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; }