54xdsp与计算机并口通讯.mht

有关dsp54x各方面编程的程序

        <p style="text-indent: 30">printf(&quot;Wrong register for HPI  
        write.&quot;;</p> 
        <p style="text-indent: 30">exit(-1);</p> 
        <p style="text-indent: 30">}</p> 
        <p style="text-indent: 30">outp(p_CONTROL,CONTROL);</p> 
        <p style="text-indent: 30">if((_inp(p_STATUS)&amp;0x08)!=0) //如果HBIL！=0</p> 
        <p style="text-indent: 30">{</p> 
        <p style="text-indent: 30">ChangeCONTROL(0,0); //重载函数</p> 
        <p style="text-indent: 30">//ChangCONTROL(BYTE bit,BYTE bValue)</p> 
        <p style="text-indent: 30">_outp(p_CONTROL,CONTROL); //HDS1=0</p> 
        <p style="text-indent: 30">ChangeCONTROL(0,1);</p> 
        <p style="text-indent: 30">_outp(p_CONTROL,CONTROL); //HDS1=1</p> 
        <p style="text-indent: 30">}</p> 
        <p style="text-indent: 30">/*开始时序的准备*/</p> 
        <p style="text-indent: 30">while((_inp(p_STATUS)&amp;0x08)!=0); //等待HBIL=0</p> 
        <p style="text-indent: 30">//（lst byte）</p> 
        <p style="text-indent: 30">if(r_w)//读</p> 
        <p style="text-indent: 30">{</p> 
        <p style="text-indent: 30">//在HPIR/W的上升沿对数据线采样（第一字节）</p> 
        <p style="text-indent: 30">ChangeCONTROL(2,1);</p> 
        <p style="text-indent: 30">-outp(p_CONTROL,CONTROL);</p> 
        <p style="text-indent: 30">ChangeCONTROL(0,0);</p> 
        <p style="text-indent: 30">_outp(p_CONTROL,CONTROL);//HDS1:1-&gt;0, //采样HCNTL0/1,HR/W，HBIL</p> 
        <p style="text-indent: 30">while(_inp(p_STATUS)&amp;0x10= =0); //若HDRY=0，//等待；HDRY=1，继续</p> 
        <p style="text-indent: 30">ChangeCONTROL(0,1);</p> 
        <p style="text-indent: 30">outp(pCONTROL,CONTROL);//HDS1：0-&gt;1； //锁存第1字节，然后HBIL=1</p> 
        <p style="text-indent: 30">*(data++)=_inp(p_DATA);</p> 
        <p style="text-indent: 30">while((_inp(p_STATUS)&amp; 0x08)= =0); //等待HBIL//=1(2nd  
        byte)</p> 
        <p style="text-indent: 30">ChangeCONTROL(2,0);</p> 
        <p style="text-indent: 30">_outp(p_CONTROL,CONTROL);</p> 
        <p style="text-indent: 30">//在HPIR/W的上升沿对数据线采样（第二字节）</p> 
        <p style="text-indent: 30">ChangeCONTROL(2,1);</p> 
        <p style="text-indent: 30">_outp(p_CONTROL,CONTROL);</p> 
        <p style="text-indent: 30">ChangeCONT^ROL(0,0);</p> 
        <p style="text-indent: 30">_outp(p_CONTROL,CONTROL);//HDS1:1-&gt;0,</p> 
        <p style="text-indent: 30">//采样HCNTL0/1，HR/W，HBIL</p> 
        <p style="text-indent: 30">while(_inp(p_STATUS)&amp;0x10)= =0);//若HDRY=0//等待，HDRY=1继续</p> 
        <p style="text-indent: 30">ChangeCONTROL(0,1);</p> 
        <p style="text-indent: 30">_outp(p_CONTROL,CONTROL)；//HDS1：0-&gt;1;  
        //锁存第2字节，然后HBIL=0</p> 
        <p style="text-indent: 30">*（data- -=_inp(p_DATA);</p> 
        <p style="text-indent: 30">while((_inp(p_STATUS)&amp;0x08)!=0); //等待HBIL=0</p> 
        <p style="text-indent: 30">（lst byte）</p> 
        <p style="text-indent: 30">ChangeCONTROL(2,0);</p> 
        <p style="text-indent: 30">_outp(p_CONTROL，CONTROL)；</p> 
        <p style="text-indent: 30">}</p> 
        <p style="text-indent: 30">else//写{（略）}</p> 
        <p style="text-indent: 30">}</p> 
        <p style="text-indent: 30">…</p> 
        <p style="text-indent: 30">void main(void)</p> 
        <p style="text-indent: 30">{</p> 
        <p style="text-indent: 30">/*HPI初始化*/…</p> 
        <p style="text-indent: 30">/*等待DSP给主机发中断HINT（查询方式）后，从DSP读数*/</p> 
        <p style="text-indent: 30">WriteHPIreg(&quot;HPIC&quot;,0x0808); //清HINT中断</p> 
        <p style="text-indent: 30">/*读取DSP片内RAM区数据*/</p> 
        <p style="text-indent: 30">for(i=0;i&lt;data_length;i++)//data_length：读取数据的长度</p> 
        <p style="text-indent: 30">{</p> 
        <p style="text-indent: 30">HPIA=resultAddr++;//resultAdd：要读取的RAM数//据区起始地址</p> 
        <p style="text-indent: 30">WriteHPIreg(&quot;HPIA&quot;,HPIA)；</p> 
        <p style="text-indent: 30">while((_inp(p_STATUS)&amp;0x40)！=0)；//等待DSP发//送HINT有效信号（握手信号）</p> 
        <p style="text-indent: 30">//调用读RAM区数据的函数，并写入创建的文件data.dat</p> 
        <p style="text-indent: 30">WriteHPIreg(&quot;HPIC&quot;,0x0808); //清HINT中断</p> 
        <p style="text-indent: 30">WriteHPIreg(&quot;HPIC&quot;,0x0404); //主机发送DSINT有//效给DSP（握手信号）</p> 
        <p style="text-indent: 30">}</p> 
        <p style="text-indent: 30">WriteHPIreg(&quot;HPIC&quot;,0x0808); //清NINT中断</p> 
        <p style="text-indent: 30">}</p> 
        <p style="text-indent: 30">试验证明，主机并口的读取速度远低于DSP的执行速度，因此，程序子函数中的一些等待查询指令可替略。在主函数main（）中，如果读取的DSP数据是静态的，不需实时提供，则这样的指令也可以省略。</p> 
        <p style="text-indent: 30">4.2 DSP的握手程序</p> 
        <p style="text-indent: 30">在实际情况中，需要传递的数据大都由DSP实时处理得到。一边处理一边传输可以大大提高系统的整体效率，而且由于HPI工作的特点，传输几乎可以不占用DSP的时间。唯一需要DSP干预的是数据准备好后通知主机接收（通过HINT中断）。这项任务可以放大DSP的DSPINT中断服务程序中进行其程序简要如下：</p> 
        <p style="text-indent: 30">.mmregs</p> 
        <p style="text-indent: 30">.include &quot;vectors.h&quot;</p> 
        <p style="text-indent: 30">dataarea .usect &quot;COMMS&quot;,100h,1;所需传递的数据块区间</p> 
        <p style="text-indent: 30">HOSTACK.macro</p> 
        <p style="text-indent: 30">hack ldm hpic,a ;累加器A载入HPIC值</p> 
        <p style="text-indent: 30">and #08h,a ;屏蔽HINT的其他位</p> 
        <p style="text-indent: 30">bc hack,aneq ;判断HINT的状态，直到HINT</p> 
        <p style="text-indent: 30">；位为0（即主机清HINT标志）</p> 
        <p style="text-indent: 30">.endm</p> 
        <p style="text-indent: 30">.text</p> 
        <p style="text-indent: 30">start:stm #00a0h,pmst;设置IPTR寄存器</p> 
        <p style="text-indent: 30">stm #0000h,st0 ;设置ST0、ST1寄存器</p> 
        <p style="text-indent: 30">stm #2800h,stl</p> 
        <p style="text-indent: 30">stm #0010,tcr ;关闭计时器</p> 
        <p style="text-indent: 30">stm #0ffffh,ifr ;清除所有的中断标志位<img border="0" src="cid:000401c6557d$317933dc$_CDOSYS2.0" align="right" hspace="1" vspace="1" width="372" height="215"></p>
        <p style="text-indent: 30">stm #0300h,imr ;使能DSPINT中断</p> 
        <p style="text-indent: 30">stm #280h,sp ;初始化堆栈指针SP为280h</p> 
        <p style="text-indent: 30">HOSTACK ;检查主机是否清HINT标志</p> 
        <p style="text-indent: 30">stm #0ah,hpic ;置HINT位，向主机发送</p> 
        <p style="text-indent: 30">;HINT有效信号，告知第一个数已准备就绪</p> 
        <p style="text-indent: 30">rsbx intm ;开启中断</p> 
        <p style="text-indent: 30">wait: b wait ;主程序（此处为死循环）</p> 
        <p style="text-indent: 30">hpi: stm #0ah,hpic ;当主机取完数后置DSPINT</p> 
        <p style="text-indent: 30">；位，进入DSPINT中断服务程序</p> 
        <p style="text-indent: 30">rete ;DSP向主机发送NINT握手</p> 
        <p style="text-indent: 30">；信号，通知下一个数已准备好</p> 
        <p style="text-indent: 30">.end     
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