📄 c51单片机串行口中断服务程序.htm
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mso-hansi-font-family:"\000B "'>如不想等待则在调用前检测</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'>inbufsign</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>是否为</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B "'>1</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>。</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
uchar getbyte (void) <br>
{ char idata c <br>
; while (!inbufsign); //</span><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>缓冲区空等待</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
ES=0; c= *getlast; //</span><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>取数据</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
getlast++; //</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>最后取走的数据位置加一</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
inbufful=0; //</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>输入缓冲区的满标志清零</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
if (getlast==inbuf+ILEN) getlast=inbuf; //</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>地址到顶部回到底部</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
if (getlast==inlast) inbufsign=0; //</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>地址相等置接收缓冲区空空标志，再取数前要检该标志</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
ES=1; return (c); <br>
//</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>取回数据</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> } <br>
//***************************************** //</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>接收一行数据，必须定义放数据串的指针位置和大小</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
del=0x7f,backspace=0x08,cr=0x0d,lf=0x0a <br>
void getline (uchar idata *line, unsigned char n) <br>
{ unsigned char cnt = 0; //</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>定义已接收的长度</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
char c; <br>
do <br>
{ if ((c = getbyte ()) == 0x0d) <br>
c = 0x00; //</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>读一个字节，如果是回车换成结束符</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
if (c == 0x08 || c == 0x7f) //BACKSPACE </span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>和</span><span lang=EN-US style='font-size:9.0pt;
font-family:"\000B "'> DEL </span><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>的处理</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
{ <br>
if (cnt != 0) //</span><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>已经输入退掉一个字符</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
{cnt--; //</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>总数目减一</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
line--; //</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>指针减一</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
putbyte (0x08); //</span><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>屏幕回显的处理</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
putbyte (' '); <br>
putbyte (0x08); <br>
} <br>
} <br>
else <br>
{ putbyte (*line = c); <br>
//</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>其他字符取入，回显</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
line++; //</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>指针加一</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
cnt++; //</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>总数目加一</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
} <br>
} while (cnt < n - 1 && c != 0x00 && c!=0x1b); //</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>数目到了，回车或</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'>ESC</span><span style='font-size:
9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>停止</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
*line = 0; //</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>再加上停止符</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'>0 } <br>
//**************************** <br>
//</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>模拟接收到一个数据</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
putinbuf(uchar c) <br>
{ES=0; if(!inbufful) <br>
{*inlast= c; //</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>放入数据</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> inlast++; <br>
//</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>最后放入的位置加一</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
if (inlast==inbuf+ILEN) <br>
inlast=inbuf;//</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>地址到顶部回到底部</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
if (inlast==getlast) <br>
inbufful=1; //</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>接收缓冲区满置满标志</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
inbufsign=1; <br>
}<br>
ES=1; <br>
}<br>
//***************************************** <br>
//</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>串口中断处理</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
serial () interrupt 4 { if (TI ) <br>
{ <br>
TI = 0; <br>
if (outbufsign) //<br>
if (putlast==outlast) <br>
outbufsign=0; //<br>
else {SBUF=*outlast; //</span><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>未发送完继续发送</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
outlast++; //</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>最后传出去的字节位置加一</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
if (outlast==outbuf+OLEN) <br>
outlast=outbuf;//</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>地址到顶部回到底部</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
if (putlast==outlast) <br>
outbufsign=0; //</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>数据发送完置发送缓冲区空标志</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
} <br>
} <br>
if (RI) <br>
{ <br>
RI = 0; if(!inbufful) <br>
{ *inlast= SBUF; //</span><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>放入数据</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
inlast++; //</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>最后放入的位置加一</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
inbufsign=1; <br>
if (inlast==inbuf+ILEN) <br>
inlast=inbuf;//</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>地址到顶部回到底部</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> <br>
if (inlast==getlast) <br>
inbufful=1; //</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>接收缓冲区满置满标志</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'> <br>
} <br>
}<br>
} <br>
//***************************** <br>
//</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
"\000B ";mso-hansi-font-family:"\000B "'>串口初始化</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'> 0xfd=19200,0xfa=9600,0xf4=4800,0xe8=2400,0xd0=1200 <br>
serial_init ()<br>
{ <br>
SCON = 0x50; /* mode 1: 8-bit UART, enable receiver */ <br>
TMOD |= 0x20; /* timer 1 mode 2: 8-Bit reload */ <br>
PCON |= 0x80; <br>
TH1 = 0xfd;//fa, //baud*2 <br>
/* reload value 19200 baud */ <br>
TR1 = 1; /* timer 1 run */ <br>
ES = 1; <br>
REN=1; <br>
EA=1; <br>
SM2=1; //SM2=1</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>时收到的第</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'>9</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>位为</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B "'>1</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>才置位</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'>RI</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>标志</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B "'> <br>
//TMOD |=0x01; //th1 auto load 2X8,th0 1X16 //TH0=31; <br>
TL0=0; //X 32 =1S //TR0=1; ET0=1; }</span></p>
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