学习一个单片机UART串口通信的例程,为什么接收不到数据？ -

#include "reg52.h"
bit cmdArrived = 0;
unsigned char cmdIndex = 0;
unsigned char cntTXD = 0;
unsigned char *ptrTXD;
unsigned char Array1[1] = {1};
unsigned char Array2[2] = {1,2};
unsigned char Array3[4] = {1,2,3,4};
unsigned char Array4[8] = {1,2,3,4,5,6,7,8};
void ConfigUART(unsigned int baud);
void main()
{
EA = 1;
ConfigUART(9600);
while(1)
{
if(cmdArrived == 1)
{
cmdArrived = 0;
switch(cmdIndex)//根据接受到的命令发送不同的数据
{
case(1):ptrTXD = Array1;cntTXD = sizeof(Array1);TI = 1;break;//将Array1第一个元素的地址赋给指针变量
case(2):ptrTXD = Array2;cntTXD = sizeof(Array2);TI = 1;break;
case(3):ptrTXD = Array3;cntTXD = sizeof(Array3);TI = 1;break;
case(4):ptrTXD = Array4;cntTXD = sizeof(Array4);TI = 1;break;
default:break;
}
}
}
}
void ConfigUART(unsigned int baud)
{
SCON = 0x50;
TMOD &= 0x0f;
TMOD |= 0x20;
TH1 = 256 - (11059200/12/32)/baud;
TL1 = TH1;
ET1 = 0;
ES = 1;
TR1 = 1;
}
void interruptUART() interrupt 4
{
if(RI)
{
cmdIndex = SBUF;
cmdArrived = 1;
RI = 0;
}
if(TI)
{
TI = 0;
if(cntTXD > 0)
{
SBUF = *ptrTXD;
ptrTXD++;
cntTXD--;
}
}
}

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