《蓝桥杯真题》:2021单片机省赛第一场(第十二 / 12届第一场)(另一种代码风格)
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2021单片机省赛第一场
有关题目
实现代码
注意:
代码实现方面
:
①注意控制温度参数temp_para范围
②DAC输出时,注意写入的数字IIC_SendByte(temp)中temp范围在0~255;
源文件修改方面
:
①官方给的iic.h中使用的时C51的头文件"reg52.h",我们需要修改为对应的15系列头文件"STC15F2K60S2.h",这样才可以使用其中的一些特殊位寄存器
②注意修改驱动代码时要留意一下onewire.h中单总线延时函数,是STC89C52RC
,还是15系列
的,15系列的单片机速度比51快8~12倍,需要修改对应的延时函数
。如下
//单总线内部延时函数
void Delay_OneWire(unsigned int t)
char i;
while(t–)
for (i = 0; i < 12; i++);
①main.c
#include "STC15F2K60S2.h"
#include "onewire.h"
#include "iic.h"
#define uchar unsigned char
#define uint unsigned int
sbit L1 = P0^0;
sbit L2 = P0^1;
sbit L3 = P0^2;
sbit L4 = P0^3;
uchar jm = 0;
code uchar tab[] = 0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0xff, 0xc6, 0x8c, 0x88;
//c p A 11 12 13
bit flag_mod;
uchar temp_para = 25;//温度参数
float curr_temp, Vdac;//当前温度,DAC输出电压
void sys_init();
float rd_temp();
void dac_pcf8591(uchar da);
void key_handle();
void mod_handle();
void led();
void dsp_smg_bit(uchar pos, val, dot);//dot = 1,添加小数点
void display();//显示功能,分三个大块
void dsp_temp();
void dsp_para();
void dsp_dac();
void Delay1ms() ; //1ms@12.000MHz,延时1ms用于给足数码管足够显示时间
void delay_k(uchar t);//延时t * 10us
void main()
sys_init();
while(1)
curr_temp = rd_temp();
key_handle();
mod_handle();
display();
dac_pcf8591((uchar)(Vdac * 51));
led();
void mod_handle()
if (!flag_mod)
if (curr_temp < temp_para)
Vdac = 0.0;
else
Vdac = 5.0;
else
if (curr_temp <= 20)
Vdac = 1.0;
else if (curr_temp >= 40)
Vdac = 4.0;
else
Vdac = 0.15 * curr_temp - 2;
void led()
if (!flag_mod)
P2 = (P2 & 0x1f) | 0x80;
L1 = 0;
if (0 == jm)
P2 = (P2 & 0x1f) | 0x80;
L2 = 0;
else if (1 == jm)
P2 = (P2 & 0x1f) | 0x80;
L3 = 0;
else if (2 == jm)
P2 = (P2 & 0x1f) | 0x80;
L4 = 0;
void key_handle()
P44 = P42 = P33 = 1;
P32 = 0;
if (!P44)//s5 模式切换
delay_k(15);
if (!P44)
flag_mod = !flag_mod;
while(!P44)
display();
if (!P42)//s9 +
delay_k(15);
if (!P42)
if (1 == jm)
if (++temp_para > 99)
temp_para = 99;
while(!P42)
display();
P44 = P42 = P32 = 1;
P33 = 0;
if (!P44)//s4 界面调整
delay_k(15);
if (!P44)
if (++jm >= 3)
jm = 0;
while(!P44)
display();
if (!P42)//s8 -
delay_k(15);
if (!P42)
if (1 == jm)
if (--temp_para < 10)
temp_para = 10;
while(!P42)
display();
void dsp_dac()
uint x = (uint)(Vdac * 100);
dsp_smg_bit(1, 13, 0);
dsp_smg_bit(6, x / 100 % 10, 1);
dsp_smg_bit(7, x / 10 % 10, 0);
dsp_smg_bit(8, x % 10, 0);
void dsp_para()
dsp_smg_bit(1, 12, 0);
dsp_smg_bit(7, temp_para / 10 % 10, 0);
dsp_smg_bit(8, temp_para % 10, 0);
void dsp_temp()
uint x = (uint)(curr_temp * 100);
if (x != 8500)
dsp_smg_bit(1, 11, 0);
dsp_smg_bit(5, x / 1000 % 10, 0);
dsp_smg_bit(6, x / 100 % 10, 1);
dsp_smg_bit(7, x / 10 % 10, 0);
dsp_smg_bit(8, x % 10, 0);
void display()
if (0 == jm)
dsp_temp();
else if (1 == jm)
dsp_para();
else if (2 == jm)
dsp_dac();
void dsp_smg_bit (uchar pos, val, dot)
P2 = (P2 & 0x1f) | 0xc0;
P0 = 1 << (pos - 1);
P2 = (P2 & 0x1f) | 0xe0;
if (!dot)
P0 = tab[val];
else
P0 = tab[val] & 0x7f;
Delay1ms();
P0 = 0xff;
P2 &= 0x1f;
void Delay1ms() //@12.000MHz
unsigned char i, j;
i = 12;
j = 169;
do
while (--j);
while (--i);
void delay_k(uchar t)
while(t--)
display();
void dac_pcf8591(uchar da)
IIC_Start();
IIC_SendByte(0x90);
IIC_WaitAck();
IIC_SendByte(0x40);
IIC_WaitAck();
IIC_SendByte(da);
IIC_WaitAck();
IIC_Stop();
float rd_temp()
uchar l, h;
uint temp;
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0x44);
init_ds18b20();//
Write_DS18B20(0xcc);
Write_DS18B20(0xbe);
l = Read_DS18B20();
h = Read_DS18B20();
temp = (h & 0x0f);
temp <<= 8;
temp |= l;
return (float)(temp * 0.0625);
void sys_init()
P2 = (P2 & 0x1f) | 0xa0;
P0 = 0xaf;
P2 = (P2 & 0x1f) | 0x80;
P0 = 0xff;
P2 &= 0x1f;
②main.c
#include "STC15F2K60S2.h"
#include "iic.h"
#include "onewire.h"
#define uchar unsigned char
#define uint unsigned int
sbit L1 = P0^0;
sbit L2 = P0^1;
sbit L3 = P0^2;
sbit L4 = P0^3;
uchar jm = 0;//界面初始化温度界面
code uchar tab[] = 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff, 0xc6, 0x8c, 0x88;
//C P A 11 12 13
bit mod_flag;//0为模式1,1为模式2;
char temp_para = 25;//温度参数
float curr_temp, Vdac;//当前温度,DAC输出电压
void sys_init();
float rd_temperature();
void key_handle();
void dac_pcf8591(uchar da);
void led();
void dsp_smg_bit(uchar pos, val, sta);//sta = 1,添加小数点
void display();//显示功能,分三个大块
void dsp_temp();
void dsp_para();
void dsp_dac();
void delay_k(uchar t);//延时t * 10us
void Delay1ms(); //1ms@12.000MHz,延时1ms用于给足数码管足够显示时间
void main()
sys_init();
while(1)
curr_temp = rd_temperature();
key_handle();
display();
led();
void led()
if (!mod_flag)
P2 = (P2 & 0x1f) | 0x80;
L1 = 0;
if (0 == jm)
P2 = (P2 & 0x1f) | 0x80;
L2 = 0;
else if (1 == jm)
P2 = (P2 & 0x1f) | 0x80;
L3 = 0;
else if (2 == jm)
P2 = (P2 & 0x1f) | 0x80;
L4 = 0;
void key_handle()
P44 = P42 = P33 = 1;
P32 = 0;
if (!P44)//s5--模式切换
delay_k(15);
if (!P44)
while(!P44)
display();
mod_flag = !mod_flag;
if (!mod_flag)
if (curr_temp * 10 < temp_para * 10)
Vdac = 0.0;
else
Vdac = 5.0;
else
if (curr_temp * 10 < 200)
Vdac = 1.0;
else if (curr_temp * 10 > 400)
Vdac = 4.0;
else
Vdac = 0.15 * curr_temp - 2;
dac_pcf8591((uchar)(Vdac * 51));//注意写入pcf8591时范围
if (!P42)//s9 +
delay_k(15);
if (!P42)
while(!P42)
display();
if (1 == jm)
if (++temp_para > 99)
temp_para = 99;
P44 = P42 = P32 = 1;
P33 = 0;
if (!P44)//s4 jm
delay_k(15);
if (!P44)
while(!P44)
display();
if (++jm >= 3)
jm = 0;
if (!P42)//s8 -
delay_k(15);
if (!P42)
while(!P42)
display();
if (1 == jm)
if (--temp_para < 0)
temp_para = 0;
void display()
if (0 == jm)
dsp_temp();
else if (1 == jm)
dsp_para();
else if (2 == jm)
dsp_dac();
void dsp_dac()
uint x = (uint) (Vdac * 100);
dsp_smg_bit(1, 13, 0);
dsp_smg_bit(6, x / 100 % 10, 《蓝桥杯真题》:2021单片机省赛第一场(第十二 / 12届第一场)(另一种代码风格)
第十二届蓝桥杯省赛第一场C++ A/B/C组 真题题解(详细讲解 + 代码分析)看这篇就够了~~~~
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