请大侠指点迷津:在串口中断服务函数里比如当串口接收到数据4时,程序依次执行61,62,63,64,65,66,17,18,19,20,21,37,38,39,40,41,67,68,69,70,71,72,73,74,75,然后就跳出67,if(TI)这个函数了,此时TI=0,RI=0,cmdArrived=0,主程序就停在17的位置了,此时第72行就执行了一次,就发送了数组的首地址的数据,然而事实上是都发送完了。请大侠指导一下,谢谢
各位大侠先看代码
1,#include <reg52.h>
2,bit cmdArrived = 0; //命令到达标志,即接收到上位机下发的命令
3,unsigned char cmdIndex = 0;//命令索引,与上位机约定好的数组编号
4,unsigned char *ptrTxd;//串口发送指针
5,unsigned char cntTxd = 0;//串口发送计数器
6,unsigned char array1[1] = {1}; //数组1
7,unsigned char array2[2] = {1,2}; //数组2
8,unsigned char array3[4] = {1,2,3,4}; //数组3
9,unsigned char array4[8] = {1,2,3,4,5,6,7,8};//数组4
10,void ConfigUART(unsigned int baud);
11,void main()
12,{
13, EA = 1; //开总中断
14, ConfigUART(9600); //配置波特率为9600
15, while (1)
16, {
17, if(cmdArrived) 串口接收到数据标志为真
18, {
19, cmdArrived = 0;
20, switch(cmdIndex) //cmdIndex为串口接收的数值
21, {
22, case 1:
23, ptrTxd = array1;//数组1的首地址赋值给发送指针
24, cntTxd = sizeof(array1);//数组1的长度赋值给发送计数器
25, TI = 1;//手动方式启动发送中断,处理数据发送
26, break;
27, case 2:
28, ptrTxd = array2;
29, cntTxd = sizeof(array2);
30, TI = 1;
31, break;
32, case 3:
33, ptrTxd = array3;
34, cntTxd = sizeof(array3);
35, TI = 1;
36, break;
37, case 4:
38, ptrTxd = array4;
39, cntTxd = sizeof(array4);
40, TI = 1;
41, break;
42, default:
43, break;
44, }
45, }
46,}
47,}
48,void ConfigUART(unsigned int baud)
49,{
50, SCON = 0x50; //配置串口为模式1
51, TMOD &= 0x0F; //清零T1的控制位
52, TMOD |= 0x20; //配置T1为模式2
53, TH1 = 256 - (11059200/12/32)/baud; //计算T1重载值
54, TL1 = TH1; //初值等于重载值
55, ET1 = 0; //禁止T1中断
56, ES = 1; //使能串口中断
57, TR1 = 1; //启动T1
58,}
59,void InterruptUART() interrupt 4 //串口中断服务函数
60,{
61, if (RI) //接收到字节
62, {
63, RI = 0; //清零接收中断标志位
64, cmdIndex = SBUF; //接收的数值送给cmdIndex
65, cmdArrived = 1; //设置命令到达标志
66, }
67, if (TI) //字节发送完毕
68, {
69, TI = 0; //清零发送中断标志位
70, if(cntTxd > 0)
71, {
72, SBUF = *ptrTxd;//发送指针指向的数据
73, cntTxd--;//发送计数器递减
74, ptrTxd++;//发送计数器递增
75, }
}
}
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