首页 普通IO模拟串口

普通IO模拟串口

上传者： q452197900 | 上传时间： 2022-06-21 15:14:28 | 文件大小： 61KB | 文件类型： RAR
外部中断模拟串口，波特率不能超过65536 实验测试：发送57600可以正常，但接收只能 <= 38400 #include "Uart_EXT0.h" #include "MAIN.h" #define FOCS 22114800ul bit Over; bit bRxflag; unsigned char IEN0_NOW,IEN1_NOW; //中断临时变量 unsigned char idata bRxstate=0; //接收状态 unsigned char idata tmp_Len=0; //缓存数组下标 unsigned char idata bRxlen; //接收字节数 unsigned char xdata EX_buf[64]; //接收存放区 /*************************************************** baud = 56000 接收一字节 =178.6us ，接收会出现错误 baud = 38400 接收一字节 =260.4us //快速接收都容易出现错误 baud = 19200 接收一字节 =520us | baud = 14400 接收一字节 =694.5us | baud = 9600 接收一字节 =1041.6us | baud = 4800 接收一字节 =2.083ms 接收过长，定时器MODE2无法满足 //主机发送的数据最好加上校验字 发送：最大57600，发送还能正常。 ****************************************************/ void Time0_Uart(unsigned int baud) { TMOD &= 0XF0; TMOD |= 0X02; //使用定时器0方式2，使用方式1则2400波特也能有 TH0 = 256-(FOCS/12)/baud; TL0 = TH0; IP0 |= 0x02; //设置为最高优先级 IP1 |= 0x02; TR0 = 1; ET0 = 1; EA = 1; } void Time0_isr() interrupt 1 { //方式1则重装值 Over = 1; } /* 发送数据，1起始位，8数据，1停止位 发送波特率实验57600都不会错误，大量发送数据待测试 */ void Uart_set(unsigned char dat) { unsigned char i; Over = 0; TL0 = TH0; //防止发送数据开始时不知道TL0是多少 T_uart = 0; //起始位 while(Over==0); Over = 0; for(i=0;i<8;i++) //8数据位 {// Over = 0; //起始位时清零了 if(dat&0x01) //先发最低位 { T_uart = 1; } else { T_uart = 0; } while(Over==0); Over = 0; dat >>= 1; } // Over = 0; //数据位清零了 T_uart = 1; //停止位，此后如果没有数据则一直为高 while(Over==0); } unsigned char get_Uart() { unsigned char I=0,get_dat=0; Over = 0; TL0 = TH0; //重新赋值，防止出错 while(Over==0); Over = 0; for(I=0;I<8;I++) { get_dat >>= 1; if(Get_ex == 1) get_dat |= 0x80; else get_dat &= 0x7f; while(Over==0); Over = 0; } if(Get_ex == 1) { Over = 0; } return get_dat; } void EXuart_isr() interrupt 0 { unsigned char _chr; IEN0_NOW = IEN0; //进入接收1字节，关闭中断 IEN1_NOW = IEN1; IEN0 = 0X82; IEN1 = 0; _chr=get_Uart(); switch(bRxstate) { case 0: if(_chr==0x55) { bRxstate=1; } else bRxstate=0; break; case 1: if(_chr==0xaa) { bRxstate=2; } else bRxstate=0; break; case 2: //取得数据长度 bRxlen=_chr; bRxstate=3; break; case 3: EX_buf[tmp_Len]=_chr; tmp_Len++; if(tmp_Len==bRxlen) { bRxstate=0; tmp_Len=0; bRxflag=1; //一帧数据接收完毕，置位完成标志位 } break; default: break; } IE0 = 0; //清外部0中断标志，防止下次接收不到 IEN0 = IEN0_NOW; IEN1 = IEN1_NOW; } void main() { Time0_Uart(9600); EX_uart(); if(bRxflag==1) { bRxflag = 0; for(i=0;i<10;i++) RevBuffer[i] = EX_buf[i]; T0Uart_TX(10,RevBuffer); } }

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