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Analysis of the problems of the 11th Blue Bridge Cup single chip microcomputer provincial competition
2022-07-03 07:35:00 【start field】
Recently, I have just finished writing the title of the 11th session , Let's see 2020 The title of the provincial competition in .
subject
The topic is still LED、 Nixie tube 、 Key three modules , And analog voltage input （ADC）、AT24C02（EEPROM）, Are common peripherals , And the question appeared before , So it's not hard , All the tests are basic skills .
1 The nixie tube shows
The nixie tube mainly displays the obtained voltage 、 There are three interfaces for counting and parameter setting , However, pay attention to the voltage data interface after power on .
2 LED
When the voltage is less than the set parameter 5s after L1 bright , This is still very easy to do . When the count is odd L2 bright , If you count , I first judge whether the voltage is larger or smaller than the parameter, and then judge whether the voltage is larger or smaller than the parameter after a period of time , If the results of the two comparisons are different, there is an intersection between the voltage and the parameters . Define a variable count, Every time the wrong key is pressed count++, When count>=3 when L3 bright , The right key makes count=0.
3 Key module
This time I use a matrix keyboard, which is different from the previous one .s12 It's the voltage 、 Switch between the three interfaces of counting and parameter setting ,s13 It is a key that can reset the count ,s16,s17 It's an addition and subtraction button, but please note that the range is [0,5].
4 ADC
Is to rewrite the underlying driver code （IIC）.
5 EEPROM
Is to rewrite the underlying driver code （IIC）, Pay attention to adding and subtracting parameters *10 Save to after EEPROM in , So after adding and subtracting, you can directly /10.0 such *10 It is also the original value , In addition, the specified storage address is 0.
IIC.c
#include"IIC.h"
#define DELAY_TIME 5
#define SlaveAddrW 0xA0
#define SlaveAddrR 0xA1
sbit SDA = P2^1;
sbit SCL = P2^0;
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);
}
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;
}
unsigned char Read_AD()
{
unsigned char temp;
IIC_Start();
IIC_SendByte(0x90);
IIC_WaitAck();
IIC_SendByte(0x03);
IIC_WaitAck();
IIC_Stop();
IIC_Start();
IIC_SendByte(0x91);
IIC_WaitAck();
temp=IIC_RecByte();
IIC_Stop();
return temp;
}
void write_eeprom(unsigned char add,unsigned char da)
{
IIC_Start();
IIC_SendByte(0xa0);
IIC_WaitAck();
IIC_SendByte(add);
IIC_WaitAck();
IIC_SendByte(da);
IIC_WaitAck();
IIC_Stop();
}
unsigned char Read_eeprom(unsigned char add)
{
unsigned char da;
IIC_Start();
IIC_SendByte(0xa0);
IIC_WaitAck();
IIC_SendByte(add);
IIC_WaitAck();
IIC_Stop();
IIC_Start();
IIC_SendByte(0xa1);
IIC_WaitAck();
da=IIC_RecByte();
IIC_Stop();
return da;
}IIC.h
#ifndef _IIC_H_
#define _IIC_H_
#include<stc15f2k60s2.h>
#include<intrins.h>
void IIC_Delay(unsigned char i);
void IIC_Start(void);
void IIC_Stop(void);
bit IIC_WaitAck(void);
void IIC_SendByte(unsigned char byt);
unsigned char IIC_RecByte(void);
unsigned char Read_AD();
void write_eeprom(unsigned char add,unsigned char da);
unsigned char Read_eeprom(unsigned char add);
#endifinit.c
#include"init.h"
#define u8 unsigned char
#define u16 unsigned int
#define state_0 0
#define state_1 1
#define state_2 2
#define key_io P3
extern u8 mode;
static u8 segaddr=0,key_press,key_state,key_num=0,row;
u8 value=0;
u8 code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff,0xc1,0x8c,0xc8};
u8 seg[]={11,11,11,11,11,11,11,11};
void all_init() // Turn off irrelevant peripherals
{
P2=(P2&0x1f)|0x80;P0=0xff;P2&=0x1f;
P2=(P2&0x1f)|0xa0;P04=0;P06=0;P2&=0x1f;
P2=(P2&0x1f)|0xc0;P0=0x00;P2&=0x1f;
P2=(P2&0x1f)|0xe0;P0=0xff;P2&=0x1f;
}
void display() // Nixie tube display function
{
P2=(P2&0x1f)|0xe0;P0=0xff;P2&=0x1f;
P2=(P2&0x1f)|0xc0;P0=1<<segaddr;P2&=0x1f;
if((mode==1||mode==2)&&segaddr==5) // Judge whether to use decimal point
{
P2=(P2&0x1f)|0xe0;P0=tab[seg[segaddr]]&0x7f;P2&=0x1f;
}
else
{
P2=(P2&0x1f)|0xe0;P0=tab[seg[segaddr]];P2&=0x1f;
}
if(++segaddr==8)segaddr=0;
}
u8 Read_key() // Matrix keyboard （ State machine ）
{
switch(key_state)
{
case state_0:
key_io=0x0f; P42=0; P44=0;
key_press =key_io;
if(key_press != 0x0f)
key_state = state_1;
break;
case state_1:
key_press =key_io;
if(key_press != 0x0f)
{
if((key_io&0x08)==0) row=4;
if((key_io&0x04)==0) row=5;
if((key_io&0x02)==0) row=6;
if((key_io&0x01)==0) row=7;
key_io=0xf0; P42=1;P44=1;
if(P44==0) key_num=row;
if(P42==0) key_num=row+4;
if((key_io&0x20)==0) key_num=row+8;
if((key_io&0x10)==0) key_num=row+12;
key_state = state_2;
}
else
key_state = state_0;
break;
case state_2:
key_io=0x0f; P42=0; P44=0;
key_press =key_io;
if(key_press == 0x0f) key_state = state_0;
break;
}
value=key_num;
key_num=0;
return value;
}
void Timer0Init(void)
{
AUXR |= 0x80;
TMOD &= 0xF0;
TL0 = 0xCD;
TH0 = 0xD4;
TF0 = 0;
TR0 = 1;
EA = 1;
ET0 = 1;
}
init.h
#ifndef _INIT_H_
#define _INIT_H_
#include<stc15f2k60s2.h>
void all_init();
void display();
unsigned char Read_key();
void Timer0Init(void);
#endifjm.c
#include"jm.h"
#include"IIC.h"
#define u8 unsigned char
#define u16 unsigned int
extern u8 mode,seg[],N,Y; // extern Indicates that this variable is defined elsewhere , To quote... Here
extern u16 RB2;
extern float V;
void Delay5ms()
{
unsigned char i, j;
i = 54;
j = 199;
do
{
while (--j);
} while (--i);
}
void jm12()
{
if(mode==1) // Voltage display interface
{
seg[0]=12;
seg[1]=11;
seg[2]=11;
seg[3]=11;
seg[4]=11;
seg[5]=RB2/100;
seg[6]=RB2/10%10;
seg[7]=RB2%10;
}
if(mode==2) // Parameter display interface
{
seg[0]=13;
seg[1]=11;
seg[2]=11;
seg[3]=11;
seg[4]=11;
seg[5]=Y/10;
seg[6]=Y%10;
seg[7]=0;
}
if(mode==3) // Counting display interface
{
seg[0]=14;
seg[1]=11;
seg[2]=11;
seg[3]=11;
seg[4]=11;
seg[5]=11;
seg[6]=N/10;
seg[7]=N%10;
}
}
void jm13() // Count reset interface
{
if(mode==3)
N=0;
}
void jm16()
{
if(mode==2)
{
Y+=5;
if(Y>=50)Y=0;
V=Y/10.0;
}
write_eeprom(0x00,V*10);
Delay5ms();
}
void jm17()
{
if(mode==2)
{
Y-=5;
if(Y<=0)Y=50;
V=Y/10.0;
}
write_eeprom(0x00,V*10);
Delay5ms();
}jm.h
#ifndef _JM_H_
#define _JM_H_
#include<stc15f2k60s2.h>
void jm12();
void jm13();
void jm16();
void jm17();
void Delay5ms();
#endifmain.c
#include"init.h"
#include"IIC.h"
#include"jm.h"
#define u8 unsigned char
#define u16 unsigned int
u8 num=0,mode=1,N=0,Y=30,count=0,e_count=0,high=0,low=0;
u16 RB2_count=0,RB2=0,L1_count=0,cp_count=0;
bit RB2_flag=0,L1_flag=0,e_flag=0,cp_flag=0,L1=0;
extern u8 seg[];
float V;
void LED();
void main()
{
all_init();
Timer0Init();
while(1)
{
num=Read_key();
switch(num)
{
case 12:
if(++mode==4)mode=1;
break;
case 13:
if(mode==3) // Determine whether the key is correct
{
jm13();
count=0;
}
else count++;
break;
case 16:
if(mode==2) // Determine whether the key is correct
{
jm16();
count=0;
}
else count++;
break;
case 17:
if(mode==2) // Determine whether the key is correct
{
jm17();
count=0;
}
else count++;
break;
}
jm12();
LED();
if(Y*10>=RB2) // Compare the voltage and parameters for the first time
high=1;
else if(Y*10<=RB2)
low=1;
if(cp_flag==1) //500ms Judge the voltage and parameters for the second time
{
cp_flag=0;
if(high+low==2)
{
N++;
high=0,low=0;
}
else
high=0,low=0;
}
if(RB2_flag==1)
{
RB2_flag=0;
RB2=Read_AD();
RB2=(RB2*100)/51.0+0.5;
}
if(RB2<Y*10)L1_flag=1; // Judge L1 Whether it is on
else
{
L1_flag=0;
L1=0;
}
if(e_flag==1)
{
e_flag=0;
V=Read_eeprom(0x00);
Y=V;
}
}
}
void LED()
{
u8 i=0xff;
if(L1==1)
{
P2=(P2&0x1f)|0x80;P0=i&0xfe;P2&=0x1f;
}
else
{
P2=(P2&0x1f)|0x80;P0=i|0x01;P2&=0x1f;
}
if(N%2!=0)
{
P2=(P2&0x1f)|0x80;P0=i&0xfd;P2&=0x1f;
}
else
{
P2=(P2&0x1f)|0x80;P0=i|0x02;P2&=0x1f;
}
if(count>=3)
{
P2=(P2&0x1f)|0x80;P0=i&0xfb;P2&=0x1f;
}
else
{
P2=(P2&0x1f)|0x80;P0=i|0x04;P2&=0x1f;
}
}
void Timer0() interrupt 1
{
display();
if(++RB2_count==100)
{
RB2_count=0;
RB2_flag=1;
}
if(L1_flag==1)
{
L1_count++;
if(L1_count==5000)
{
L1_count=0;
L1=1;
}
}
if(++e_count==200)
{
e_count=0;
e_flag=1;
}
if(high==1||low==1)
{
if(++cp_count==500)
{
cp_count=0;
cp_flag=1;
}
}
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