图（7）程序流程图
#include
#define uchar unsigned char #define uint unsigned int sbit lcdrw=P3^3; sbit lcdrs=P3^2; sbit lcde=P3^4; sbit d=P2^7; sbit s1=P2^0; sbit s2=P2^1; sbit s3=P2^2; sbit cs=P3^5; sbit wr=P3^6;
uchar s1num,a,ys,j; uint fre;
uchar code 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 };/*正弦波码 */
void delay(uint z) //延时子程序 {
uchar i,j;
for(i=z;i>0;i--)
for(j=110;j>0;j--); }
void delay1(uint y) {
uint i;
for(i=y;i>0;i--); }
void write_com(uchar com) //1602写指令 {
lcdrs=0; P1=com; delay(5); lcde=1; delay(5); lcde=0; }
void write_data(uchar date) //1602数据 {
lcdrs=1; P1=date; delay(5); lcde=1; delay(5); lcde=0;
}
void init() //初始化 {
lcdrw=0; lcde=0; wr=0; cs=0;
write_com(0x38); write_com(0x0c); write_com(0x06); write_com(0x01);
write_com(0x80+0x00);
write_data(0x77); //写wave: write_data(0x61); write_data(0x76); write_data(0x65); write_data(0x3a);
write_com(0x80+0x40); //写 f： write_data(0x66);
write_data(0x3a); }
void write_f(uint date) //写频率 {
uchar qian,bai,shi,ge; qian=date/1000; bai=date/100; shi=date/10; ge=date;
write_com(0x80+0x42); write_data(0x30+qian); write_data(0x30+bai); write_data(0x30+shi); write_data(0x30+ge); write_data(0x48); write_data(0x5a); }
void xsf() //显示频率 {
if(s1num==1) {
fre=(1000/(9+3*ys)); write_f(fre); }
if(s1num==2)
{
fre=(100000/(3*ys)); write_f(fre); }
if(s1num==3) {
fre=(1000/(15+3*ys)); write_f(fre); } }
void keyscanf() {
d=0;
if(s1==0) {
delay(5);
if(s1==0) {
while(!s1); s1num++; if(s1num==1) {
ys=0;
write_com(0x80+0x05); write_data(0x73); // write_data(0x69); write_data(0x6e); write_data(0x65); write_data(0x20); write_data(0x20); }
if(s1num==2) {
ys=10;
write_com(0x80+0x05); write_data(0x73); // write_data(0x71); write_data(0x75); write_data(0x61); write_data(0x72); write_data(0x65); } if(s1num==3)
写sine: 写squrae
{
ys=0;
write_com(0x80+0x05); //train write_data(0x74); write_data(0x72); write_data(0x61); write_data(0x69); write_data(0x6e); write_data(0x20); }
if(s1num==4) {
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)