STC有模拟串口的官方范例程序:
- /*---------------------------------------------------------------------*/
- /* --- STC MCU Limited ------------------------------------------------*/
- /* --- STC15Fxx 系列 软件模拟串口举例----------------------------------*/
- /* --- Mobile: (86)13922805190 ----------------------------------------*/
- /* --- Fax: 86-0513-55012956,55012947,55012969 ------------------------*/
- /* --- Tel: 86-0513-55012928,55012929,55012966-------------------------*/
- /* --- Web: www.STCMCU.com --------------------------------------------*/
- /* --- Web: www.GXWMCU.com --------------------------------------------*/
- /* 如果要在程序中使用此代码,请在程序中注明使用了STC的资料及程序 */
- /* 如果要在文章中应用此代码,请在文章中注明使用了STC的资料及程序 */
- /*---------------------------------------------------------------------*/
- //本示例在Keil开发环境下请选择Intel的8058芯片型号进行编译
- //若无特别说明,工作频率一般为11.0592MHz
- #include "reg51.h"
- //-----------------------------------------
- //define baudrate const
- //BAUD = 65536 - FOSC/3/BAUDRATE/M (1T:M=1; 12T:M=12)
- //NOTE: (FOSC/3/BAUDRATE) must be greater then 98, (RECOMMEND GREATER THEN 110)
- //#define BAUD 0xF400 // 1200bps @ 11.0592MHz
- //#define BAUD 0xFA00 // 2400bps @ 11.0592MHz
- //#define BAUD 0xFD00 // 4800bps @ 11.0592MHz
- //#define BAUD 0xFE80 // 9600bps @ 11.0592MHz
- //#define BAUD 0xFF40 //19200bps @ 11.0592MHz
- #define BAUD 0xFFA0 //38400bps @ 11.0592MHz
- //#define BAUD 0xEC00 // 1200bps @ 18.432MHz
- //#define BAUD 0xF600 // 2400bps @ 18.432MHz
- //#define BAUD 0xFB00 // 4800bps @ 18.432MHz
- //#define BAUD 0xFD80 // 9600bps @ 18.432MHz
- //#define BAUD 0xFEC0 //19200bps @ 18.432MHz
- //#define BAUD 0xFF60 //38400bps @ 18.432MHz
- //#define BAUD 0xE800 // 1200bps @ 22.1184MHz
- //#define BAUD 0xF400 // 2400bps @ 22.1184MHz
- //#define BAUD 0xFA00 // 4800bps @ 22.1184MHz
- //#define BAUD 0xFD00 // 9600bps @ 22.1184MHz
- //#define BAUD 0xFE80 //19200bps @ 22.1184MHz
- //#define BAUD 0xFF40 //38400bps @ 22.1184MHz
- //#define BAUD 0xFF80 //57600bps @ 22.1184MHz
- sfr AUXR = 0x8E;
- sbit RXB = P3^0; //define UART TX/RX port
- sbit TXB = P3^1;
- typedef bit BOOL;
- typedef unsigned char BYTE;
- typedef unsigned int WORD;
- BYTE TBUF,RBUF;
- BYTE TDAT,RDAT;
- BYTE TCNT,RCNT;
- BYTE TBIT,RBIT;
- BOOL TING,RING;
- BOOL TEND,REND;
- void UART_INIT();
- BYTE t, r;
- BYTE buf[16];
- void main()
- {
- TMOD = 0x00; //timer0 in 16-bit auto reload mode
- AUXR = 0x80; //timer0 working at 1T mode
- TL0 = BAUD;
- TH0 = BAUD>>8; //initial timer0 and set reload value
- TR0 = 1; //tiemr0 start running
- ET0 = 1; //enable timer0 interrupt
- PT0 = 1; //improve timer0 interrupt priority
- EA = 1; //open global interrupt switch
- UART_INIT();
- while (1)
- { //user's function
- if (REND)
- {
- REND = 0;
- buf[r++ & 0x0f] = RBUF;
- }
- if (TEND)
- {
- if (t != r)
- {
- TEND = 0;
- TBUF = buf[t++ & 0x0f];
- TING = 1;
- }
- }
- }
- }
- //-----------------------------------------
- //Timer interrupt routine for UART
- void tm0() interrupt 1
- {
- if (RING)
- {
- if (--RCNT == 0)
- {
- RCNT = 3; //reset send baudrate counter
- if (--RBIT == 0)
- {
- RBUF = RDAT; //save the data to RBUF
- RING = 0; //stop receive
- REND = 1; //set receive completed flag
- }
- else
- {
- RDAT >>= 1;
- if (RXB) RDAT |= 0x80; //shift RX data to RX buffer
- }
- }
- }
- else if (!RXB)
- {
- RING = 1; //set start receive flag
- RCNT = 4; //initial receive baudrate counter
- RBIT = 9; //initial receive bit number (8 data bits + 1 stop bit)
- }
- if (--TCNT == 0)
- {
- TCNT = 3; //reset send baudrate counter
- if (TING) //judge whether sending
- {
- if (TBIT == 0)
- {
- TXB = 0; //send start bit
- TDAT = TBUF; //load data from TBUF to TDAT
- TBIT = 9; //initial send bit number (8 data bits + 1 stop bit)
- }
- else
- {
- TDAT >>= 1; //shift data to CY
- if (--TBIT == 0)
- {
- TXB = 1;
- TING = 0; //stop send
- TEND = 1; //set send completed flag
- }
- else
- {
- TXB = CY; //write CY to TX port
- }
- }
- }
- }
- }
- //-----------------------------------------
- //initial UART module variable
- void UART_INIT()
- {
- TING = 0;
- RING = 0;
- TEND = 1;
- REND = 0;
- TCNT = 0;
- RCNT = 0;
- }
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