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8 <h1>mmc.c</h1><a href="mmc_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file mmc.c \brief MultiMedia and SD Flash Card Interface. */</span>
9 00002 <span class="comment">//*****************************************************************************</span>
10 00003 <span class="comment">//</span>
11 00004 <span class="comment">// File Name : 'mmc.c'</span>
12 00005 <span class="comment">// Title : MultiMedia and SD Flash Card Interface</span>
13 00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2004</span>
14 00007 <span class="comment">// Created : 2004.09.22</span>
15 00008 <span class="comment">// Revised : 2006.06.12</span>
16 00009 <span class="comment">// Version : 0.1</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">// NOTE: This code is currently below version 1.0, and therefore is considered</span>
21 00014 <span class="comment">// to be lacking in some functionality or documentation, or may not be fully</span>
22 00015 <span class="comment">// tested. Nonetheless, you can expect most functions to work.</span>
23 00016 <span class="comment">//</span>
24 00017 <span class="comment">// This code is distributed under the GNU Public License</span>
25 00018 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>
26 00019 <span class="comment">//</span>
27 00020 <span class="comment">//*****************************************************************************</span>
28 00021
29 00022 <span class="comment">//----- Include Files ---------------------------------------------------------</span>
30 00023 <span class="preprocessor">#include &lt;avr/io.h&gt;</span> <span class="comment">// include I/O definitions (port names, pin names, etc)</span>
31 00024 <span class="preprocessor">#include &lt;avr/interrupt.h&gt;</span> <span class="comment">// include interrupt support</span>
32 00025
33 00026 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span> <span class="comment">// include our global settings</span>
34 00027 <span class="preprocessor">#include "<a class="code" href="spi_8h.html">spi.h</a>"</span> <span class="comment">// include spi bus support</span>
35 00028
36 00029 <span class="preprocessor">#include "<a class="code" href="rprintf_8h.html">rprintf.h</a>"</span>
37 00030
38 00031 <span class="preprocessor">#include "<a class="code" href="mmc_8h.html">mmc.h</a>"</span>
39 00032
40 00033 <span class="comment">// include project-specific hardware configuration</span>
41 00034 <span class="preprocessor">#include "<a class="code" href="mmcconf_8h.html">mmcconf.h</a>"</span>
42 00035
43 00036 <span class="comment">// Global variables</span>
44 00037
45 00038 <span class="comment">// Functions</span>
46 00039
47 <a name="l00040"></a><a class="code" href="group__mmc.html#ga0">00040</a> <span class="keywordtype">void</span> <a class="code" href="group__mmc.html#ga0">mmcInit</a>(<span class="keywordtype">void</span>)
48 00041 {
49 00042 <span class="comment">// initialize SPI interface</span>
50 00043 spiInit();
51 00044 <span class="comment">// release chip select</span>
52 00045 sbi(MMC_CS_DDR, MMC_CS_PIN);
53 00046 sbi(MMC_CS_PORT,MMC_CS_PIN);
54 00047 }
55 00048
56 <a name="l00049"></a><a class="code" href="group__mmc.html#ga1">00049</a> u08 <a class="code" href="group__mmc.html#ga1">mmcReset</a>(<span class="keywordtype">void</span>)
57 00050 {
58 00051 u08 i;
59 00052 u08 retry;
60 00053 u08 r1=0;
61 00054
62 00055 retry = 0;
63 00056 <span class="keywordflow">do</span>
64 00057 {
65 00058 <span class="comment">// send dummy bytes with CS high before accessing</span>
66 00059 <span class="keywordflow">for</span>(i=0;i&lt;10;i++) spiTransferByte(0xFF);
67 00060 <span class="comment">// resetting card, go to SPI mode</span>
68 00061 r1 = <a class="code" href="group__mmc.html#ga2">mmcSendCommand</a>(<a class="code" href="group__mmc.html#ga6">MMC_GO_IDLE_STATE</a>, 0);
69 00062 <span class="preprocessor"> #ifdef MMC_DEBUG</span>
70 00063 <span class="preprocessor"></span> rprintf(<span class="stringliteral">"MMC_GO_IDLE_STATE: R1=0x%x\r\n"</span>, r1);
71 00064 <span class="preprocessor"> #endif</span>
72 00065 <span class="preprocessor"></span> <span class="comment">// do retry counter</span>
73 00066 retry++;
74 00067 <span class="keywordflow">if</span>(retry&gt;10) <span class="keywordflow">return</span> -1;
75 00068 } <span class="keywordflow">while</span>(r1 != 0x01);
76 00069
77 00070 <span class="comment">// TODO: check card parameters for voltage compliance</span>
78 00071 <span class="comment">// before issuing initialize command</span>
79 00072
80 00073 retry = 0;
81 00074 <span class="keywordflow">do</span>
82 00075 {
83 00076 <span class="comment">// initializing card for operation</span>
84 00077 r1 = <a class="code" href="group__mmc.html#ga2">mmcSendCommand</a>(<a class="code" href="group__mmc.html#ga7">MMC_SEND_OP_COND</a>, 0);
85 00078 <span class="preprocessor"> #ifdef MMC_DEBUG</span>
86 00079 <span class="preprocessor"></span> rprintf(<span class="stringliteral">"MMC_SEND_OP_COND: R1=0x%x\r\n"</span>, r1);
87 00080 <span class="preprocessor"> #endif</span>
88 00081 <span class="preprocessor"></span> <span class="comment">// do retry counter</span>
89 00082 retry++;
90 00083 <span class="keywordflow">if</span>(retry&gt;100) <span class="keywordflow">return</span> -1;
91 00084 } <span class="keywordflow">while</span>(r1);
92 00085
93 00086 <span class="comment">// turn off CRC checking to simplify communication</span>
94 00087 r1 = <a class="code" href="group__mmc.html#ga2">mmcSendCommand</a>(<a class="code" href="group__mmc.html#ga25">MMC_CRC_ON_OFF</a>, 0);
95 00088 <span class="preprocessor"> #ifdef MMC_DEBUG</span>
96 00089 <span class="preprocessor"></span> rprintf(<span class="stringliteral">"MMC_CRC_ON_OFF: R1=0x%x\r\n"</span>, r1);
97 00090 <span class="preprocessor"> #endif</span>
98 00091 <span class="preprocessor"></span>
99 00092 <span class="comment">// set block length to 512 bytes</span>
100 00093 r1 = <a class="code" href="group__mmc.html#ga2">mmcSendCommand</a>(<a class="code" href="group__mmc.html#ga11">MMC_SET_BLOCKLEN</a>, 512);
101 00094 <span class="preprocessor"> #ifdef MMC_DEBUG</span>
102 00095 <span class="preprocessor"></span> rprintf(<span class="stringliteral">"MMC_SET_BLOCKLEN: R1=0x%x\r\n"</span>, r1);
103 00096 <span class="preprocessor"> #endif</span>
104 00097 <span class="preprocessor"></span>
105 00098 <span class="comment">// return success</span>
106 00099 <span class="keywordflow">return</span> 0;
107 00100 }
108 00101
109 <a name="l00102"></a><a class="code" href="group__mmc.html#ga2">00102</a> u08 <a class="code" href="group__mmc.html#ga2">mmcSendCommand</a>(u08 cmd, u32 arg)
110 00103 {
111 00104 u08 r1;
112 00105
113 00106 <span class="comment">// assert chip select</span>
114 00107 cbi(MMC_CS_PORT,MMC_CS_PIN);
115 00108 <span class="comment">// issue the command</span>
116 00109 r1 = <a class="code" href="group__mmc.html#ga5">mmcCommand</a>(cmd, arg);
117 00110 <span class="comment">// release chip select</span>
118 00111 sbi(MMC_CS_PORT,MMC_CS_PIN);
119 00112
120 00113 <span class="keywordflow">return</span> r1;
121 00114 }
122 00115
123 <a name="l00116"></a><a class="code" href="group__mmc.html#ga3">00116</a> u08 <a class="code" href="group__mmc.html#ga3">mmcRead</a>(u32 sector, u08* buffer)
124 00117 {
125 00118 u08 r1;
126 00119 u16 i;
127 00120
128 00121 <span class="comment">// assert chip select</span>
129 00122 cbi(MMC_CS_PORT,MMC_CS_PIN);
130 00123 <span class="comment">// issue command</span>
131 00124 r1 = <a class="code" href="group__mmc.html#ga5">mmcCommand</a>(<a class="code" href="group__mmc.html#ga12">MMC_READ_SINGLE_BLOCK</a>, sector&lt;&lt;9);
132 00125 <span class="preprocessor"> #ifdef MMC_DEBUG</span>
133 00126 <span class="preprocessor"></span> rprintf(<span class="stringliteral">"MMC Read Block R1=0x%x\r\n"</span>, r1);
134 00127 <span class="preprocessor"> #endif</span>
135 00128 <span class="preprocessor"></span> <span class="comment">// check for valid response</span>
136 00129 <span class="keywordflow">if</span>(r1 != 0x00)
137 00130 <span class="keywordflow">return</span> r1;
138 00131 <span class="comment">// wait for block start</span>
139 00132 <span class="keywordflow">while</span>(spiTransferByte(0xFF) != <a class="code" href="group__mmc.html#ga34">MMC_STARTBLOCK_READ</a>);
140 00133 <span class="comment">// read in data</span>
141 00134 <span class="keywordflow">for</span>(i=0; i&lt;0x200; i++)
142 00135 {
143 00136 *buffer++ = spiTransferByte(0xFF);
144 00137 }
145 00138 <span class="comment">// read 16-bit CRC</span>
146 00139 spiTransferByte(0xFF);
147 00140 spiTransferByte(0xFF);
148 00141 <span class="comment">// release chip select</span>
149 00142 sbi(MMC_CS_PORT,MMC_CS_PIN);
150 00143 <span class="comment">// return success</span>
151 00144 <span class="keywordflow">return</span> 0;
152 00145 }
153 00146
154 <a name="l00147"></a><a class="code" href="group__mmc.html#ga4">00147</a> u08 <a class="code" href="group__mmc.html#ga4">mmcWrite</a>(u32 sector, u08* buffer)
155 00148 {
156 00149 u08 r1;
157 00150 u16 i;
158 00151
159 00152 <span class="comment">// assert chip select</span>
160 00153 cbi(MMC_CS_PORT,MMC_CS_PIN);
161 00154 <span class="comment">// issue command</span>
162 00155 r1 = <a class="code" href="group__mmc.html#ga5">mmcCommand</a>(<a class="code" href="group__mmc.html#ga13">MMC_WRITE_BLOCK</a>, sector&lt;&lt;9);
163 00156 <span class="preprocessor"> #ifdef MMC_DEBUG</span>
164 00157 <span class="preprocessor"></span> rprintf(<span class="stringliteral">"MMC Write Block R1=0x%x\r\n"</span>, r1);
165 00158 <span class="preprocessor"> #endif</span>
166 00159 <span class="preprocessor"></span> <span class="comment">// check for valid response</span>
167 00160 <span class="keywordflow">if</span>(r1 != 0x00)
168 00161 <span class="keywordflow">return</span> r1;
169 00162 <span class="comment">// send dummy</span>
170 00163 spiTransferByte(0xFF);
171 00164 <span class="comment">// send data start token</span>
172 00165 spiTransferByte(<a class="code" href="group__mmc.html#ga35">MMC_STARTBLOCK_WRITE</a>);
173 00166 <span class="comment">// write data</span>
174 00167 <span class="keywordflow">for</span>(i=0; i&lt;0x200; i++)
175 00168 {
176 00169 spiTransferByte(*buffer++);
177 00170 }
178 00171 <span class="comment">// write 16-bit CRC (dummy values)</span>
179 00172 spiTransferByte(0xFF);
180 00173 spiTransferByte(0xFF);
181 00174 <span class="comment">// read data response token</span>
182 00175 r1 = spiTransferByte(0xFF);
183 00176 <span class="keywordflow">if</span>( (r1&amp;MMC_DR_MASK) != MMC_DR_ACCEPT)
184 00177 <span class="keywordflow">return</span> r1;
185 00178 <span class="preprocessor"> #ifdef MMC_DEBUG</span>
186 00179 <span class="preprocessor"></span> rprintf(<span class="stringliteral">"Data Response Token=0x%x\r\n"</span>, r1);
187 00180 <span class="preprocessor"> #endif</span>
188 00181 <span class="preprocessor"></span> <span class="comment">// wait until card not busy</span>
189 00182 <span class="keywordflow">while</span>(!spiTransferByte(0xFF));
190 00183 <span class="comment">// release chip select</span>
191 00184 sbi(MMC_CS_PORT,MMC_CS_PIN);
192 00185 <span class="comment">// return success</span>
193 00186 <span class="keywordflow">return</span> 0;
194 00187 }
195 00188
196 <a name="l00189"></a><a class="code" href="group__mmc.html#ga5">00189</a> u08 <a class="code" href="group__mmc.html#ga5">mmcCommand</a>(u08 cmd, u32 arg)
197 00190 {
198 00191 u08 r1;
199 00192 u08 retry=0;
200 00193 <span class="comment">// send command</span>
201 00194 spiTransferByte(cmd | 0x40);
202 00195 spiTransferByte(arg&gt;&gt;24);
203 00196 spiTransferByte(arg&gt;&gt;16);
204 00197 spiTransferByte(arg&gt;&gt;8);
205 00198 spiTransferByte(arg);
206 00199 spiTransferByte(0x95); <span class="comment">// crc valid only for MMC_GO_IDLE_STATE</span>
207 00200 <span class="comment">// end command</span>
208 00201 <span class="comment">// wait for response</span>
209 00202 <span class="comment">// if more than 8 retries, card has timed-out</span>
210 00203 <span class="comment">// return the received 0xFF</span>
211 00204 <span class="keywordflow">while</span>((r1 = spiTransferByte(0xFF)) == 0xFF)
212 00205 <span class="keywordflow">if</span>(retry++ &gt; 8) <span class="keywordflow">break</span>;
213 00206 <span class="comment">// return response</span>
214 00207 <span class="keywordflow">return</span> r1;
215 00208 }
216 </pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:07 2006 for Procyon AVRlib by&nbsp;
217 <a href="http://www.doxygen.org/index.html">
218 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address>
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