跪求，stc12c5a60s2的串口2输出不了怎么办？

烧入的时候，选项有没有打勾呢？

大神你好，是哪个选项，我烧串口1的程序进去，能输出，串口2就没输出，还是官网的代码。

波特率对不对，IO设置了没有

将你烧录时的截图发送上传看看

发上程序和烧录截图上来，大家帮你分析一下啊

如图

/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC12C5Axx Series MCU UART2 (8-bit/9-bit)Demo ---------------*/
/* --- Mobile: (86)13922805190 -------------------------------------*/
/* --- Fax: 86-0513-55012956,55012947,55012969 ---------------------*/
/* --- Tel: 86-0513-55012928,55012929,55012966----------------------*/
/* --- Web: www.STCMCU.com -----------------------------------------*/
/* --- Web: www.GXWMCU.com -----------------------------------------*/
/* If you want to use the program or the program referenced in the  */
/* article, please specify in which data and procedures from STC    */
/*------------------------------------------------------------------*/

#include "reg51.h"
#include "intrins.h"

typedef unsigned char BYTE;
typedef unsigned int WORD;

#define FOSC 11059200L      //System frequency
#define BAUD 115200         //UART baudrate

/*Define UART parity mode*/
#define NONE_PARITY     0   //None parity
#define ODD_PARITY      1   //Odd parity
#define EVEN_PARITY     2   //Even parity
#define MARK_PARITY     3   //Mark parity
#define SPACE_PARITY    4   //Space parity

#define PARITYBIT EVEN_PARITY   //Testing even parity

/*Declare SFR associated with the UART2 */
sfr AUXR  = 0x8e;           //Auxiliary register
sfr S2CON = 0x9a;           //UART2 control register
sfr S2BUF = 0x9b;           //UART2 data buffer
sfr BRT   = 0x9c;           //Baudrate generator
sfr IE2   = 0xaf;           //Interrupt control 2

#define S2RI  0x01          //S2CON.0
#define S2TI  0x02          //S2CON.1
#define S2RB8 0x04          //S2CON.2
#define S2TB8 0x08          //S2CON.3

bit busy;

void SendData(BYTE dat);
void SendString(char *s);

void main()
{
#if (PARITYBIT == NONE_PARITY)
    S2CON = 0x50;           //8-bit variable UART
#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
    S2CON = 0xda;           //9-bit variable UART, parity bit initial to 1
#elif (PARITYBIT == SPACE_PARITY)
    S2CON = 0xd2;           //9-bit variable UART, parity bit initial to 0
#endif

    BRT = -(FOSC/32/BAUD);  //Set auto-reload vaule of baudrate generator
    AUXR = 0x14;            //Baudrate generator work in 1T mode
    IE2 = 0x01;             //Enable UART2 interrupt
    EA = 1;                 //Open master interrupt switch

    SendString("STC12C5A60S2rnUart2 Test !rn");
    while(1);
}

/*----------------------------
UART2 interrupt service routine
----------------------------*/
void Uart2() interrupt 8 using 1
{
    if (S2CON & S2RI)
    {
        S2CON &= ~S2RI;     //Clear receive interrupt flag
        P0 = S2BUF;         //P0 show UART data
        P2 = (S2CON & S2RB8);//P2.2 show parity bit
    }
    if (S2CON & S2TI)
    {
        S2CON &= ~S2TI;     //Clear transmit interrupt flag
        busy = 0;           //Clear transmit busy flag
    }
}

/*----------------------------
Send a byte data to UART
Input: dat (data to be sent)
Output:None
----------------------------*/
void SendData(BYTE dat)
{
    while (busy);           //Wait for the completion of the previous data is sent
    ACC = dat;              //Calculate the even parity bit P (PSW.0)
    if (P)                  //Set the parity bit according to P
    {
#if (PARITYBIT == ODD_PARITY)
        S2CON &= ~S2TB8;    //Set parity bit to 0
#elif (PARITYBIT == EVEN_PARITY)
        S2CON |= S2TB8;     //Set parity bit to 1
#endif
    }
    else
    {
#if (PARITYBIT == ODD_PARITY)
        S2CON |= S2TB8;     //Set parity bit to 1
#elif (PARITYBIT == EVEN_PARITY)
        S2CON &= ~S2TB8;    //Set parity bit to 0
#endif
    }
    busy = 1;
    S2BUF = ACC;            //Send data to UART2 buffer
}

/*----------------------------
Send a string to UART
Input: s (address of string)
Output:None
----------------------------*/
void SendString(char *s)
{
    while (*s)              //Check the end of the string
    {
        SendData(*s++);     //Send current char and increment string ptr
    }
}

下次冷启动选项

刚才勾了，重新烧程序进去，串口2的程序还是没输出

大神们，而且我将P1.2跟P1.3（这款单片机串口2的RXD2 TXD2）短接起来，用串口调试助手发数据，还是没法自发自收，而将串口1的P3.0跟P3.1短接，就能自发自收，小白不懂什么问题

P1.0 P1.1选项

勾选了，还是不行，下载程序是能下载进去，但是下载完后用串口调试助手看，串口2的代码没输出，串口1就正常

求帮助小弟

求助

大哥，求帮帮忙，小白小弟被这个问题困住了好久了

我只是路过打酱油的，嘿嘿

我的是stc12c5a60s2,那个官方代码是stc15F的。而且我用官方的stc12c5a60s2的串口2代码烧进去，没有任何输出，不知道是我哪一步有问题，用了两片单片机都不行。

是这个程序吗？