s1num=0; P1=0;

write_com(0x80+0x05; write_data(0x20; write_data(0x20; write_data(0x20; write_data(0x20; write_data(0x20; write_data(0x20; write_com(0x80+0x42; write_data(0x20; write_data(0x20; write_data(0x20; write_data(0x20; write_data(0x20; write_data(0x20; } } } if(s2==0 { delay(5; if(s2==0

{

while(!s2; ys++; } } if(s3==0 { delay(5; if(s3==0 {

while(!s3; ys--; } } }

void main( { init(; while(1 {

keyscanf(;

if(s1num==1 //正弦波// {

for(j=0;j<255;j++ {

P0=tosin[j]; delay1(ys; } }

if(s1num==2 //方波// { P0=0xff; delay1(ys; P0=0; delay1(ys; }

if(s1num==3 //三角波// { if(a<128 { P0=a; delay1(ys; } else {

P0=255-a;

delay1(ys; }

a++; }

if(!(s1&s2&s3 { xsf(; } } }

2、输出波形的种类与频率的测试

2.1、测量仪器及测试说明

测量仪器：稳压电源、示波器、数字万用表。