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標題: stc12c5a60s2單片機串口不夠用，TXD,RXD該怎么拓展啊？求大佬解答 [打印本頁]
作者: 雨晨    時間: 2018-8-1 11:22
標題: stc12c5a60s2單片機串口不夠用，TXD,RXD該怎么拓展啊？求大佬解答
好像是有專門拓展芯片，求介紹那個比較好用

作者: guangshi_wq    時間: 2018-8-1 12:29
1,普通IO口摸擬,2,串口協義中指定地址要操作哪個從機,主機TXD,從機1,RXD,從機2,RXD,主機RXD,從機1,TXD,從機2,TXD
作者: huliujie    時間: 2018-8-1 16:06
用LS165或LS164芯片
作者: yousunny    時間: 2018-8-2 08:45
那個燒錄軟件下有范例程序，串口二的
  1. /*------------------------------------------------------------------*/
  2. /* --- STC MCU Limited ---------------------------------------------*/
  3. /* --- STC12C5Axx Series MCU UART2 (8-bit/9-bit)Demo ---------------*/
  4. /* If you want to use the program or the program referenced in the  */
  5. /* article, please specify in which data and procedures from STC    */
  6. /*------------------------------------------------------------------*/

  8. #include "reg51.h"
  9. #include "intrins.h"

  11. typedef unsigned char BYTE;
  12. typedef unsigned int WORD;

  14. #define FOSC 18432000L      //System frequency
  15. #define BAUD 115200         //UART baudrate

  17. /*Define UART parity mode*/
  18. #define NONE_PARITY     0   //None parity
  19. #define ODD_PARITY      1   //Odd parity
  20. #define EVEN_PARITY     2   //Even parity
  21. #define MARK_PARITY     3   //Mark parity
  22. #define SPACE_PARITY    4   //Space parity

  24. #define PARITYBIT EVEN_PARITY   //Testing even parity

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

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

  38. bit busy;

  40. void SendData(BYTE dat);
  41. void SendString(char *s);

  43. void main()
  44. {
  45. #if (PARITYBIT == NONE_PARITY)
  46.     S2CON = 0x50;           //8-bit variable UART
  47. #elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
  48.     S2CON = 0xda;           //9-bit variable UART, parity bit initial to 1
  49. #elif (PARITYBIT == SPACE_PARITY)
  50.     S2CON = 0xd2;           //9-bit variable UART, parity bit initial to 0
  51. #endif

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

  58.     SendString("STC12C5A60S2\r\nUart2 Test !\r\n");
  59.     while(1);
  60. }

  62. /*----------------------------
  63. UART2 interrupt service routine
  64. ----------------------------*/
  65. void Uart2() interrupt 8 using 1
  66. {
  67.     if (S2CON & S2RI)
  68.     {
  69.         S2CON &= ~S2RI;     //Clear receive interrupt flag
  70.         P0 = S2BUF;         //P0 show UART data
  71.         P2 = (S2CON & S2RB8);//P2.2 show parity bit
  72.     }
  73.     if (S2CON & S2TI)
  74.     {
  75.         S2CON &= ~S2TI;     //Clear transmit interrupt flag
  76.         busy = 0;           //Clear transmit busy flag
  77.     }
  78. }

  80. /*----------------------------
  81. Send a byte data to UART
  82. Input: dat (data to be sent)
  83. Output:None
  84. ----------------------------*/
  85. void SendData(BYTE dat)
  86. {
  87.     while (busy);           //Wait for the completion of the previous data is sent
  88.     ACC = dat;              //Calculate the even parity bit P (PSW.0)
  89.     if (P)                  //Set the parity bit according to P
  90.     {
  91. #if (PARITYBIT == ODD_PARITY)
  92.         S2CON &= ~S2TB8;    //Set parity bit to 0
  93. #elif (PARITYBIT == EVEN_PARITY)
  94.         S2CON |= S2TB8;     //Set parity bit to 1
  95. #endif
  96.     }
  97.     else
  98.     {
  99. #if (PARITYBIT == ODD_PARITY)
  100.         S2CON |= S2TB8;     //Set parity bit to 1
  101. #elif (PARITYBIT == EVEN_PARITY)
  102.         S2CON &= ~S2TB8;    //Set parity bit to 0
  103. #endif
  104.     }
  105.     busy = 1;
  106.     S2BUF = ACC;            //Send data to UART2 buffer
  107. }

  109. /*----------------------------
  110. Send a string to UART
  111. Input: s (address of string)
  112. Output:None
  113. ----------------------------*/
  114. void SendString(char *s)
  115. {
  116.     while (*s)              //Check the end of the string
  117.     {
  118.         SendData(*s++);     //Send current char and increment string ptr
  119.     }
  120. }
復制代碼


作者: 什么什么    時間: 2018-9-5 16:06
你現在找到合適的了嗎，求分享，也遇到同樣的問題了
作者: sxhwdz    時間: 2018-9-5 18:32
可以使用STC15W4K32S4替代，這個有4個串口可用
作者: zhongmeijun007    時間: 2018-9-5 20:12
普通IO口就可以模擬
作者: 小貓貓愛吃魚    時間: 2018-9-5 20:21
什么什么 發表于 2018-9-5 16:06
你現在找到合適的了嗎，求分享，也遇到同樣的問題了

那你需要幾個串口才夠用？
作者: guangshi_wq    時間: 2020-2-3 23:20
還可這樣IOto232
#include <reg52.h>
sbit BT_SND =P3^1;
sbit BT_REC =P3^0;
/**********************************************

IO 口模擬232通訊程序

使用兩種方式的C程序 占用定時器0

**********************************************/
#define F_TM F0
#define TIMER0_ENABLE TL0=TH0; TR0=1;
#define TIMER0_DISABLE TR0=0;
#define uchar unsigned char
#define uint unsigned int



sbit ACC0= ACC^0;
sbit ACC1= ACC^1;
sbit ACC2= ACC^2;
sbit ACC3= ACC^3;
sbit ACC4= ACC^4;
sbit ACC5= ACC^5;
sbit ACC6= ACC^6;
sbit ACC7= ACC^7;

uchar bufSND[8],bufRCV[8],putRCV,getRCV,curSND,lenSND,staRCV;
uchar putKEY,getKEY,nFUN,nSTN,Cxy,Cxy0,nTIM;

void IntTimer0() interrupt 1
{
F_TM=1;
}

//發送一個字符
void PSendChar(unsigned char inch)
{
unsigned char ii;
ii=0;
F_TM=0;
BT_SND=0; //start bit
TIMER0_ENABLE; //啟動
while(!F_TM);
while(ii<8){
    if(inch&1)BT_SND=1;
    else BT_SND=0;
    F_TM=0;
    while(!F_TM);
    ii++;
        inch>>=1;
        }
BT_SND=1;
F_TM=0;
while(!F_TM);
TIMER0_DISABLE; //停止timer
}

//接收一個字符
unsigned char PGetChar()
{
unsigned char rch,ii;
TIMER0_ENABLE;
F_TM=0;
ii=0;
rch=0;
while(!F_TM); //等過起始位

while(ii<8)
{
rch>>=1;
if(BT_REC)
{
rch|=0x80;
}
ii++;
F_TM=0;
while(!F_TM);
}
F_TM=0;
while(!F_TM)
{
if(BT_REC)
{
break;
}
}
TIMER0_DISABLE; //停止timer
return rch;
}

//檢查是不是有起始位
bit StartBitOn()
{
return (BT_REC==0);

}

void main()
{
unsigned char gch;
TMOD=0x22; //定時器1為工作模式2(8位自動重裝)，0為模式2(8位自動重裝)
PCON=00;
TR0=0; //在發送或接收才開始使用
TF0=0;
TH0=(256-104); //9600bps 就是 1000000/9600=104.167微秒 執行的timer是104.167*11.0592/12= 96
TL0=TH0;
ET0=1;
EA=1;

//PSendChar(0x55);
//PSendChar(0xaa);
//PSendChar(0x00);
//PSendChar(0xff);

while(1)
{
if(StartBitOn())
{
gch=PGetChar();
bufRCV[putRCV++]=PGetChar();
putRCV &= 0X07;
   if(bSD){if(curSND<lenSND) SBUF=bufSND[curSND++];else {bSD=OFF;}}
PSendChar(gch);
}
}
}



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