95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
//功能：单片机读取VGUS屏返回指令
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//来源：武汉中显科技有限公司 www.viewtech.cn
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//全局变量
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u16 StartNum=0,TalNum=0;
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#define BUFFER_SIZE 2048//指令缓冲区大小，用户可根据自己单片机的容量修改
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u8 CommBuff[BUFFER_SIZE]//定义指令缓冲区
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#define USER_R3 0xA5//帧头
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#define USER_RA 0x5A//帧头
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/////////////////
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//串口中断函数
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//用户根据单片机的不同，修改串口中断函数，中断函数内只保存串口数据到缓冲区
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void USART3_IRQHandler(void)
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{
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CommBuff[TalNum++]=USART_ReceiveData(USART3);//保存串口数据
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if(TalNum==BUFFER_SIZE)
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TalNum=0;
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}
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//主程序指令解析函数
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//用户在主循环中调用
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void deal_command()
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{
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u16 i,CurNum,tem_TalNum;
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u8 CmdBuf[256];
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u16 nowbuffer,len;
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len=StartNum;
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tem_TalNum=TalNum;
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if(tem_TalNum==len)//
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return;
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if(CommBuff[StartNum]!=USER_R3)
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{
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StartNum++;
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if(StartNum==BUFFER_SIZE)
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StartNum=0;
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return;
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}
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if(tem_TalNum>len)
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nowbuffer=tem_TalNum-len;
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else
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nowbuffer=tem_TalNum+BUFFER_SIZE-len;
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if(nowbuffer<5)
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return;
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CurNum=StartNum+2;
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if(CurNum>BUFFER_SIZE-1)
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CurNum-=BUFFER_SIZE;
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len=CommBuff[CurNum]+3;
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if(nowbuffer<len)
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return;
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i=0;
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CurNum=StartNum;
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while(1)
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{
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CmdBuf[i++]=CommBuff[CurNum++];
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if(CurNum==BUFFER_SIZE)
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CurNum=0;
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if(i==4)
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{
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if(CmdBuf[0]!=USER_R3||CmdBuf[1]!=USER_RA)//
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{
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StartNum=CurNum;
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return;
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}
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len=CmdBuf[2];
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}
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else if(i>4)
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{
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if(i==len+3)//
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{
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StartNum=CurNum;
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break;
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}
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else if(i>255)//
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{
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StartNum=CurNum;
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return;
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}
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else if(CurNum==tem_TalNum)
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return;
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}
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}
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///现在解析指令CmdBuf保存一整条指令
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switch(CmdBuf[3])
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{
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case 0x81:
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break;
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case 0x83:
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break;
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default:////命令无效,删除
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break;
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}
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return;
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} |