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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 <a 00041 { 00042 00043 spiInit(); 00044 00045 00046 00047 } 00048 <a 00050 { 00051 u08 i; 00052 u08 retry; 00053 u08 r1=0; 00054 00055 retry = 0; 00056 00057 { 00058 00059 00060 00061 00062 00063 00064 00065 00066 retry++; 00067 00068 00069 00070 00071 00072 00073 retry = 0; 00074 00075 { 00076 00077 00078 00079 00080 00081 00082 retry++; 00083 00084 00085 00086 00087 00088 00089 00090 00091 00092 00093 00094 00095 00096 00097 00098 00099 00100 } 00101 <a 00103 { 00104 u08 r1; 00105 00106 00107 00108 00109 00110 00111 00112 00113 00114 } 00115 <a 00117 { 00118 u08 r1; 00119 u16 i; 00120 00121 00122 00123 00124 00125 00126 00127 00128 00129 00130 00131 00132 00133 00134 00135 { 00136 00137 } 00138 00139 00140 00141 00142 00143 00144 00145 } 00146 <a 00148 { 00149 u08 r1; 00150 u16 i; 00151 00152 00153 00154 00155 00156 00157 00158 00159 00160 00161 00162 00163 00164 00165 00166 00167 00168 { 00169 00170 } 00171 00172 00173 00174 00175 00176 00177 00178 00179 00180 00181 00182 00183 00184 00185 00186 00187 } 00188 <a 00190 { 00191 u08 r1; 00192 u08 retry=0; 00193 00194 00195 00196 00197 00198 00199 00200 00201 00202 00203 00204 00205 00206 00207 00208 } </ <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: mmc.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>mmc.c</h1><a href="mmc_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 /*! \file mmc.c \brief MultiMedia and SD Flash Card Interface. */ //***************************************************************************** // // File Name : 'mmc.c' // Title : MultiMedia and SD Flash Card Interface // Author : Pascal Stang - Copyright (C) 2004 // Created : 2004.09.22 // Revised : 2006.06.12 // Version : 0.1 // Target MCU : Atmel AVR Series // Editor Tabs : 4 // // NOTE: This code is currently below version 1.0, and therefore is considered // to be lacking in some functionality or documentation, or may not be fully // tested. Nonetheless, you can expect most functions to work. // // This code is distributed under the GNU Public License // which can be found at http://www.gnu.org/licenses/gpl.txt // //***************************************************************************** //----- Include Files --------------------------------------------------------- #include <avr/io.h> // include I/O definitions (port names, pin names, etc) #include <avr/interrupt.h> // include interrupt support #include "<a class="code" href="global_8h.html">global.h</a>" // include our global settings #include "<a class="code" href="spi_8h.html">spi.h</a>" // include spi bus support #include "<a class="code" href="rprintf_8h.html">rprintf.h</a>" #include "<a class="code" href="mmc_8h.html">mmc.h</a>" // include project-specific hardware configuration #include "<a class="code" href="mmcconf_8h.html">mmcconf.h</a>" // Global variables // Functions name="l00040"></a><a class="code" href="group__mmc.html#ga0">00040</a> void <a class="code" href="group__mmc.html#ga0">mmcInit</a>(void) // initialize SPI interface // release chip select sbi(MMC_CS_DDR, MMC_CS_PIN); sbi(MMC_CS_PORT,MMC_CS_PIN); name="l00049"></a><a class="code" href="group__mmc.html#ga1">00049</a> u08 <a class="code" href="group__mmc.html#ga1">mmcReset</a>(void) do // send dummy bytes with CS high before accessing for(i=0;i<10;i++) spiTransferByte(0xFF); // resetting card, go to SPI mode 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); #ifdef MMC_DEBUG rprintf("MMC_GO_IDLE_STATE: R1=0x%x\r\n", r1); #endif // do retry counter if(retry>10) return -1; } while(r1 != 0x01); // TODO: check card parameters for voltage compliance // before issuing initialize command do // initializing card for operation 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); #ifdef MMC_DEBUG rprintf("MMC_SEND_OP_COND: R1=0x%x\r\n", r1); #endif // do retry counter if(retry>100) return -1; } while(r1); // turn off CRC checking to simplify communication 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); #ifdef MMC_DEBUG rprintf("MMC_CRC_ON_OFF: R1=0x%x\r\n", r1); #endif // set block length to 512 bytes r1 = <a class="code" href="group__mmc.html#ga2">mmcSendCommand</a>(<a class="code" href="group__mmc.html#ga11">MMC_SET_BLOCKLEN</a>, 512); #ifdef MMC_DEBUG rprintf("MMC_SET_BLOCKLEN: R1=0x%x\r\n", r1); #endif // return success return 0; 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) // assert chip select cbi(MMC_CS_PORT,MMC_CS_PIN); // issue the command r1 = <a class="code" href="group__mmc.html#ga5">mmcCommand</a>(cmd, arg); // release chip select sbi(MMC_CS_PORT,MMC_CS_PIN); return r1; 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) // assert chip select cbi(MMC_CS_PORT,MMC_CS_PIN); // issue command 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<<9); #ifdef MMC_DEBUG rprintf("MMC Read Block R1=0x%x\r\n", r1); #endif // check for valid response if(r1 != 0x00) return r1; // wait for block start while(spiTransferByte(0xFF) != <a class="code" href="group__mmc.html#ga34">MMC_STARTBLOCK_READ</a>); // read in data for(i=0; i<0x200; i++) *buffer++ = spiTransferByte(0xFF); // read 16-bit CRC spiTransferByte(0xFF); spiTransferByte(0xFF); // release chip select sbi(MMC_CS_PORT,MMC_CS_PIN); // return success return 0; 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) // assert chip select cbi(MMC_CS_PORT,MMC_CS_PIN); // issue command r1 = <a class="code" href="group__mmc.html#ga5">mmcCommand</a>(<a class="code" href="group__mmc.html#ga13">MMC_WRITE_BLOCK</a>, sector<<9); #ifdef MMC_DEBUG rprintf("MMC Write Block R1=0x%x\r\n", r1); #endif // check for valid response if(r1 != 0x00) return r1; // send dummy spiTransferByte(0xFF); // send data start token spiTransferByte(<a class="code" href="group__mmc.html#ga35">MMC_STARTBLOCK_WRITE</a>); // write data for(i=0; i<0x200; i++) spiTransferByte(*buffer++); // write 16-bit CRC (dummy values) spiTransferByte(0xFF); spiTransferByte(0xFF); // read data response token r1 = spiTransferByte(0xFF); if( (r1&MMC_DR_MASK) != MMC_DR_ACCEPT) return r1; #ifdef MMC_DEBUG rprintf("Data Response Token=0x%x\r\n", r1); #endif // wait until card not busy while(!spiTransferByte(0xFF)); // release chip select sbi(MMC_CS_PORT,MMC_CS_PIN); // return success return 0; 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) // send command spiTransferByte(cmd | 0x40); spiTransferByte(arg>>24); spiTransferByte(arg>>16); spiTransferByte(arg>>8); spiTransferByte(arg); spiTransferByte(0x95); // crc valid only for MMC_GO_IDLE_STATE // end command // wait for response // if more than 8 retries, card has timed-out // return the received 0xFF while((r1 = spiTransferByte(0xFF)) == 0xFF) if(retry++ > 8) break; // return response return r1; pre></div><hr size="1"><address style="align: right;">Generated on Sun Oct 29 03:41:07 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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