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如題： 求大神解惑，謝謝
程序如下：同時調(diào)用 串口1 和 串口2 ，調(diào)試結(jié)果為 同一時間 只能夠 有一個串口 產(chǎn)生作用。為什么？
#include "reg51.h"
#include "intrins.h"
#define FOSC 11059200UL
#define BRT (65536 - FOSC / 115200 / 4)
sfr AUXR = 0x8e;
sfr T2H = 0xd6;
sfr T2L = 0xd7;
bit busy;
char wptr;
char rptr;
char buffer[16];
void UartIsr() interrupt 4
{
if (TI)
{
TI = 0;
busy = 0;
}
if (RI)
{
RI = 0;
buffer[wptr++] = SBUF;
wptr &= 0x0f;
}
}
void UartInit()
{
SCON = 0x50;
T2L = BRT;
T2H = BRT >> 8;
AUXR = 0x15;
wptr = 0x00;
rptr = 0x00;
busy = 0;
}
void UartSend(char dat)
{
while (busy);
busy = 1;
SBUF = dat;
}
void UartSendStr(char *p)
{
while (*p)
{
UartSend(*p++);
}
}
void Uart2Isr() interrupt 8
{
if (S2CON & 0x02)
{
S2CON &= ~0x02;
busy = 0;
}
if (S2CON & 0x01)
{
S2CON &= ~0x01;
buffer[wptr++] = S2BUF;
wptr &= 0x0f;
}
}
void Uart2Init()
{
S2CON = 0x10;
T2L = BRT;
T2H = BRT >> 8;
AUXR = 0x14;
wptr = 0x00;
rptr = 0x00;
busy = 0;
}
void Uart2Send(char dat)
{
while (busy);
busy = 1;
S2BUF = dat;
}
void Uart2SendStr(char *p)
{
while (*p)
{
Uart2Send(*p++);
}
}
void main()
{
UartInit();
ES = 1;
EA = 1;
UartSendStr("Uart Test !\r\n");
while (1)
{
if (rptr != wptr)
{
UartSend(buffer[rptr++]);
rptr &= 0x0f;
}
}
}
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