| Line No. | Rev | Author | Line |
|---|---|---|---|
| 1 | 6 | kaklik | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
| 2 | <html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> |
||
| 3 | <title>Procyon AVRlib: uart.c Source File</title> |
||
| 4 | <link href="dox.css" rel="stylesheet" type="text/css"> |
||
| 5 | </head><body> |
||
| 6 | <!-- Generated by Doxygen 1.4.2 --> |
||
| 7 | <div 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> |
||
| 8 | <h1>uart.c</h1><a href="uart_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file uart.c \brief UART driver with buffer support. */</span> |
||
| 9 | 00002 <span class="comment">// *****************************************************************************</span> |
||
| 10 | 00003 <span class="comment">//</span> |
||
| 11 | 00004 <span class="comment">// File Name : 'uart.c'</span> |
||
| 12 | 00005 <span class="comment">// Title : UART driver with buffer support</span> |
||
| 13 | 00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2000-2002</span> |
||
| 14 | 00007 <span class="comment">// Created : 11/22/2000</span> |
||
| 15 | 00008 <span class="comment">// Revised : 06/09/2003</span> |
||
| 16 | 00009 <span class="comment">// Version : 1.3</span> |
||
| 17 | 00010 <span class="comment">// Target MCU : ATMEL AVR Series</span> |
||
| 18 | 00011 <span class="comment">// Editor Tabs : 4</span> |
||
| 19 | 00012 <span class="comment">//</span> |
||
| 20 | 00013 <span class="comment">// This code is distributed under the GNU Public License</span> |
||
| 21 | 00014 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span> |
||
| 22 | 00015 <span class="comment">//</span> |
||
| 23 | 00016 <span class="comment">// *****************************************************************************</span> |
||
| 24 | 00017 |
||
| 25 | 00018 <span class="preprocessor">#include <avr/io.h></span> |
||
| 26 | 00019 <span class="preprocessor">#include <avr/interrupt.h></span> |
||
| 27 | 00020 |
||
| 28 | 00021 <span class="preprocessor">#include "<a class="code" href="buffer_8h.html">buffer.h</a>"</span> |
||
| 29 | 00022 <span class="preprocessor">#include "<a class="code" href="uart_8h.html">uart.h</a>"</span> |
||
| 30 | 00023 |
||
| 31 | 00024 <span class="comment">// UART global variables</span> |
||
| 32 | 00025 <span class="comment">// flag variables</span> |
||
| 33 | <a name="l00026"></a><a class="code" href="uart_8c.html#a0">00026</a> <span class="keyword">volatile</span> u08 <a class="code" href="uart_8c.html#a0">uartReadyTx</a>; <span class="comment">///< uartReadyTx flag</span> |
||
| 34 | <a name="l00027"></a><a class="code" href="uart_8c.html#a1">00027</a> <span class="comment"></span><span class="keyword">volatile</span> u08 <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>; <span class="comment">///< uartBufferedTx flag</span> |
||
| 35 | 00028 <span class="comment"></span><span class="comment">// receive and transmit buffers</span> |
||
| 36 | <a name="l00029"></a><a class="code" href="uart_8c.html#a2">00029</a> <a class="code" href="structstruct__cBuffer.html">cBuffer</a> <a class="code" href="uart_8c.html#a2">uartRxBuffer</a>; <span class="comment">///< uart receive buffer</span> |
||
| 37 | <a name="l00030"></a><a class="code" href="uart_8c.html#a3">00030</a> <span class="comment"></span><a class="code" href="structstruct__cBuffer.html">cBuffer</a> <a class="code" href="uart_8c.html#a3">uartTxBuffer</a>; <span class="comment">///< uart transmit buffer</span> |
||
| 38 | <a name="l00031"></a><a class="code" href="uart_8c.html#a4">00031</a> <span class="comment"></span><span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> <a class="code" href="uart_8c.html#a4">uartRxOverflow</a>; <span class="comment">///< receive overflow counter</span> |
||
| 39 | 00032 <span class="comment"></span> |
||
| 40 | 00033 <span class="preprocessor">#ifndef UART_BUFFERS_EXTERNAL_RAM</span> |
||
| 41 | 00034 <span class="preprocessor"></span> <span class="comment">// using internal ram,</span> |
||
| 42 | 00035 <span class="comment">// automatically allocate space in ram for each buffer</span> |
||
| 43 | 00036 <span class="keyword">static</span> <span class="keywordtype">char</span> uartRxData[<a class="code" href="group__uart.html#ga16">UART_RX_BUFFER_SIZE</a>]; |
||
| 44 | 00037 <span class="keyword">static</span> <span class="keywordtype">char</span> uartTxData[<a class="code" href="group__uart.html#ga15">UART_TX_BUFFER_SIZE</a>]; |
||
| 45 | 00038 <span class="preprocessor">#endif</span> |
||
| 46 | 00039 <span class="preprocessor"></span> |
||
| 47 | 00040 <span class="keyword">typedef</span> void (*voidFuncPtru08)(<span class="keywordtype">unsigned</span> char); |
||
| 48 | 00041 <span class="keyword">volatile</span> <span class="keyword">static</span> voidFuncPtru08 UartRxFunc; |
||
| 49 | 00042 |
||
| 50 | 00043 <span class="comment">// enable and initialize the uart</span> |
||
| 51 | <a name="l00044"></a><a class="code" href="group__uart2.html#ga0">00044</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga0">uartInit</a>(<span class="keywordtype">void</span>) |
||
| 52 | 00045 { |
||
| 53 | 00046 <span class="comment">// initialize the buffers</span> |
||
| 54 | 00047 <a class="code" href="group__uart.html#ga1">uartInitBuffers</a>(); |
||
| 55 | 00048 <span class="comment">// initialize user receive handler</span> |
||
| 56 | 00049 UartRxFunc = 0; |
||
| 57 | 00050 |
||
| 58 | 00051 <span class="comment">// enable RxD/TxD and interrupts</span> |
||
| 59 | 00052 outb(UCR, BV(RXCIE)|BV(TXCIE)|BV(RXEN)|BV(TXEN)); |
||
| 60 | 00053 |
||
| 61 | 00054 <span class="comment">// set default baud rate</span> |
||
| 62 | 00055 <a class="code" href="group__uart.html#ga3">uartSetBaudRate</a>(<a class="code" href="group__uart.html#ga14">UART_DEFAULT_BAUD_RATE</a>); |
||
| 63 | 00056 <span class="comment">// initialize states</span> |
||
| 64 | 00057 <a class="code" href="uart_8c.html#a0">uartReadyTx</a> = TRUE; |
||
| 65 | 00058 <a class="code" href="uart_8c.html#a1">uartBufferedTx</a> = FALSE; |
||
| 66 | 00059 <span class="comment">// clear overflow count</span> |
||
| 67 | 00060 <a class="code" href="uart_8c.html#a4">uartRxOverflow</a> = 0; |
||
| 68 | 00061 <span class="comment">// enable interrupts</span> |
||
| 69 | 00062 sei(); |
||
| 70 | 00063 } |
||
| 71 | 00064 |
||
| 72 | 00065 <span class="comment">// create and initialize the uart transmit and receive buffers</span> |
||
| 73 | <a name="l00066"></a><a class="code" href="group__uart.html#ga1">00066</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga1">uartInitBuffers</a>(<span class="keywordtype">void</span>) |
||
| 74 | 00067 { |
||
| 75 | 00068 <span class="preprocessor"> #ifndef UART_BUFFERS_EXTERNAL_RAM</span> |
||
| 76 | 00069 <span class="preprocessor"></span> <span class="comment">// initialize the UART receive buffer</span> |
||
| 77 | 00070 <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartRxBuffer, uartRxData, <a class="code" href="group__uart.html#ga16">UART_RX_BUFFER_SIZE</a>); |
||
| 78 | 00071 <span class="comment">// initialize the UART transmit buffer</span> |
||
| 79 | 00072 <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartTxBuffer, uartTxData, <a class="code" href="group__uart.html#ga15">UART_TX_BUFFER_SIZE</a>); |
||
| 80 | 00073 <span class="preprocessor"> #else</span> |
||
| 81 | 00074 <span class="preprocessor"></span> <span class="comment">// initialize the UART receive buffer</span> |
||
| 82 | 00075 <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartRxBuffer, (u08*) UART_RX_BUFFER_ADDR, <a class="code" href="group__uart.html#ga16">UART_RX_BUFFER_SIZE</a>); |
||
| 83 | 00076 <span class="comment">// initialize the UART transmit buffer</span> |
||
| 84 | 00077 <a class="code" href="group__buffer.html#ga1">bufferInit</a>(&uartTxBuffer, (u08*) UART_TX_BUFFER_ADDR, <a class="code" href="group__uart.html#ga15">UART_TX_BUFFER_SIZE</a>); |
||
| 85 | 00078 <span class="preprocessor"> #endif</span> |
||
| 86 | 00079 <span class="preprocessor"></span>} |
||
| 87 | 00080 |
||
| 88 | 00081 <span class="comment">// redirects received data to a user function</span> |
||
| 89 | <a name="l00082"></a><a class="code" href="group__uart.html#ga2">00082</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga2">uartSetRxHandler</a>(<span class="keywordtype">void</span> (*rx_func)(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c)) |
||
| 90 | 00083 { |
||
| 91 | 00084 <span class="comment">// set the receive interrupt to run the supplied user function</span> |
||
| 92 | 00085 UartRxFunc = rx_func; |
||
| 93 | 00086 } |
||
| 94 | 00087 |
||
| 95 | 00088 <span class="comment">// set the uart baud rate</span> |
||
| 96 | <a name="l00089"></a><a class="code" href="group__uart.html#ga3">00089</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga3">uartSetBaudRate</a>(u32 baudrate) |
||
| 97 | 00090 { |
||
| 98 | 00091 <span class="comment">// calculate division factor for requested baud rate, and set it</span> |
||
| 99 | 00092 u16 bauddiv = ((F_CPU+(baudrate*8L))/(baudrate*16L)-1); |
||
| 100 | 00093 outb(UBRRL, bauddiv); |
||
| 101 | 00094 <span class="preprocessor"> #ifdef UBRRH</span> |
||
| 102 | 00095 <span class="preprocessor"></span> outb(UBRRH, bauddiv>>8); |
||
| 103 | 00096 <span class="preprocessor"> #endif</span> |
||
| 104 | 00097 <span class="preprocessor"></span>} |
||
| 105 | 00098 |
||
| 106 | 00099 <span class="comment">// returns the receive buffer structure </span> |
||
| 107 | <a name="l00100"></a><a class="code" href="group__uart.html#ga4">00100</a> <a class="code" href="structstruct__cBuffer.html">cBuffer</a>* <a class="code" href="group__uart.html#ga4">uartGetRxBuffer</a>(<span class="keywordtype">void</span>) |
||
| 108 | 00101 { |
||
| 109 | 00102 <span class="comment">// return rx buffer pointer</span> |
||
| 110 | 00103 <span class="keywordflow">return</span> &uartRxBuffer; |
||
| 111 | 00104 } |
||
| 112 | 00105 |
||
| 113 | 00106 <span class="comment">// returns the transmit buffer structure </span> |
||
| 114 | <a name="l00107"></a><a class="code" href="group__uart.html#ga5">00107</a> <a class="code" href="structstruct__cBuffer.html">cBuffer</a>* <a class="code" href="group__uart.html#ga5">uartGetTxBuffer</a>(<span class="keywordtype">void</span>) |
||
| 115 | 00108 { |
||
| 116 | 00109 <span class="comment">// return tx buffer pointer</span> |
||
| 117 | 00110 <span class="keywordflow">return</span> &uartTxBuffer; |
||
| 118 | 00111 } |
||
| 119 | 00112 |
||
| 120 | 00113 <span class="comment">// transmits a byte over the uart</span> |
||
| 121 | <a name="l00114"></a><a class="code" href="group__uart.html#ga6">00114</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga6">uartSendByte</a>(u08 txData) |
||
| 122 | 00115 { |
||
| 123 | 00116 <span class="comment">// wait for the transmitter to be ready</span> |
||
| 124 | 00117 <span class="keywordflow">while</span>(!<a class="code" href="uart_8c.html#a0">uartReadyTx</a>); |
||
| 125 | 00118 <span class="comment">// send byte</span> |
||
| 126 | 00119 outb(UDR, txData); |
||
| 127 | 00120 <span class="comment">// set ready state to FALSE</span> |
||
| 128 | 00121 <a class="code" href="uart_8c.html#a0">uartReadyTx</a> = FALSE; |
||
| 129 | 00122 } |
||
| 130 | 00123 |
||
| 131 | 00124 <span class="comment">// gets a single byte from the uart receive buffer (getchar-style)</span> |
||
| 132 | <a name="l00125"></a><a class="code" href="group__uart.html#ga7">00125</a> <span class="keywordtype">int</span> <a class="code" href="group__uart.html#ga7">uartGetByte</a>(<span class="keywordtype">void</span>) |
||
| 133 | 00126 { |
||
| 134 | 00127 u08 c; |
||
| 135 | 00128 <span class="keywordflow">if</span>(<a class="code" href="group__uart.html#ga8">uartReceiveByte</a>(&c)) |
||
| 136 | 00129 <span class="keywordflow">return</span> c; |
||
| 137 | 00130 <span class="keywordflow">else</span> |
||
| 138 | 00131 <span class="keywordflow">return</span> -1; |
||
| 139 | 00132 } |
||
| 140 | 00133 |
||
| 141 | 00134 <span class="comment">// gets a byte (if available) from the uart receive buffer</span> |
||
| 142 | <a name="l00135"></a><a class="code" href="group__uart.html#ga8">00135</a> u08 <a class="code" href="group__uart.html#ga8">uartReceiveByte</a>(u08* rxData) |
||
| 143 | 00136 { |
||
| 144 | 00137 <span class="comment">// make sure we have a receive buffer</span> |
||
| 145 | 00138 <span class="keywordflow">if</span>(uartRxBuffer.<a class="code" href="structstruct__cBuffer.html#o1">size</a>) |
||
| 146 | 00139 { |
||
| 147 | 00140 <span class="comment">// make sure we have data</span> |
||
| 148 | 00141 <span class="keywordflow">if</span>(uartRxBuffer.<a class="code" href="structstruct__cBuffer.html#o2">datalength</a>) |
||
| 149 | 00142 { |
||
| 150 | 00143 <span class="comment">// get byte from beginning of buffer</span> |
||
| 151 | 00144 *rxData = <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&uartRxBuffer); |
||
| 152 | 00145 <span class="keywordflow">return</span> TRUE; |
||
| 153 | 00146 } |
||
| 154 | 00147 <span class="keywordflow">else</span> |
||
| 155 | 00148 { |
||
| 156 | 00149 <span class="comment">// no data</span> |
||
| 157 | 00150 <span class="keywordflow">return</span> FALSE; |
||
| 158 | 00151 } |
||
| 159 | 00152 } |
||
| 160 | 00153 <span class="keywordflow">else</span> |
||
| 161 | 00154 { |
||
| 162 | 00155 <span class="comment">// no buffer</span> |
||
| 163 | 00156 <span class="keywordflow">return</span> FALSE; |
||
| 164 | 00157 } |
||
| 165 | 00158 } |
||
| 166 | 00159 |
||
| 167 | 00160 <span class="comment">// flush all data out of the receive buffer</span> |
||
| 168 | <a name="l00161"></a><a class="code" href="group__uart.html#ga10">00161</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga10">uartFlushReceiveBuffer</a>(<span class="keywordtype">void</span>) |
||
| 169 | 00162 { |
||
| 170 | 00163 <span class="comment">// flush all data from receive buffer</span> |
||
| 171 | 00164 <span class="comment">//bufferFlush(&uartRxBuffer);</span> |
||
| 172 | 00165 <span class="comment">// same effect as above</span> |
||
| 173 | 00166 uartRxBuffer.<a class="code" href="structstruct__cBuffer.html#o2">datalength</a> = 0; |
||
| 174 | 00167 } |
||
| 175 | 00168 |
||
| 176 | 00169 <span class="comment">// return true if uart receive buffer is empty</span> |
||
| 177 | <a name="l00170"></a><a class="code" href="group__uart.html#ga9">00170</a> u08 <a class="code" href="group__uart.html#ga9">uartReceiveBufferIsEmpty</a>(<span class="keywordtype">void</span>) |
||
| 178 | 00171 { |
||
| 179 | 00172 <span class="keywordflow">if</span>(uartRxBuffer.<a class="code" href="structstruct__cBuffer.html#o2">datalength</a> == 0) |
||
| 180 | 00173 { |
||
| 181 | 00174 <span class="keywordflow">return</span> TRUE; |
||
| 182 | 00175 } |
||
| 183 | 00176 <span class="keywordflow">else</span> |
||
| 184 | 00177 { |
||
| 185 | 00178 <span class="keywordflow">return</span> FALSE; |
||
| 186 | 00179 } |
||
| 187 | 00180 } |
||
| 188 | 00181 |
||
| 189 | 00182 <span class="comment">// add byte to end of uart Tx buffer</span> |
||
| 190 | <a name="l00183"></a><a class="code" href="group__uart.html#ga11">00183</a> u08 <a class="code" href="group__uart.html#ga11">uartAddToTxBuffer</a>(u08 data) |
||
| 191 | 00184 { |
||
| 192 | 00185 <span class="comment">// add data byte to the end of the tx buffer</span> |
||
| 193 | 00186 <span class="keywordflow">return</span> <a class="code" href="group__buffer.html#ga5">bufferAddToEnd</a>(&uartTxBuffer, data); |
||
| 194 | 00187 } |
||
| 195 | 00188 |
||
| 196 | 00189 <span class="comment">// start transmission of the current uart Tx buffer contents</span> |
||
| 197 | <a name="l00190"></a><a class="code" href="group__uart.html#ga12">00190</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga12">uartSendTxBuffer</a>(<span class="keywordtype">void</span>) |
||
| 198 | 00191 { |
||
| 199 | 00192 <span class="comment">// turn on buffered transmit</span> |
||
| 200 | 00193 <a class="code" href="uart_8c.html#a1">uartBufferedTx</a> = TRUE; |
||
| 201 | 00194 <span class="comment">// send the first byte to get things going by interrupts</span> |
||
| 202 | 00195 <a class="code" href="group__uart.html#ga6">uartSendByte</a>(<a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&uartTxBuffer)); |
||
| 203 | 00196 } |
||
| 204 | 00197 <span class="comment">/*</span> |
||
| 205 | 00198 <span class="comment">// transmit nBytes from buffer out the uart</span> |
||
| 206 | 00199 <span class="comment">u08 uartSendBuffer(char *buffer, u16 nBytes)</span> |
||
| 207 | 00200 <span class="comment">{</span> |
||
| 208 | 00201 <span class="comment"> register u08 first;</span> |
||
| 209 | 00202 <span class="comment"> register u16 i;</span> |
||
| 210 | 00203 <span class="comment"></span> |
||
| 211 | 00204 <span class="comment"> // check if there's space (and that we have any bytes to send at all)</span> |
||
| 212 | 00205 <span class="comment"> if((uartTxBuffer.datalength + nBytes < uartTxBuffer.size) && nBytes)</span> |
||
| 213 | 00206 <span class="comment"> {</span> |
||
| 214 | 00207 <span class="comment"> // grab first character</span> |
||
| 215 | 00208 <span class="comment"> first = *buffer++;</span> |
||
| 216 | 00209 <span class="comment"> // copy user buffer to uart transmit buffer</span> |
||
| 217 | 00210 <span class="comment"> for(i = 0; i < nBytes-1; i++)</span> |
||
| 218 | 00211 <span class="comment"> {</span> |
||
| 219 | 00212 <span class="comment"> // put data bytes at end of buffer</span> |
||
| 220 | 00213 <span class="comment"> bufferAddToEnd(&uartTxBuffer, *buffer++);</span> |
||
| 221 | 00214 <span class="comment"> }</span> |
||
| 222 | 00215 <span class="comment"></span> |
||
| 223 | 00216 <span class="comment"> // send the first byte to get things going by interrupts</span> |
||
| 224 | 00217 <span class="comment"> uartBufferedTx = TRUE;</span> |
||
| 225 | 00218 <span class="comment"> uartSendByte(first);</span> |
||
| 226 | 00219 <span class="comment"> // return success</span> |
||
| 227 | 00220 <span class="comment"> return TRUE;</span> |
||
| 228 | 00221 <span class="comment"> }</span> |
||
| 229 | 00222 <span class="comment"> else</span> |
||
| 230 | 00223 <span class="comment"> {</span> |
||
| 231 | 00224 <span class="comment"> // return failure</span> |
||
| 232 | 00225 <span class="comment"> return FALSE;</span> |
||
| 233 | 00226 <span class="comment"> }</span> |
||
| 234 | 00227 <span class="comment">}</span> |
||
| 235 | 00228 <span class="comment">*/</span> |
||
| 236 | 00229 <span class="comment">// UART Transmit Complete Interrupt Handler</span> |
||
| 237 | 00230 <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART_TRANS) |
||
| 238 | 00231 { |
||
| 239 | 00232 <span class="comment">// check if buffered tx is enabled</span> |
||
| 240 | 00233 <span class="keywordflow">if</span>(<a class="code" href="uart_8c.html#a1">uartBufferedTx</a>) |
||
| 241 | 00234 { |
||
| 242 | 00235 <span class="comment">// check if there's data left in the buffer</span> |
||
| 243 | 00236 <span class="keywordflow">if</span>(uartTxBuffer.<a class="code" href="structstruct__cBuffer.html#o2">datalength</a>) |
||
| 244 | 00237 { |
||
| 245 | 00238 <span class="comment">// send byte from top of buffer</span> |
||
| 246 | 00239 outb(UDR, <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&uartTxBuffer)); |
||
| 247 | 00240 } |
||
| 248 | 00241 <span class="keywordflow">else</span> |
||
| 249 | 00242 { |
||
| 250 | 00243 <span class="comment">// no data left</span> |
||
| 251 | 00244 <a class="code" href="uart_8c.html#a1">uartBufferedTx</a> = FALSE; |
||
| 252 | 00245 <span class="comment">// return to ready state</span> |
||
| 253 | 00246 <a class="code" href="uart_8c.html#a0">uartReadyTx</a> = TRUE; |
||
| 254 | 00247 } |
||
| 255 | 00248 } |
||
| 256 | 00249 <span class="keywordflow">else</span> |
||
| 257 | 00250 { |
||
| 258 | 00251 <span class="comment">// we're using single-byte tx mode</span> |
||
| 259 | 00252 <span class="comment">// indicate transmit complete, back to ready</span> |
||
| 260 | 00253 <a class="code" href="uart_8c.html#a0">uartReadyTx</a> = TRUE; |
||
| 261 | 00254 } |
||
| 262 | 00255 } |
||
| 263 | 00256 |
||
| 264 | 00257 <span class="comment">// UART Receive Complete Interrupt Handler</span> |
||
| 265 | 00258 <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART_RECV) |
||
| 266 | 00259 { |
||
| 267 | 00260 u08 c; |
||
| 268 | 00261 |
||
| 269 | 00262 <span class="comment">// get received char</span> |
||
| 270 | 00263 c = inb(UDR); |
||
| 271 | 00264 |
||
| 272 | 00265 <span class="comment">// if there's a user function to handle this receive event</span> |
||
| 273 | 00266 <span class="keywordflow">if</span>(UartRxFunc) |
||
| 274 | 00267 { |
||
| 275 | 00268 <span class="comment">// call it and pass the received data</span> |
||
| 276 | 00269 UartRxFunc(c); |
||
| 277 | 00270 } |
||
| 278 | 00271 <span class="keywordflow">else</span> |
||
| 279 | 00272 { |
||
| 280 | 00273 <span class="comment">// otherwise do default processing</span> |
||
| 281 | 00274 <span class="comment">// put received char in buffer</span> |
||
| 282 | 00275 <span class="comment">// check if there's space</span> |
||
| 283 | 00276 <span class="keywordflow">if</span>( !<a class="code" href="group__buffer.html#ga5">bufferAddToEnd</a>(&uartRxBuffer, c) ) |
||
| 284 | 00277 { |
||
| 285 | 00278 <span class="comment">// no space in buffer</span> |
||
| 286 | 00279 <span class="comment">// count overflow</span> |
||
| 287 | 00280 <a class="code" href="uart_8c.html#a4">uartRxOverflow</a>++; |
||
| 288 | 00281 } |
||
| 289 | 00282 } |
||
| 290 | 00283 } |
||
| 291 | </pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:08 2006 for Procyon AVRlib by |
||
| 292 | <a href="http://www.doxygen.org/index.html"> |
||
| 293 | <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address> |
||
| 294 | </body> |
||
| 295 | </html> |
Powered by WebSVN v2.8.3