1 | /*
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2 | * low_level_functions.c
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3 | *
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4 | * Created on: Jul 12, 2013
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5 | * Author: franz
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6 | */
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7 |
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8 | #include <stm32f4xx.h>
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9 | #include <stm32_configuration.h>
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10 | #include <diskio.h>
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11 | #include <helperFunctions.h>
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12 |
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13 | /*-----------------------------------------------------------------------*/
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14 | /* MMCv3/SDv1/SDv2 (in SPI mode) control module (C)ChaN, 2010 */
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15 | /*-----------------------------------------------------------------------*/
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16 |
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17 |
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18 | #define CS_HIGH() {GPIO_SetBits(GPIOB, GPIO_Pin_12); Delay(10);}
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19 | #define CS_LOW() {GPIO_ResetBits(GPIOB, GPIO_Pin_12);Delay(10);}
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20 |
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21 | #define FCLK_SLOW() ;
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22 | #define FCLK_FAST() ;
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23 |
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24 |
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25 | /**
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26 | * @brief Detect if SD card is correctly plugged in the memory slot.
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27 | * @param None
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28 | * @retval Return if SD is detected or not
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29 | */
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30 | uint8_t SD_Detect(void)
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31 | {
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32 | __IO uint8_t status = SD_PRESENT;
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33 |
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34 | /*!< Check GPIO to detect SD */
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35 | if (GPIO_ReadInputDataBit(SD_DETECT_GPIO_PORT, SD_DETECT_PIN) != Bit_RESET)
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36 | {
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37 | status = SD_NOT_PRESENT;
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38 | }
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39 | return status;
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40 | }
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41 |
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42 |
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43 | /*--------------------------------------------------------------------------
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44 |
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45 | Module Private Functions
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46 |
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47 | ---------------------------------------------------------------------------*/
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48 |
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49 | /* Definitions for MMC/SDC command */
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50 | #define CMD0 (0) /* GO_IDLE_STATE */
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51 | #define CMD1 (1) /* SEND_OP_COND (MMC) */
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52 | #define ACMD41 (0x80+41) /* SEND_OP_COND (SDC) */
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53 | #define CMD8 (8) /* SEND_IF_COND */
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54 | #define CMD9 (9) /* SEND_CSD */
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55 | #define CMD10 (10) /* SEND_CID */
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56 | #define CMD12 (12) /* STOP_TRANSMISSION */
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57 | #define ACMD13 (0x80+13) /* SD_STATUS (SDC) */
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58 | #define CMD16 (16) /* SET_BLOCKLEN */
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59 | #define CMD17 (17) /* READ_SINGLE_BLOCK */
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60 | #define CMD18 (18) /* READ_MULTIPLE_BLOCK */
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61 | #define CMD23 (23) /* SET_BLOCK_COUNT (MMC) */
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62 | #define ACMD23 (0x80+23) /* SET_WR_BLK_ERASE_COUNT (SDC) */
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63 | #define CMD24 (24) /* WRITE_BLOCK */
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64 | #define CMD25 (25) /* WRITE_MULTIPLE_BLOCK */
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65 | #define CMD32 (32) /* ERASE_ER_BLK_START */
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66 | #define CMD33 (33) /* ERASE_ER_BLK_END */
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67 | #define CMD38 (38) /* ERASE */
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68 | #define CMD55 (55) /* APP_CMD */
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69 | #define CMD58 (58) /* READ_OCR */
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70 |
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71 |
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72 | static volatile
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73 | DSTATUS Stat = STA_NOINIT; /* Disk status */
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74 |
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75 | static volatile
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76 | BYTE Timer1, Timer2; /* 100Hz decrement timer */
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77 |
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78 | static
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79 | BYTE CardType; /* Card type flags */
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80 |
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81 |
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82 | /*-----------------------------------------------------------------------*/
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83 | /* Power Control (Platform dependent) */
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84 | /*-----------------------------------------------------------------------*/
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85 | /* When the target system does not support socket power control, there */
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86 | /* is nothing to do in these functions and chk_power always returns 1. */
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87 |
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88 | static
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89 | int power_status (void) /* Socket power state: 0=off, 1=on */
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90 | {
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91 | return 1;
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92 | }
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93 |
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94 | static
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95 | void power_on (void)
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96 | {
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97 | /*Nothing to do here, hardware initialization is already done*/
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98 | return;
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99 | }
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100 |
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101 | static
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102 | void power_off (void)
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103 | {
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104 | /* We do not turn power off*/
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105 | return;
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106 | }
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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 | /* Transmit/Receive data from/to MMC via SPI (Platform dependent) */
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112 | /*-----------------------------------------------------------------------*/
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113 |
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114 | /* Exchange a byte */
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115 | static
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116 | BYTE xchg_spi ( /* Returns received data */
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117 | BYTE dat /* Data to be sent */
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118 | )
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119 | {
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120 | /* Loop while DR register in not empty */
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121 | while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET)
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122 | {
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123 | }
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124 |
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125 | /* Send a Byte through the SPI peripheral */
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126 | SPI_I2S_SendData(SPI2, dat);
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127 |
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128 | /* Wait to receive a Byte */
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129 | while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET)
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130 | {
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131 | }
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132 |
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133 | /* Return the Byte read from the SPI bus */
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134 | return (uint8_t)SPI_I2S_ReceiveData(SPI2);
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135 | }
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136 |
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137 |
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138 | /*-----------------------------------------------------------------------*/
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139 | /* Wait for card ready */
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140 | /*-----------------------------------------------------------------------*/
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141 |
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142 | static
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143 | int wait_ready ( /* 1:Ready, 0:Timeout */
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144 | UINT wt /* Timeout [ms] */
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145 | )
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146 | {
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147 | BYTE d;
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148 |
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149 |
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150 | Timer2 = wt / 10;
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151 | do
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152 | d = xchg_spi(0xFF);
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153 | while (d != 0xFF && Timer2);
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154 |
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155 | return (d == 0xFF) ? 1 : 0;
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156 | }
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157 |
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158 |
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159 |
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160 | /*-----------------------------------------------------------------------*/
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161 | /* Deselect the card and release SPI bus */
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162 | /*-----------------------------------------------------------------------*/
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163 |
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164 | static
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165 | void deselect (void)
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166 | {
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167 | CS_HIGH();
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168 | xchg_spi(0xFF); /* Dummy clock (force DO hi-z for multiple slave SPI) */
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169 | }
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170 |
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171 |
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172 |
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173 | /*-----------------------------------------------------------------------*/
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174 | /* Select the card and wait for ready */
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175 | /*-----------------------------------------------------------------------*/
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176 |
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177 | static
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178 | int select (void) /* 1:Successful, 0:Timeout */
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179 | {
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180 | CS_LOW();
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181 | xchg_spi(0xFF); /* Dummy clock (force DO enabled) */
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182 |
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183 | if (wait_ready(500)) return 1; /* OK */
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184 | deselect();
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185 | return 0; /* Timeout */
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186 | }
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187 |
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188 |
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189 |
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190 | /*-----------------------------------------------------------------------*/
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191 | /* Receive a data packet from MMC */
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192 | /*-----------------------------------------------------------------------*/
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193 |
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194 | static
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195 | int rcvr_datablock (
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196 | BYTE *buff, /* Data buffer to store received data */
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197 | UINT btr /* Byte count (must be multiple of 4) */
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198 | )
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199 | {
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200 | BYTE token;
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201 |
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202 |
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203 | Timer1 = 20;
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204 | do { /* Wait for data packet in timeout of 200ms */
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205 | token = xchg_spi(0xFF);
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206 | } while ((token == 0xFF) && Timer1);
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207 | if (token != 0xFE) return 0; /* If not valid data token, retutn with error */
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208 |
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209 | do
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210 | {
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211 | *buff++ =xchg_spi(0xFF);
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212 | *buff++ =xchg_spi(0xFF);
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213 | }while(btr -= 2);
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214 | xchg_spi(0xFF); /* Discard CRC */
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215 | xchg_spi(0xFF);
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216 |
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217 | return 1; /* Return with success */
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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 | /*-----------------------------------------------------------------------*/
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223 | /* Send a data packet to MMC */
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224 | /*-----------------------------------------------------------------------*/
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225 |
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226 | #if _USE_WRITE
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227 | static
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228 | int xmit_datablock (
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229 | const BYTE *buff, /* 512 byte data block to be transmitted */
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230 | BYTE token /* Data/Stop token */
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231 | )
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232 | {
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233 | BYTE resp;
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234 | uint16_t wc;
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235 |
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236 | if (!wait_ready(500)) return 0;
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237 |
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238 | xchg_spi(token); /* Xmit data token */
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239 | if (token != 0xFD) { /* Is data token */
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240 | wc = 512;
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241 | do { /* transmit the 512 byte data block to MMC */
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242 | xchg_spi(*buff++);
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243 | xchg_spi(*buff++);
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244 | } while (wc-=2);
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245 | xchg_spi(0xFF); /* CRC (Dummy) */
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246 | xchg_spi(0xFF);
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247 | resp = xchg_spi(0xFF); /* Reveive data response */
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248 | //debug(USART2, "xchg_spi: %d", resp);
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249 | if ((resp & 0x1F) != 0x05) /* If not accepted, return with error */
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250 | return 0;
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251 | }
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252 |
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253 | return 1;
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254 | }
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255 | #endif
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256 |
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257 |
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258 |
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259 | /*-----------------------------------------------------------------------*/
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260 | /* Send a command packet to MMC */
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261 | /*-----------------------------------------------------------------------*/
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262 |
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263 | static
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264 | BYTE send_cmd ( /* Returns R1 resp (bit7==1:Send failed) */
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265 | BYTE cmd, /* Command index */
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266 | DWORD arg /* Argument */
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267 | )
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268 | {
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269 | BYTE n, res;
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270 |
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271 |
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272 | if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */
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273 | cmd &= 0x7F;
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274 | res = send_cmd(CMD55, 0);
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275 | if (res > 1) return res;
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276 | }
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277 |
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278 | /* Select the card and wait for ready */
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279 | deselect();
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280 | if (!select()) return 0xFF;
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281 |
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282 | /* Send command packet */
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283 | xchg_spi(0x40 | cmd); /* Start + Command index */
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284 | xchg_spi((BYTE)(arg >> 24)); /* Argument[31..24] */
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285 | xchg_spi((BYTE)(arg >> 16)); /* Argument[23..16] */
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286 | xchg_spi((BYTE)(arg >> 8)); /* Argument[15..8] */
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287 | xchg_spi((BYTE)arg); /* Argument[7..0] */
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288 | n = 0x01; /* Dummy CRC + Stop */
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289 | if (cmd == CMD0) n = 0x95; /* Valid CRC for CMD0(0) + Stop */
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290 | if (cmd == CMD8) n = 0x87; /* Valid CRC for CMD8(0x1AA) Stop */
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291 | xchg_spi(n);
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292 |
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293 | /* Receive command response */
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294 | if (cmd == CMD12) xchg_spi(0xFF); /* Skip a stuff byte when stop reading */
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295 | n = 10; /* Wait for a valid response in timeout of 10 attempts */
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296 | do
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297 | res = xchg_spi(0xFF);
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298 | while ((res & 0x80) && --n);
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299 |
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300 | return res; /* Return with the response value */
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301 | }
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302 |
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303 |
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304 |
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305 | /*--------------------------------------------------------------------------
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306 |
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307 | Public Functions
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308 |
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309 | ---------------------------------------------------------------------------*/
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310 |
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311 |
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312 | /*-----------------------------------------------------------------------*/
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313 | /* Initialize Disk Drive */
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314 | /*-----------------------------------------------------------------------*/
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315 |
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316 | DSTATUS disk_initialize (
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317 | BYTE pdrv /* Physical drive nmuber (0) */
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318 | )
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319 | {
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320 | BYTE n, cmd, ty, ocr[4];
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321 |
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322 |
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323 | if (pdrv) return STA_NOINIT; /* Supports only single drive */
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324 | power_off(); /* Turn off the socket power to reset the card */
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325 | if (Stat & STA_NODISK) return Stat; /* No card in the socket */
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326 | power_on(); /* Turn on the socket power */
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327 | FCLK_SLOW();
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328 | for (n = 10; n; n--) xchg_spi(0xFF); /* 80 dummy clocks */
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329 |
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330 | ty = 0;
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331 | if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */
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332 | Timer1 = 100; /* Initialization timeout of 1000 msec */
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333 | if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2? */
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334 | debug(USART2, "SDv2\n\r");
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335 | for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF); /* Get trailing return value of R7 resp */
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336 | if (ocr[2] == 0x01 && ocr[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
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337 | while (Timer1 && send_cmd(ACMD41, 1UL << 30)); /* Wait for leaving idle state (ACMD41 with HCS bit) */
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338 | if (Timer1 && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */
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339 | for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF);
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340 | ty = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2; /* SDv2 */
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341 | }
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342 | }
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343 | } else { /* SDv1 or MMCv3 */
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344 | if (send_cmd(ACMD41, 0) <= 1) {
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345 | debug(USART2, "SDv1\n\r");
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346 | ty = CT_SD1; cmd = ACMD41; /* SDv1 */
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347 | } else {
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348 | debug(USART2, "MMCv3\n\r");
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349 | ty = CT_MMC; cmd = CMD1; /* MMCv3 */
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350 | }
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351 | while (Timer1 && send_cmd(cmd, 0)); /* Wait for leaving idle state */
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352 | if (!Timer1 || send_cmd(CMD16, 512) != 0) /* Set R/W block length to 512 */
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353 | ty = 0;
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354 | }
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355 | }
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356 | CardType = ty;
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357 | deselect();
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358 |
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359 | if (ty) { /* Initialization succeded */
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360 | Stat &= ~STA_NOINIT; /* Clear STA_NOINIT */
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361 | FCLK_FAST();
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362 | } else { /* Initialization failed */
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363 | power_off();
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364 | }
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365 |
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366 | return Stat;
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367 | }
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368 |
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369 |
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370 |
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371 | /*-----------------------------------------------------------------------*/
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372 | /* Get Disk Status */
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373 | /*-----------------------------------------------------------------------*/
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374 |
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375 | DSTATUS disk_status (
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376 | BYTE pdrv /* Physical drive nmuber (0) */
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377 | )
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378 | {
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379 | if (pdrv) return STA_NOINIT; /* Supports only single drive */
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380 | return Stat;
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381 | }
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382 |
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383 |
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384 |
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385 | /*-----------------------------------------------------------------------*/
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386 | /* Read Sector(s) */
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387 | /*-----------------------------------------------------------------------*/
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388 |
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389 | DRESULT disk_read (
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390 | BYTE pdrv, /* Physical drive nmuber (0) */
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391 | BYTE *buff, /* Pointer to the data buffer to store read data */
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392 | DWORD sector, /* Start sector number (LBA) */
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393 | BYTE count /* Sector count (1..255) */
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394 | )
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395 | {
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396 | if (pdrv || !count) return RES_PARERR;
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397 | if (Stat & STA_NOINIT) return RES_NOTRDY;
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398 |
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399 | if (!(CardType & CT_BLOCK)) sector *= 512; /* Convert to byte address if needed */
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400 |
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401 | if (count == 1) { /* Single block read */
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402 | if ((send_cmd(CMD17, sector) == 0) /* READ_SINGLE_BLOCK */
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403 | && rcvr_datablock(buff, 512))
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404 | count = 0;
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405 | }
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406 | else { /* Multiple block read */
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407 | if (send_cmd(CMD18, sector) == 0) { /* READ_MULTIPLE_BLOCK */
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408 | do {
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409 | if (!rcvr_datablock(buff, 512)) break;
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410 | buff += 512;
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411 | } while (--count);
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412 | send_cmd(CMD12, 0); /* STOP_TRANSMISSION */
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413 | }
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414 | }
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415 | deselect();
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416 |
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417 | return count ? RES_ERROR : RES_OK;
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418 | }
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419 |
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420 |
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421 |
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422 | /*-----------------------------------------------------------------------*/
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423 | /* Write Sector(s) */
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424 | /*-----------------------------------------------------------------------*/
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425 |
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426 | #if _USE_WRITE
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427 | DRESULT disk_write (
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428 | BYTE pdrv, /* Physical drive nmuber (0) */
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429 | const BYTE *buff, /* Pointer to the data to be written */
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430 | DWORD sector, /* Start sector number (LBA) */
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431 | BYTE count /* Sector count (1..255) */
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432 | )
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433 | {
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434 | if (pdrv || !count) return RES_PARERR;
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435 | if (Stat & STA_NOINIT) return RES_NOTRDY;
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436 | if (Stat & STA_PROTECT) return RES_WRPRT;
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437 |
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438 | if (!(CardType & CT_BLOCK)) sector *= 512; /* Convert to byte address if needed */
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439 |
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440 | if (count == 1) { /* Single block write */
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441 | if ((send_cmd(CMD24, sector) == 0) /* WRITE_BLOCK */
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442 | && xmit_datablock(buff, 0xFE))
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443 | count = 0;
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444 | }
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445 | else { /* Multiple block write */
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446 | if (CardType & CT_SDC) send_cmd(ACMD23, count);
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447 | if (send_cmd(CMD25, sector) == 0) { /* WRITE_MULTIPLE_BLOCK */
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448 | do {
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449 | if (!xmit_datablock(buff, 0xFC)) break;
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450 | buff += 512;
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451 | } while (--count);
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452 | if (!xmit_datablock(0, 0xFD)) /* STOP_TRAN token */
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453 | count = 1;
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454 | }
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455 | }
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456 | deselect();
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457 |
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458 | return count ? RES_ERROR : RES_OK;
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459 | }
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460 | #endif
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461 |
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462 |
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463 | /*-----------------------------------------------------------------------*/
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464 | /* Miscellaneous Functions */
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465 | /*-----------------------------------------------------------------------*/
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466 |
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467 | #if _USE_IOCTL
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468 | DRESULT disk_ioctl (
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469 | BYTE pdrv, /* Physical drive nmuber (0) */
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470 | BYTE cmd, /* Control code */
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471 | void *buff /* Buffer to send/receive control data */
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472 | )
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473 | {
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474 | DRESULT res;
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475 | BYTE n, csd[16], *ptr = buff;
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476 | DWORD *dp, st, ed, csize;
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477 |
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478 |
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479 | if (pdrv) return RES_PARERR;
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480 |
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481 | res = RES_ERROR;
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482 |
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483 | if (cmd == CTRL_POWER) {
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484 | switch (ptr[0]) {
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485 | case 0: /* Sub control code (POWER_OFF) */
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486 | power_off(); /* Power off */
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487 | res = RES_OK;
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488 | break;
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489 | case 1: /* Sub control code (POWER_GET) */
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490 | ptr[1] = (BYTE)power_status();
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491 | res = RES_OK;
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492 | break;
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493 | default :
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494 | res = RES_PARERR;
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495 | }
|
496 | }
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497 | else {
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498 | if (Stat & STA_NOINIT) return RES_NOTRDY;
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499 |
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500 | switch (cmd) {
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501 | case CTRL_SYNC : /* Make sure that no pending write process. Do not remove this or written sector might not left updated. */
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502 | if (select()) res = RES_OK;
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503 | break;
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504 |
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505 | case GET_SECTOR_COUNT : /* Get number of sectors on the disk (DWORD) */
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506 | if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {
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507 | if ((csd[0] >> 6) == 1) { /* SDC ver 2.00 */
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508 | csize = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
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509 | *(DWORD*)buff = csize << 10;
|
510 | } else { /* SDC ver 1.XX or MMC*/
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511 | n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
|
512 | csize = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
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513 | *(DWORD*)buff = csize << (n - 9);
|
514 | }
|
515 | res = RES_OK;
|
516 | }
|
517 | break;
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518 |
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519 | case GET_BLOCK_SIZE : /* Get erase block size in unit of sector (DWORD) */
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520 | if (CardType & CT_SD2) { /* SDv2? */
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521 | if (send_cmd(ACMD13, 0) == 0) { /* Read SD status */
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522 | xchg_spi(0xFF);
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523 | if (rcvr_datablock(csd, 16)) { /* Read partial block */
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524 | for (n = 64 - 16; n; n--) xchg_spi(0xFF); /* Purge trailing data */
|
525 | *(DWORD*)buff = 16UL << (csd[10] >> 4);
|
526 | res = RES_OK;
|
527 | }
|
528 | }
|
529 | } else { /* SDv1 or MMCv3 */
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530 | if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) { /* Read CSD */
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531 | if (CardType & CT_SD1) { /* SDv1 */
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532 | *(DWORD*)buff = (((csd[10] & 63) << 1) + ((WORD)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1);
|
533 | } else { /* MMCv3 */
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534 | *(DWORD*)buff = ((WORD)((csd[10] & 124) >> 2) + 1) * (((csd[11] & 3) << 3) + ((csd[11] & 224) >> 5) + 1);
|
535 | }
|
536 | res = RES_OK;
|
537 | }
|
538 | }
|
539 | break;
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540 |
|
541 | /* Following commands are never used by FatFs module */
|
542 |
|
543 | case MMC_GET_TYPE : /* Get card type flags (1 byte) */
|
544 | *ptr = CardType;
|
545 | res = RES_OK;
|
546 | break;
|
547 |
|
548 | case MMC_GET_CSD : /* Receive CSD as a data block (16 bytes) */
|
549 | if (send_cmd(CMD9, 0) == 0 /* READ_CSD */
|
550 | && rcvr_datablock(ptr, 16))
|
551 | res = RES_OK;
|
552 | break;
|
553 |
|
554 | case MMC_GET_CID : /* Receive CID as a data block (16 bytes) */
|
555 | if (send_cmd(CMD10, 0) == 0 /* READ_CID */
|
556 | && rcvr_datablock(ptr, 16))
|
557 | res = RES_OK;
|
558 | break;
|
559 |
|
560 | case MMC_GET_OCR : /* Receive OCR as an R3 resp (4 bytes) */
|
561 | if (send_cmd(CMD58, 0) == 0) { /* READ_OCR */
|
562 | for (n = 4; n; n--) *ptr++ = xchg_spi(0xFF);
|
563 | res = RES_OK;
|
564 | }
|
565 | break;
|
566 |
|
567 | case MMC_GET_SDSTAT : /* Receive SD statsu as a data block (64 bytes) */
|
568 | if (send_cmd(ACMD13, 0) == 0) { /* SD_STATUS */
|
569 | xchg_spi(0xFF);
|
570 | if (rcvr_datablock(ptr, 64))
|
571 | res = RES_OK;
|
572 | }
|
573 | break;
|
574 |
|
575 | default:
|
576 | res = RES_PARERR;
|
577 | }
|
578 |
|
579 | deselect();
|
580 | }
|
581 |
|
582 | return res;
|
583 | }
|
584 | #endif
|
585 |
|
586 |
|
587 | /*-----------------------------------------------------------------------*/
|
588 | /* Device Timer Interrupt Procedure */
|
589 | /*-----------------------------------------------------------------------*/
|
590 | /* This function must be called in period of 10ms */
|
591 |
|
592 | void disk_timerproc (void)
|
593 | {
|
594 | BYTE n, s;
|
595 |
|
596 |
|
597 | n = Timer1; /* 100Hz decrement timer */
|
598 | if (n) Timer1 = --n;
|
599 | n = Timer2;
|
600 | if (n) Timer2 = --n;
|
601 |
|
602 | s = Stat;
|
603 |
|
604 | // if (SOCKWP) /* Write protected */
|
605 | // s |= STA_PROTECT;
|
606 | // else /* Write enabled */
|
607 | // s &= ~STA_PROTECT;
|
608 |
|
609 | if (SD_Detect() == SD_PRESENT) /* Card inserted */
|
610 | s &= ~STA_NODISK;
|
611 | else /* Socket empty */
|
612 | s |= (STA_NODISK | STA_NOINIT);
|
613 |
|
614 | Stat = s; /* Update MMC status */
|
615 | }
|
616 |
|
617 |
|
618 | DWORD get_fattime(void)
|
619 | {
|
620 | return 0;
|
621 | }
|
