标题: stc12c5a60s2单片机串口不够用，TXD,RXD该怎么拓展啊？求大佬解答 [打印本页]

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作者: 雨晨    时间: 2018-8-1 11:22
标题: stc12c5a60s2单片机串口不够用，TXD,RXD该怎么拓展啊？求大佬解答
好像是有专门拓展芯片，求介绍那个比较好用

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作者: guangshi_wq    时间: 2018-8-1 12:29
1,普通IO口摸拟,2,串口协义中指定地址要操作哪个从机,主机TXD,从机1,RXD,从机2,RXD,主机RXD,从机1,TXD,从机2,TXD

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作者: huliujie    时间: 2018-8-1 16:06
用LS165或LS164芯片

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作者: yousunny    时间: 2018-8-2 08:45
那个烧录软件下有范例程序，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. /*------------------------------------------------------------------*/
   
7. 
   
8. #include "reg51.h"
   
9. #include "intrins.h"
   
10. 
    
11. typedef unsigned char BYTE;
    
12. typedef unsigned int WORD;
    
13. 
    
14. #define FOSC 18432000L      //System frequency
    
15. #define BAUD 115200         //UART baudrate
    
16. 
    
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
    
23. 
    
24. #define PARITYBIT EVEN_PARITY   //Testing even parity
    
25. 
    
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
    
32. 
    
33. #define S2RI  0x01          //S2CON.0
    
34. #define S2TI  0x02          //S2CON.1
    
35. #define S2RB8 0x04          //S2CON.2
    
36. #define S2TB8 0x08          //S2CON.3
    
37. 
    
38. bit busy;
    
39. 
    
40. void SendData(BYTE dat);
    
41. void SendString(char *s);
    
42. 
    
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
    
52. 
    
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
    
57. 
    
58.     SendString("STC12C5A60S2\r\nUart2 Test !\r\n");
    
59.     while(1);
    
60. }
    
61. 
    
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. }
    
79. 
    
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. }
     
108. 
     
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. }
     

复制代码

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作者: 什么什么    时间: 2018-9-5 16:06
你现在找到合适的了吗，求分享，也遇到同样的问题了

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作者: sxhwdz    时间: 2018-9-5 18:32
可以使用STC15W4K32S4替代，这个有4个串口可用

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作者: zhongmeijun007    时间: 2018-9-5 20:12
普通IO口就可以模拟

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作者: 小猫猫爱吃鱼    时间: 2018-9-5 20:21

什么什么 发表于 2018-9-5 16:06
你现在找到合适的了吗，求分享，也遇到同样的问题了

那你需要几个串口才够用？

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作者: guangshi_wq    时间: 2020-2-3 23:20
还可这样IOto232
#include <reg52.h>
sbit BT_SND =P3^1;
sbit BT_REC =P3^0;
/**********************************************

IO 口模拟232通讯程序

使用两种方式的C程序 占用定时器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;
}

//发送一个字符
void PSendChar(unsigned char inch)
{
unsigned char ii;
ii=0;
F_TM=0;
BT_SND=0; //start bit
TIMER0_ENABLE; //启动
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
}

//接收一个字符
unsigned char PGetChar()
{
unsigned char rch,ii;
TIMER0_ENABLE;
F_TM=0;
ii=0;
rch=0;
while(!F_TM); //等过起始位

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;
}

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

}

void main()
{
unsigned char gch;
TMOD=0x22; //定时器1为工作模式2(8位自动重装)，0为模式2(8位自动重装)
PCON=00;
TR0=0; //在发送或接收才开始使用
TF0=0;
TH0=(256-104); //9600bps 就是 1000000/9600=104.167微秒 执行的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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