STC15F104W串口接收问题
STC15F104W没有串口通信能力吧？把P3.0口改成模拟串口接收，怎么也不能接收数据？在5V供电情况下，怎么配置，电压3.3V以下，怎么回事？模拟串口
#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 BAUD0xF400 // 1200bps @ 11.0592MHz
//#define BAUD0xFA00 // 2400bps @ 11.0592MHz
//#define BAUD0xFD00 // 4800bps @ 11.0592MHz
//#define BAUD0xFE80 // 9600bps @ 11.0592MHz
//#define BAUD0xFF40 //19200bps @ 11.0592MHz
#define BAUD0xFFA0 //38400bps @ 11.0592MHz
typedef unsigned char uchar;
typedef unsigned int uint;
sfrAUXR = 0x8E;
sbit RXB = P3^0; //define UART TX/RX port
sbit TXB = P3^1;
uchar TBUF,RBUF;
uchar TDAT,RDAT;
uchar TCNT,RCNT;
uchar TBIT,RBIT;
bit TING,RING;
bit TEND,REND;
uchar t, r;
uchar buf;
//初始UART模块
void UART_INIT()
{
TING = 0;
RING = 0;
TEND = 1;
REND = 0;
TCNT = 0;
RCNT = 0;
TMOD = 0x00; //timer0 in 16-bit auto reload mode
AUXR = 0x80; //timer0 working at 1T mode
TL0 = BAUD; //波特率38400
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
}
//
void main()
{
// P0M0 = 0x00;
// P0M1 = 0x00;
// P1M0 = 0x00;
// P1M1 = 0x00;
// P2M0 = 0x00;
// P2M1 = 0x00;
// P3M0 = 0x00;
// P3M1 = 0x00;
UART_INIT();
while (1)
{ //user's function
if (REND)
{
REND = 0;
buf = RBUF;
}
if (TEND)
{
if (t != r)
{
TEND = 0;
TBUF = buf;
TING = 1;
}
}
}
}
//-----------------------------------------
//Timer interrupt routine for UART
void tm0() interrupt 1 using 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
}
}
}
}
}
//-----------------------------------------
页:
[1]