boxing2.c

基于lpc2114的波形产生程序

#include <LPC21xx.H> 
void init_time0(void);
void  e_int0(void)	__irq;
void  e_int1(void)	__irq;
void  e_int2(void)	__irq;
void  e_int3(void)	__irq;
void init_pll(void);
void T0isr (void)	__irq;
void initirq(void);
unsigned char flag=1;
char x=1;        							//中断标志 
long y=0;							//周期计数器，一个周期为200
long dacdata1=0;						//da数据输出
long dacdata;							//数据输出脚 

unsigned int tosin[256]={0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,0xb1,0xb4,0xb7,0xba,0xbc,0xbf,0xc2,0xc5 

,0xc7,0xca,0xcc,0xcf,0xd1,0xd4,0xd6,0xd8,0xda,0xdd,0xdf,0xe1,0xe3,0xe5,0xe7,0xe9,0xea,0xec,0xee,0xef,0xf1,0xf2,0xf4,0xf5 

,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfd 

,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf4,0xf2,0xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,0xdd,0xda 

,0xd8,0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99 

,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,0x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,0x5a,0x57,0x55,0x51 

,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29,0x27,0x25,0x22,0x20,0x1e,0x1c,0x1a,0x18,0x16 

,0x15,0x13,0x11,0x10,0x0e,0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00 

,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02 ,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,0x10,0x11,0x13,0x15 

,0x16,0x18,0x1a,0x1c,0x1e,0x20,0x22,0x25,0x27,0x29,0x2b,0x2e,0x30,0x33,0x35,0x38,0x3a,0x3d,0x40,0x43,0x45,0x48,0x4c,0x4e 

,0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66 ,0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80 }; 



int main(void)
{
	init_pll();
	initirq();
	init_time0();
	IODIR1			= 0x00FF0000;						//Set the LED pins as outputs
	IOCLR1			= 0x00FF0000;						//Clear the LED pins	
PINSEL0 &=0x000FFFFF;
PINSEL1	&=0xFFFFFFF0;  
	IODIR0 		 |= 0x0003FC00; 		 //低4位输出功能
	VICVectAddr0 = (unsigned)T0isr;		
	VICVectCntl0 = 0x00000024;			
	VICIntEnable |= 0x00000010;			
	while(1){  }  
}


void init_time0(void)
{
//	PINSEL0 	|= 0x00000800;	 //p193,设置P0.5为 MAT0.1功能
	T0PR 		= 29;			 //p277,P282,timer0预分频系数29+1,1MHZ
	T0MCR 		= 0x03;			//p277,匹配时动作:复位
	T0MR0		= 0x4E;	   //p277,设置timer0匹配值,统计10000个1us即10毫秒
	T0EMR  		= 0x02;			//p279,匹配时外部引脚状态翻转
	T0TCR 		= 0x02;			//p276,计数器复位,中断,禁止工作
	T0TCR 		= 0x01;			//启动定时器工作	
}

void init_pll(void)
{
	PLLCFG = 0x00000025;				      	// P170,倍频系数为M=6,系数P=2,60Mcclk
	PLLCON = 0x00000001;				      	// PLL使能
	PLLFEED = 0x000000AA;						// 使PLLCFG,PLLCON更改有效
	PLLFEED = 0x00000055;
	while (!(PLLSTAT & 0x00000400)); 			// 测试PLL是否锁定.
	PLLCON  = 0x00000003;				      	// 连接PLL,使其起作用
	PLLFEED = 0x000000AA;				   		//更改有效
	PLLFEED = 0x00000055;
	VPBDIV  = 0x00000002;				      	//P174,设置VPB总线频率,2分频,30M
}

void T0isr (void)	__irq
{    
y++;
if(y==256)
y=0;
dacdata1=y;                                              
 
                                             
if(x==0)
{
IO1PIN	=tosin[dacdata1]<<16;	 					

} 

else
if(x==1)
{	if(dacdata1<128)	
dacdata=dacdata1<<16;
else dacdata=(256-dacdata1)<<16;
IO1PIN	=dacdata;
}

else
if(x==2)
{
if(dacdata1==1)	{	dacdata=0x00<<16;IO1PIN	=dacdata;}
else if(dacdata1==128)	{dacdata=0xFF<<16; IO1PIN	=dacdata; }		 
}


else
{
dacdata=0xFF<<16;
IO1PIN	=dacdata;
}  	

	

T0IR 		|= 0x00000001;			//Clear match 0 interrupt
VICVectAddr 	= 0x00000000;	

}
 

void initirq(void)
{
EXTPOLAR=0x00;                                                   //设置中断方式为下降沿触发
EXTMODE=0x0F;

PINSEL0 		= 0x000CC0CC;						//Enable the EXTINT1 interrupt   p0.14
//PINSEL0 		= 0x000000C0;				//Enable the EXTINT0~3 interrupt

VICIntSelect 	= 0x00000000;					//Enable no Vic Channel as IRQ
VICVectAddr1 = (unsigned)e_int0; 				//外中断地址设置
VICVectAddr2 = (unsigned)e_int1; 				//外中断地址设置
VICVectAddr3 = (unsigned)e_int2; 				//外中断地址设置
VICVectAddr4 = (unsigned)e_int3; 				//外中断地址设置
VICVectCntl1	= 0x0000002E;  						//select a priority slot for a given interrupt
VICVectCntl2	= 0x0000002F;  						//select a priority slot for a given interrupt
VICVectCntl3	= 0x00000030;  						//select a priority slot for a given interrupt
VICVectCntl4	= 0x00000031;  						//select a priority slot for a given interrupt
VICIntEnable 	= 0x0003C000;						//enable interrupt

 
}


void e_int0(void)	__irq					//外中断0
{
x 	= 0x00;							//区分中断管脚
EXTINT  = 0x00000001;						//Clear the peripheral interrupt flag
VICVectAddr = 0x00000000;

}


void e_int1(void)	__irq					//外中断1
{
x 	= 0x01;							//区分中断管脚
EXTINT  = 0x00000002;						//Clear the peripheral interrupt flag
VICVectAddr = 0x00000000;
}



void e_int2(void)	__irq					//外中断1
{
x 	= 0x02;							//区分中断管脚
EXTINT  = 0x00000004;						//Clear the peripheral interrupt flag
VICVectAddr = 0x00000000;
}


void e_int3(void)	__irq					//外中断1
{
x 	= 0x03;							//区分中断管脚
EXTINT  = 0x00000008;						//Clear the peripheral interrupt flag
VICVectAddr = 0x00000000;
}