼĴæÆ÷ÖеÄÖÜÆÚÖµ
TIM_TimeBaseStructure.TIM_Prescaler =499;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High; //Êä³ö¼«ÐÔ:TIMÊä³ö±È½Ï¼«ÐÔ¸ß
TIM_OCInitStructure.TIM_OutputState= TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse=(144000/arr)/2;  //Ö¸¶¨Òª¼ÓÔص½²¶»ñ±È½Ï¼Ä´æÆ÷ÖеÄÂö³åÖµ                                         
TIM_OC3Init(TIM4, &TIM_OCInitStructure);  //³õʼ»¯TIM4µÄCH3ͨµÀ
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);  //ʹÄÜTIM4ÔÚCH3ͨµÀCCR3ÉϵÄԤװÔԼĴæÆ÷
TIM_ARRPreloadConfig(TIM4,ENABLE);//ʹÄÜTIM4ÔÚCH3ͨµÀARR3ÉϵÄԤװÔڼĴæÆ÷
TIM_Cmd(TIM4,ENABLE);  //ʹÄÜTIM4
}

void Jiepai(unsigned char J) 
{ 
switch (J) 
{   
case 0x00:   
JiePai = 1600; 
break;
case 0x01:   
JiePai = 800;   
break;   
case 0x02:   
JiePai = 400;   
break;   
case 0x03:   
JiePai = 200;   
break;   
case 0x04:   
JiePai = 100; 
break;   
case 0x66:   
JiePai = 600; 
break;
default:
JiePai = 600; 
break;
}
}
void Music(unsigned char Y)
{  
switch (Y) 
{  
case 0x0B:    
YinJie = MusicLow[0];  
break;   
case 0x0C:    
YinJie = MusicLow[1]; 
break;  
case 0x0D:    
YinJie = MusicLow[2];
break;  
case 0x0E:    
YinJie = MusicLow[3];  
break;   
case 0x0F:    
YinJie = MusicLow[4];  
break;   
case 0x10:    
YinJie = MusicLow[5]; 
break;   
case 0x11:    
YinJie = MusicLow[6];  
break;   
case 0x15:    
YinJie = MusicHigh[0];  
break;   
case 0x16:    
YinJie = MusicHigh[1];  
break;  
case 0x17:    
YinJie = MusicHigh[2];  
break;  
case 0x18:    
YinJie = MusicHigh[3];   
break;  
case 0x19:    
YinJie = MusicHigh[4];   
break;   
case 0x1A:    
YinJie = MusicHigh[5]; 
break;   
case 0x1B:    
YinJie = MusicHigh[6];   
break;  
case 0x1F:    
YinJie = MusicHigher[0];   
break;   
case 0x20:    
YinJie = MusicHigher[1];  
break;   
case 0x21:    
YinJie = MusicHigher[2];  
break;   
case 0x22:    
YinJie = MusicHigher[3];   
break;   
case 0x23:    
YinJie = MusicHigher[4];  
break;  
case 0x24:    
YinJie = MusicHigher[5];  
break;  
case 0x25:    
YinJie = MusicHigher[6];   
break;   
default:   
YinJie = 0;
break;
}
}