演示视频
题目讲解
首先根据系统程序框图来提前调试好各模块部分的功能。比如按键，数码管，PCF8591电压输出,温度读取。
然后看数码管显示界面
uchar SMG_mode=0;//控制数码管模式
uchar temp_var=25;//温度参数定义
int outV=325;//输出电压参数定义
signed long temp=0; //温度获取参数
bit output_mode=0;//输出电压模式
void main(void)
{
init(); //初始化开发板
while(1)
{
temp=rd_temperature();//获取温度
if(SMG_mode==0) //模式一温度显示
{
SMG[0]=23;SMG[1]=SMG[2]=SMG[3]=20;
SMG[4]=temp/100000;//20 0000
SMG[5]=temp%100000/10000+10;
SMG[6]=temp%10000/1000;
SMG[7]=temp%1000/100;
}
else if(SMG_mode==1)//模式二温度参数显示
{
SMG[0]=22;SMG[1]=SMG[2]=SMG[3]=SMG[4]=SMG[5]=20;
SMG[6]=temp_var/10;SMG[7]=temp_var%10;
}
else if(SMG_mode==2)//模式三输出电压参数显示
{
SMG[0]=24;SMG[1]=SMG[2]=SMG[3]=SMG[4]=20;
SMG[5]=outV/100+10;SMG[6]=outV%100/10;SMG[7]=outV%10;
}
SMG_output();
Jkey_scan();
}
}
写完记得烧录调试一下。
做完这些接着看按键扫描程序。
void Jkey_scan(void)
{
unsigned char i,key;
for(i=0x80;i>8;i >>=1)
{
if(i==0x80){
P44=0;P42=1;P3=~i;}
else if(i==0x40){
P44=1;P42=0;P3=~i;}
else {
P44=1;P42=1;P3=~i;}
if(i==0x80){
key=P3;key&=0x7f;}
else if(i==0x40){
key=P3;key&=0xbf;}
else {
key=P3;}
if((key&0x0f)!=0x0f)
{
Delay5ms();
if((key&0x0f)!=0x0f)
{
switch(key)
{
case 0x7b: //s5
if(output_mode==0)output_mode=1;
else output_mode=0;
break; //s5
case 0x77: //s4
if(SMG_mode==0)SMG_mode=1;
else if(SMG_mode==1)SMG_mode=2;
else SMG_mode=0;
break;
case 0xbb: //s9
if(SMG_mode==1){
temp_var+=1;}
break;
case 0xb7: //s8
if(SMG_mode==1){
temp_var-=1;}
break;
}
}
while((key&0x0f)!=0x0f)
{
key=P3;SMG_output(); //按下按键不影响数码管显示
}
}
}
}
电压输出功能。
if(output_mode==0)//电压输出模式一
{
if(temp_var>(temp/10000))
{
outV=0;
IIC_write(PCF8591_address,Output_address,0);//输出0v
}
else {
IIC_write(PCF8591_address,Output_address,255);outV=500;}//输出5v
}
else//电压输出模式二
{
//先把直线表示出来
//(255/5*4-255/5)/20 x -z== y z=102
//7.65x-102=y
IIC_write(PCF8591_address,Output_address,((7.65*(temp/10000))-102));
outV=(((7.65*(temp/10000))-102)*5/255)*100;
}
然后接着看题目。
LED指示灯。
if(output_mode==0){
led&=0xfe;}//l1点亮
else led|=0x01;
if(SMG_mode==0){
led&=0xfd;led|=0x04;led|=0x08;}//l2点亮
else if(SMG_mode==1){
led&=0xfb;led|=0x02;led|=0x08;}//l3点亮
else if(SMG_mode==2){
led&=0xf7;led|=0x04;led|=0x02;}//l4点亮
P2=0X80;P0=led;
完整程序
main.c
#include<stc15f2k60s2.h>
#include"intrins.h"
#include "iic.h"
#include "onewire.h"
#define uchar unsigned char
#define uint unsigned int
#define PCF8591_address 0x90
#define Move_address 0x03
#define Output_address 0x40
void SMG_output(void);
void init(void);
void Delay1ms(void);
void Jkey_scan(void);
void Delay5ms(void);
uchar tab[]={
0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,\
0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10,0xff,0xbf,0x8c,0xc6,0x88};//p c a
uchar SMG[8]={
20,20,20,20,20,20,20,20};//初始显示20，全息数码管
uchar SMG_mode=0;//控制数码管模式
uchar temp_var=25;//温度参数定义
int outV=325;//输出电压参数定义
signed long temp=0; //温度获取参数
bit output_mode=0;//输出电压模式 0为DAC 输出电压与温度相关。1为DAC 按照图 7 给出的关系输出电压。
uchar led=0xff;//led定义
void main(void)
{
init(); //初始化开发板
while(1)
{
temp=rd_temperature();//获取温度
if(SMG_mode==0) //模式一温度显示
{
SMG[0]=23;SMG[1]=SMG[2]=SMG[3]=20;
SMG[4]=temp/100000;//20 0000
SMG[5]=temp%100000/10000+10;
SMG[6]=temp%10000/1000;
SMG[7]=temp%1000/100;
}
else if(SMG_mode==1)//模式二温度参数显示
{
SMG[0]=22;SMG[1]=SMG[2]=SMG[3]=SMG[4]=SMG[5]=20;
SMG[6]=temp_var/10;SMG[7]=temp_var%10;
}
else if(SMG_mode==2)//模式三输出电压参数显示
{
SMG[0]=24;SMG[1]=SMG[2]=SMG[3]=SMG[4]=20;
SMG[5]=outV/100+10;SMG[6]=outV%100/10;SMG[7]=outV%10;
}
if(output_mode==0)//电压输出模式一
{
if(temp_var>(temp/10000))
{
outV=0;
IIC_write(PCF8591_address,Output_address,0);//输出0v
}
else {
IIC_write(PCF8591_address,Output_address,255);outV=500;}//输出5v
}
else//电压输出模式二
{
//先把直线表示出来
//(255/5*4-255/5)/20 x -z== y z=102
//7.65x-102=y
IIC_write(PCF8591_address,Output_address,((7.65*(temp/10000))-102));
outV=(((7.65*(temp/10000))-102)*5/255)*100;
}
if(output_mode==0){
led&=0xfe;}//l1点亮
else led|=0x01;
if(SMG_mode==0){
led&=0xfd;led|=0x04;led|=0x08;}//l2点亮
else if(SMG_mode==1){
led&=0xfb;led|=0x02;led|=0x08;}//l3点亮
else if(SMG_mode==2){
led&=0xf7;led|=0x04;led|=0x02;}//l4点亮
P2=0X80;P0=led;
SMG_output();
Jkey_scan();
}
}
void Jkey_scan(void)
{
unsigned char i,key;
for(i=0x80;i>8;i >>=1)
{
if(i==0x80){
P44=0;P42=1;P3=~i;}
else if(i==0x40){
P44=1;P42=0;P3=~i;}
else {
P44=1;P42=1;P3=~i;}
if(i==0x80){
key=P3;key&=0x7f;}
else if(i==0x40){
key=P3;key&=0xbf;}
else {
key=P3;}
if((key&0x0f)!=0x0f)
{
Delay5ms();
if((key&0x0f)!=0x0f)
{
switch(key)
{
case 0x7b: //s5
if(output_mode==0)output_mode=1;
else output_mode=0;
break; //s5
case 0x77: //s4
if(SMG_mode==0)SMG_mode=1;
else if(SMG_mode==1)SMG_mode=2;
else if(SMG_mode==2)SMG_mode=0;
break;
case 0xbb: //s9
if(SMG_mode==1){
temp_var+=1;}
break;
case 0xb7: //s8
if(SMG_mode==1){
temp_var-=1;}
break;
}
}
while((key&0x0f)!=0x0f)
{
key=P3;SMG_output(); //按下按键不影响数码管显示
}
}
}
}
void SMG_output(void)
{
uchar i;
for(i=0;i<8;i++)
{
P2=(P2&0X1F)|0Xc0;
P0=(1<<i);
P2=(P2&0X1F)|0Xe0;
P0=tab[SMG[i]];
Delay1ms();
}
P2=(P2&0X1F)|0Xc0;
P0=0Xff;
P2=(P2&0X1F)|0Xe0;
P0=0Xff;
}
void init(void)
{
P2=(P2&0X1F)|0XA0;
P0=0X00;
P2=(P2&0X1F)|0X80;
P0=0Xff;
P2=(P2&0X1F)|0Xc0;
P0=0Xff;
P2=(P2&0X1F)|0Xe0;
P0=0Xff;
}
void Delay5ms() //@11.0592MHz
{
unsigned char i, j;
i = 54;
j = 199;
do
{
while (--j);
} while (--i);
}
void Delay1ms(void) //@11.0592MHz
{
unsigned char i, j;
_nop_();
_nop_();
_nop_();
i = 11;
j = 190;
do
{
while (--j);
} while (--i);
}
iic.c
#include <STC15F2K60S2.H>
#include "iic.h"
#define DELAY_TIME 40
void IIC_write(uchar hw_address,uchar reg_address,uchar num)
{
IIC_Start();
IIC_SendByte(hw_address&0xfe);
IIC_WaitAck();
IIC_SendByte(reg_address);
IIC_WaitAck();
IIC_SendByte(num);
IIC_WaitAck();
IIC_Stop();
}
uchar IIC_read(uchar hw_address,uchar reg_address)
{
uchar num;
IIC_Start();
IIC_SendByte(hw_address&0xfe);
IIC_WaitAck();
IIC_SendByte(reg_address);
IIC_WaitAck();
IIC_Stop();
IIC_Start();
IIC_SendByte(hw_address|0x01);
IIC_WaitAck();
num=IIC_RecByte();
IIC_WaitAck();
IIC_Stop();
return num;
}
//
void IIC_Delay(unsigned char i)
{
do{
_nop_();}
while(i--);
}
//
void IIC_Start(void)
{
SDA = 1;
SCL = 1;
IIC_Delay(DELAY_TIME);
SDA = 0;
IIC_Delay(DELAY_TIME);
SCL = 0;
}
//
void IIC_Stop(void)
{
SDA = 0;
SCL = 1;
IIC_Delay(DELAY_TIME);
SDA = 1;
IIC_Delay(DELAY_TIME);
}
//
void IIC_SendAck(bit ackbit)
{
SCL = 0;
SDA = ackbit;
IIC_Delay(DELAY_TIME);
SCL = 1;
IIC_Delay(DELAY_TIME);
SCL = 0;
SDA = 1;
IIC_Delay(DELAY_TIME);
}
//
bit IIC_WaitAck(void)
{
bit ackbit;
SCL = 1;
IIC_Delay(DELAY_TIME);
ackbit = SDA;
SCL = 0;
IIC_Delay(DELAY_TIME);
return ackbit;
}
//
void IIC_SendByte(unsigned char byt)
{
unsigned char i;
for(i=0; i<8; i++)
{
SCL = 0;
IIC_Delay(DELAY_TIME);
if(byt & 0x80) SDA = 1;
else SDA = 0;
IIC_Delay(DELAY_TIME);
SCL = 1;
byt <<= 1;
IIC_Delay(DELAY_TIME);
}
SCL = 0;
}
//
unsigned char IIC_RecByte(void)
{
unsigned char i, da;
for(i=0; i<8; i++)
{
SCL = 1;
IIC_Delay(DELAY_TIME);
da <<= 1;
if(SDA) da |= 1;
SCL = 0;
IIC_Delay(DELAY_TIME);
}
return da;
}
iic.h
#ifndef _IIC_H
#define _IIC_H
#include "stc15f2k60s2.h"
#include "intrins.h"
#define uchar unsigned char
#define uint unsigned int
sbit SDA = P2^1;
sbit SCL = P2^0;
void IIC_Start(void);
void IIC_Stop(void);
bit IIC_WaitAck(void);
void IIC_SendAck(bit ackbit);
void IIC_SendByte(unsigned char byt);
unsigned char IIC_RecByte(void);
void IIC_write(uchar hw_address,uchar reg_address,uchar num);
uchar IIC_read(uchar hw_address,uchar reg_address);
#endif
onewire.c
#include "onewire.h"
//小数和负数显示温度
signed long rd_temperature(void)
{
unsigned char low,high;
float point;
signed long integer;
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0x44);
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0xbe);
low=Read_DS18B20();
high=Read_DS18B20();
if(((high>>4)&0x0f)!=0x0f)
{
integer=((low >>4)|(high<<4));
point=(((low&0x08)>>3)*0.5)+(((low&0x04)>>2)*0.25)+\
(((low&0x02)>>1)*0.125)+((low&0x01)*0.0625);
integer=(integer+point)*10000;
}
else
{
integer=((~(low >>4))|(~(high<<4)));
point=((((~low+1)&0x08)>>3)*0.5)+((((~low+1)&0x04)>>2)*0.25)+\
((((~low+1)&0x02)>>1)*0.125)+(((~low+1)&0x01)*0.0625);
integer=(integer+point)*10000;
integer=-integer;
}
return integer;
}
//
void Delay_OneWire(unsigned int t)
{
t=t*8;
while(t--);
}
//
void Write_DS18B20(unsigned char dat)
{
unsigned char i;
for(i=0;i<8;i++)
{
DQ = 0;
DQ = dat&0x01;
Delay_OneWire(5);
DQ = 1;
dat >>= 1;
}
Delay_OneWire(5);
}
//
unsigned char Read_DS18B20(void)
{
unsigned char i;
unsigned char dat;
for(i=0;i<8;i++)
{
DQ = 0;
dat >>= 1;
DQ = 1;
if(DQ)
{
dat |= 0x80;
}
Delay_OneWire(5);
}
return dat;
}
//
bit init_ds18b20(void)
{
bit initflag = 0;
DQ = 1;
Delay_OneWire(12);
DQ = 0;
Delay_OneWire(80);
DQ = 1;
Delay_OneWire(10);
initflag = DQ;
Delay_OneWire(5);
return initflag;
}
onewire.h
#ifndef __ONEWIRE_H
#define __ONEWIRE_H
#include <stc15f2k60s2.h>
sbit DQ = P1^4;
signed long rd_temperature(void); //; ;
void Delay_OneWire(unsigned int t);
unsigned char Read_DS18B20(void);
bit init_ds18b20(void);
void Write_DS18B20(unsigned char dat);
#endif