简易函数发生器的设计 - 图文(6)

本科生课程设计（论文）

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unsigned char TH0D=0xFF; unsigned char TL0D=0x00; unsigned char index=0; unsigned char *ptr; //1ms延时函数

void delayms(unsigned int i) {

unsigned int j; for(;i!=0;i--) {

for(j=0;j<123;j++); }

//定时器0初始化函数 void timer0_init(void) {

TMOD=0x11; TH0=TH0D; TL0=TL0D; ET0=1; EA=1; TR0=1;

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}

本科生课程设计（论文）

}

//定时器T0中断函数

void timer0_isr(void)interrupt 1 using 0 {

P2_7=~P2_7; TH0=TH0D; TL0=TL0D; P1=ptr[index]; index++; } //主程序 int main(void) {

timer0_init(); ptr=sin_tab; while(1) {

if(!P2_0) {

delayms(10); if(!P2_0)TL0D++; }

else if(!P2_1) {

delayms(10); if(!P2_1)TL0D--; } else if(!P2_2)

{

ptr= Triangle_tab; } else

{

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本科生课程设计（论文）

}

ptr=sin_tab; } } return 0;

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