#include <reg52.h>
bit cmdArrived = 0; //命令到达标志，即接收到上位机下发的命令
unsigned char cmdIndex = 0;
unsigned char *ptrTxd;
unsigned char cntTxd = 0;
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; //开总中断
ConfigUART(9600); //配置波特率为9600
while (1)
{
if(cmdArrived)
{
cmdArrived = 0;
switch(cmdIndex) C语言中 不是指针子程序不改变主函数的值
{
case 1:
ptrTxd = array1;
cntTxd = sizeof(array1);
TI = 1;
break;
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; //配置串口为模式1
TMOD &= 0x0F; //清零T1的控制位
TMOD |= 0x20; //配置T1为模式2
TH1 = 256 - (11059200/12/32)/baud; //计算T1重载值
TL1 = TH1; //初值等于重载值
ET1 = 0; //禁止T1中断
ES = 1; //使能串口中断
TR1 = 1; //启动T1
}
void InterruptUART() interrupt 4
{
if (RI) //接收到字节
{
RI = 0; //清零接收中断标志位
cmdIndex = SBUF;
cmdArrived = 1;
}
if (TI) //字节发送完毕
{
TI = 0; //清零发送中断标志位
if(cntTxd > 0)
{
SBUF = *ptrTxd;
cntTxd--;
ptrTxd++;
}
}
} |
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