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<a name="l00151"></a>00151 <a name="l00152"></a><a class="code" href="usart_8h.html#48c8d76fc9fdde84b94a6e09184a6446">00152</a> <span class="keywordtype">int</span> <a class="code" href="usart_8c.html#48c8d76fc9fdde84b94a6e09184a6446">usart_init_rs232</a>(<span class="keyword">volatile</span> <span class="keyword">struct</span> avr32_usart_t * usart, <span class="keyword">struct</span> <a class="code" href="structusart__options__t.html">usart_options_t</a> * opt, <span class="keywordtype">long</span> cpu_hz)<a name="l00153"></a>00153 {<a name="l00154"></a>00154 <span class="keywordtype">int</span> retval;<a name="l00155"></a>00155 <a name="l00156"></a>00156 <span class="comment">/* Reset the usart and shutdown RX and TX */</span><a name="l00157"></a>00157 <a class="code" href="usart_8c.html#e994c1e7797dda76388176f208a2e6f2">usart_reset</a>(usart);<a name="l00158"></a>00158 <a name="l00159"></a>00159 <span class="comment">/* Control input values */</span><a name="l00160"></a>00160 <span class="keywordflow">if</span> (opt == 0) <span class="comment">/* Null pointer */</span><a name="l00161"></a>00161 <span class="keywordflow">return</span> <a class="code" href="usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00162"></a>00162 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#a6b77cc05829d2e70ee7f96194c6ce23">charlength</a> < 5 || opt-><a class="code" href="structusart__options__t.html#a6b77cc05829d2e70ee7f96194c6ce23">charlength</a> > 9)<a name="l00163"></a>00163 <span class="keywordflow">return</span> <a class="code" href="usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00164"></a>00164 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#85401f7a6f516a5883adc0538dc27f8e">paritytype</a> > 7)<a name="l00165"></a>00165 <span class="keywordflow">return</span> <a class="code" href="usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00166"></a>00166 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#433a6ede2186d42b4cf19ef4b370cd61">stopbits</a> > 2+255)<a name="l00167"></a>00167 <span class="keywordflow">return</span> <a class="code" href="usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00168"></a>00168 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#0dc365b8779891743180e9b69116f5ea">channelmode</a> > 3)<a name="l00169"></a>00169 <span class="keywordflow">return</span> <a class="code" href="usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00170"></a>00170 <a name="l00171"></a>00171 <span class="keywordflow">if</span> ((retval = <a class="code" href="usart_8c.html#6f965be9b52e86ba6f47f12a0b6d08e7">usart_set_baudrate</a>(usart, opt-><a class="code" href="structusart__options__t.html#276ad428776a25b8247762bd2c82b35b">baudrate</a>, cpu_hz)) != \<a name="l00172"></a>00172 <a class="code" href="usart_8h.html#cbf846773f58a382f10f8daf94797059">USART_SUCCESS</a>)<a name="l00173"></a>00173 <span class="keywordflow">return</span> retval;<a name="l00174"></a>00174 <a name="l00175"></a>00175 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#a6b77cc05829d2e70ee7f96194c6ce23">charlength</a> == 9) {<a name="l00176"></a>00176 <span class="comment">/* Charlength set to 9 bits; MODE9 dominates CHRL */</span><a name="l00177"></a>00177 usart->mr |= (1<<AVR32_USART_MR_MODE9_OFFSET);<a name="l00178"></a>00178 } <span class="keywordflow">else</span> {<a name="l00179"></a>00179 <span class="comment">/* CHRL gives the charlength( - 5) when USART_MODE9=0 */</span><a name="l00180"></a>00180 usart->mr |=<a name="l00181"></a>00181 ((opt-><a class="code" href="structusart__options__t.html#a6b77cc05829d2e70ee7f96194c6ce23">charlength</a>-5) << AVR32_USART_MR_CHRL_OFFSET);<a name="l00182"></a>00182 }<a name="l00183"></a>00183 <a name="l00184"></a>00184 usart->mr |= (opt-><a class="code" href="structusart__options__t.html#0dc365b8779891743180e9b69116f5ea">channelmode</a> << AVR32_USART_MR_CHMODE_OFFSET) |<a name="l00185"></a>00185 (opt-><a class="code" href="structusart__options__t.html#85401f7a6f516a5883adc0538dc27f8e">paritytype</a> << AVR32_USART_MR_PAR_OFFSET);<a name="l00186"></a>00186 <a name="l00187"></a>00187 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#433a6ede2186d42b4cf19ef4b370cd61">stopbits</a> > 2)<a name="l00188"></a>00188 {<a name="l00189"></a>00189 <span class="comment">/* Set two stop bits */</span><a name="l00190"></a>00190 usart->mr |= (2 << AVR32_USART_MR_NBSTOP_OFFSET);<a name="l00191"></a>00191 <span class="comment">/* And a timeguard period gives the rest */</span><a name="l00192"></a>00192 usart->ttgr = (opt-><a class="code" href="structusart__options__t.html#433a6ede2186d42b4cf19ef4b370cd61">stopbits</a>-2);<a name="l00193"></a>00193 }<a name="l00194"></a>00194 <span class="keywordflow">else</span><a name="l00195"></a>00195 <span class="comment">/* Insert 1, 1.5 or 2 stop bits */</span><a name="l00196"></a>00196 usart->mr |= (opt-><a class="code" href="structusart__options__t.html#433a6ede2186d42b4cf19ef4b370cd61">stopbits</a> << AVR32_USART_MR_NBSTOP_OFFSET);<a name="l00197"></a>00197 <a name="l00198"></a>00198 <span class="comment">/* Setup complete; enable communication */</span><a name="l00199"></a>00199 <span class="comment">/* Enable input and output */</span><a name="l00200"></a>00200 usart->cr |= (1<<AVR32_USART_CR_TXEN_OFFSET) |<a name="l00201"></a>00201 (1<<AVR32_USART_CR_RXEN_OFFSET);<a name="l00202"></a>00202 <a name="l00203"></a>00203 <span class="keywordflow">return</span> <a class="code" href="usart_8h.html#cbf846773f58a382f10f8daf94797059">USART_SUCCESS</a>;<a name="l00204"></a>00204 }<a name="l00205"></a>00205 <a name="l00206"></a>00206 <span class="comment">/*</span><a name="l00207"></a>00207 <span class="comment"> * Description: This function is meant to be run after rs232_init().</span><a name="l00208"></a>00208 <span class="comment"> * It sets up the usart to use handshaking in its communication.</span><a name="l00209"></a>00209 <span class="comment"> * Arguments: *usart: Base address of the usart</span><a name="l00210"></a>00210 <span class="comment"> * *opt: Options needed to set up RS232 communcation (see usart_options_t)</span><a name="l00211"></a>00211 <span class="comment"> * cpu_hz: The clock frequency of the usart module</span><a name="l00212"></a>00212 <span class="comment"> * software_handshaking:</span><a name="l00213"></a>00213 <span class="comment"> * 1= Use software handshaking</span><a name="l00214"></a>00214 <span class="comment"> * 0= Use hardware handshaking (requires extra wiring)</span><a name="l00215"></a>00215 <span class="comment"> * xon_char: Character sent from receiver to transmitter when more</span><a name="l00216"></a>00216 <span class="comment"> * data can be sent. (Software handshaking only)</span><a name="l00217"></a>00217 <span class="comment"> * xoff_char: Sent from recv. to trans. when recv. buffers are full (sw)</span><a name="l00218"></a>00218 <span class="comment"> * Returns: USART_SUCCESS or USART_INVALID_INPUT</span><a name="l00219"></a>00219 <span class="comment"> */</span><a name="l00220"></a><a class="code" href="usart_8c.html#54b39126c57d8c1511a1f199b681a8eb">00220</a> <span class="keywordtype">int</span> <a class="code" href="usart_8c.html#54b39126c57d8c1511a1f199b681a8eb">usart_init_handshaking</a>(<span class="keyword">volatile</span> <span class="keyword">struct</span> avr32_usart_t * usart, <span class="keyword">struct</span> <a class="code" href="structusart__options__t.html">usart_options_t</a> * opt,<a name="l00221"></a>00221 <span class="keywordtype">long</span> cpu_hz, <span class="keywordtype">int</span> software_handshaking,<a name="l00222"></a>00222 <span class="keywordtype">char</span> xon_char, <span class="keywordtype">char</span> xoff_char)<a name="l00223"></a>00223 {<a name="l00224"></a>00224 <span class="keywordtype">int</span> retval;<a name="l00225"></a>00225 <a name="l00226"></a>00226 <span class="comment">/* First: Setup standard RS323 */</span><a name="l00227"></a>00227 <span class="keywordflow">if</span> ((retval = <a class="code" href="usart_8c.html#48c8d76fc9fdde84b94a6e09184a6446">usart_init_rs232</a>(usart, opt, cpu_hz)) != <a class="code" href="usart_8h.html#cbf846773f58a382f10f8daf94797059">USART_SUCCESS</a>)<a name="l00228"></a>00228 <span class="keywordflow">return</span> retval;<a name="l00229"></a>00229 <a name="l00230"></a>00230 <span class="keywordflow">if</span> (software_handshaking == 0)<a name="l00231"></a>00231 {<a name="l00232"></a>00232 <span class="comment">/* Clear previous mode */</span><a name="l00233"></a>00233 usart-> mr &= ~(0xf << AVR32_USART_MR_MODE_OFFSET);<a name="l00234"></a>00234 <span class="comment">/* Hardware handshaking */</span><a name="l00235"></a>00235 usart-> mr |= (<a class="code" href="usart_8h.html#20f58bd59d4177ad2981c8fa338a95af">USART_MODE_HW_HSH</a> << AVR32_USART_MR_MODE_OFFSET);<a name="l00236"></a>00236 }<a name="l00237"></a>00237 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (software_handshaking == 1)<a name="l00238"></a>00238 {<a name="l00239"></a>00239 <span class="comment">/* Clear previous mode */</span><a name="l00240"></a>00240 usart-> mr &= ~(0xf << AVR32_USART_MR_MODE_OFFSET);<a name="l00241"></a>00241 <span class="comment">/* Software handshaking */</span><a name="l00242"></a>00242 usart-> mr |= (<a class="code" href="usart_8h.html#1af49d7b84d7323c6842945413559e94">USART_MODE_SW_HSH</a> << AVR32_USART_MR_MODE_OFFSET);<a name="l00243"></a>00243 <span class="comment">/* Set XON and XOFF characters */</span><a name="l00244"></a>00244 usart->xxr = (xon_char << AVR32_USART_XXR_XON_OFFSET) |<a name="l00245"></a>00245 (xoff_char << AVR32_USART_XXR_XOFF_OFFSET);<a name="l00246"></a>00246 }<a name="l00247"></a>00247 <span class="keywordflow">else</span><a name="l00248"></a>00248 <span class="keywordflow">return</span> <a class="code" href="usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00249"></a>00249 <a name="l00250"></a>00250 <span class="keywordflow">return</span> <a class="code" href="usart_8h.html#cbf846773f58a382f10f8daf94797059">USART_SUCCESS</a>;<a name="l00251"></a>00251 }<a name="l00252"></a>00252 <a name="l00253"></a>00253 <span class="comment">/*</span><a name="l00254"></a>00254 <span class="comment"> * Description: Setup the usart to use the IrDA protocol</span><a name="l00255"></a>00255 <span class="comment"> * Arguments: *usart: Base address of the usart</span><a name="l00256"></a>00256 <span class="comment"> * *opt: Options needed to set up RS232 communcation (see usart_options_t)</span><a name="l00257"></a>00257 <span class="comment"> * cpu_hz: The module's clock frequency</span><a name="l00258"></a>00258 <span class="comment"> * irda_filter: Counter used to seperate received ones from zeros</span><a name="l00259"></a>00259 <span class="comment"> * Returns: USART_SUCCESS or USART_INVALID_INPUT</span><a name="l00260"></a>00260 <span class="comment"> */</span><a name="l00261"></a><a class="code" href="usart_8c.html#8db29da20412777c74c322d0fae89ecb">00261</a> <span class="keywordtype">int</span> <a class="code" href="usart_8c.html#8db29da20412777c74c322d0fae89ecb">usart_init_IrDA</a>(<span class="keyword">volatile</span> <span class="keyword">struct</span> avr32_usart_t * usart, <span class="keyword">struct</span> <a class="code" href="structusart__options__t.html">usart_options_t</a> * opt,<a name="l00262"></a>00262 <span class="keywordtype">long</span> cpu_hz, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> irda_filter)<a name="l00263"></a>00263 {<a name="l00264"></a>00264 <span class="keywordtype">int</span> retval;<a name="l00265"></a>00265 <a name="l00266"></a>00266 <span class="comment">/* First: Setup standard RS323 */</span><a name="l00267"></a>00267 <span class="keywordflow">if</span> ((retval = <a class="code" href="usart_8c.html#48c8d76fc9fdde84b94a6e09184a6446">usart_init_rs232</a>(usart, opt, cpu_hz)) != <a class="code" href="usart_8h.html#cbf846773f58a382f10f8daf94797059">USART_SUCCESS</a>)<a name="l00268"></a>00268 <span class="keywordflow">return</span> retval;<a name="l00269"></a>00269 <a name="l00270"></a>00270 <span class="comment">/* Set IrDA counter */</span><a name="l00271"></a>00271 usart->ifr = irda_filter;<a name="l00272"></a>00272 <a name="l00273"></a>00273 <span class="comment">/* Activate "low-pass filtering" of input */</span><a name="l00274"></a>00274 usart->mr |= (1 << AVR32_USART_MR_FILTER_OFFSET);<a name="l00275"></a>00275 <span class="keywordflow">return</span> <a class="code" href="usart_8h.html#cbf846773f58a382f10f8daf94797059">USART_SUCCESS</a>;<a name="l00276"></a>00276 }<a name="l00277"></a>00277 <a name="l00278"></a>00278 <span class="comment">/*</span><a name="l00279"></a>00279 <span class="comment"> * Description: Setup the usart to use the Modem protocol, activating special inputs/outputs</span><a name="l00280"></a>00280 <span class="comment"> * Arguments: *usart: Base address of the usart</span><a name="l00281"></a>00281 <span class="comment"> * *opt: Options needed to set up RS232 communcation (see usart_options_t)</span><a name="l00282"></a>00282 <span class="comment">* cpu_hz: The module's clock frequency</span><a name="l00283"></a>00283 <span class="comment"> * Returns: USART_SUCCESS or USART_INVALID_INPUT</span><a name="l00284"></a>00284 <span class="comment"> */</span><a name="l00285"></a><a class="code" href="usart_8c.html#10edfa287366908edc4182421d00008b">00285</a> <span class="keywordtype">int</span> <a class="code" href="usart_8c.html#10edfa287366908edc4182421d00008b">usart_init_modem</a>(<span class="keyword">volatile</span> <span class="keyword">struct</span> avr32_usart_t * usart, <span class="keyword">struct</span> <a class="code" href="structusart__options__t.html">usart_options_t</a> * opt, <span class="keywordtype">long</span> cpu_hz)<a name="l00286"></a>00286 {<a name="l00287"></a>00287 <span class="keywordtype">int</span> retval;<a name="l00288"></a>00288 <a name="l00289"></a>00289 <span class="comment">/* First: Setup standard RS323 */</span>⌨️ 快捷键说明
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