VLSI Solution Oy Evaluation MP3 Player Source Code Documentation

00001 00019 #include "storage.h" 00020 #include "board.h" 00021 #include "console.h" 00022 #include "mmc.h" 00023 #include "buffer.h" 00024 00025 00026 //#define MMCDEBUG 00027 00028 00034 xdata unsigned char storageFlags = 0; 00035 00036 00037 00043 Public unsigned char InitStorage(){ 00044 00045 unsigned char result; 00046 00047 ConsoleWrite ("Init: Storage v2: supports: MMC,SD,miniSD in SPI mode\r"); 00048 00049 result=InitMMC(); 00050 if (result==0x0e){ //ok, no support for seek-before-read 00051 ConsoleWrite("Storage initialized in seek-and-read mode.\r"); 00052 storageFlags = 1; 00053 return 0; 00054 } 00055 00056 if (result){ //error resulted in MMC startup 00057 ConsoleWrite("InitStorage: Can't start MMC. "); 00058 ConsolePutHex8(result); 00059 ConsolePutChar(13); 00060 storageFlags = 4; 00061 return 1; //MMC Init Error 00062 } 00063 00064 ConsoleWrite("InitStorage ok.\r"); 00065 storageFlags = 0; 00066 return 0; 00067 00068 } 00069 00070 00071 Public unsigned char PrepareToReadDiskSector(unsigned long sectorN){ 00072 00073 #ifdef MMCDEBUG 00074 ConsoleWrite("<strategy:"); 00075 ConsolePutUInt(sectorN); 00076 ConsoleWrite(" Flags:"); 00077 ConsolePutHex8(storageFlags); 00078 #endif 00079 00080 if (!storageFlags){ 00081 //Storage device supports seek-before-read 00082 if (SeekSector(sectorN)){ 00083 00084 #ifdef MMCDEBUG 00085 ConsoleWrite("Seek Error. strategy>"); 00086 #endif 00087 00088 return 0x0f; //seek error code 00089 } 00090 storageFlags |= 0x02; //flag: a sector is seeked for reading 00091 00092 #ifdef MMCDEBUG 00093 ConsoleWrite("Seeked. strategy>"); 00094 #endif 00095 00096 return 0; //ok return 00097 } 00098 00099 #ifdef MMCDEBUG 00100 ConsoleWrite("strategy>"); 00101 #endif 00102 00103 return 0; //ok return 00104 } 00105 00106 00110 Public unsigned char ReadDiskSector(unsigned long sectorN){ 00111 00112 00113 #ifdef MMCDEBUG 00114 ConsoleWrite("<read"); //Read called (strategy, not yet actual read) 00115 #endif 00116 00117 //if a sector has not already been seeked, seek now. 00118 if (!(storageFlags&0x02)){ 00119 #ifdef MMCDEBUG 00120 ConsoleWrite("F"); 00121 #endif 00122 if (SeekSector(sectorN)) return 0x0f; //seek error 00123 } 00124 00125 storageFlags &= 0xfd; //clear sector-already-seeked flag 00126 if (ReadPhysicalSector()){ 00127 ConsoleWrite("error read>"); 00128 return 0x10; //read error 00129 } 00130 00131 #ifdef MMCDEBUG 00132 ConsoleWrite("read>"); 00133 #endif 00134 00135 return 0; /* All OK return */ 00136 } 00137 00138 00139 00141 Public void DumpDiskSector(){ 00142 unsigned int ha,la; 00143 00144 ConsoleWrite("\rDiskBlock "); 00145 ConsolePutUInt(sectorAddress.l); 00146 ConsoleWrite(":\r"); 00147 for (ha=0; ha<32; ha++){ 00148 ConsolePutHex16 ((ha<<4)); 00149 ConsoleWrite(": "); 00150 for (la=0; la<16; la++){ 00151 ConsolePutHex8(diskSect.raw.buf[(ha<<4)+la]); 00152 ConsolePutChar(' '); 00153 if (la==7){ 00154 ConsolePutChar(' '); 00155 } 00156 } 00157 ConsolePutChar(' '); 00158 for (la=0; la<16; la++){ 00159 if ((diskSect.raw.buf[(ha<<4)+la]) > 30){ 00160 ConsolePutChar(diskSect.raw.buf[(ha<<4)+la]); 00161 }else{ 00162 ConsolePutChar('.'); 00163 } 00164 } 00165 ConsolePutChar('\r'); 00166 } 00167 } 00168 00169 00170 00171 00172 00173 00174 00175 00176 00183 Public void WriteDiskSector(unsigned long sectorN){ 00184 sectorAddress.l = sectorN; 00185 dataBufPtr = diskSect.raw.buf; 00186 WritePhysicalSector(); 00187 }

storage.c