我要评论蓝桥杯—第八届省赛试题-电子钟程序设计
题目：
思路
1.显示温度使用大赛提供的onewire.c，只需自己添加读取函数。
2.设计时钟程序，或者使用DS1302.c（这里使用的是自己写的函数）
3.键扫描函数
4.进行逻辑判断，都是if语句。哪个按键和模式同时满足，执行相应的操作。
代码中注释很清楚相信大家能看懂
main.c
#include <stc15f2k60s2.h>
#include <onewire.h>
#define uchar unsigned char
#define uint unsigned int
code unsigned char tab[] = { 0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90, 0xff, 0xbf };
uchar dspbuf[8] = { 10, 10, 10, 10, 10, 10, 10, 10 };
uchar temper_flag = 0; //温度扫描标志位
uchar hour, minute, sec, alarmHour, alarmMinute, alarmSec; //时分秒 闹钟的时分秒
uint count = 0, miao = 0; //count == 25则为5秒， miao == 200 0.2秒
uchar temperature, key_value; //温度数值 ；键扫描返回值
uchar mode = 0; //模式
uchar tt = 0; //显示转变温度的标志
uchar tn = 0; //时钟和闹钟转换的标志位
uchar ledshan = 0, ledflag = 0; //时钟 == 闹钟，led闪烁
void display();
void init();
unsigned char read_key();
void load();
void tempera();
//关闭蜂鸣器和LED灯
void cls_buzz()
{
P2 = (P2 & 0x1f) | 0xa0;
P0 = 0x00;
P2 = 0x1f;
}
void cls_led()
{
P2 = (P2 & 0x1f) | 0x80;
P0 = 0xff;
P2 = 0x1f;
}
//主函数
void main()
{
cls_buzz();
cls_led();
AUXR = 0x80;
TMOD = 0xf0;
TL0 = 0xcd;
TH0 = 0xd4;
TF0 = 0;
TR0 = 1;
ET0 = 1;
EA = 1;
init();
while (1)
{
if (temper_flag)
{
temper_flag = 0;
temperature = rd_temperature(); //读温度
}
key_value = read_key();
}
}
//温度赋值函数
void tempera()
{
uchar i;
for (i = 0; i < 6; i++)
dspbuf[i] = 10;
dspbuf[7] = temperature % 10;
dspbuf[6] = (temperature - dspbuf[7]) / 10;
}
void time0(void) interrupt 1
{
static unsigned char intr;
if (++intr == 10) //1ms执行一次
{
intr = 0;
temper_flag = 1; //10ms温度读取标志位置1
}
if (count == 1000) //1s
{
sec++;
count = 0;
miao = (miao + 1) % 2;
}
count += 1;
//时钟时间限制条件
if (sec == 60) {
sec = 0;
minute += 1;
}
if (minute == 60) {
minute = 0;
hour += 1;
}
if (hour == 24) {
hour = 0;
}
//闹钟时间限制条件
if (alarmSec == 60) {
alarmSec = 0;
alarmMinute += 1;
}
if (alarmMinute == 60) {
alarmMinute = 0;
alarmHour += 1;
}
if (alarmHour == 24) {
alarmHour = 0;
}
if (ledshan == 200)
{
ledshan = 0;
ledflag = (ledflag + 1) % 2;
}
ledshan += 1;
display();
}
void load()
{
if (key_value == 7) {
mode += 1;
}
if (tt == 0) {
if (tn == 0)
{
//模式1段码值赋值
if (mode == 1)
{
dspbuf[2] = dspbuf[5] = 11;
dspbuf[1] = hour % 10;
dspbuf[0] = hour / 10;
dspbuf[4] = minute % 10;
dspbuf[3] = minute / 10;
if (miao == 1)
dspbuf[6] = dspbuf[7] = 10;
else
{
dspbuf[7] = sec % 10;
dspbuf[6] = sec / 10;
}
}
if (mode == 2)
{
dspbuf[2] = dspbuf[5] = 11;
dspbuf[1] = hour % 10;
dspbuf[0] = hour / 10;
dspbuf[7] = sec % 10;
dspbuf[6] = sec / 10;
if (miao == 1)
dspbuf[3] = dspbuf[4] = 10;
else
{
dspbuf[4] = minute % 10;
dspbuf[3] = minute / 10;
}
}
if (mode == 3)
{
dspbuf[2] = dspbuf[5] = 11;
dspbuf[4] = minute % 10;
dspbuf[3] = minute / 10;
dspbuf[7] = sec % 10;
dspbuf[6] = sec / 10;
if (miao == 1)
dspbuf[1] = dspbuf[0] = 10;
else
{
dspbuf[1] = hour % 10;
dspbuf[0] = hour / 10;
}
}
//时钟+设置
if (key_value == 4 && mode == 1)
{
key_value = 0;
sec += 1;
}
if (key_value == 4 && mode == 2)
{
key_value = 0;
minute++;
}
if (key_value == 4 && mode == 3)
{
key_value = 0;
hour += 1;
}
//时钟-设置
if (key_value == 5 && mode == 1)
{
key_value = 0;
if (sec == 0)
sec = 59;
else
sec -= 1;
}
if (key_value == 5 && mode == 2)
{
key_value = 0;
if (minute == 0)
minute = 59;
else
minute--;
}
if (key_value == 5 && mode == 3)
{
key_value = 0;
if (hour == 0)
hour = 23;
else
hour -= 1;
}
if (mode == 0) {
dspbuf[2] = dspbuf[5] = 11;
dspbuf[1] = hour % 10;
dspbuf[0] = hour / 10;
dspbuf[4] = minute % 10;
dspbuf[3] = minute / 10;
dspbuf[7] = sec % 10;
dspbuf[6] = sec / 10;
}
}
if (tn == 1) //时钟转闹钟标志位
{
if (mode == 1)
{
dspbuf[2] = dspbuf[5] = 11;
dspbuf[1] = alarmHour % 10;
dspbuf[0] = alarmHour / 10;
dspbuf[4] = alarmMinute % 10;
dspbuf[3] = alarmMinute / 10;
if (miao == 1)
dspbuf[6] = dspbuf[7] = 10;
else
{
dspbuf[7] = alarmSec % 10;
dspbuf[6] = alarmSec / 10;
}
}
if (mode == 2)
{
dspbuf[2] = dspbuf[5] = 11;
dspbuf[1] = alarmHour % 10;
dspbuf[0] = alarmHour / 10;
dspbuf[7] = alarmSec % 10;
dspbuf[6] = alarmSec / 10;
if (miao == 1)
dspbuf[3] = dspbuf[4] = 10;
else
{
dspbuf[4] = alarmMinute % 10;
dspbuf[3] = alarmMinute / 10;
}
}
if (mode == 3)
{
dspbuf[2] = dspbuf[5] = 11;
dspbuf[4] = alarmMinute % 10;
dspbuf[3] = alarmMinute / 10;
dspbuf[7] = alarmSec % 10;
dspbuf[6] = alarmSec / 10;
if (miao == 1)
dspbuf[1] = dspbuf[0] = 10;
else
{
dspbuf[1] = alarmHour % 10;
dspbuf[0] = alarmHour / 10;
}
}
if (key_value == 4 && mode == 1)
{
key_value = 0;
alarmSec += 1;
}
if (key_value == 4 && mode == 2)
{
key_value = 0;
alarmMinute++;
}
if (key_value == 4 && mode == 3)
{
key_value = 0;
alarmHour += 1;
}
if (key_value == 5 && mode == 1)
{
key_value = 0;
if (alarmSec == 0)
alarmSec = 59;
else
alarmSec -= 1;
}
if (key_value == 5 && mode == 2)
{
key_value = 0;
if (alarmMinute == 0)
alarmMinute = 59;
else
alarmMinute--;
}
if (key_value == 5 && mode == 3)
{
key_value = 0;
if (alarmHour == 0)
alarmHour = 23;
else
alarmHour -= 1;
}
if (mode == 0) {
dspbuf[2] = dspbuf[5] = 11;
dspbuf[1] = alarmHour % 10;
dspbuf[0] = alarmHour / 10;
dspbuf[4] = alarmMinute % 10;
dspbuf[3] = alarmMinute / 10;
dspbuf[7] = alarmSec % 10;
dspbuf[6] = alarmSec / 10;
}
}
if (hour == alarmHour && minute == alarmMinute && sec <= (alarmSec + 4)) //到达闹钟时间led闪烁五秒
{
if (ledflag == 1) // == 1 L1亮
{
P2 = (P2 & 0x1f) | 0x80;
P0 = 0xfe;
P2 = 0x1f;
}
else
{
P2 = (P2 & 0x1f) | 0x80;
P0 = 0xff;
P2 = 0x1f;
}
}
else
{
P2 = (P2 & 0x1f) | 0x80;
P0 = 0xff;
P2 = 0x1f;
}
}
else if (mode == 0 && key_value == 4 && tt == 1) //条件满足显示温度
{
tempera();
}
if (mode > 3) mode = 0; //模式转换
}
void init() //初始赋值 时分秒 闹钟时分秒
{
hour = 23;
minute = 59;
sec = 50;
alarmHour = 0;
alarmMinute = 0;
alarmSec = 0;
}
//键扫描
unsigned char read_key(void)
{ //state0：充当消抖 state1：有按键按下 state2：检查按键是否松开
uchar temp;
static unsigned char state = 0;
uchar key_value = 0;
temp = P3 & 0x0f;
switch (state)
{
case 0:
{
if (P3 != 0x0f) //有按键按下
state = 1;
}break;
case 1:
{
if (P3 != 0x0f) {
switch (temp)
{
case 0x0e:
{
key_value = 7; state = 2; //S7
}break;
case 0x0d:
{
key_value = 6; state = 2; //S6
tn = (tn + 1) % 2;
}break;
case 0x0b:
{
key_value = 5; state = 2; //S5
}break;
case 0x07:
{
key_value = 4; state = 2; //S4
if(mode == 0)
tt = 1;
}break;
}
}
else
state = 0;
}break;
case 2:
{
if (P3 == 0xff)
{
tt = 0;
state = 0;
key_value = 0;
}
}break;
}
return key_value;
}
//显示函数
void display()
{
static unsigned char dspcom = 0;
load();
P2 = (P2 & 0x1f) | 0xe0; //消影
P0 = 0xff;
P2 = 0x1f;
P2 = (P2 & 0x1f) | 0xc0; //位选
P0 = 1 << dspcom;
P2 = 0x1f;
P2 = (P2 & 0x1f) | 0xe0; //显示
P0 = tab[dspbuf[dspcom]];
P2 = 0x1f;
if (++dspcom == 8) dspcom = 0;
}
onewire.h
#include "reg52.h"
sbit DQ = P1^4; //单总线接口
//单总线延时函数
void Delay_OneWire(unsigned int t)
{
unsigned char i;
while(t--){
for(i=0;i<12;i++);
}
}
//通过单总线向DS18B20写一个字节
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);
}
//从DS18B20读取一个字节
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;
}
//DS18B20设备初始化
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;
}
unsigned char rd_temperature(void)
{
unsigned char high,low;
char temp;
init_ds18b20();
Write_DS18B20(0xCC);
Write_DS18B20(0x44); //启动温度转换
Delay_OneWire(200);
init_ds18b20();
Write_DS18B20(0xCC);
Write_DS18B20(0xBE); //读取寄存器
low = Read_DS18B20(); //低字节
high = Read_DS18B20(); //高字节
temp = high<<4; //只取了整数部分和符号位
temp |= (low>>4);
return temp;
}
感谢丁莉老师的指导！！！
本文地址：https://blog.csdn.net/qq_43710889/article/details/108589745
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