单片机硬件的使用时间限制的程序这里起抛砖引玉的作用相当于软件狗就是指定单片.. -

//2017.9.30 带狗测试。运行一段时间后停止运行
#include<reg52.h>
#include<intrins.h>
#include <stc15f102w.h>
typedef unsigned char BYTE;
typedef unsigned int WORD;
//定义端口
//sbit led = P3^4; //LED指示灯
sbit clk = P3^5; //IIC时钟
sbit dio = P3^4; //IIC数据
sbit key_add = P3^2; //加按键
sbit key_sub = P3^3;
sbit JSQ_Sig = P3^1; //计数器脉冲信号
sbit JSQ_Relay= P3^0; //计数器继电器返回信号计数器计数到0后返回信号给电路板
unsigned char number;
unsigned char qian,bai,shi,ge,count,dog,dog_sec,dog_min,dog_hour,dog_day;
unsigned char code xsbcdbuf[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77}; //共阳数码管
//测试地址
#define IAP_ADDRESS 0x0200
void Delay(BYTE n);
void IapIdle();
BYTE IapReadByte(WORD addr);
void IapProgramByte(WORD addr, BYTE dat);
void IapEraseSector(WORD addr);
///=======================================
void Delay_us(unsigned int i) //nus 延时
{
for(;i>0;i--)
_nop_();
}
///======================================
void I2CStart(void) //1637 开始
{
clk = 1;
dio = 1;
Delay_us(2);
dio = 0;
}
///=============================================
void I2Cask(void) //1637 应答
{
clk = 0;
Delay_us(5); //在第八个时钟下降沿之后延时 5us，开始判断 ACK 信号
while(dio);
clk = 1;
Delay_us(2);
clk=0;
}
///========================================
void I2CStop(void) // 1637 停止
{
clk = 0;
Delay_us(2);
dio = 0;
Delay_us(2);
clk = 1;
Delay_us(2);
dio = 1;
}
///=========================================
void I2CWrByte(unsigned char oneByte) //写一个字节
{
unsigned char i;
for(i=0;i<8;i++)
{
clk = 0;
if(oneByte&0x01) //低位在前
{
dio = 1;
}
else
{
dio = 0;
}
Delay_us(3);
oneByte=oneByte>>1;
clk=1;
Delay_us(3);
}
}
///================================================
unsigned char ScanKey(void) //按键检测程序
{
if(key_add == 0) //按键加
{
Delay_us(10);
if(key_add==0)
{
number = number+5;
IapEraseSector(IAP_ADDRESS);
IapProgramByte(IAP_ADDRESS,number);
while(!key_add); //等待按键松手
}
}
if(key_sub == 0) //按键减
{
Delay_us(10);
if(key_sub==0)
{
number = number-5;
IapEraseSector(IAP_ADDRESS);
IapProgramByte(IAP_ADDRESS,number);
while(!key_sub); //等待按键松手
}
}
}
///================================================
void jisuan()
{
qian = number/1000;
bai = number%1000/100;
shi = number%1000%100/10;
ge = number%10;
}
void SmgDisplay(void) //写显示寄存器
{
unsigned char i;
I2CStart();
I2CWrByte(0x40); // 40H 地址自动加 1 模式,44H 固定地址模式,本程序采用自加 1 模式
I2Cask();
I2CStop();
I2CStart();
I2CWrByte(0xc1);//设置首地址，
I2Cask();
for(i=0;i<6;i++)//地址自加，不必每次都写地址
{
I2CWrByte(xsbcdbuf[bai]); //送数据
I2Cask();
I2CWrByte(xsbcdbuf[shi]); //送数据
I2Cask();
I2CWrByte(xsbcdbuf[ge]); //送数据
I2Cask();
I2CWrByte(xsbcdbuf[1]); //送数据
I2Cask();
I2CWrByte(xsbcdbuf[0]); //送数据
I2Cask();
I2CWrByte(xsbcdbuf[qian]); //送数据
I2Cask();
}
I2CStop();
I2CStart();
I2CWrByte(0x8b); //开显示，八级亮度调制 88 89 8a 8b 8c 8d 8e 8f
I2Cask();
I2CStop();
}
///==============================================
void init() //定时器中断初始化
{
TMOD = 0x01; //set timer0 as mode1 (16-bit)
TL0 = (65536-50000)%256; //initial timer0 low byte
TH0 = (65536-50000)/256; //initial timer0 high byte
TR0 = 1; //timer0 start running
ET0 = 1; //enable timer0 interrupt
EA = 1; //open global interrupt switch
count = 0;
number = 200;
dog_sec = 0;
dog_min = 0;
dog_hour = 0;
}
///==============================================
void dog_test()
{
dog_sec++;
if(dog_sec == 60) //60s钟让狗加1
{
dog_sec = 0;
dog_min++;
if(dog_min ==60)
{
dog_min=0;
dog_hour++;
if(dog_hour ==24) //正常是24小时。测试时用1个小时算1天。
{
dog_hour=0;
dog_day++;
IapEraseSector(0x0000);
IapProgramByte(0x0000,dog_day);
}
}
}
}
void main(void)
{
unsigned char keydate;
init(); //初始化
dog_day = IapReadByte(0x0000);
number = IapReadByte(IAP_ADDRESS);
while(1)
{
jisuan();
SmgDisplay();
ScanKey();
if(count == 20) //脉冲信号来一次。计数器减1
{
count = 0;
number--;
IapEraseSector(IAP_ADDRESS);
IapProgramByte(IAP_ADDRESS,number);
dog_test();
if(number ==0)
{
number = 255;
}
}
while(dog_day>=1); //2天后停止运行。实际上是2个小时。测试用小时代替天。
}
}
//===========end==================================
/* Timer0 interrupt routine */
void tm0_isr() interrupt 1 using 1
{
TL0 = (65536-50000)%256; //reload timer0 low byte
TH0 = (65536-50000)/256; //reload timer0 high byte
count++;dog++;
}
/*----------------------------
软件延时
----------------------------*/
void Delay(BYTE n)
{
WORD x;
while (n--)
{
x = 0;
while (++x);
}
}
/*----------------------------
关闭IAP
----------------------------*/
void IapIdle()
{
IAP_CONTR = 0; //关闭IAP功能
IAP_CMD = 0; //清除命令寄存器
IAP_TRIG = 0; //清除触发寄存器
IAP_ADDRH = 0x80; //将地址设置到非IAP区域
IAP_ADDRL = 0;
}
/*----------------------------
从ISP/IAP/EEPROM区域读取一字节
----------------------------*/
BYTE IapReadByte(WORD addr)
{
BYTE dat; //数据缓冲区
IAP_CONTR = ENABLE_IAP; //使能IAP
IAP_CMD = CMD_READ; //设置IAP命令
IAP_ADDRL = addr; //设置IAP低地址
IAP_ADDRH = addr >> 8; //设置IAP高地址
IAP_TRIG = 0x5a; //写触发命令(0x5a)
IAP_TRIG = 0xa5; //写触发命令(0xa5)
_nop_(); //等待ISP/IAP/EEPROM操作完成
dat = IAP_DATA; //读ISP/IAP/EEPROM数据
IapIdle(); //关闭IAP功能
return dat; //返回
}
/*----------------------------
写一字节数据到ISP/IAP/EEPROM区域
----------------------------*/
void IapProgramByte(WORD addr, BYTE dat)
{
IAP_CONTR = ENABLE_IAP; //使能IAP
IAP_CMD = CMD_PROGRAM; //设置IAP命令
IAP_ADDRL = addr; //设置IAP低地址
IAP_ADDRH = addr >> 8; //设置IAP高地址
IAP_DATA = dat; //写ISP/IAP/EEPROM数据
IAP_TRIG = 0x5a; //写触发命令(0x5a)
IAP_TRIG = 0xa5; //写触发命令(0xa5)
_nop_(); //等待ISP/IAP/EEPROM操作完成
IapIdle();
}
/*----------------------------
扇区擦除
----------------------------*/
void IapEraseSector(WORD addr)
{
IAP_CONTR = ENABLE_IAP; //使能IAP
IAP_CMD = CMD_ERASE; //设置IAP命令
IAP_ADDRL = addr; //设置IAP低地址
IAP_ADDRH = addr >> 8; //设置IAP高地址
IAP_TRIG = 0x5a; //写触发命令(0x5a)
IAP_TRIG = 0xa5; //写触发命令(0xa5)
_nop_(); //等待ISP/IAP/EEPROM操作完成
IapIdle();
}

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