lcd_8c-source.html

单片机的软件

00316 
00317 
00318 <span class="comment">/*************************************************************/</span>
00319 <span class="comment">/********************* PUBLIC FUNCTIONS **********************/</span>
00320 <span class="comment">/*************************************************************/</span>
00321 
00322 <span class="keywordtype">void</span> lcdInit()
00323 {
00324     <span class="comment">// initialize hardware</span>
00325     lcdInitHW();
00326     <span class="comment">// LCD function set</span>
00327     lcdControlWrite(LCD_FUNCTION_DEFAULT);
00328     <span class="comment">// clear LCD</span>
00329     lcdControlWrite(1&lt;&lt;LCD_CLR);
00330     delay(60000);   <span class="comment">// wait 60ms</span>
00331     <span class="comment">// set entry mode</span>
00332     lcdControlWrite(1&lt;&lt;LCD_ENTRY_MODE | 1&lt;&lt;LCD_ENTRY_INC);
00333     <span class="comment">// set display to on</span>
00334     <span class="comment">//lcdControlWrite(1&lt;&lt;LCD_ON_CTRL | 1&lt;&lt;LCD_ON_DISPLAY | 1&lt;&lt;LCD_ON_BLINK);</span>
00335     lcdControlWrite(1&lt;&lt;LCD_ON_CTRL | 1&lt;&lt;LCD_ON_DISPLAY );
00336     <span class="comment">// move cursor to home</span>
00337     lcdControlWrite(1&lt;&lt;LCD_HOME);
00338     <span class="comment">// set data address to 0</span>
00339     lcdControlWrite(1&lt;&lt;LCD_DDRAM | 0x00);
00340 
00341     <span class="comment">// load the first 8 custom characters</span>
00342     lcdLoadCustomChar((u08*)LcdCustomChar,0,0);
00343     lcdLoadCustomChar((u08*)LcdCustomChar,1,1);
00344     lcdLoadCustomChar((u08*)LcdCustomChar,2,2);
00345     lcdLoadCustomChar((u08*)LcdCustomChar,3,3);
00346     lcdLoadCustomChar((u08*)LcdCustomChar,4,4);
00347     lcdLoadCustomChar((u08*)LcdCustomChar,5,5);
00348     lcdLoadCustomChar((u08*)LcdCustomChar,6,6);
00349     lcdLoadCustomChar((u08*)LcdCustomChar,7,7);
00350 }
00351 
00352 <span class="keywordtype">void</span> lcdHome(<span class="keywordtype">void</span>)
00353 {
00354     <span class="comment">// move cursor to home</span>
00355     lcdControlWrite(1&lt;&lt;LCD_HOME);
00356 }
00357 
00358 <span class="keywordtype">void</span> lcdClear(<span class="keywordtype">void</span>)
00359 {
00360     <span class="comment">// clear LCD</span>
00361     lcdControlWrite(1&lt;&lt;LCD_CLR);
00362 }
00363 
00364 <span class="keywordtype">void</span> lcdGotoXY(u08 x, u08 y)
00365 {
00366     <span class="keyword">register</span> u08 DDRAMAddr;
00367 
00368     <span class="comment">// remap lines into proper order</span>
00369     <span class="keywordflow">switch</span>(y)
00370     {
00371     <span class="keywordflow">case</span> 0: DDRAMAddr = LCD_LINE0_DDRAMADDR+x; <span class="keywordflow">break</span>;
00372     <span class="keywordflow">case</span> 1: DDRAMAddr = LCD_LINE1_DDRAMADDR+x; <span class="keywordflow">break</span>;
00373     <span class="keywordflow">case</span> 2: DDRAMAddr = LCD_LINE2_DDRAMADDR+x; <span class="keywordflow">break</span>;
00374     <span class="keywordflow">case</span> 3: DDRAMAddr = LCD_LINE3_DDRAMADDR+x; <span class="keywordflow">break</span>;
00375     <span class="keywordflow">default</span>: DDRAMAddr = LCD_LINE0_DDRAMADDR+x;
00376     }
00377 
00378     <span class="comment">// set data address</span>
00379     lcdControlWrite(1&lt;&lt;LCD_DDRAM | DDRAMAddr);
00380 }
00381 
00382 <span class="keywordtype">void</span> lcdLoadCustomChar(u08* lcdCustomCharArray, u08 romCharNum, u08 lcdCharNum)
00383 {
00384     <span class="keyword">register</span> u08 i;
00385     u08 saveDDRAMAddr;
00386 
00387     <span class="comment">// backup the current cursor position</span>
00388     saveDDRAMAddr = lcdControlRead() &amp; 0x7F;
00389 
00390     <span class="comment">// multiply the character index by 8</span>
00391     lcdCharNum = (lcdCharNum&lt;&lt;3);   <span class="comment">// each character occupies 8 bytes</span>
00392     romCharNum = (romCharNum&lt;&lt;3);   <span class="comment">// each character occupies 8 bytes</span>
00393 
00394     <span class="comment">// copy the 8 bytes into CG (character generator) RAM</span>
00395     <span class="keywordflow">for</span>(i=0; i&lt;8; i++)
00396     {
00397         <span class="comment">// set CG RAM address</span>
00398         lcdControlWrite((1&lt;&lt;LCD_CGRAM) | (lcdCharNum+i));
00399         <span class="comment">// write character data</span>
00400         lcdDataWrite( pgm_read_byte(lcdCustomCharArray+romCharNum+i) );
00401     }
00402 
00403     <span class="comment">// restore the previous cursor position</span>
00404     lcdControlWrite(1&lt;&lt;LCD_DDRAM | saveDDRAMAddr);
00405 
00406 }
00407 
00408 <span class="keywordtype">void</span> lcdPrintData(<span class="keywordtype">char</span>* data, u08 nBytes)
00409 {
00410     <span class="keyword">register</span> u08 i;
00411 
00412     <span class="comment">// check to make sure we have a good pointer</span>
00413     <span class="keywordflow">if</span> (!data) <span class="keywordflow">return</span>;
00414 
00415     <span class="comment">// print data</span>
00416     <span class="keywordflow">for</span>(i=0; i&lt;nBytes; i++)
00417     {
00418         lcdDataWrite(data[i]);
00419     }
00420 }
00421 
00422 <span class="keywordtype">void</span> lcdProgressBar(u16 progress, u16 maxprogress, u08 length)
00423 {
00424     u08 i;
00425     u32 pixelprogress;
00426     u08 c;
00427 
00428     <span class="comment">// draw a progress bar displaying (progress / maxprogress)</span>
00429     <span class="comment">// starting from the current cursor position</span>
00430     <span class="comment">// with a total length of "length" characters</span>
00431     <span class="comment">// ***note, LCD chars 0-5 must be programmed as the bar characters</span>
00432     <span class="comment">// char 0 = empty ... char 5 = full</span>
00433 
00434     <span class="comment">// total pixel length of bargraph equals length*PROGRESSPIXELS_PER_CHAR;</span>
00435     <span class="comment">// pixel length of bar itself is</span>
00436     pixelprogress = ((progress*(length*PROGRESSPIXELS_PER_CHAR))/maxprogress);
00437     
00438     <span class="comment">// print exactly "length" characters</span>
00439     <span class="keywordflow">for</span>(i=0; i&lt;length; i++)
00440     {
00441         <span class="comment">// check if this is a full block, or partial or empty</span>
00442         <span class="comment">// (u16) cast is needed to avoid sign comparison warning</span>
00443         <span class="keywordflow">if</span>( ((i*(u16)PROGRESSPIXELS_PER_CHAR)+5) &gt; pixelprogress )
00444         {
00445             <span class="comment">// this is a partial or empty block</span>
00446             <span class="keywordflow">if</span>( ((i*(u16)PROGRESSPIXELS_PER_CHAR)) &gt; pixelprogress )
00447             {
00448                 <span class="comment">// this is an empty block</span>
00449                 <span class="comment">// use space character?</span>
00450                 c = 0;
00451             }
00452             <span class="keywordflow">else</span>
00453             {
00454                 <span class="comment">// this is a partial block</span>
00455                 c = pixelprogress % PROGRESSPIXELS_PER_CHAR;
00456             }
00457         }
00458         <span class="keywordflow">else</span>
00459         {
00460             <span class="comment">// this is a full block</span>
00461             c = 5;
00462         }
00463         
00464         <span class="comment">// write character to display</span>
00465         lcdDataWrite(c);
00466     }
00467 
00468 }
00469 
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Aug 22 04:29:27 2005 for Procyon AVRlib by&nbsp;
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address>
</body>
</html>