lcd_8c-source.html

单片机的软件

00155 <span class="preprocessor">    #endif</span>
00156 <span class="preprocessor"></span>    <span class="comment">//  leave data lines in input mode so they can be most easily used for other purposes</span>
00157 <span class="preprocessor">    #ifdef LCD_DATA_4BIT</span>
00158 <span class="preprocessor"></span>        outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&amp;0x0F);     <span class="comment">// set data I/O lines to input (4bit)</span>
00159         outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0);   <span class="comment">// set pull-ups to on (4bit)</span>
00160 <span class="preprocessor">    #else</span>
00161 <span class="preprocessor"></span>        outb(LCD_DATA_DDR, 0x00);           <span class="comment">// set data I/O lines to input (8bit)</span>
00162         outb(LCD_DATA_POUT, 0xFF);          <span class="comment">// set pull-ups to on (8bit)</span>
00163 <span class="preprocessor">    #endif</span>
00164 <span class="preprocessor"></span><span class="preprocessor">#else</span>
00165 <span class="preprocessor"></span>    <span class="comment">// memory bus write</span>
00166     <span class="comment">//sbi(MCUCR, SRW);          // enable RAM waitstate</span>
00167     lcdBusyWait();              <span class="comment">// wait until LCD not busy</span>
00168     *((<span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) (LCD_CTRL_ADDR)) = data;
00169     <span class="comment">//cbi(MCUCR, SRW);          // disable RAM waitstate</span>
00170 <span class="preprocessor">#endif</span>
00171 <span class="preprocessor"></span>}
00172 
00173 u08 lcdControlRead(<span class="keywordtype">void</span>)
00174 {
00175 <span class="comment">// read the control byte from the display controller</span>
00176     <span class="keyword">register</span> u08 data;
00177 <span class="preprocessor">#ifdef LCD_PORT_INTERFACE</span>
00178 <span class="preprocessor"></span>    lcdBusyWait();              <span class="comment">// wait until LCD not busy</span>
00179 <span class="preprocessor">    #ifdef LCD_DATA_4BIT</span>
00180 <span class="preprocessor"></span>        outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&amp;0x0F);     <span class="comment">// set data I/O lines to input (4bit)</span>
00181         outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0);   <span class="comment">// set pull-ups to on (4bit)</span>
00182 <span class="preprocessor">    #else</span>
00183 <span class="preprocessor"></span>        outb(LCD_DATA_DDR, 0x00);           <span class="comment">// set data I/O lines to input (8bit)</span>
00184         outb(LCD_DATA_POUT, 0xFF);          <span class="comment">// set pull-ups to on (8bit)</span>
00185 <span class="preprocessor">    #endif</span>
00186 <span class="preprocessor"></span>    cbi(LCD_CTRL_PORT, LCD_CTRL_RS);        <span class="comment">// set RS to "control"</span>
00187     sbi(LCD_CTRL_PORT, LCD_CTRL_RW);        <span class="comment">// set R/W to "read"</span>
00188 <span class="preprocessor">    #ifdef LCD_DATA_4BIT</span>
00189 <span class="preprocessor"></span>        <span class="comment">// 4 bit read</span>
00190         sbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// set "E" line</span>
00191         LCD_DELAY;                      <span class="comment">// wait</span>
00192         LCD_DELAY;                      <span class="comment">// wait</span>
00193         data = inb(LCD_DATA_PIN)&amp;0xF0;  <span class="comment">// input data, high 4 bits</span>
00194         cbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// clear "E" line</span>
00195         LCD_DELAY;                      <span class="comment">// wait</span>
00196         LCD_DELAY;                      <span class="comment">// wait</span>
00197         sbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// set "E" line</span>
00198         LCD_DELAY;                      <span class="comment">// wait</span>
00199         LCD_DELAY;                      <span class="comment">// wait</span>
00200         data |= inb(LCD_DATA_PIN)&gt;&gt;4;   <span class="comment">// input data, low 4 bits</span>
00201         cbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// clear "E" line</span>
00202 <span class="preprocessor">    #else</span>
00203 <span class="preprocessor"></span>        <span class="comment">// 8 bit read</span>
00204         sbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// set "E" line</span>
00205         LCD_DELAY;                      <span class="comment">// wait</span>
00206         LCD_DELAY;                      <span class="comment">// wait</span>
00207         data = inb(LCD_DATA_PIN);       <span class="comment">// input data, 8bits</span>
00208         cbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// clear "E" line</span>
00209 <span class="preprocessor">    #endif</span>
00210 <span class="preprocessor"></span>    <span class="comment">//  leave data lines in input mode so they can be most easily used for other purposes</span>
00211 <span class="preprocessor">#else</span>
00212 <span class="preprocessor"></span>    <span class="comment">//sbi(MCUCR, SRW);          // enable RAM waitstate</span>
00213     lcdBusyWait();              <span class="comment">// wait until LCD not busy</span>
00214     data = *((<span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) (LCD_CTRL_ADDR));
00215     <span class="comment">//cbi(MCUCR, SRW);          // disable RAM waitstate</span>
00216 <span class="preprocessor">#endif</span>
00217 <span class="preprocessor"></span>    <span class="keywordflow">return</span> data;
00218 }
00219 
00220 <span class="keywordtype">void</span> lcdDataWrite(u08 data) 
00221 {
00222 <span class="comment">// write a data byte to the display</span>
00223 <span class="preprocessor">#ifdef LCD_PORT_INTERFACE</span>
00224 <span class="preprocessor"></span>    lcdBusyWait();                          <span class="comment">// wait until LCD not busy</span>
00225     sbi(LCD_CTRL_PORT, LCD_CTRL_RS);        <span class="comment">// set RS to "data"</span>
00226     cbi(LCD_CTRL_PORT, LCD_CTRL_RW);        <span class="comment">// set R/W to "write"</span>
00227 <span class="preprocessor">    #ifdef LCD_DATA_4BIT</span>
00228 <span class="preprocessor"></span>        <span class="comment">// 4 bit write</span>
00229         sbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// set "E" line</span>
00230         outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)|0xF0); <span class="comment">// set data I/O lines to output (4bit)</span>
00231         outb(LCD_DATA_POUT, (inb(LCD_DATA_POUT)&amp;0x0F) | (data&amp;0xF0) );  <span class="comment">// output data, high 4 bits</span>
00232         LCD_DELAY;                              <span class="comment">// wait</span>
00233         LCD_DELAY;                              <span class="comment">// wait</span>
00234         cbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// clear "E" line</span>
00235         LCD_DELAY;                              <span class="comment">// wait</span>
00236         LCD_DELAY;                              <span class="comment">// wait</span>
00237         sbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// set "E" line</span>
00238         outb(LCD_DATA_POUT, (inb(LCD_DATA_POUT)&amp;0x0F) | (data&lt;&lt;4) );    <span class="comment">// output data, low 4 bits</span>
00239         LCD_DELAY;                              <span class="comment">// wait</span>
00240         LCD_DELAY;                              <span class="comment">// wait</span>
00241         cbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// clear "E" line</span>
00242 <span class="preprocessor">    #else</span>
00243 <span class="preprocessor"></span>        <span class="comment">// 8 bit write</span>
00244         sbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// set "E" line</span>
00245         outb(LCD_DATA_DDR, 0xFF);           <span class="comment">// set data I/O lines to output (8bit)</span>
00246         outb(LCD_DATA_POUT, data);          <span class="comment">// output data, 8bits</span>
00247         LCD_DELAY;                              <span class="comment">// wait</span>
00248         LCD_DELAY;                              <span class="comment">// wait</span>
00249         cbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// clear "E" line</span>
00250 <span class="preprocessor">    #endif</span>
00251 <span class="preprocessor"></span>    <span class="comment">//  leave data lines in input mode so they can be most easily used for other purposes</span>
00252 <span class="preprocessor">    #ifdef LCD_DATA_4BIT</span>
00253 <span class="preprocessor"></span>        outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&amp;0x0F);     <span class="comment">// set data I/O lines to input (4bit)</span>
00254         outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0);   <span class="comment">// set pull-ups to on (4bit)</span>
00255 <span class="preprocessor">    #else</span>
00256 <span class="preprocessor"></span>        outb(LCD_DATA_DDR, 0x00);           <span class="comment">// set data I/O lines to input (8bit)</span>
00257         outb(LCD_DATA_POUT, 0xFF);          <span class="comment">// set pull-ups to on (8bit)</span>
00258 <span class="preprocessor">    #endif</span>
00259 <span class="preprocessor"></span><span class="preprocessor">#else</span>
00260 <span class="preprocessor"></span>    <span class="comment">// memory bus write</span>
00261     <span class="comment">//sbi(MCUCR, SRW);          // enable RAM waitstate</span>
00262     lcdBusyWait();              <span class="comment">// wait until LCD not busy</span>
00263     *((<span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) (LCD_DATA_ADDR)) = data;
00264     <span class="comment">//cbi(MCUCR, SRW);          // disable RAM waitstate</span>
00265 <span class="preprocessor">#endif</span>
00266 <span class="preprocessor"></span>}
00267 
00268 u08 lcdDataRead(<span class="keywordtype">void</span>)
00269 {
00270 <span class="comment">// read a data byte from the display</span>
00271     <span class="keyword">register</span> u08 data;
00272 <span class="preprocessor">#ifdef LCD_PORT_INTERFACE</span>
00273 <span class="preprocessor"></span>    lcdBusyWait();              <span class="comment">// wait until LCD not busy</span>
00274 <span class="preprocessor">    #ifdef LCD_DATA_4BIT</span>
00275 <span class="preprocessor"></span>        outb(LCD_DATA_DDR, inb(LCD_DATA_DDR)&amp;0x0F);     <span class="comment">// set data I/O lines to input (4bit)</span>
00276         outb(LCD_DATA_POUT, inb(LCD_DATA_POUT)|0xF0);   <span class="comment">// set pull-ups to on (4bit)</span>
00277 <span class="preprocessor">    #else</span>
00278 <span class="preprocessor"></span>        outb(LCD_DATA_DDR, 0x00);           <span class="comment">// set data I/O lines to input (8bit)</span>
00279         outb(LCD_DATA_POUT, 0xFF);          <span class="comment">// set pull-ups to on (8bit)</span>
00280 <span class="preprocessor">    #endif</span>
00281 <span class="preprocessor"></span>    sbi(LCD_CTRL_PORT, LCD_CTRL_RS);        <span class="comment">// set RS to "data"</span>
00282     sbi(LCD_CTRL_PORT, LCD_CTRL_RW);        <span class="comment">// set R/W to "read"</span>
00283 <span class="preprocessor">    #ifdef LCD_DATA_4BIT</span>
00284 <span class="preprocessor"></span>        <span class="comment">// 4 bit read</span>
00285         sbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// set "E" line</span>
00286         LCD_DELAY;                              <span class="comment">// wait</span>
00287         LCD_DELAY;                              <span class="comment">// wait</span>
00288         data = inb(LCD_DATA_PIN)&amp;0xF0;  <span class="comment">// input data, high 4 bits</span>
00289         cbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// clear "E" line</span>
00290         LCD_DELAY;                              <span class="comment">// wait</span>
00291         LCD_DELAY;                              <span class="comment">// wait</span>
00292         sbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// set "E" line</span>
00293         LCD_DELAY;                              <span class="comment">// wait</span>
00294         LCD_DELAY;                              <span class="comment">// wait</span>
00295         data |= inb(LCD_DATA_PIN)&gt;&gt;4;           <span class="comment">// input data, low 4 bits</span>
00296         cbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// clear "E" line</span>
00297 <span class="preprocessor">    #else</span>
00298 <span class="preprocessor"></span>        <span class="comment">// 8 bit read</span>
00299         sbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// set "E" line</span>
00300         LCD_DELAY;                              <span class="comment">// wait</span>
00301         LCD_DELAY;                              <span class="comment">// wait</span>
00302         data = inb(LCD_DATA_PIN);           <span class="comment">// input data, 8bits</span>
00303         cbi(LCD_CTRL_PORT, LCD_CTRL_E); <span class="comment">// clear "E" line</span>
00304 <span class="preprocessor">    #endif</span>
00305 <span class="preprocessor"></span>    <span class="comment">//  leave data lines in input mode so they can be most easily used for other purposes</span>
00306 <span class="preprocessor">#else</span>
00307 <span class="preprocessor"></span>    <span class="comment">// memory bus read</span>
00308     <span class="comment">//sbi(MCUCR, SRW);          // enable RAM waitstate</span>
00309     lcdBusyWait();              <span class="comment">// wait until LCD not busy</span>
00310     data = *((<span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) (LCD_DATA_ADDR));
00311     <span class="comment">//cbi(MCUCR, SRW);          // disable RAM waitstate</span>
00312 <span class="preprocessor">#endif</span>
00313 <span class="preprocessor"></span>    <span class="keywordflow">return</span> data;
00314 }
00315