蓝桥杯单片机串口初始化加上之后，数码管就不能正常显示了，为什么

Question

我串口用的定时器1，数码管显示用的定时器2。当没有写串口初始化的时候，数码管可以正常显示，加上串口初始化之后，数码管就不能正常显示了，为什么呀？
main.c

#include <STC15F2K60S2.H>
#include "hardware.h"
//----------------------------------------------------------------------
void Delay(unsigned int t)
{
    while(t--);
}
//----------------------------------------------------------------------

//----------------------------------------------------------------------
void main()
{
    Timer5Init();    
    Init_Uart();
    Delay(60000);
    Delay(60000);
    while(1)
    {
        
    }
}

hardware.c

#include <STC15F2K60S2.H>
#include "hardware.h"
/*************  本地常量声明    **************/
unsigned char code t_display[]={                       //标准字库
//   0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
    0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,
//black  -     H    J    K    L    N    o   P    U     t    G    Q    r   M    y
    0x00,0x40,0x76,0x1E,0x70,0x38,0x37,0x5C,0x73,0x3E,0x78,0x3d,0x67,0x50,0x37,0x6e,
    0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF,0x46};    //0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1

unsigned char code T_COM[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};      //位码
unsigned char SMG_buf[8]={2,0,2,4,17,4,17,9};
unsigned char led_buf=0xff;
unsigned char ws_buf=0x00;
unsigned char timer10ms=0;
//-----------------------------------------------------------------------------------------------
void SelectHC573(unsigned char channel)
{
    switch(channel)
    {
        case 4:
            P2=(P2&0x1f)|0x80;
        break;
        case 5:
            P2=(P2&0x1f)|0xa0;
        break;
        case 6:
            P2=(P2&0x1f)|0xc0;
        break;
        case 7:
            P2=(P2&0x1f)|0xe0;
        break;
        case 0:
            P2=(P2&0x1f)|0x00;
        break;
    }
}
//--------------------------------------------------------------------------
void led_output()
{
    P0=led_buf;
    SelectHC573(4);
    SelectHC573(0);
}
//--------------------------------------------------------------------------
void SMG_output()
{
    static unsigned char SMG_com=0;
    
    P0=0x00;
    SelectHC573(6);
    SelectHC573(0);
    
    P0=~t_display[SMG_buf[SMG_com]];
    SelectHC573(7);
    SelectHC573(0);
    
    P0=T_COM[SMG_com];
    SelectHC573(6);
    SelectHC573(0);
    
    if(++SMG_com>=8)
    {
        SMG_com=0;
    }
    
}
//-------------------------------------------------------------------
void ws_output()
{
    P0=ws_buf;
    SelectHC573(5);
    SelectHC573(0);
}
//--------------------------------------------------------------------
void Timer5Init()        //1毫秒@12.000MHz,定时器2
{    
    AUXR |= 0x04;        //定时器时钟1T模式
    T2L = 0x20;        //设置定时初值
    T2H = 0xD1;        //设置定时初值
    AUXR |= 0x10;        //定时器2开始计时
    IE2|=0x04; 
    EA = 1;
}

//--------------------------------------------------------------------
void ServiceTimer2()interrupt 12
{
    led_output();
    ws_output();
    SMG_output();
    timer10ms++;
}
//--------------------------------------------------------------------
void Init_Uart()//串口用计时器1
{
    TMOD=0x20;
    TH1=0xfd;
    TL1=0xfd;
    TR1=1;
    SCON=0x50;
    AUXR=0x00;
    ES=1;
    EA=1;
}

Answer 1

上午好☀️☀️☀️️
本答案参考ChatGPT-3.5

原因：串口初始化可能会修改定时器的配置寄存器，导致之前设置的定时器2配置被改变。

解决方案：

1.检查串口初始化的代码，确保它不会修改定时器2的配置寄存器。

2.将串口初始化的代码移动到定时器2的初始化代码之后，以确保定时器2的配置在设置完之后不会被改变。同时，在串口初始化代码之前添加一个延时，以便定时器2能够正确地初始化。

修改后的代码：

main.c

#include <STC15F2K60S2.H>
#include "hardware.h"

void Delay(unsigned int t)
{
    while(t--);
}

void main()
{
    Timer5Init();    
    Delay(1000);  // 1秒延时
    Init_Uart();  
    while(1)
    {
        
    }
}

hardware.c

#include <STC15F2K60S2.H>
#include "hardware.h"

unsigned char code t_display[]={
//   0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
    0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,
//black  -     H    J    K    L    N    o   P    U     t    G    Q    r   M    y
    0x00,0x40,0x76,0x1E,0x70,0x38,0x37,0x5C,0x73,0x3E,0x78,0x3d,0x67,0x50,0x37,0x6e,
    0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF,0x46};    //0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1

unsigned char code T_COM[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};      //位码
unsigned char SMG_buf[8]={2,0,2,4,17,4,17,9};
unsigned char led_buf=0xff;
unsigned char ws_buf=0x00;
unsigned char timer10ms=0;

void SelectHC573(unsigned char channel)
{
    switch(channel)
    {
        case 4:
            P2=(P2&0x1f)|0x80;
        break;
        case 5:
            P2=(P2&0x1f)|0xa0;
        break;
        case 6:
            P2=(P2&0x1f)|0xc0;
        break;
        case 7:
            P2=(P2&0x1f)|0xe0;
        break;
        case 0:
            P2=(P2&0x1f)|0x00;
        break;
    }
}

void led_output()
{
    P0=led_buf;
    SelectHC573(4);
    SelectHC573(0);
}

void SMG_output()
{
    static unsigned char SMG_com=0;
    
    P0=0x00;
    SelectHC573(6);
    SelectHC573(0);
    
    P0=~t_display[SMG_buf[SMG_com]];
    SelectHC573(7);
    SelectHC573(0);
    
    P0=T_COM[SMG_com];
    SelectHC573(6);
    SelectHC573(0);
    
    if(++SMG_com>=8)
    {
        SMG_com=0;
    }
    
}

void ws_output()
{
    P0=ws_buf;
    SelectHC573(5);
    SelectHC573(0);
}

void Timer5Init()        //1毫秒@12.000MHz,定时器2
{    
    AUXR |= 0x04;        //定时器时钟1T模式
    T2L = 0x20;        //设置定时初值
    T2H = 0xD1;        //设置定时初值
    AUXR |= 0x10;        //定时器2开始计时
    IE2|=0x04; 
    EA = 1;
}

void ServiceTimer2()interrupt 12
{
    led_output();
    ws_output();
    SMG_output();
    timer10ms++;
}

void Init_Uart()//串口用计时器1
{
    TMOD=0x20;
    TH1=0xfd;
    TL1=0xfd;
    TR1=1;
    SCON=0x50;
    AUXR=0x00;
    ES=1;
    EA=1;
}