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<!DOCTYPE <h <t <link </head><body> <!-- <div <h 00002 00003 00004 00005 00006 00007 00008 00009 00010 00011 00012 00013 00014 00015 00016 00017 00018 00019 00020 00021 00022 00023 00024 00025 00026 00027 00028 00029 00030 00031 00032 00033 00034 00035 00036 00037 00038 00039 00040 00041 00042 00043 00044 00045 00046 <a 00048 { 00049 00050 00051 00052 } 00053 <a 00055 { 00056 00057 00058 00059 00060 00061 00062 00063 00064 00065 00066 00067 00068 00069 00070 sei(); 00071 } 00072 <a 00074 { 00075 00076 00077 00078 00079 00080 00081 00082 00083 00084 00085 00086 00087 00088 00089 sei(); 00090 } 00091 <a 00093 { 00094 00095 00096 00097 00098 00099 00100 00101 00102 00103 00104 00105 00106 { 00107 00108 00109 00110 00111 00112 00113 00114 00115 00116 00117 <a 00119 { 00120 00121 00122 { 00123 00124 00125 } 00126 } 00127 <a 00129 { 00130 00131 00132 00133 { 00134 00135 00136 00137 00138 00139 00140 { 00141 00142 00143 00144 00145 00146 } 00147 <a 00149 { 00150 00151 00152 } 00153 <a 00155 { 00156 00157 00158 } 00159 <a 00161 { 00162 00163 00164 00165 00166 { 00167 00168 00169 } 00170 00171 { 00172 00173 00174 } 00175 00176 00177 } 00178 <a 00180 { 00181 00182 00183 } 00184 00185 00186 { 00187 00188 00189 } 00190 <a 00192 { 00193 00194 u08 c; 00195 00196 00197 00198 00199 } 00200 00201 00202 { 00203 00204 u08 c; 00205 00206 00207 00208 00209 } 00210 00211 <a 00213 { 00214 00215 00216 { 00217 00218 00219 { 00220 00221 00222 00223 } 00224 00225 00226 } 00227 00228 00229 } 00230 <a 00232 { 00233 00234 00235 } 00236 <a 00238 { 00239 00240 } 00241 <a 00243 { 00244 00245 00246 } 00247 <a 00249 { 00250 00251 } 00252 00253 00254 { 00255 00256 } 00257 <a 00259 { 00260 00261 00262 00263 00264 } 00265 <a 00267 { 00268 00269 00270 00271 00272 00273 { 00274 00275 00276 00277 00278 { 00279 00280 00281 } 00282 00283 00284 00285 00286 00287 00288 } 00289 00290 { 00291 00292 00293 } 00294 } 00295 00296 <a 00298 { 00299 00300 00301 { 00302 00303 00304 { 00305 00306 00307 00308 00309 00310 } 00311 00312 { 00313 00314 00315 00316 00317 } 00318 } 00319 00320 { 00321 00322 00323 00324 } 00325 } 00326 00327 00328 00329 { 00330 u08 c; 00331 00332 00333 00334 00335 00336 00337 00338 00339 { 00340 00341 00342 } 00343 00344 { 00345 00346 00347 00348 00349 { 00350 00351 00352 00353 } 00354 } 00355 } 00356 00357 00358 { 00359 00360 00361 } 00362 00363 00364 { 00365 00366 00367 } 00368 00369 00370 { 00371 00372 00373 } 00374 00375 00376 { 00377 00378 00379 } </ <a <img </body> </html>

HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> tml><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> itle>Procyon AVRlib: uart2.c Source File</title> href="dox.css" rel="stylesheet" type="text/css"> Generated by Doxygen 1.4.2 --> class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related Pages</a></div> 1>uart2.c</h1><a href="uart2_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 /*! \file uart2.c \brief Dual UART driver with buffer support. */ //***************************************************************************** // // File Name : 'uart2.c' // Title : Dual UART driver with buffer support // Author : Pascal Stang - Copyright (C) 2000-2004 // Created : 11/20/2000 // Revised : 07/04/2004 // Version : 1.0 // Target MCU : ATMEL AVR Series // Editor Tabs : 4 // // Description : This is a UART driver for AVR-series processors with two // hardware UARTs such as the mega161 and mega128 // // This code is distributed under the GNU Public License // which can be found at http://www.gnu.org/licenses/gpl.txt // //***************************************************************************** #include <avr/io.h> #include <avr/interrupt.h> #include "<a class="code" href="buffer_8h.html">buffer.h</a>" #include "<a class="code" href="uart2_8h.html">uart2.h</a>" // UART global variables // flag variables volatile u08 <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[2]; volatile u08 <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[2]; // receive and transmit buffers <a class="code" href="structstruct__cBuffer.html">cBuffer</a> <a class="code" href="uart_8c.html#a2">uartRxBuffer</a>[2]; <a class="code" href="structstruct__cBuffer.html">cBuffer</a> <a class="code" href="uart_8c.html#a3">uartTxBuffer</a>[2]; unsigned short <a class="code" href="uart_8c.html#a4">uartRxOverflow</a>[2]; #ifndef UART_BUFFER_EXTERNAL_RAM // using internal ram, // automatically allocate space in ram for each buffer static char uart0RxData[<a class="code" href="group__uart2.html#ga27">UART0_RX_BUFFER_SIZE</a>]; static char uart0TxData[<a class="code" href="group__uart2.html#ga26">UART0_TX_BUFFER_SIZE</a>]; static char uart1RxData[<a class="code" href="group__uart2.html#ga29">UART1_RX_BUFFER_SIZE</a>]; static char uart1TxData[<a class="code" href="group__uart2.html#ga28">UART1_TX_BUFFER_SIZE</a>]; #endif typedef void (*voidFuncPtru08)(unsigned char); volatile static voidFuncPtru08 UartRxFunc[2]; name="l00047"></a><a class="code" href="group__uart.html#ga0">00047</a> void <a class="code" href="group__uart.html#ga0">uartInit</a>(void) // initialize both uarts <a class="code" href="group__uart2.html#ga1">uart0Init</a>(); <a class="code" href="group__uart2.html#ga2">uart1Init</a>(); name="l00054"></a><a class="code" href="group__uart2.html#ga1">00054</a> void <a class="code" href="group__uart2.html#ga1">uart0Init</a>(void) // initialize the buffers <a class="code" href="group__uart2.html#ga3">uart0InitBuffers</a>(); // initialize user receive handlers UartRxFunc[0] = 0; // enable RxD/TxD and interrupts outb(UCSR0B, BV(RXCIE)|BV(TXCIE)|BV(RXEN)|BV(TXEN)); // set default baud rate <a class="code" href="group__uart.html#ga3">uartSetBaudRate</a>(0, <a class="code" href="group__uart2.html#ga24">UART0_DEFAULT_BAUD_RATE</a>); // initialize states <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[0] = TRUE; <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[0] = FALSE; // clear overflow count <a class="code" href="uart_8c.html#a4">uartRxOverflow</a>[0] = 0; // enable interrupts name="l00073"></a><a class="code" href="group__uart2.html#ga2">00073</a> void <a class="code" href="group__uart2.html#ga2">uart1Init</a>(void) // initialize the buffers uart1InitBuffers(); // initialize user receive handlers UartRxFunc[1] = 0; // enable RxD/TxD and interrupts outb(UCSR1B, BV(RXCIE)|BV(TXCIE)|BV(RXEN)|BV(TXEN)); // set default baud rate <a class="code" href="group__uart.html#ga3">uartSetBaudRate</a>(1, <a class="code" href="group__uart2.html#ga25">UART1_DEFAULT_BAUD_RATE</a>); // initialize states <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[1] = TRUE; <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[1] = FALSE; // clear overflow count <a class="code" href="uart_8c.html#a4">uartRxOverflow</a>[1] = 0; // enable interrupts name="l00092"></a><a class="code" href="group__uart2.html#ga3">00092</a> void <a class="code" href="group__uart2.html#ga3">uart0InitBuffers</a>(void) #ifndef UART_BUFFER_EXTERNAL_RAM // initialize the UART0 buffers <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartRxBuffer[0], uart0RxData, <a class="code" href="group__uart2.html#ga27">UART0_RX_BUFFER_SIZE</a>); <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartTxBuffer[0], uart0TxData, <a class="code" href="group__uart2.html#ga26">UART0_TX_BUFFER_SIZE</a>); #else // initialize the UART0 buffers <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartRxBuffer[0], (u08*) UART0_RX_BUFFER_ADDR, <a class="code" href="group__uart2.html#ga27">UART0_RX_BUFFER_SIZE</a>); <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartTxBuffer[0], (u08*) UART0_TX_BUFFER_ADDR, <a class="code" href="group__uart2.html#ga26">UART0_TX_BUFFER_SIZE</a>); #endif } void uart1InitBuffers(void) #ifndef UART_BUFFER_EXTERNAL_RAM // initialize the UART1 buffers <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartRxBuffer[1], uart1RxData, <a class="code" href="group__uart2.html#ga29">UART1_RX_BUFFER_SIZE</a>); <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartTxBuffer[1], uart1TxData, <a class="code" href="group__uart2.html#ga28">UART1_TX_BUFFER_SIZE</a>); #else // initialize the UART1 buffers <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartRxBuffer[1], (u08*) UART1_RX_BUFFER_ADDR, <a class="code" href="group__uart2.html#ga29">UART1_RX_BUFFER_SIZE</a>); <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartTxBuffer[1], (u08*) UART1_TX_BUFFER_ADDR, <a class="code" href="group__uart2.html#ga28">UART1_TX_BUFFER_SIZE</a>); #endif } name="l00118"></a><a class="code" href="group__uart2.html#ga5">00118</a> void <a class="code" href="group__uart.html#ga2">uartSetRxHandler</a>(u08 nUart, void (*rx_func)(unsigned char c)) // make sure the uart number is within bounds if(nUart < 2) // set the receive interrupt to run the supplied user function UartRxFunc[nUart] = rx_func; name="l00128"></a><a class="code" href="group__uart2.html#ga6">00128</a> void <a class="code" href="group__uart.html#ga3">uartSetBaudRate</a>(u08 nUart, u32 baudrate) // calculate division factor for requested baud rate, and set it u16 bauddiv = ((F_CPU+(baudrate*8L))/(baudrate*16L)-1); if(nUart) outb(UBRR1L, bauddiv); #ifdef UBRR1H outb(UBRR1H, bauddiv>>8); #endif } else outb(UBRR0L, bauddiv); #ifdef UBRR0H outb(UBRR0H, bauddiv>>8); #endif } name="l00148"></a><a class="code" href="group__uart2.html#ga7">00148</a> <a class="code" href="structstruct__cBuffer.html">cBuffer</a>* <a class="code" href="group__uart.html#ga4">uartGetRxBuffer</a>(u08 nUart) // return rx buffer pointer return &uartRxBuffer[nUart]; name="l00154"></a><a class="code" href="group__uart2.html#ga8">00154</a> <a class="code" href="structstruct__cBuffer.html">cBuffer</a>* <a class="code" href="group__uart.html#ga5">uartGetTxBuffer</a>(u08 nUart) // return tx buffer pointer return &uartTxBuffer[nUart]; name="l00160"></a><a class="code" href="group__uart2.html#ga9">00160</a> void <a class="code" href="group__uart.html#ga6">uartSendByte</a>(u08 nUart, u08 txData) // wait for the transmitter to be ready // while(!uartReadyTx[nUart]); // send byte if(nUart) while(!(UCSR1A & (1<<UDRE))); outb(UDR1, txData); else while(!(UCSR0A & (1<<UDRE))); outb(UDR0, txData); // set ready state to FALSE <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[nUart] = FALSE; name="l00179"></a><a class="code" href="group__uart2.html#ga10">00179</a> void <a class="code" href="group__uart2.html#ga10">uart0SendByte</a>(u08 data) // send byte on UART0 <a class="code" href="group__uart.html#ga6">uartSendByte</a>(0, data); void uart1SendByte(u08 data) // send byte on UART1 <a class="code" href="group__uart.html#ga6">uartSendByte</a>(1, data); name="l00191"></a><a class="code" href="group__uart2.html#ga12">00191</a> int <a class="code" href="group__uart2.html#ga12">uart0GetByte</a>(void) // get single byte from receive buffer (if available) if(<a class="code" href="group__uart.html#ga8">uartReceiveByte</a>(0,&c)) return c; else return -1; int uart1GetByte(void) // get single byte from receive buffer (if available) if(<a class="code" href="group__uart.html#ga8">uartReceiveByte</a>(1,&c)) return c; else return -1; name="l00212"></a><a class="code" href="group__uart2.html#ga14">00212</a> u08 <a class="code" href="group__uart.html#ga8">uartReceiveByte</a>(u08 nUart, u08* rxData) // make sure we have a receive buffer if(uartRxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o1">size</a>) // make sure we have data if(uartRxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o2">datalength</a>) // get byte from beginning of buffer *rxData = <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&uartRxBuffer[nUart]); return TRUE; else return FALSE; // no data else return FALSE; // no buffer name="l00231"></a><a class="code" href="group__uart2.html#ga16">00231</a> void <a class="code" href="group__uart.html#ga10">uartFlushReceiveBuffer</a>(u08 nUart) // flush all data from receive buffer <a class="code" href="group__buffer.html#ga7">bufferFlush</a>(&uartRxBuffer[nUart]); name="l00237"></a><a class="code" href="group__uart2.html#ga15">00237</a> u08 <a class="code" href="group__uart.html#ga9">uartReceiveBufferIsEmpty</a>(u08 nUart) return (uartRxBuffer[nUart].datalength == 0); name="l00242"></a><a class="code" href="group__uart2.html#ga17">00242</a> void <a class="code" href="group__uart.html#ga11">uartAddToTxBuffer</a>(u08 nUart, u08 data) // add data byte to the end of the tx buffer <a class="code" href="group__buffer.html#ga5">bufferAddToEnd</a>(&uartTxBuffer[nUart], data); name="l00248"></a><a class="code" href="group__uart2.html#ga18">00248</a> void <a class="code" href="group__uart2.html#ga18">uart0AddToTxBuffer</a>(u08 data) <a class="code" href="group__uart.html#ga11">uartAddToTxBuffer</a>(0,data); void uart1AddToTxBuffer(u08 data) <a class="code" href="group__uart.html#ga11">uartAddToTxBuffer</a>(1,data); name="l00258"></a><a class="code" href="group__uart2.html#ga20">00258</a> void <a class="code" href="group__uart.html#ga12">uartSendTxBuffer</a>(u08 nUart) // turn on buffered transmit <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart] = TRUE; // send the first byte to get things going by interrupts <a class="code" href="group__uart.html#ga6">uartSendByte</a>(nUart, <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&uartTxBuffer[nUart])); name="l00266"></a><a class="code" href="group__uart2.html#ga21">00266</a> u08 <a class="code" href="group__uart.html#ga13">uartSendBuffer</a>(u08 nUart, char *buffer, u16 nBytes) register u08 first; register u16 i; // check if there's space (and that we have any bytes to send at all) if((uartTxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o2">datalength</a> + nBytes < uartTxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o1">size</a>) && nBytes) // grab first character first = *buffer++; // copy user buffer to uart transmit buffer for(i = 0; i < nBytes-1; i++) // put data bytes at end of buffer <a class="code" href="group__buffer.html#ga5">bufferAddToEnd</a>(&uartTxBuffer[nUart], *buffer++); // send the first byte to get things going by interrupts <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart] = TRUE; <a class="code" href="group__uart.html#ga6">uartSendByte</a>(nUart, first); // return success return TRUE; else // return failure return FALSE; // UART Transmit Complete Interrupt Function name="l00297"></a><a class="code" href="group__uart2.html#ga22">00297</a> void <a class="code" href="group__uart2.html#ga22">uartTransmitService</a>(u08 nUart) // check if buffered tx is enabled if(<a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart]) // check if there's data left in the buffer if(uartTxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o2">datalength</a>) // send byte from top of buffer if(nUart) outb(UDR1, <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&uartTxBuffer[1]) ); else outb(UDR0, <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&uartTxBuffer[0]) ); else // no data left <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart] = FALSE; // return to ready state <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[nUart] = TRUE; else // we're using single-byte tx mode // indicate transmit complete, back to ready <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[nUart] = TRUE; // UART Receive Complete Interrupt Function void uartReceiveService(u08 nUart) // get received char if(nUart) c = inb(UDR1); else c = inb(UDR0); // if there's a user function to handle this receive event if(UartRxFunc[nUart]) // call it and pass the received data UartRxFunc[nUart](c); else // otherwise do default processing // put received char in buffer // check if there's space if( !<a class="code" href="group__buffer.html#ga5">bufferAddToEnd</a>(&uartRxBuffer[nUart], c) ) // no space in buffer // count overflow <a class="code" href="uart_8c.html#a4">uartRxOverflow</a>[nUart]++; <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART0_TRANS) // service UART0 transmit interrupt <a class="code" href="group__uart2.html#ga22">uartTransmitService</a>(0); <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART1_TRANS) // service UART1 transmit interrupt <a class="code" href="group__uart2.html#ga22">uartTransmitService</a>(1); <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART0_RECV) // service UART0 receive interrupt uartReceiveService(0); <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART1_RECV) // service UART1 receive interrupt uartReceiveService(1); pre></div><hr size="1"><address style="align: right;">Generated on Sun Oct 29 03:41:08 2006 for Procyon AVRlib by  href="http://www.doxygen.org/index.html"> src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </address>

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