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309
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1 /*-----------------------------------------------------------------------*/ |
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2 /* MMCv3/SDv1/SDv2 (in SPI mode) control module (C)ChaN, 2010 */ |
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3 /*-----------------------------------------------------------------------*/ |
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4 /* Only rcvr_spi(), xmit_spi(), disk_timerproc() and some macros */ |
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5 /* are platform dependent. */ |
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6 /*-----------------------------------------------------------------------*/ |
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7 |
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8 |
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9 #include <avr/io.h> |
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10 #include "diskio.h" |
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11 |
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12 |
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13 /*-------------------------------------------------------------------------- |
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14 |
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15 Module Private Functions |
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16 |
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17 ---------------------------------------------------------------------------*/ |
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18 |
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19 /* Port Controls (Platform dependent) */ |
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20 #define CS_LOW() PORTB &= ~1 /* MMC CS = L */ |
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21 #define CS_HIGH() PORTB |= 1 /* MMC CS = H */ |
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22 #define SOCKWP (PINB & 0x20) /* Write protected. yes:true, no:false, default:false */ |
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23 #define SOCKINS (!(PINB & 0x10)) /* Card detected. yes:true, no:false, default:true */ |
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24 |
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25 #define FCLK_SLOW() SPCR = 0x52 /* Set slow clock (100k-400k) */ |
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26 #define FCLK_FAST() SPCR = 0x50 /* Set fast clock (depends on the CSD) */ |
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27 |
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28 |
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29 /* Definitions for MMC/SDC command */ |
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30 #define CMD0 (0) /* GO_IDLE_STATE */ |
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31 #define CMD1 (1) /* SEND_OP_COND (MMC) */ |
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32 #define ACMD41 (0x80+41) /* SEND_OP_COND (SDC) */ |
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33 #define CMD8 (8) /* SEND_IF_COND */ |
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34 #define CMD9 (9) /* SEND_CSD */ |
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35 #define CMD10 (10) /* SEND_CID */ |
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36 #define CMD12 (12) /* STOP_TRANSMISSION */ |
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37 #define ACMD13 (0x80+13) /* SD_STATUS (SDC) */ |
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38 #define CMD16 (16) /* SET_BLOCKLEN */ |
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39 #define CMD17 (17) /* READ_SINGLE_BLOCK */ |
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40 #define CMD18 (18) /* READ_MULTIPLE_BLOCK */ |
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41 #define CMD23 (23) /* SET_BLOCK_COUNT (MMC) */ |
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42 #define ACMD23 (0x80+23) /* SET_WR_BLK_ERASE_COUNT (SDC) */ |
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43 #define CMD24 (24) /* WRITE_BLOCK */ |
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44 #define CMD25 (25) /* WRITE_MULTIPLE_BLOCK */ |
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45 #define CMD55 (55) /* APP_CMD */ |
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46 #define CMD58 (58) /* READ_OCR */ |
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47 |
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48 /* Card type flags (CardType) */ |
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49 #define CT_MMC 0x01 /* MMC ver 3 */ |
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50 #define CT_SD1 0x02 /* SD ver 1 */ |
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51 #define CT_SD2 0x04 /* SD ver 2 */ |
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52 #define CT_SDC (CT_SD1|CT_SD2) /* SD */ |
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53 #define CT_BLOCK 0x08 /* Block addressing */ |
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54 |
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55 |
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56 static volatile |
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57 DSTATUS Stat = STA_NOINIT; /* Disk status */ |
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58 |
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59 static volatile |
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60 BYTE Timer1, Timer2; /* 100Hz decrement timer */ |
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61 |
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62 static |
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63 BYTE CardType; /* Card type flags */ |
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64 |
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65 |
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66 /*-----------------------------------------------------------------------*/ |
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67 /* Transmit a byte to MMC via SPI (Platform dependent) */ |
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68 /*-----------------------------------------------------------------------*/ |
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69 |
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70 #define xmit_spi(dat) SPDR=(dat); loop_until_bit_is_set(SPSR,SPIF) |
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71 |
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72 |
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73 |
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74 /*-----------------------------------------------------------------------*/ |
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75 /* Receive a byte from MMC via SPI (Platform dependent) */ |
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76 /*-----------------------------------------------------------------------*/ |
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77 |
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78 static |
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79 BYTE rcvr_spi (void) |
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80 { |
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81 SPDR = 0xFF; |
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82 loop_until_bit_is_set(SPSR, SPIF); |
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83 return SPDR; |
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84 } |
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85 |
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86 /* Alternative macro to receive data fast */ |
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87 #define rcvr_spi_m(dst) SPDR=0xFF; loop_until_bit_is_set(SPSR,SPIF); *(dst)=SPDR |
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88 |
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89 |
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90 |
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91 /*-----------------------------------------------------------------------*/ |
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92 /* Wait for card ready */ |
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93 /*-----------------------------------------------------------------------*/ |
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94 |
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95 static |
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96 int wait_ready (void) /* 1:OK, 0:Timeout */ |
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97 { |
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98 BYTE d; |
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99 |
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100 |
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101 Timer2 = 50; /* Wait for ready in timeout of 500ms */ |
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102 do |
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103 d = rcvr_spi(); |
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104 while (d != 0xFF && Timer2); |
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105 |
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106 return (d == 0xFF) ? 1 : 0; |
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107 } |
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108 |
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109 |
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110 |
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111 /*-----------------------------------------------------------------------*/ |
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112 /* Deselect the card and release SPI bus */ |
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113 /*-----------------------------------------------------------------------*/ |
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114 |
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115 static |
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116 void deselect (void) |
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117 { |
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118 CS_HIGH(); |
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119 rcvr_spi(); /* Dummy clock (force DO hi-z for multiple slave SPI) */ |
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120 } |
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121 |
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122 |
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123 |
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124 /*-----------------------------------------------------------------------*/ |
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125 /* Select the card and wait for ready */ |
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126 /*-----------------------------------------------------------------------*/ |
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127 |
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128 static |
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129 int select (void) /* 1:Successful, 0:Timeout */ |
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130 { |
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131 CS_LOW(); |
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132 rcvr_spi(); /* Dummy clock (force DO enabled) */ |
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133 |
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134 if (wait_ready()) return 1; /* OK */ |
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135 deselect(); |
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136 return 0; /* Timeout */ |
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137 } |
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138 |
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139 |
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140 |
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141 /*-----------------------------------------------------------------------*/ |
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142 /* Power Control (Platform dependent) */ |
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143 /*-----------------------------------------------------------------------*/ |
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144 /* When the target system does not support socket power control, there */ |
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145 /* is nothing to do in these functions and chk_power always returns 1. */ |
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146 |
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147 static |
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148 int power_status(void) /* Socket power state: 0=off, 1=on */ |
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149 { |
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150 return 0; |
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151 // matt |
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152 //return (PORTE & 0x80) ? 0 : 1; |
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153 } |
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154 |
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155 |
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156 static |
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157 void power_on (void) |
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158 { |
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159 // matt |
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160 #if 0 |
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161 PORTE &= ~0x80; /* Socket power on */ |
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162 for (Timer1 = 2; Timer1; ); /* Wait for 20ms */ |
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163 PORTB = 0b10110101; /* Enable drivers */ |
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164 DDRB = 0b11000111; |
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165 #endif |
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166 |
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167 SPCR = 0x52; /* Enable SPI function in mode 0 */ |
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168 SPSR = 0x01; /* SPI 2x mode */ |
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169 } |
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170 |
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171 |
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172 static |
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173 void power_off (void) |
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174 { |
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175 SPCR = 0; /* Disable SPI function */ |
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176 DDRB = 0b11000000; /* Disable drivers */ |
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177 PORTB = 0b10110000; |
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178 |
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179 // matt |
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180 #if 0 |
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181 PORTE |= 0x80; /* Socket power off */ |
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182 #endif |
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183 Stat |= STA_NOINIT; |
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184 } |
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185 |
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186 |
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187 |
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188 /*-----------------------------------------------------------------------*/ |
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189 /* Receive a data packet from MMC */ |
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190 /*-----------------------------------------------------------------------*/ |
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191 |
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192 static |
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193 int rcvr_datablock ( |
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194 BYTE *buff, /* Data buffer to store received data */ |
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195 UINT btr /* Byte count (must be multiple of 4) */ |
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196 ) |
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197 { |
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198 BYTE token; |
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199 |
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200 |
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201 Timer1 = 20; |
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202 do { /* Wait for data packet in timeout of 200ms */ |
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203 token = rcvr_spi(); |
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204 } while ((token == 0xFF) && Timer1); |
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205 if(token != 0xFE) return 0; /* If not valid data token, retutn with error */ |
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206 |
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207 do { /* Receive the data block into buffer */ |
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208 rcvr_spi_m(buff++); |
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209 rcvr_spi_m(buff++); |
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210 rcvr_spi_m(buff++); |
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211 rcvr_spi_m(buff++); |
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212 } while (btr -= 4); |
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213 rcvr_spi(); /* Discard CRC */ |
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214 rcvr_spi(); |
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215 |
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216 return 1; /* Return with success */ |
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217 } |
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218 |
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219 |
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220 |
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221 /*-----------------------------------------------------------------------*/ |
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222 /* Send a data packet to MMC */ |
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223 /*-----------------------------------------------------------------------*/ |
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224 |
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225 static |
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226 int xmit_datablock ( |
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227 const BYTE *buff, /* 512 byte data block to be transmitted */ |
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228 BYTE token /* Data/Stop token */ |
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229 ) |
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230 { |
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231 BYTE resp, wc; |
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232 |
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233 |
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234 if (!wait_ready()) return 0; |
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235 |
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236 xmit_spi(token); /* Xmit data token */ |
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237 if (token != 0xFD) { /* Is data token */ |
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238 wc = 0; |
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239 do { /* Xmit the 512 byte data block to MMC */ |
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240 xmit_spi(*buff++); |
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241 xmit_spi(*buff++); |
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242 } while (--wc); |
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243 xmit_spi(0xFF); /* CRC (Dummy) */ |
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244 xmit_spi(0xFF); |
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245 resp = rcvr_spi(); /* Reveive data response */ |
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246 if ((resp & 0x1F) != 0x05) /* If not accepted, return with error */ |
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247 return 0; |
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248 } |
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249 |
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250 return 1; |
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251 } |
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252 |
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253 |
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254 |
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255 /*-----------------------------------------------------------------------*/ |
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256 /* Send a command packet to MMC */ |
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257 /*-----------------------------------------------------------------------*/ |
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258 |
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259 static |
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260 BYTE send_cmd ( /* Returns R1 resp (bit7==1:Send failed) */ |
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261 BYTE cmd, /* Command index */ |
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262 DWORD arg /* Argument */ |
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263 ) |
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264 { |
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265 BYTE n, res; |
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266 |
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267 |
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268 if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */ |
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269 cmd &= 0x7F; |
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270 res = send_cmd(CMD55, 0); |
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271 if (res > 1) return res; |
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272 } |
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273 |
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274 /* Select the card and wait for ready */ |
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275 deselect(); |
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276 if (!select()) return 0xFF; |
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277 |
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278 /* Send command packet */ |
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279 xmit_spi(0x40 | cmd); /* Start + Command index */ |
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280 xmit_spi((BYTE)(arg >> 24)); /* Argument[31..24] */ |
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281 xmit_spi((BYTE)(arg >> 16)); /* Argument[23..16] */ |
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282 xmit_spi((BYTE)(arg >> 8)); /* Argument[15..8] */ |
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283 xmit_spi((BYTE)arg); /* Argument[7..0] */ |
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284 n = 0x01; /* Dummy CRC + Stop */ |
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285 if (cmd == CMD0) n = 0x95; /* Valid CRC for CMD0(0) */ |
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286 if (cmd == CMD8) n = 0x87; /* Valid CRC for CMD8(0x1AA) */ |
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287 xmit_spi(n); |
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288 |
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289 /* Receive command response */ |
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290 if (cmd == CMD12) rcvr_spi(); /* Skip a stuff byte when stop reading */ |
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291 n = 10; /* Wait for a valid response in timeout of 10 attempts */ |
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292 do |
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293 res = rcvr_spi(); |
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294 while ((res & 0x80) && --n); |
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295 |
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296 return res; /* Return with the response value */ |
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297 } |
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298 |
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299 |
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300 |
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301 /*-------------------------------------------------------------------------- |
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302 |
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303 Public Functions |
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304 |
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305 ---------------------------------------------------------------------------*/ |
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306 |
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307 |
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308 /*-----------------------------------------------------------------------*/ |
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309 /* Initialize Disk Drive */ |
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310 /*-----------------------------------------------------------------------*/ |
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311 |
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312 DSTATUS disk_initialize ( |
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313 BYTE drv /* Physical drive nmuber (0) */ |
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314 ) |
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315 { |
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316 BYTE n, cmd, ty, ocr[4]; |
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317 |
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318 |
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319 if (drv) return STA_NOINIT; /* Supports only single drive */ |
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320 if (Stat & STA_NODISK) return Stat; /* No card in the socket */ |
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321 |
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322 power_on(); /* Force socket power on */ |
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323 FCLK_SLOW(); |
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324 for (n = 10; n; n--) rcvr_spi(); /* 80 dummy clocks */ |
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325 |
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326 ty = 0; |
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327 if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */ |
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328 Timer1 = 100; /* Initialization timeout of 1000 msec */ |
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329 if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2? */ |
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330 for (n = 0; n < 4; n++) ocr[n] = rcvr_spi(); /* Get trailing return value of R7 resp */ |
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331 if (ocr[2] == 0x01 && ocr[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */ |
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332 while (Timer1 && send_cmd(ACMD41, 1UL << 30)); /* Wait for leaving idle state (ACMD41 with HCS bit) */ |
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333 if (Timer1 && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */ |
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334 for (n = 0; n < 4; n++) ocr[n] = rcvr_spi(); |
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335 ty = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2; /* SDv2 */ |
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336 } |
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337 } |
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338 } else { /* SDv1 or MMCv3 */ |
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339 if (send_cmd(ACMD41, 0) <= 1) { |
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340 ty = CT_SD1; cmd = ACMD41; /* SDv1 */ |
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341 } else { |
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342 ty = CT_MMC; cmd = CMD1; /* MMCv3 */ |
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343 } |
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344 while (Timer1 && send_cmd(cmd, 0)); /* Wait for leaving idle state */ |
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345 if (!Timer1 || send_cmd(CMD16, 512) != 0) /* Set R/W block length to 512 */ |
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346 ty = 0; |
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347 } |
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348 } |
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349 CardType = ty; |
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350 deselect(); |
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351 |
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352 if (ty) { /* Initialization succeded */ |
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353 Stat &= ~STA_NOINIT; /* Clear STA_NOINIT */ |
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354 FCLK_FAST(); |
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355 } else { /* Initialization failed */ |
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356 power_off(); |
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357 } |
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358 |
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359 return Stat; |
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360 } |
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361 |
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362 |
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363 |
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364 /*-----------------------------------------------------------------------*/ |
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365 /* Get Disk Status */ |
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366 /*-----------------------------------------------------------------------*/ |
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367 |
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368 DSTATUS disk_status ( |
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369 BYTE drv /* Physical drive nmuber (0) */ |
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370 ) |
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371 { |
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372 if (drv) return STA_NOINIT; /* Supports only single drive */ |
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373 return Stat; |
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374 } |
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375 |
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376 |
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377 |
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378 /*-----------------------------------------------------------------------*/ |
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379 /* Read Sector(s) */ |
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380 /*-----------------------------------------------------------------------*/ |
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381 |
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382 DRESULT disk_read ( |
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383 BYTE drv, /* Physical drive nmuber (0) */ |
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384 BYTE *buff, /* Pointer to the data buffer to store read data */ |
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385 DWORD sector, /* Start sector number (LBA) */ |
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386 BYTE count /* Sector count (1..255) */ |
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387 ) |
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388 { |
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389 if (drv || !count) return RES_PARERR; |
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390 if (Stat & STA_NOINIT) return RES_NOTRDY; |
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391 |
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392 if (!(CardType & CT_BLOCK)) sector *= 512; /* Convert to byte address if needed */ |
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393 |
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394 if (count == 1) { /* Single block read */ |
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395 if ((send_cmd(CMD17, sector) == 0) /* READ_SINGLE_BLOCK */ |
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396 && rcvr_datablock(buff, 512)) |
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397 count = 0; |
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398 } |
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399 else { /* Multiple block read */ |
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400 if (send_cmd(CMD18, sector) == 0) { /* READ_MULTIPLE_BLOCK */ |
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401 do { |
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402 if (!rcvr_datablock(buff, 512)) break; |
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403 buff += 512; |
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404 } while (--count); |
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405 send_cmd(CMD12, 0); /* STOP_TRANSMISSION */ |
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406 } |
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407 } |
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408 deselect(); |
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409 |
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410 return count ? RES_ERROR : RES_OK; |
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411 } |
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412 |
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413 |
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414 |
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415 /*-----------------------------------------------------------------------*/ |
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416 /* Write Sector(s) */ |
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417 /*-----------------------------------------------------------------------*/ |
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418 |
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419 DRESULT disk_write ( |
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420 BYTE drv, /* Physical drive nmuber (0) */ |
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421 const BYTE *buff, /* Pointer to the data to be written */ |
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422 DWORD sector, /* Start sector number (LBA) */ |
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423 BYTE count /* Sector count (1..255) */ |
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424 ) |
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425 { |
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426 if (drv || !count) return RES_PARERR; |
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427 if (Stat & STA_NOINIT) return RES_NOTRDY; |
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428 if (Stat & STA_PROTECT) return RES_WRPRT; |
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429 |
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430 if (!(CardType & CT_BLOCK)) sector *= 512; /* Convert to byte address if needed */ |
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431 |
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432 if (count == 1) { /* Single block write */ |
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433 if ((send_cmd(CMD24, sector) == 0) /* WRITE_BLOCK */ |
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434 && xmit_datablock(buff, 0xFE)) |
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435 count = 0; |
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436 } |
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437 else { /* Multiple block write */ |
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438 if (CardType & CT_SDC) send_cmd(ACMD23, count); |
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439 if (send_cmd(CMD25, sector) == 0) { /* WRITE_MULTIPLE_BLOCK */ |
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440 do { |
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441 if (!xmit_datablock(buff, 0xFC)) break; |
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442 buff += 512; |
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443 } while (--count); |
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444 if (!xmit_datablock(0, 0xFD)) /* STOP_TRAN token */ |
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445 count = 1; |
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446 } |
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447 } |
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448 deselect(); |
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449 |
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450 return count ? RES_ERROR : RES_OK; |
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451 } |
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452 |
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453 |
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454 |
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455 /*-----------------------------------------------------------------------*/ |
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456 /* Miscellaneous Functions */ |
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457 /*-----------------------------------------------------------------------*/ |
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458 |
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459 DRESULT disk_ioctl ( |
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460 BYTE drv, /* Physical drive nmuber (0) */ |
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461 BYTE ctrl, /* Control code */ |
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462 void *buff /* Buffer to send/receive control data */ |
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463 ) |
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464 { |
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465 DRESULT res; |
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466 BYTE n, csd[16], *ptr = buff; |
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467 WORD csize; |
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468 |
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469 |
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470 if (drv) return RES_PARERR; |
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471 |
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472 res = RES_ERROR; |
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473 |
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474 if (ctrl == CTRL_POWER) { |
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475 switch (ptr[0]) { |
|
|
476 case 0: /* Sub control code (POWER_OFF) */ |
|
|
477 power_off(); /* Power off */ |
|
|
478 res = RES_OK; |
|
|
479 break; |
|
|
480 case 1: /* Sub control code (POWER_GET) */ |
|
|
481 ptr[1] = (BYTE)power_status(); |
|
|
482 res = RES_OK; |
|
|
483 break; |
|
|
484 default : |
|
|
485 res = RES_PARERR; |
|
|
486 } |
|
|
487 } |
|
|
488 else { |
|
|
489 if (Stat & STA_NOINIT) return RES_NOTRDY; |
|
|
490 |
|
|
491 switch (ctrl) { |
|
|
492 case CTRL_SYNC : /* Make sure that no pending write process. Do not remove this or written sector might not left updated. */ |
|
|
493 if (select()) { |
|
|
494 deselect(); |
|
|
495 res = RES_OK; |
|
|
496 } |
|
|
497 break; |
|
|
498 |
|
|
499 case GET_SECTOR_COUNT : /* Get number of sectors on the disk (DWORD) */ |
|
|
500 if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) { |
|
|
501 if ((csd[0] >> 6) == 1) { /* SDC ver 2.00 */ |
|
|
502 csize = csd[9] + ((WORD)csd[8] << 8) + 1; |
|
|
503 *(DWORD*)buff = (DWORD)csize << 10; |
|
|
504 } else { /* SDC ver 1.XX or MMC*/ |
|
|
505 n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2; |
|
|
506 csize = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1; |
|
|
507 *(DWORD*)buff = (DWORD)csize << (n - 9); |
|
|
508 } |
|
|
509 res = RES_OK; |
|
|
510 } |
|
|
511 break; |
|
|
512 |
|
|
513 case GET_SECTOR_SIZE : /* Get R/W sector size (WORD) */ |
|
|
514 *(WORD*)buff = 512; |
|
|
515 res = RES_OK; |
|
|
516 break; |
|
|
517 |
|
|
518 case GET_BLOCK_SIZE : /* Get erase block size in unit of sector (DWORD) */ |
|
|
519 if (CardType & CT_SD2) { /* SDv2? */ |
|
|
520 if (send_cmd(ACMD13, 0) == 0) { /* Read SD status */ |
|
|
521 rcvr_spi(); |
|
|
522 if (rcvr_datablock(csd, 16)) { /* Read partial block */ |
|
|
523 for (n = 64 - 16; n; n--) rcvr_spi(); /* Purge trailing data */ |
|
|
524 *(DWORD*)buff = 16UL << (csd[10] >> 4); |
|
|
525 res = RES_OK; |
|
|
526 } |
|
|
527 } |
|
|
528 } else { /* SDv1 or MMCv3 */ |
|
|
529 if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) { /* Read CSD */ |
|
|
530 if (CardType & CT_SD1) { /* SDv1 */ |
|
|
531 *(DWORD*)buff = (((csd[10] & 63) << 1) + ((WORD)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1); |
|
|
532 } else { /* MMCv3 */ |
|
|
533 *(DWORD*)buff = ((WORD)((csd[10] & 124) >> 2) + 1) * (((csd[11] & 3) << 3) + ((csd[11] & 224) >> 5) + 1); |
|
|
534 } |
|
|
535 res = RES_OK; |
|
|
536 } |
|
|
537 } |
|
|
538 break; |
|
|
539 |
|
|
540 case MMC_GET_TYPE : /* Get card type flags (1 byte) */ |
|
|
541 *ptr = CardType; |
|
|
542 res = RES_OK; |
|
|
543 break; |
|
|
544 |
|
|
545 case MMC_GET_CSD : /* Receive CSD as a data block (16 bytes) */ |
|
|
546 if (send_cmd(CMD9, 0) == 0 /* READ_CSD */ |
|
|
547 && rcvr_datablock(ptr, 16)) |
|
|
548 res = RES_OK; |
|
|
549 break; |
|
|
550 |
|
|
551 case MMC_GET_CID : /* Receive CID as a data block (16 bytes) */ |
|
|
552 if (send_cmd(CMD10, 0) == 0 /* READ_CID */ |
|
|
553 && rcvr_datablock(ptr, 16)) |
|
|
554 res = RES_OK; |
|
|
555 break; |
|
|
556 |
|
|
557 case MMC_GET_OCR : /* Receive OCR as an R3 resp (4 bytes) */ |
|
|
558 if (send_cmd(CMD58, 0) == 0) { /* READ_OCR */ |
|
|
559 for (n = 4; n; n--) *ptr++ = rcvr_spi(); |
|
|
560 res = RES_OK; |
|
|
561 } |
|
|
562 break; |
|
|
563 |
|
|
564 case MMC_GET_SDSTAT : /* Receive SD statsu as a data block (64 bytes) */ |
|
|
565 if (send_cmd(ACMD13, 0) == 0) { /* SD_STATUS */ |
|
|
566 rcvr_spi(); |
|
|
567 if (rcvr_datablock(ptr, 64)) |
|
|
568 res = RES_OK; |
|
|
569 } |
|
|
570 break; |
|
|
571 |
|
|
572 default: |
|
|
573 res = RES_PARERR; |
|
|
574 } |
|
|
575 |
|
|
576 deselect(); |
|
|
577 } |
|
|
578 |
|
|
579 return res; |
|
|
580 } |
|
|
581 |
|
|
582 |
|
|
583 |
|
|
584 /*-----------------------------------------------------------------------*/ |
|
|
585 /* Device Timer Interrupt Procedure */ |
|
|
586 /*-----------------------------------------------------------------------*/ |
|
|
587 /* This function must be called in period of 10ms */ |
|
|
588 |
|
|
589 void disk_timerproc (void) |
|
|
590 { |
|
|
591 BYTE n, s; |
|
|
592 |
|
|
593 |
|
|
594 n = Timer1; /* 100Hz decrement timer */ |
|
|
595 if (n) Timer1 = --n; |
|
|
596 n = Timer2; |
|
|
597 if (n) Timer2 = --n; |
|
|
598 |
|
|
599 s = Stat; |
|
|
600 |
|
|
601 if (SOCKWP) /* Write protected */ |
|
|
602 s |= STA_PROTECT; |
|
|
603 else /* Write enabled */ |
|
|
604 s &= ~STA_PROTECT; |
|
|
605 |
|
|
606 if (SOCKINS) /* Card inserted */ |
|
|
607 s &= ~STA_NODISK; |
|
|
608 else /* Socket empty */ |
|
|
609 s |= (STA_NODISK | STA_NOINIT); |
|
|
610 |
|
|
611 Stat = s; /* Update MMC status */ |
|
|
612 } |
