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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Procyon ARMlib-LPC2100: ft245.c Source File</title><link href="dox.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.6 --><div class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="globals.html">Globals</a></div><h1>ft245.c</h1><a href="ft245_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <span class="comment">/*! \file ft245.c \brief FTDI FT245 USB Inferface Driver Library. */</span>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'ft245.c'</span>00005 <span class="comment">// Title : FTDI FT245 USB Inferface Driver Library</span>00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2004</span>00007 <span class="comment">// Created : 2004.02.10</span>00008 <span class="comment">// Revised : 2004.02.19</span>00009 <span class="comment">// Version : 0.1</span>00010 <span class="comment">// Target MCU : Atmel AVR Series</span>00011 <span class="comment">// Editor Tabs : 4</span>00012 <span class="comment">//</span>00013 <span class="comment">// NOTE: This code is currently below version 1.0, and therefore is considered</span>00014 <span class="comment">// to be lacking in some functionality or documentation, or may not be fully</span>00015 <span class="comment">// tested. Nonetheless, you can expect most functions to work.</span>00016 <span class="comment">//</span>00017 <span class="comment">// This code is distributed under the GNU Public License</span>00018 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>00019 <span class="comment">//</span>00020 <span class="comment">//*****************************************************************************</span>00021 00022 <span class="preprocessor">#include "lpc210x.h"</span>00023 <span class="comment">//#include <avr/io.h></span>00024 <span class="comment">//#include <avr/signal.h></span>00025 <span class="comment">//#include <avr/interrupt.h></span>00026 00027 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>00028 <span class="preprocessor">#include "<a class="code" href="timer_8h.html">timer.h</a>"</span>00029 <span class="preprocessor">#include "<a class="code" href="membus_8h.html">membus.h</a>"</span>00030 <span class="preprocessor">#include "<a class="code" href="ft245_8h.html">ft245.h</a>"</span>00031 00032 <span class="comment">// global variables</span>00033 <span class="keyword">static</span> <span class="keywordtype">char</span> ft245RxData[FT245_RX_BUFFER_SIZE];00034 cBuffer ft245RxBuffer;00035 00036 <span class="comment">// Functions</span>00037 <span class="keywordtype">void</span> ft245Init(<span class="keywordtype">void</span>)00038 {00039 <span class="preprocessor">#ifdef FT245_PORT_INTERFACE</span>00040 <span class="preprocessor"></span> <span class="comment">// initialize port pins</span>00041 <span class="comment">// configure input pins</span>00042 cbi(FT245_CTRL_DDR, FT245_TXE);00043 cbi(FT245_CTRL_DDR, FT245_RXF);00044 <span class="comment">//cbi(FT245_CTRL_DDR, FT245_SUSPEND);</span>00045 <span class="comment">// use pullups</span>00046 sbi(FT245_CTRL_PORT, FT245_TXE);00047 sbi(FT245_CTRL_PORT, FT245_RXF);00048 <span class="comment">//sbi(FT245_CTRL_PORT, FT245_SUSPEND);</span>00049 00050 <span class="comment">// configure output pins</span>00051 sbi(FT245_CTRL_DDR, FT245_RESET);00052 sbi(FT245_CTRL_DDR, FT245_WR);00053 sbi(FT245_CTRL_DDR, FT245_RD);00054 <span class="comment">// preset the outputs</span>00055 sbi(FT245_CTRL_PORT, FT245_RESET);00056 cbi(FT245_CTRL_PORT, FT245_WR);00057 sbi(FT245_CTRL_PORT, FT245_RD);00058 00059 <span class="comment">// configure data bus</span>00060 outb(FT245_DATA_DDR, 0x00);00061 outb(FT245_DATA_PORT, 0xFF);00062 <span class="preprocessor">#endif</span>00063 <span class="preprocessor"></span><span class="preprocessor">#ifdef FT245_PORT_INTERFACE</span>00064 <span class="preprocessor"></span> <span class="comment">// initialize the memory bus</span>00065 membusInit();00066 <span class="comment">// configure status pins</span>00067 IODIR &= FT245_TXE;00068 IODIR &= FT245_RXF;00069 <span class="preprocessor">#endif</span>00070 <span class="preprocessor"></span> <span class="comment">// initialize the RX buffer</span>00071 <a class="code" href="buffer_8h.html#a1">bufferInit</a>(&ft245RxBuffer, ft245RxData, FT245_RX_BUFFER_SIZE);00072 00073 <span class="comment">// reset the FT245</span>00074 <span class="comment">//ft245Reset();</span>00075 00076 }00077 00078 <span class="keywordtype">void</span> ft245Reset(<span class="keywordtype">void</span>)00079 {00080 <span class="preprocessor">#ifdef FT245_PORT_INTERFACE</span>00081 <span class="preprocessor"></span> <span class="comment">// activate reset line</span>00082 cbi(FT245_CTRL_PORT, FT245_RESET);00083 <span class="comment">// hold for 1ms</span>00084 timerPause(1);00085 <span class="comment">// release reset</span>00086 sbi(FT245_CTRL_PORT, FT245_RESET);00087 <span class="preprocessor">#endif</span>00088 <span class="preprocessor"></span><span class="preprocessor">#ifdef FT245_MEMBUS_INTERFACE</span>00089 <span class="preprocessor"></span>00090 <span class="preprocessor">#endif</span>00091 <span class="preprocessor"></span>}00092 00093 u08 ft245ReadByte(<span class="keywordtype">void</span>)00094 {00095 <span class="preprocessor">#ifdef FT245_PORT_INTERFACE</span>00096 <span class="preprocessor"></span> u08 data;00097 <span class="comment">// data bus set for input</span>00098 outb(FT245_DATA_DDR, 0x00);00099 <span class="comment">// assert RD line</span>00100 cbi(FT245_CTRL_PORT, FT245_RD);00101 <span class="comment">// wait</span>00102 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"nop"</span>);00103 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"nop"</span>);00104 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"nop"</span>);00105 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"nop"</span>);00106 <span class="comment">// read data</span>00107 data = inb(FT245_DATA_PORTIN);00108 <span class="comment">// release RD line</span>00109 sbi(FT245_CTRL_PORT, FT245_RD);00110 <span class="comment">// return data</span>00111 <span class="keywordflow">return</span> data;00112 <span class="preprocessor">#endif</span>00113 <span class="preprocessor"></span><span class="preprocessor">#ifdef FT245_MEMBUS_INTERFACE</span>00114 <span class="preprocessor"></span> <span class="keywordflow">return</span> membusRead(FT245_BASE_ADDRESS);00115 <span class="preprocessor">#endif</span>00116 <span class="preprocessor"></span>}00117 00118 <span class="keywordtype">void</span> ft245WriteByte(u08 data)00119 {00120 <span class="preprocessor">#ifdef FT245_PORT_INTERFACE</span>00121 <span class="preprocessor"></span> <span class="comment">// wait for transmit fifo to be ready</span>00122 <span class="keywordflow">while</span>(!ft245CheckTxFifo());00123 <span class="comment">// assert WR line</span>00124 sbi(FT245_CTRL_PORT, FT245_WR);00125 <span class="comment">// data bus set for output</span>00126 outb(FT245_DATA_DDR, 0xFF);00127 <span class="comment">// write data</span>00128 outb(FT245_DATA_PORT, data);00129 <span class="comment">// wait</span>00130 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"nop"</span>);00131 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"nop"</span>);00132 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"nop"</span>);00133 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"nop"</span>);00134 <span class="comment">// release WR line</span>00135 cbi(FT245_CTRL_PORT, FT245_WR);00136 <span class="comment">// return data bus to input + pullups</span>00137 outb(FT245_DATA_DDR, 0x00);00138 outb(FT245_DATA_PORT, 0xFF);00139 <span class="preprocessor">#endif</span>00140 <span class="preprocessor"></span><span class="preprocessor">#ifdef FT245_MEMBUS_INTERFACE</span>00141 <span class="preprocessor"></span> <span class="keywordflow">return</span> membusWrite(FT245_BASE_ADDRESS, data);00142 <span class="preprocessor">#endif</span>00143 <span class="preprocessor"></span>}00144 00145 u08 ft245CheckRxFifo(<span class="keywordtype">void</span>)00146 {00147 <span class="comment">// check state of RXF line</span>00148 <span class="comment">// RXF = L => Data in fifo ready to be read</span>00149 <span class="comment">// RXF = H => No data, or not ready</span>00150 <span class="preprocessor">#ifdef FT245_PORT_INTERFACE</span>00151 <span class="preprocessor"></span> <span class="keywordflow">if</span>( inb(FT245_CTRL_PORTIN) & (1<<FT245_RXF) )00152 <span class="keywordflow">return</span> FALSE; <span class="comment">// no data</span>00153 <span class="keywordflow">else</span>00154 <span class="keywordflow">return</span> TRUE; <span class="comment">// data is available</span>00155 <span class="preprocessor">#endif</span>00156 <span class="preprocessor"></span><span class="preprocessor">#ifdef FT245_MEMBUS_INTERFACE</span>00157 <span class="preprocessor"></span> <span class="keywordflow">if</span>(IOPIN & FT245_RXF)00158 <span class="keywordflow">return</span> FALSE; <span class="comment">// no data</span>00159 <span class="keywordflow">else</span>00160 <span class="keywordflow">return</span> TRUE; <span class="comment">// data is available</span>00161 <span class="preprocessor">#endif</span>00162 <span class="preprocessor"></span>}00163 00164 u08 ft245CheckTxFifo(<span class="keywordtype">void</span>)00165 {00166 <span class="comment">// check state of TXE line</span>00167 <span class="comment">// TXE = L => Tx fifo is ready to be written</span>00168 <span class="comment">// TXE = H => Tx fifo full or not ready</span>00169 <span class="preprocessor">#ifdef FT245_PORT_INTERFACE</span>00170 <span class="preprocessor"></span> <span class="keywordflow">if</span>( inb(FT245_CTRL_PORTIN) & (1<<FT245_TXE) )00171 <span class="keywordflow">return</span> FALSE; <span class="comment">// full or not ready</span>00172 <span class="keywordflow">else</span>00173 <span class="keywordflow">return</span> TRUE; <span class="comment">// tx fifo space is available</span>00174 <span class="preprocessor">#endif</span>00175 <span class="preprocessor"></span><span class="preprocessor">#ifdef FT245_MEMBUS_INTERFACE</span>00176 <span class="preprocessor"></span> <span class="keywordflow">if</span>(IOPIN & FT245_TXE)00177 <span class="keywordflow">return</span> FALSE; <span class="comment">// full or not ready</span>00178 <span class="keywordflow">else</span>00179 <span class="keywordflow">return</span> TRUE; <span class="comment">// tx fifo space is available</span>00180 <span class="preprocessor">#endif</span>00181 <span class="preprocessor"></span>}00182 00183 <span class="comment">/*</span>00184 <span class="comment">u08 ft245IsSuspended(void)</span>00185 <span class="comment">{</span>00186 <span class="comment"> // check state of SUSPEND line</span>00187 <span class="comment"> // SUSPEND = L => Data in fifo ready to be read</span>00188 <span class="comment"> // SUSPEND = H => No data, or not ready</span>00189 <span class="comment"> if( inb(FT245_CTRL_PORTIN) & (1<<FT245_RXF) )</span>00190 <span class="comment"> return FALSE; // no data</span>00191 <span class="comment"> else</span>00192 <span class="comment"> return TRUE; // data is available</span>00193 <span class="comment">}</span>00194 <span class="comment">*/</span>00195 00196 cBuffer* ft245GetRxBuffer(<span class="keywordtype">void</span>)00197 {00198 <span class="comment">// since there is an internal buffer in the FT245 chip</span>00199 <span class="comment">// we don't read in bytes immediately on reception.</span>00200 <span class="comment">// instead, the FT245 buffer is read in when the </span>00201 <span class="comment">// receive buffer is requested</span>00202 00203 <span class="comment">// read in receive buffer</span>00204 <span class="keywordflow">while</span>(ft245CheckRxFifo())00205 {00206 <a class="code" href="buffer_8h.html#a5">bufferAddToEnd</a>(&ft245RxBuffer, ft245ReadByte());00207 }00208 00209 <span class="keywordflow">return</span> &ft245RxBuffer;00210 }</pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 13 03:38:11 2004 for Procyon ARMlib-LPC2100 by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.6 </small></address></body></html>⌨️ 快捷键说明
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