蓝桥杯单片机刷题——E2PROM记录开机次数

设计要求

使用E2PROM完成数据记录功能，单片机复位次数记录到E2PROM的地址0中。每复位一次数值加1，按下按键S4，串口发送复位次数。串口发送格式如下：

Number：1

备注：

单片机IRC振荡器频率设置为12MHz。

按键模式：BTN；扩展方式：IO模式。

串口通信波特率设置为 9600。

代码：

sys.h

#ifndef __SYS_H__
#define __SYS_H__

#include <STC15F2K60S2.H>
#include "intrins.h"
sbit scl=P2^0;
sbit sda=P2^1;
extern bit flag_send;//用于标明是否发送数据
extern bit flag_set;//用于标明是否重置数据（非题意）
void init74hc138(unsigned char n);
void init();
void w_eeprom(unsigned char addr,unsigned char date);
unsigned char r_eeprom(unsigned char addr);
void Key_Loop();

#endif

main.c

#include "sys.h"
unsigned char eeprom_count=0;//EEPROM中的计数值
unsigned char *str = "Number: ";
bit flag_key=0;
void UartInit(void)		//[email protected]
{
	SCON = 0x50;		//8位数据,可变波特率
	AUXR |= 0x40;		//定时器时钟1T模式
	AUXR &= 0xFE;		//串口1选择定时器1为波特率发生器
	TMOD &= 0x0F;		//设置定时器模式
	TL1 = 0xC7;			//设置定时初始值
	TH1 = 0xFE;			//设置定时初始值
	ET1 = 0;			//禁止定时器中断
	TR1 = 1;			//定时器1开始计时
	ES=1;
	EA=1;
}
//发送一个字节数据到串口
void send_uart_date(unsigned char date){
	SBUF=date;
	while(TI==0);
	TI=0;
}
//发送字符串到串口
void send_uart_str(unsigned char *str){
	while(*str!='\0'){
		send_uart_date(*str++);
	}
}
//将数字转换为字符串
void num_transt_str(unsigned char num){
	if(num>=100)send_uart_date(num/100+'0');
	if(num>=10)send_uart_date((num%100)/10+'0');
	send_uart_date(num%10+'0');
}
void Timer0_Init(void)		//100微秒@12.000MHz
{
	AUXR |= 0x80;			//定时器时钟1T模式
	TMOD &= 0xF0;			//设置定时器模式
	TL0 = 0x50;				//设置定时初始值
	TH0 = 0xFB;				//设置定时初始值
	TF0 = 0;				//清除TF0标志
	TR0 = 1;				//定时器0开始计时
	ET0 = 1;				//使能定时器0中断
	EA=1;
}
void main(){
	init();
	eeprom_count=r_eeprom(0x00);
	eeprom_count++;
	w_eeprom(0x00,eeprom_count);
	UartInit();
	Timer0_Init();
	while(1){
		if(flag_key){
			flag_key=0;
			Key_Loop();
		}
		if(flag_send){
			flag_send=0;
			send_uart_str(str);//发送Number:
			num_transt_str(eeprom_count);//发送计数器数值
			send_uart_str("\r\n");//换行
		}
		if(flag_set){//重置
			flag_set=0;
			eeprom_count=0;
			w_eeprom(0x00,eeprom_count);
		}
	}
}
void uart() interrupt 4
{
	if(RI){
		RI=0;
	}
}
void Timer0_Isr(void) interrupt 1
{
	static unsigned char count=0;
	count++;
	if(count==50){
		count=0;
		flag_key=1;
	}
}

sys.c

#include "sys.h"
unsigned char keyval,keyold,keydown,keyup;
bit flag_send=0;
bit flag_set=0;
void init74hc138(unsigned char n){
	P2=(P2&0x1f)|(n<<5);
	P2&=0x1f;
}
void init(){
	P0=0x00;
	init74hc138(5);
	P0=0xff;
	init74hc138(4);
}
void Key_Loop(){
	keyval=0;
	if(P33==0)keyval=1;
	if(P32==0)keyval=2;
	keydown=keyval&(keyold^keyval);
	keyup=~keyval&(keyold^keyval);
	if(keyval==1&&keyold!=keyval)flag_send=1;
	if(keyval==2&&keyold!=keyval)flag_set=1;
	keyold=keyval;
}

iic.c

#include "sys.h"

#define DELAY_TIME	5
static void I2C_Delay(unsigned char n)
{
    do
    {
        _nop_();_nop_();_nop_();_nop_();_nop_();
        _nop_();_nop_();_nop_();_nop_();_nop_();
        _nop_();_nop_();_nop_();_nop_();_nop_();		
    }
    while(n--);      	
}
void I2CStart(void)
{
    sda = 1;
    scl = 1;
	I2C_Delay(DELAY_TIME);
    sda = 0;
	I2C_Delay(DELAY_TIME);
    scl = 0;    
}
void I2CStop(void)
{
    sda = 0;
    scl = 1;
	I2C_Delay(DELAY_TIME);
    sda = 1;
	I2C_Delay(DELAY_TIME);
}
void I2CSendByte(unsigned char byt)
{
    unsigned char i;
	
    for(i=0; i<8; i++){
        scl = 0;
		I2C_Delay(DELAY_TIME);
        if(byt & 0x80){
            sda = 1;
        }
        else{
            sda = 0;
        }
		I2C_Delay(DELAY_TIME);
        scl = 1;
        byt <<= 1;
		I2C_Delay(DELAY_TIME);
    }
	
    scl = 0;  
}
unsigned char I2CReceiveByte(void)
{
	unsigned char da;
	unsigned char i;
	for(i=0;i<8;i++){   
		scl = 1;
		I2C_Delay(DELAY_TIME);
		da <<= 1;
		if(sda) 
			da |= 0x01;
		scl = 0;
		I2C_Delay(DELAY_TIME);
	}
	return da;    
}
unsigned char I2CWaitAck(void)
{
	unsigned char ackbit;
	
    scl = 1;
	I2C_Delay(DELAY_TIME);
    ackbit = sda; 
    scl = 0;
	I2C_Delay(DELAY_TIME);
	
	return ackbit;
}
void I2CSendAck(unsigned char ackbit)
{
    scl = 0;
    sda = ackbit; 
	I2C_Delay(DELAY_TIME);
    scl = 1;
	I2C_Delay(DELAY_TIME);
    scl = 0; 
	sda = 1;
	I2C_Delay(DELAY_TIME);
}
//向EEPROM中写入一个字节数据
void w_eeprom(unsigned char addr,unsigned char date){
	I2CStart();
	I2CSendByte(0xa0);
	I2CWaitAck();
	I2CSendByte(addr);
	I2CWaitAck();
	I2CSendByte(date);
	I2CWaitAck();
	I2CStop();
}
//从EEPROM中读取一个字节数据
unsigned char r_eeprom(unsigned char addr){
	unsigned char temp;
	I2CStart();
	I2CSendByte(0xa0);
	I2CWaitAck();
	I2CSendByte(addr);
	I2CWaitAck();
	
	I2CStart();
	I2CSendByte(0xa1);
	I2CWaitAck();
	temp=I2CReceiveByte();
	I2CSendAck(1);
	I2CStop();
	return temp;
}

测试结果