【1】Title requirements
Create a new project, write code in I/O mode , and implement the following functions on the CT107D MCU comprehensive training platform:
1. After the system is powered on, turn off the buzzer and relay , turn off all indicator lights , turn off all digital tubes , and then enter the cycle of light flashing and digital tube counting.
2. As shown in the figure below: the rightmost two digits of the digital tube display the number of flashes of the L8 indicator ; the leftmost one displays the simultaneous flip times of the L1 and L2 indicators .
3. Cyclic realization of light flashing and digital tube counting: L8 indicator light flashes cyclically, every time L8 flashes once , the two digits on the far right of the digital tube add 1 , and the maximum value is 99. After the maximum value is exceeded, it returns to 00 and continues to count; L8 indicates Each time the light flashes once, the L1 and L2 indicator lights turn over the current switch state at the same time, the leftmost bit of the data tube increases by 1 , and the maximum value is 9. After the maximum value is exceeded, it returns to 0 and continues to count.
4. In the process of light flickering and digital tube counting working at the same time, it is necessary to control the 138 decoder and the 573 latch, and cooperate with the two to run at the same time to avoid conflicting equipment, display garbled characters, and refresh intermittently.
[2] Source code reference
/*==================蓝桥杯单片机特训==================
【进阶01】：灯光闪烁与数码管计数
**平 台：CT107D单片机综合实训平台
**模 式：IO模式
**设 计：欧浩源（小蜜蜂老师，[email protected]）
**时 间：2022-03-31
**更多详见：www.xmf393.com
====================================================*/
#include "reg52.h"
//定义动态显示中单个数码管点亮时长
#define TSMG 500
//-------共阳数码管的段码编码表（无小数点）--------
//0 1 2 3 4 5 6 7 8 9 A b C D E F - .
unsigned char code SMG_NoDot[18]={0xc0,0xf9,
0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
0x88,0x83,0xc6,0xc0,0x86,0x8e,0xbf,0x7f};
unsigned char stat_led = 0xff; //定义LED灯当前状态
unsigned char num1 = 0, num2 = 0; //定义计数变量
void Display_Num(); //声明数码管显示函数
//====================普通延时函数====================
void Delay(unsigned int t)
{
while(t--)
{
Display_Num(); //延时期间保持数码管刷新
}
}
//==============数码管动态显示专用延时函数=============
void DelaySMG(unsigned int t)
{
while(t--);
}
//==================设置选通的锁存器===================
void Set_HC573(unsigned char channel, unsigned char dat)
{
P0 = dat; //待设置数据
switch(channel) //选通锁存器
{
case 4:
P2 = (P2 & 0x1f) | 0x80; //Y4输出0，LED控制
break;
case 5:
P2 = (P2 & 0x1f) | 0xa0; //Y5输出0，蜂鸣器和继电器控制
break;
case 6:
P2 = (P2 & 0x1f) | 0xc0; //Y6输出0，数码管位选
break;
case 7:
P2 = (P2 & 0x1f) | 0xe0; //Y7输出0，数码管段码
break;
case 0:
P2 = (P2 & 0x1f) | 0x00; //所有锁存器不选择
break;
}
P2 = (P2 & 0x1f) | 0x00; //设置完成，关闭全部锁存器
}
//=================单个数码管动态显示=================
void DisplaySMG_Bit(unsigned char pos, unsigned char value)
{
Set_HC573(6, 0x01 << pos); //数码管的段位
Set_HC573(7, value); //数码管显示内容
DelaySMG(TSMG); //数码管点亮时长
Set_HC573(6, 0x01 << pos);
Set_HC573(7, 0xff); //消隐
}
//=================全部数码管静态显示=================
void DisplaySMG_All(unsigned char value)
{
Set_HC573(6, 0xff); //使能所有数码管
Set_HC573(7, value); //数码管显示内容
}//===================计数值显示函数===================
void Display_Num()
{
//数码管右起第0位
DisplaySMG_Bit(7,SMG_NoDot[num1 % 10]);
//数码管右起第1位
DisplaySMG_Bit(6,SMG_NoDot[num1 / 10]);
//数码管由起第7位
DisplaySMG_Bit(0,SMG_NoDot[num2]);
}
//====================灯光闪烁控制====================
void LED_Control()
{
stat_led &= ~0x80;
Set_HC573(4, stat_led); //L8灯点亮
Delay(200); //延时
stat_led |= 0x80;
Set_HC573(4, stat_led); //L8灯熄灭
Delay(200); //延时
num1++; //L8闪烁累加
if(num1 == 100) //达到最大值时恢复0
{
num1 = 0;
}
//L1灯和L2灯同时翻转当前的工作状态
if((stat_led & 0x03) == 0x03)
{
stat_led &= ~0x03;
}
else
{
stat_led |= 0x03;
}
Set_HC573(4, stat_led);
num2++; //L1和L2翻转次数累加
if(num2 == 10) //达到最大值时恢复0
{
num2 = 0;
}
}
//=====================系统初始化=====================
void Init_sys()
{
Set_HC573(0, 0x00); //关闭所有锁存器
Set_HC573(5, 0x00); //关闭蜂鸣器和继电器
Set_HC573(4, 0xff); //关闭全部LED灯
DisplaySMG_All(0xff); //关闭全部数码管
}
//=======================主函数=======================
void main()
{
Init_sys(); //系统初始化
while(1)
{
LED_Control(); //灯光闪烁
Display_Num(); //数码管计数
}
}[Note]: For more information about the Blue Bridge Cup MCU preparation content, please refer to the "Blue Bridge Cup MCU Design and Development" Little Bee Special Training Manual , which can be downloaded from this site, and related more Blue Bridge Cup case complete source code and study preparations Competition notes, welcome to the official account of " Little Bee Notes ".