Satellite Observers Workbench. NOT yet complete, just published for forum posters to \"cherry pick\" pieces of code as requiered as an example.
flash/FatFS/diskio.c@0:0a841b89d614, 2010-10-11 (annotated)
- Committer:
- AjK
- Date:
- Mon Oct 11 10:34:55 2010 +0000
- Revision:
- 0:0a841b89d614
Totally Alpha quality as this project isn\t completed. Just publishing it as it answers many questions asked in the forums
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
AjK | 0:0a841b89d614 | 1 | /*-----------------------------------------------------------------------*/ |
AjK | 0:0a841b89d614 | 2 | /* Low level disk I/O module skeleton for FatFs (C)ChaN, 2007 */ |
AjK | 0:0a841b89d614 | 3 | /*-----------------------------------------------------------------------*/ |
AjK | 0:0a841b89d614 | 4 | /* This is a stub disk I/O module that acts as front end of the existing */ |
AjK | 0:0a841b89d614 | 5 | /* disk I/O modules and attach it to FatFs module with common interface. */ |
AjK | 0:0a841b89d614 | 6 | /*-----------------------------------------------------------------------*/ |
AjK | 0:0a841b89d614 | 7 | |
AjK | 0:0a841b89d614 | 8 | #include "diskio.h" |
AjK | 0:0a841b89d614 | 9 | #include "sowb.h" |
AjK | 0:0a841b89d614 | 10 | #include "user.h" |
AjK | 0:0a841b89d614 | 11 | #include "gpio.h" |
AjK | 0:0a841b89d614 | 12 | #include "gps.h" |
AjK | 0:0a841b89d614 | 13 | #include "ssp0.h" |
AjK | 0:0a841b89d614 | 14 | |
AjK | 0:0a841b89d614 | 15 | #define R1_IDLE_STATE (1 << 0) |
AjK | 0:0a841b89d614 | 16 | #define R1_ERASE_RESET (1 << 1) |
AjK | 0:0a841b89d614 | 17 | #define R1_ILLEGAL_COMMAND (1 << 2) |
AjK | 0:0a841b89d614 | 18 | #define R1_COM_CRC_ERROR (1 << 3) |
AjK | 0:0a841b89d614 | 19 | #define R1_ERASE_SEQUENCE_ERROR (1 << 4) |
AjK | 0:0a841b89d614 | 20 | #define R1_ADDRESS_ERROR (1 << 5) |
AjK | 0:0a841b89d614 | 21 | #define R1_PARAMETER_ERROR (1 << 6) |
AjK | 0:0a841b89d614 | 22 | |
AjK | 0:0a841b89d614 | 23 | //****************************************************************************************************************** |
AjK | 0:0a841b89d614 | 24 | // MBED SPI/CS Select functions.... Modify for your layout. |
AjK | 0:0a841b89d614 | 25 | //************************************************************************************** |
AjK | 0:0a841b89d614 | 26 | |
AjK | 0:0a841b89d614 | 27 | //SPI _spi(p5, p6, p7); // mosi, miso, sclk |
AjK | 0:0a841b89d614 | 28 | //DigitalOut _cs(p8); |
AjK | 0:0a841b89d614 | 29 | //DigitalOut P20(p20); |
AjK | 0:0a841b89d614 | 30 | //SPI * _spi; |
AjK | 0:0a841b89d614 | 31 | |
AjK | 0:0a841b89d614 | 32 | |
AjK | 0:0a841b89d614 | 33 | //****************************************************************************************************************** |
AjK | 0:0a841b89d614 | 34 | // Low Level Sector Access Function Prototypes('C' Castrated versions of Simon Ford's C++ MBED SDFileSystem class |
AjK | 0:0a841b89d614 | 35 | //****************************************************************************************************************** |
AjK | 0:0a841b89d614 | 36 | int _cmd(int cmd, int arg); |
AjK | 0:0a841b89d614 | 37 | int _cmd8(void); |
AjK | 0:0a841b89d614 | 38 | int _cmdR2(int cmd, int arg); |
AjK | 0:0a841b89d614 | 39 | int _read(BYTE *buffer, int length); |
AjK | 0:0a841b89d614 | 40 | int _write(BYTE *buffer, int length); |
AjK | 0:0a841b89d614 | 41 | int ext_bits(BYTE *data, int msb, int lsb); |
AjK | 0:0a841b89d614 | 42 | int _sd_sectors(); |
AjK | 0:0a841b89d614 | 43 | int _sectors; |
AjK | 0:0a841b89d614 | 44 | |
AjK | 0:0a841b89d614 | 45 | #define SD_COMMAND_TIMEOUT 5000 |
AjK | 0:0a841b89d614 | 46 | |
AjK | 0:0a841b89d614 | 47 | void deassert_cs(void) { |
AjK | 0:0a841b89d614 | 48 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 49 | } |
AjK | 0:0a841b89d614 | 50 | |
AjK | 0:0a841b89d614 | 51 | //****************************************************************************************************************** |
AjK | 0:0a841b89d614 | 52 | // Sector Access functions for CHAN FatFs |
AjK | 0:0a841b89d614 | 53 | //****************************************************************************************************************** |
AjK | 0:0a841b89d614 | 54 | |
AjK | 0:0a841b89d614 | 55 | DRESULT disk_ioctl ( |
AjK | 0:0a841b89d614 | 56 | BYTE drv, /* Physical drive nmuber (0..) */ |
AjK | 0:0a841b89d614 | 57 | BYTE ctrl, /* Control code */ |
AjK | 0:0a841b89d614 | 58 | void *buff /* Buffer to send/receive control data */ |
AjK | 0:0a841b89d614 | 59 | ) |
AjK | 0:0a841b89d614 | 60 | { |
AjK | 0:0a841b89d614 | 61 | DRESULT res; |
AjK | 0:0a841b89d614 | 62 | |
AjK | 0:0a841b89d614 | 63 | switch(ctrl) |
AjK | 0:0a841b89d614 | 64 | { |
AjK | 0:0a841b89d614 | 65 | case CTRL_SYNC: |
AjK | 0:0a841b89d614 | 66 | res = RES_OK; |
AjK | 0:0a841b89d614 | 67 | break; |
AjK | 0:0a841b89d614 | 68 | |
AjK | 0:0a841b89d614 | 69 | case GET_SECTOR_SIZE: |
AjK | 0:0a841b89d614 | 70 | res = RES_OK; |
AjK | 0:0a841b89d614 | 71 | *(WORD *)buff = 512; |
AjK | 0:0a841b89d614 | 72 | break; |
AjK | 0:0a841b89d614 | 73 | |
AjK | 0:0a841b89d614 | 74 | case GET_SECTOR_COUNT: |
AjK | 0:0a841b89d614 | 75 | res = RES_OK; |
AjK | 0:0a841b89d614 | 76 | *(DWORD *)buff = (WORD)_sd_sectors(); |
AjK | 0:0a841b89d614 | 77 | break; |
AjK | 0:0a841b89d614 | 78 | |
AjK | 0:0a841b89d614 | 79 | case GET_BLOCK_SIZE: |
AjK | 0:0a841b89d614 | 80 | res = RES_OK; |
AjK | 0:0a841b89d614 | 81 | *(DWORD *)buff = 1; |
AjK | 0:0a841b89d614 | 82 | break; |
AjK | 0:0a841b89d614 | 83 | |
AjK | 0:0a841b89d614 | 84 | default: |
AjK | 0:0a841b89d614 | 85 | res = RES_OK; |
AjK | 0:0a841b89d614 | 86 | break; |
AjK | 0:0a841b89d614 | 87 | } |
AjK | 0:0a841b89d614 | 88 | return res; |
AjK | 0:0a841b89d614 | 89 | } |
AjK | 0:0a841b89d614 | 90 | |
AjK | 0:0a841b89d614 | 91 | int _cmd58() { |
AjK | 0:0a841b89d614 | 92 | SDCARD_CS_ASSERT; //_cs = 0; |
AjK | 0:0a841b89d614 | 93 | int arg = 0; |
AjK | 0:0a841b89d614 | 94 | |
AjK | 0:0a841b89d614 | 95 | /* Request use of SSP0. */ |
AjK | 0:0a841b89d614 | 96 | while(!SSP0_request()) WHILE_WAITING_DO_PROCESS_FUNCTIONS; |
AjK | 0:0a841b89d614 | 97 | |
AjK | 0:0a841b89d614 | 98 | // send a command |
AjK | 0:0a841b89d614 | 99 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 100 | SSP0_WRITE_BYTE(0x40 | 58); |
AjK | 0:0a841b89d614 | 101 | SSP0_WRITE_BYTE(arg >> 24); |
AjK | 0:0a841b89d614 | 102 | SSP0_WRITE_BYTE(arg >> 16); |
AjK | 0:0a841b89d614 | 103 | SSP0_WRITE_BYTE(arg >> 8); |
AjK | 0:0a841b89d614 | 104 | SSP0_WRITE_BYTE(arg >> 0); |
AjK | 0:0a841b89d614 | 105 | SSP0_WRITE_BYTE(0x95); |
AjK | 0:0a841b89d614 | 106 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 107 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 108 | |
AjK | 0:0a841b89d614 | 109 | //_spi->write(0x40 | 58); |
AjK | 0:0a841b89d614 | 110 | //_spi->write(arg >> 24); |
AjK | 0:0a841b89d614 | 111 | //_spi->write(arg >> 16); |
AjK | 0:0a841b89d614 | 112 | //_spi->write(arg >> 8); |
AjK | 0:0a841b89d614 | 113 | //_spi->write(arg >> 0); |
AjK | 0:0a841b89d614 | 114 | //_spi->write(0x95); |
AjK | 0:0a841b89d614 | 115 | |
AjK | 0:0a841b89d614 | 116 | // wait for the repsonse (response[7] == 0) |
AjK | 0:0a841b89d614 | 117 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 118 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 119 | for(int i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
AjK | 0:0a841b89d614 | 120 | int response = LPC_SSP0->DR; |
AjK | 0:0a841b89d614 | 121 | if(!(response & 0x80)) { |
AjK | 0:0a841b89d614 | 122 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 123 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 124 | int ocr = LPC_SSP0->DR << 24; |
AjK | 0:0a841b89d614 | 125 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 126 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 127 | ocr |= LPC_SSP0->DR << 16; |
AjK | 0:0a841b89d614 | 128 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 129 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 130 | ocr |= LPC_SSP0->DR << 8; |
AjK | 0:0a841b89d614 | 131 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 132 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 133 | ocr |= LPC_SSP0->DR << 0; |
AjK | 0:0a841b89d614 | 134 | // printf("OCR = 0x%08X\n", ocr); |
AjK | 0:0a841b89d614 | 135 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 136 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 137 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 138 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 139 | // _spi->write(0xFF); |
AjK | 0:0a841b89d614 | 140 | SSP0_release(); |
AjK | 0:0a841b89d614 | 141 | return response; |
AjK | 0:0a841b89d614 | 142 | } |
AjK | 0:0a841b89d614 | 143 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 144 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 145 | } |
AjK | 0:0a841b89d614 | 146 | SDCARD_CS_DEASSERT; |
AjK | 0:0a841b89d614 | 147 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 148 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 149 | SSP0_release(); |
AjK | 0:0a841b89d614 | 150 | return -1; // timeout |
AjK | 0:0a841b89d614 | 151 | } |
AjK | 0:0a841b89d614 | 152 | |
AjK | 0:0a841b89d614 | 153 | int initialise_card_v1() { |
AjK | 0:0a841b89d614 | 154 | |
AjK | 0:0a841b89d614 | 155 | /* Request use of SSP0. */ |
AjK | 0:0a841b89d614 | 156 | while(!SSP0_request()) WHILE_WAITING_DO_PROCESS_FUNCTIONS; |
AjK | 0:0a841b89d614 | 157 | |
AjK | 0:0a841b89d614 | 158 | for(int i=0; i<SD_COMMAND_TIMEOUT; i++) { |
AjK | 0:0a841b89d614 | 159 | _cmd(55, 0); |
AjK | 0:0a841b89d614 | 160 | if(_cmd(41, 0) == 0) { |
AjK | 0:0a841b89d614 | 161 | SSP0_release(); |
AjK | 0:0a841b89d614 | 162 | return 0; //SDCARD_V1; |
AjK | 0:0a841b89d614 | 163 | } |
AjK | 0:0a841b89d614 | 164 | } |
AjK | 0:0a841b89d614 | 165 | |
AjK | 0:0a841b89d614 | 166 | //fprintf(stderr, "Timeout waiting for v1.x card\n"); |
AjK | 0:0a841b89d614 | 167 | SSP0_release(); |
AjK | 0:0a841b89d614 | 168 | return STA_NOINIT; |
AjK | 0:0a841b89d614 | 169 | } |
AjK | 0:0a841b89d614 | 170 | |
AjK | 0:0a841b89d614 | 171 | int initialise_card_v2() { |
AjK | 0:0a841b89d614 | 172 | int c41, c58, r; |
AjK | 0:0a841b89d614 | 173 | |
AjK | 0:0a841b89d614 | 174 | /* Request use of SSP0. */ |
AjK | 0:0a841b89d614 | 175 | while(!SSP0_request()) WHILE_WAITING_DO_PROCESS_FUNCTIONS; |
AjK | 0:0a841b89d614 | 176 | |
AjK | 0:0a841b89d614 | 177 | for(int i=0; i<SD_COMMAND_TIMEOUT; i++) { |
AjK | 0:0a841b89d614 | 178 | _cmd(55, 0); |
AjK | 0:0a841b89d614 | 179 | c41 = _cmd(41, 0); |
AjK | 0:0a841b89d614 | 180 | if(c41 == 0) { |
AjK | 0:0a841b89d614 | 181 | SSP0_release(); |
AjK | 0:0a841b89d614 | 182 | c58 = _cmd58(); |
AjK | 0:0a841b89d614 | 183 | //fprintf(stderr, "C41 returned %02x and C58 returned %02x\r\n", c41, c58); |
AjK | 0:0a841b89d614 | 184 | return 0; //SDCARD_V2; |
AjK | 0:0a841b89d614 | 185 | } |
AjK | 0:0a841b89d614 | 186 | } |
AjK | 0:0a841b89d614 | 187 | |
AjK | 0:0a841b89d614 | 188 | |
AjK | 0:0a841b89d614 | 189 | //fprintf(stderr, "Timeout waiting for v2.x card response=0x%04x\r\n", c41); |
AjK | 0:0a841b89d614 | 190 | SSP0_release(); |
AjK | 0:0a841b89d614 | 191 | return STA_NOINIT; |
AjK | 0:0a841b89d614 | 192 | } |
AjK | 0:0a841b89d614 | 193 | |
AjK | 0:0a841b89d614 | 194 | DSTATUS disk_initialize(BYTE Drive) { |
AjK | 0:0a841b89d614 | 195 | int i, cmd8_r; |
AjK | 0:0a841b89d614 | 196 | uint32_t cpsr = LPC_SSP0->CPSR; |
AjK | 0:0a841b89d614 | 197 | |
AjK | 0:0a841b89d614 | 198 | //_spi = new SPI(p5, p6, p7); |
AjK | 0:0a841b89d614 | 199 | |
AjK | 0:0a841b89d614 | 200 | /* Request use of SSP0. */ |
AjK | 0:0a841b89d614 | 201 | while(!SSP0_request()) WHILE_WAITING_DO_PROCESS_FUNCTIONS; |
AjK | 0:0a841b89d614 | 202 | |
AjK | 0:0a841b89d614 | 203 | //_spi->frequency(100000); // Set to 100kHz for initialisation |
AjK | 0:0a841b89d614 | 204 | LPC_SSP0->CPSR = 0x64; |
AjK | 0:0a841b89d614 | 205 | SDCARD_CS_ASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 206 | |
AjK | 0:0a841b89d614 | 207 | // Initialise the card by clocking it a bit (cs = 1) |
AjK | 0:0a841b89d614 | 208 | for(int i=0; i < 16; i++) { |
AjK | 0:0a841b89d614 | 209 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 210 | } |
AjK | 0:0a841b89d614 | 211 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 212 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 213 | |
AjK | 0:0a841b89d614 | 214 | |
AjK | 0:0a841b89d614 | 215 | |
AjK | 0:0a841b89d614 | 216 | // send CMD0, should return with all zeros except IDLE STATE set (bit 0) |
AjK | 0:0a841b89d614 | 217 | if(_cmd(0, 0) != 0x01) { |
AjK | 0:0a841b89d614 | 218 | //fprintf(stderr, "Not in idle state\n"); |
AjK | 0:0a841b89d614 | 219 | SSP0_release(); |
AjK | 0:0a841b89d614 | 220 | return STA_NOINIT; |
AjK | 0:0a841b89d614 | 221 | } |
AjK | 0:0a841b89d614 | 222 | |
AjK | 0:0a841b89d614 | 223 | for(i = 0; i < SD_COMMAND_TIMEOUT; i++) { |
AjK | 0:0a841b89d614 | 224 | cmd8_r = _cmd8(); |
AjK | 0:0a841b89d614 | 225 | if (cmd8_r == 0 || cmd8_r == 1 || cmd8_r == R1_ILLEGAL_COMMAND) break; |
AjK | 0:0a841b89d614 | 226 | if (cmd8_r == 0 || cmd8_r == R1_ILLEGAL_COMMAND) break; |
AjK | 0:0a841b89d614 | 227 | } |
AjK | 0:0a841b89d614 | 228 | |
AjK | 0:0a841b89d614 | 229 | if ( (cmd8_r & R1_ILLEGAL_COMMAND) != 0) { |
AjK | 0:0a841b89d614 | 230 | //fprintf(stderr, "V1 %d\r\n", cmd8_r); |
AjK | 0:0a841b89d614 | 231 | SSP0_release(); |
AjK | 0:0a841b89d614 | 232 | return initialise_card_v1(); |
AjK | 0:0a841b89d614 | 233 | } |
AjK | 0:0a841b89d614 | 234 | |
AjK | 0:0a841b89d614 | 235 | if (cmd8_r == 0 || cmd8_r == 1) { |
AjK | 0:0a841b89d614 | 236 | //fprintf(stderr, "V2 %d\r\n", cmd8_r); |
AjK | 0:0a841b89d614 | 237 | SSP0_release(); |
AjK | 0:0a841b89d614 | 238 | return initialise_card_v2(); |
AjK | 0:0a841b89d614 | 239 | } |
AjK | 0:0a841b89d614 | 240 | |
AjK | 0:0a841b89d614 | 241 | |
AjK | 0:0a841b89d614 | 242 | //fprintf(stderr, "Not in idle state after sending CMD8 (not an SD card?) response = %d\r\n", cmd8_r); |
AjK | 0:0a841b89d614 | 243 | SSP0_release(); |
AjK | 0:0a841b89d614 | 244 | return STA_NOINIT; |
AjK | 0:0a841b89d614 | 245 | |
AjK | 0:0a841b89d614 | 246 | // ACMD41 to give host capacity support (repeat until not busy) |
AjK | 0:0a841b89d614 | 247 | // ACMD41 is application specific command, so we send APP_CMD (CMD55) beforehand |
AjK | 0:0a841b89d614 | 248 | for(int i=0;; i++) { |
AjK | 0:0a841b89d614 | 249 | _cmd(55, 0); |
AjK | 0:0a841b89d614 | 250 | int response = _cmd(41, 0); |
AjK | 0:0a841b89d614 | 251 | if(response == 0) { |
AjK | 0:0a841b89d614 | 252 | break; |
AjK | 0:0a841b89d614 | 253 | } else if(i > SD_COMMAND_TIMEOUT) { |
AjK | 0:0a841b89d614 | 254 | //fprintf(stderr, "Timeout waiting for card\n"); |
AjK | 0:0a841b89d614 | 255 | SSP0_release(); |
AjK | 0:0a841b89d614 | 256 | return STA_NOINIT; |
AjK | 0:0a841b89d614 | 257 | } |
AjK | 0:0a841b89d614 | 258 | } |
AjK | 0:0a841b89d614 | 259 | |
AjK | 0:0a841b89d614 | 260 | _sectors = _sd_sectors(); |
AjK | 0:0a841b89d614 | 261 | |
AjK | 0:0a841b89d614 | 262 | // Set block length to 512 (CMD16) |
AjK | 0:0a841b89d614 | 263 | if(_cmd(16, 512) != 0) { |
AjK | 0:0a841b89d614 | 264 | //fprintf(stderr, "Set block timeout\n"); |
AjK | 0:0a841b89d614 | 265 | SSP0_release(); |
AjK | 0:0a841b89d614 | 266 | return STA_NOINIT; |
AjK | 0:0a841b89d614 | 267 | } |
AjK | 0:0a841b89d614 | 268 | |
AjK | 0:0a841b89d614 | 269 | LPC_SSP0->CPSR = cpsr; |
AjK | 0:0a841b89d614 | 270 | SSP0_release(); |
AjK | 0:0a841b89d614 | 271 | //_spi->frequency(10000000); // Set to 10MHz for data transfer |
AjK | 0:0a841b89d614 | 272 | return 0; |
AjK | 0:0a841b89d614 | 273 | } |
AjK | 0:0a841b89d614 | 274 | |
AjK | 0:0a841b89d614 | 275 | DRESULT disk_write(BYTE Drive,const BYTE * Buffer, DWORD SectorNumber, BYTE SectorCount) |
AjK | 0:0a841b89d614 | 276 | { |
AjK | 0:0a841b89d614 | 277 | BYTE i; |
AjK | 0:0a841b89d614 | 278 | |
AjK | 0:0a841b89d614 | 279 | BYTE * MyBufOut = (BYTE *)Buffer; |
AjK | 0:0a841b89d614 | 280 | |
AjK | 0:0a841b89d614 | 281 | /* Request use of SSP0. */ |
AjK | 0:0a841b89d614 | 282 | while(!SSP0_request()) WHILE_WAITING_DO_PROCESS_FUNCTIONS; |
AjK | 0:0a841b89d614 | 283 | |
AjK | 0:0a841b89d614 | 284 | for(i=0;i<SectorCount;i++) |
AjK | 0:0a841b89d614 | 285 | { |
AjK | 0:0a841b89d614 | 286 | // set write address for single block (CMD24) |
AjK | 0:0a841b89d614 | 287 | if(_cmd(24, (SectorNumber + i) * 512 ) != 0) { |
AjK | 0:0a841b89d614 | 288 | SSP0_release(); |
AjK | 0:0a841b89d614 | 289 | return RES_ERROR; |
AjK | 0:0a841b89d614 | 290 | } |
AjK | 0:0a841b89d614 | 291 | |
AjK | 0:0a841b89d614 | 292 | // send the data block |
AjK | 0:0a841b89d614 | 293 | _write(MyBufOut, 512); |
AjK | 0:0a841b89d614 | 294 | |
AjK | 0:0a841b89d614 | 295 | MyBufOut+=512; |
AjK | 0:0a841b89d614 | 296 | } |
AjK | 0:0a841b89d614 | 297 | |
AjK | 0:0a841b89d614 | 298 | SSP0_release(); |
AjK | 0:0a841b89d614 | 299 | return RES_OK; |
AjK | 0:0a841b89d614 | 300 | } |
AjK | 0:0a841b89d614 | 301 | |
AjK | 0:0a841b89d614 | 302 | DRESULT disk_read(BYTE Drive, BYTE * Buffer,DWORD SectorNumber, BYTE SectorCount) |
AjK | 0:0a841b89d614 | 303 | { |
AjK | 0:0a841b89d614 | 304 | BYTE i; |
AjK | 0:0a841b89d614 | 305 | |
AjK | 0:0a841b89d614 | 306 | /* Request use of SSP0. */ |
AjK | 0:0a841b89d614 | 307 | while(!SSP0_request()) WHILE_WAITING_DO_PROCESS_FUNCTIONS; |
AjK | 0:0a841b89d614 | 308 | |
AjK | 0:0a841b89d614 | 309 | for(i=0;i<SectorCount;i++) |
AjK | 0:0a841b89d614 | 310 | { |
AjK | 0:0a841b89d614 | 311 | // set read address for single block (CMD17) |
AjK | 0:0a841b89d614 | 312 | if(_cmd(17, (SectorNumber+i) * 512) != 0) |
AjK | 0:0a841b89d614 | 313 | { |
AjK | 0:0a841b89d614 | 314 | SSP0_release(); |
AjK | 0:0a841b89d614 | 315 | return RES_ERROR; |
AjK | 0:0a841b89d614 | 316 | } |
AjK | 0:0a841b89d614 | 317 | // receive the data |
AjK | 0:0a841b89d614 | 318 | _read(Buffer, 512); |
AjK | 0:0a841b89d614 | 319 | |
AjK | 0:0a841b89d614 | 320 | Buffer+=512; |
AjK | 0:0a841b89d614 | 321 | } |
AjK | 0:0a841b89d614 | 322 | |
AjK | 0:0a841b89d614 | 323 | SSP0_release(); |
AjK | 0:0a841b89d614 | 324 | return RES_OK; |
AjK | 0:0a841b89d614 | 325 | } |
AjK | 0:0a841b89d614 | 326 | |
AjK | 0:0a841b89d614 | 327 | |
AjK | 0:0a841b89d614 | 328 | extern "C" DWORD get_fattime(void) { |
AjK | 0:0a841b89d614 | 329 | GPS_TIME the_time; |
AjK | 0:0a841b89d614 | 330 | |
AjK | 0:0a841b89d614 | 331 | gps_get_time(&the_time); |
AjK | 0:0a841b89d614 | 332 | |
AjK | 0:0a841b89d614 | 333 | uint32_t year = (the_time.year - 1980) << 25; |
AjK | 0:0a841b89d614 | 334 | uint32_t month = the_time.month << 21; |
AjK | 0:0a841b89d614 | 335 | uint32_t day = the_time.day << 16; |
AjK | 0:0a841b89d614 | 336 | uint32_t hour = the_time.hour << 11; |
AjK | 0:0a841b89d614 | 337 | uint32_t minute = the_time.minute << 5; |
AjK | 0:0a841b89d614 | 338 | uint32_t second = (the_time.second / 2) &0xF; |
AjK | 0:0a841b89d614 | 339 | return (DWORD)(year | month | day | hour | minute | second); |
AjK | 0:0a841b89d614 | 340 | } |
AjK | 0:0a841b89d614 | 341 | |
AjK | 0:0a841b89d614 | 342 | DSTATUS disk_status(BYTE Drive) |
AjK | 0:0a841b89d614 | 343 | { |
AjK | 0:0a841b89d614 | 344 | return 0; |
AjK | 0:0a841b89d614 | 345 | } |
AjK | 0:0a841b89d614 | 346 | |
AjK | 0:0a841b89d614 | 347 | //************************************************************************************** |
AjK | 0:0a841b89d614 | 348 | // Low Level Sector Access Functions (Castrated versions of Simon Fords C++ MBED class |
AjK | 0:0a841b89d614 | 349 | //************************************************************************************** |
AjK | 0:0a841b89d614 | 350 | |
AjK | 0:0a841b89d614 | 351 | int _cmd(int cmd, int arg) { |
AjK | 0:0a841b89d614 | 352 | volatile int delay; |
AjK | 0:0a841b89d614 | 353 | |
AjK | 0:0a841b89d614 | 354 | for (delay = 500; delay; delay--); |
AjK | 0:0a841b89d614 | 355 | SDCARD_CS_ASSERT; //_cs = 0; |
AjK | 0:0a841b89d614 | 356 | for (delay = 500; delay; delay--); |
AjK | 0:0a841b89d614 | 357 | |
AjK | 0:0a841b89d614 | 358 | // send a command |
AjK | 0:0a841b89d614 | 359 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 360 | SSP0_WRITE_BYTE(0x40 | cmd); |
AjK | 0:0a841b89d614 | 361 | SSP0_WRITE_BYTE(arg >> 24); |
AjK | 0:0a841b89d614 | 362 | SSP0_WRITE_BYTE(arg >> 16); |
AjK | 0:0a841b89d614 | 363 | SSP0_WRITE_BYTE(arg >> 8); |
AjK | 0:0a841b89d614 | 364 | SSP0_WRITE_BYTE(arg >> 0); |
AjK | 0:0a841b89d614 | 365 | SSP0_WRITE_BYTE(0x95); |
AjK | 0:0a841b89d614 | 366 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 367 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 368 | |
AjK | 0:0a841b89d614 | 369 | //_spi->write(0x40 | cmd); |
AjK | 0:0a841b89d614 | 370 | //_spi->write(arg >> 24); |
AjK | 0:0a841b89d614 | 371 | //_spi->write(arg >> 16); |
AjK | 0:0a841b89d614 | 372 | //_spi->write(arg >> 8); |
AjK | 0:0a841b89d614 | 373 | //_spi->write(arg >> 0); |
AjK | 0:0a841b89d614 | 374 | //_spi->write(0x95); |
AjK | 0:0a841b89d614 | 375 | |
AjK | 0:0a841b89d614 | 376 | // wait for the repsonse (response[7] == 0) |
AjK | 0:0a841b89d614 | 377 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 378 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 379 | for(int i=0; i<SD_COMMAND_TIMEOUT; i++) { |
AjK | 0:0a841b89d614 | 380 | int response = LPC_SSP0->DR; |
AjK | 0:0a841b89d614 | 381 | if(!(response & 0x80)) { |
AjK | 0:0a841b89d614 | 382 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 383 | return response; |
AjK | 0:0a841b89d614 | 384 | } |
AjK | 0:0a841b89d614 | 385 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 386 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 387 | } |
AjK | 0:0a841b89d614 | 388 | |
AjK | 0:0a841b89d614 | 389 | SDCARD_CS_ASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 390 | return -1; // timeout |
AjK | 0:0a841b89d614 | 391 | } |
AjK | 0:0a841b89d614 | 392 | |
AjK | 0:0a841b89d614 | 393 | int _cmdR2(int cmd, int arg) { |
AjK | 0:0a841b89d614 | 394 | int response; |
AjK | 0:0a841b89d614 | 395 | |
AjK | 0:0a841b89d614 | 396 | SDCARD_CS_ASSERT; //_cs = 0; |
AjK | 0:0a841b89d614 | 397 | |
AjK | 0:0a841b89d614 | 398 | // send a command |
AjK | 0:0a841b89d614 | 399 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 400 | SSP0_WRITE_BYTE(0x40 | cmd); |
AjK | 0:0a841b89d614 | 401 | SSP0_WRITE_BYTE(arg >> 24); |
AjK | 0:0a841b89d614 | 402 | SSP0_WRITE_BYTE(arg >> 16); |
AjK | 0:0a841b89d614 | 403 | SSP0_WRITE_BYTE(arg >> 8); |
AjK | 0:0a841b89d614 | 404 | SSP0_WRITE_BYTE(arg >> 0); |
AjK | 0:0a841b89d614 | 405 | SSP0_WRITE_BYTE(0x95); |
AjK | 0:0a841b89d614 | 406 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 407 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 408 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 409 | |
AjK | 0:0a841b89d614 | 410 | //_spi->write(0x40 | cmd); |
AjK | 0:0a841b89d614 | 411 | //_spi->write(arg >> 24); |
AjK | 0:0a841b89d614 | 412 | //_spi->write(arg >> 16); |
AjK | 0:0a841b89d614 | 413 | //_spi->write(arg >> 8); |
AjK | 0:0a841b89d614 | 414 | //_spi->write(arg >> 0); |
AjK | 0:0a841b89d614 | 415 | //_spi->write(0x95); |
AjK | 0:0a841b89d614 | 416 | //_spi->write(0xFF); |
AjK | 0:0a841b89d614 | 417 | |
AjK | 0:0a841b89d614 | 418 | // wait for the repsonse (response[7] == 0) |
AjK | 0:0a841b89d614 | 419 | //for(int i=0; i<SD_COMMAND_TIMEOUT; i++) { |
AjK | 0:0a841b89d614 | 420 | response = 0; |
AjK | 0:0a841b89d614 | 421 | SSP0_WRITE_BYTE(0x00); |
AjK | 0:0a841b89d614 | 422 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 423 | response = (LPC_SSP0->DR & 0xFF); |
AjK | 0:0a841b89d614 | 424 | response = (response << 8) & 0xFF00; |
AjK | 0:0a841b89d614 | 425 | SSP0_WRITE_BYTE(0x00); |
AjK | 0:0a841b89d614 | 426 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 427 | response |= (LPC_SSP0->DR & 0xFF); |
AjK | 0:0a841b89d614 | 428 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 429 | return response; |
AjK | 0:0a841b89d614 | 430 | //} |
AjK | 0:0a841b89d614 | 431 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 432 | return -1; // timeout |
AjK | 0:0a841b89d614 | 433 | } |
AjK | 0:0a841b89d614 | 434 | |
AjK | 0:0a841b89d614 | 435 | int _cmd8(void) { |
AjK | 0:0a841b89d614 | 436 | SDCARD_CS_ASSERT; //_cs = 0; |
AjK | 0:0a841b89d614 | 437 | |
AjK | 0:0a841b89d614 | 438 | // send a command |
AjK | 0:0a841b89d614 | 439 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 440 | SSP0_WRITE_BYTE(0x40 | 8); |
AjK | 0:0a841b89d614 | 441 | SSP0_WRITE_BYTE(00); |
AjK | 0:0a841b89d614 | 442 | SSP0_WRITE_BYTE(00); |
AjK | 0:0a841b89d614 | 443 | SSP0_WRITE_BYTE(01); |
AjK | 0:0a841b89d614 | 444 | SSP0_WRITE_BYTE(0xAA); |
AjK | 0:0a841b89d614 | 445 | SSP0_WRITE_BYTE(0x87); |
AjK | 0:0a841b89d614 | 446 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 447 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 448 | |
AjK | 0:0a841b89d614 | 449 | //_spi->write(0x40 | 8); // CMD8 |
AjK | 0:0a841b89d614 | 450 | //_spi->write(0x00); // reserved |
AjK | 0:0a841b89d614 | 451 | //_spi->write(0x00); // reserved |
AjK | 0:0a841b89d614 | 452 | //_spi->write(0x01); // 3.3v |
AjK | 0:0a841b89d614 | 453 | //_spi->write(0xAA); // check pattern |
AjK | 0:0a841b89d614 | 454 | //_spi->write(0x87); // crc |
AjK | 0:0a841b89d614 | 455 | |
AjK | 0:0a841b89d614 | 456 | // wait for the repsonse (response[7] == 0) |
AjK | 0:0a841b89d614 | 457 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 458 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 459 | for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) { |
AjK | 0:0a841b89d614 | 460 | char response[5]; |
AjK | 0:0a841b89d614 | 461 | response[0] = LPC_SSP0->DR; |
AjK | 0:0a841b89d614 | 462 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 463 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 464 | for(int j=1; j<5; j++) { |
AjK | 0:0a841b89d614 | 465 | response[i] = LPC_SSP0->DR; |
AjK | 0:0a841b89d614 | 466 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 467 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 468 | } |
AjK | 0:0a841b89d614 | 469 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 470 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 471 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 472 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 473 | return response[0]; |
AjK | 0:0a841b89d614 | 474 | } |
AjK | 0:0a841b89d614 | 475 | |
AjK | 0:0a841b89d614 | 476 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 477 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 478 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 479 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 480 | //_spi->write(0xFF); |
AjK | 0:0a841b89d614 | 481 | return -1; // timeout |
AjK | 0:0a841b89d614 | 482 | } |
AjK | 0:0a841b89d614 | 483 | |
AjK | 0:0a841b89d614 | 484 | int _cmd8original(void) { |
AjK | 0:0a841b89d614 | 485 | SDCARD_CS_ASSERT; //_cs = 0; |
AjK | 0:0a841b89d614 | 486 | |
AjK | 0:0a841b89d614 | 487 | // send a command |
AjK | 0:0a841b89d614 | 488 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 489 | SSP0_WRITE_BYTE(0x40 | 8); |
AjK | 0:0a841b89d614 | 490 | SSP0_WRITE_BYTE(00); |
AjK | 0:0a841b89d614 | 491 | SSP0_WRITE_BYTE(00); |
AjK | 0:0a841b89d614 | 492 | SSP0_WRITE_BYTE(01); |
AjK | 0:0a841b89d614 | 493 | SSP0_WRITE_BYTE(0xAA); |
AjK | 0:0a841b89d614 | 494 | SSP0_WRITE_BYTE(0x87); |
AjK | 0:0a841b89d614 | 495 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 496 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 497 | |
AjK | 0:0a841b89d614 | 498 | //_spi->write(0x40 | 8); // CMD8 |
AjK | 0:0a841b89d614 | 499 | //_spi->write(0x00); // reserved |
AjK | 0:0a841b89d614 | 500 | //_spi->write(0x00); // reserved |
AjK | 0:0a841b89d614 | 501 | //_spi->write(0x01); // 3.3v |
AjK | 0:0a841b89d614 | 502 | //_spi->write(0xAA); // check pattern |
AjK | 0:0a841b89d614 | 503 | //_spi->write(0x87); // crc |
AjK | 0:0a841b89d614 | 504 | |
AjK | 0:0a841b89d614 | 505 | // wait for the repsonse (response[7] == 0) |
AjK | 0:0a841b89d614 | 506 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 507 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 508 | for(int i=0; i<SD_COMMAND_TIMEOUT * 1000; i++) { |
AjK | 0:0a841b89d614 | 509 | char response[5]; |
AjK | 0:0a841b89d614 | 510 | response[0] = LPC_SSP0->DR; |
AjK | 0:0a841b89d614 | 511 | if(!(response[0] & 0x80)) { |
AjK | 0:0a841b89d614 | 512 | //fprintf(stderr, "RS = %d\r\n", response[0]); |
AjK | 0:0a841b89d614 | 513 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 514 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 515 | for(int j=1; j<5; j++) { |
AjK | 0:0a841b89d614 | 516 | response[i] = LPC_SSP0->DR; |
AjK | 0:0a841b89d614 | 517 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 518 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 519 | } |
AjK | 0:0a841b89d614 | 520 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 521 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 522 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 523 | //_spi->write(0xFF); |
AjK | 0:0a841b89d614 | 524 | return response[0]; |
AjK | 0:0a841b89d614 | 525 | } |
AjK | 0:0a841b89d614 | 526 | } |
AjK | 0:0a841b89d614 | 527 | |
AjK | 0:0a841b89d614 | 528 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 529 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 530 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 531 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 532 | //_spi->write(0xFF); |
AjK | 0:0a841b89d614 | 533 | return -1; // timeout |
AjK | 0:0a841b89d614 | 534 | } |
AjK | 0:0a841b89d614 | 535 | |
AjK | 0:0a841b89d614 | 536 | int _read(BYTE *buffer, int length) { |
AjK | 0:0a841b89d614 | 537 | SDCARD_CS_ASSERT; //_cs = 0; |
AjK | 0:0a841b89d614 | 538 | |
AjK | 0:0a841b89d614 | 539 | // read until start byte (0xFF) |
AjK | 0:0a841b89d614 | 540 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 541 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 542 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 543 | while(LPC_SSP0->DR != 0xFE) { |
AjK | 0:0a841b89d614 | 544 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 545 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 546 | } |
AjK | 0:0a841b89d614 | 547 | |
AjK | 0:0a841b89d614 | 548 | // read data |
AjK | 0:0a841b89d614 | 549 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 550 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 551 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 552 | for(int i=0; i<length; i++) { |
AjK | 0:0a841b89d614 | 553 | buffer[i] = LPC_SSP0->DR; |
AjK | 0:0a841b89d614 | 554 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 555 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 556 | } |
AjK | 0:0a841b89d614 | 557 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 558 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 559 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 560 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 561 | //_spi->write(0xFF); // checksum |
AjK | 0:0a841b89d614 | 562 | //_spi->write(0xFF); |
AjK | 0:0a841b89d614 | 563 | |
AjK | 0:0a841b89d614 | 564 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 565 | return 0; |
AjK | 0:0a841b89d614 | 566 | } |
AjK | 0:0a841b89d614 | 567 | |
AjK | 0:0a841b89d614 | 568 | int _write(BYTE *buffer, int length) { |
AjK | 0:0a841b89d614 | 569 | SDCARD_CS_ASSERT; //_cs = 0; |
AjK | 0:0a841b89d614 | 570 | |
AjK | 0:0a841b89d614 | 571 | // indicate start of block |
AjK | 0:0a841b89d614 | 572 | SSP0_WRITE_BYTE(0xFE); |
AjK | 0:0a841b89d614 | 573 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 574 | //_spi->write(0xFE); |
AjK | 0:0a841b89d614 | 575 | |
AjK | 0:0a841b89d614 | 576 | // write the data |
AjK | 0:0a841b89d614 | 577 | for(int i=0; i<length; i++) { |
AjK | 0:0a841b89d614 | 578 | SSP0_WRITE_BYTE(buffer[i]); |
AjK | 0:0a841b89d614 | 579 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 580 | //_spi->write(buffer[i]); |
AjK | 0:0a841b89d614 | 581 | } |
AjK | 0:0a841b89d614 | 582 | |
AjK | 0:0a841b89d614 | 583 | // write the checksum |
AjK | 0:0a841b89d614 | 584 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 585 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 586 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 587 | //_spi->write(0xFF); |
AjK | 0:0a841b89d614 | 588 | //_spi->write(0xFF); |
AjK | 0:0a841b89d614 | 589 | |
AjK | 0:0a841b89d614 | 590 | // check the repsonse token |
AjK | 0:0a841b89d614 | 591 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 592 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 593 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 594 | if((LPC_SSP0->DR & 0x1F) != 0x05) { |
AjK | 0:0a841b89d614 | 595 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 596 | return 1; |
AjK | 0:0a841b89d614 | 597 | } |
AjK | 0:0a841b89d614 | 598 | |
AjK | 0:0a841b89d614 | 599 | // wait for write to finish |
AjK | 0:0a841b89d614 | 600 | SSP0_FLUSH_RX_FIFO; |
AjK | 0:0a841b89d614 | 601 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 602 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 603 | while(LPC_SSP0->DR == 0) { |
AjK | 0:0a841b89d614 | 604 | SSP0_WRITE_BYTE(0xFF); |
AjK | 0:0a841b89d614 | 605 | while(SSP0_IS_BUSY); |
AjK | 0:0a841b89d614 | 606 | } |
AjK | 0:0a841b89d614 | 607 | |
AjK | 0:0a841b89d614 | 608 | SDCARD_CS_DEASSERT; //_cs = 1; |
AjK | 0:0a841b89d614 | 609 | return 0; |
AjK | 0:0a841b89d614 | 610 | } |
AjK | 0:0a841b89d614 | 611 | |
AjK | 0:0a841b89d614 | 612 | int ext_bits(BYTE *data, int msb, int lsb) { |
AjK | 0:0a841b89d614 | 613 | int bits = 0; |
AjK | 0:0a841b89d614 | 614 | int size = 1 + msb - lsb; |
AjK | 0:0a841b89d614 | 615 | for(int i=0; i<size; i++) { |
AjK | 0:0a841b89d614 | 616 | int position = lsb + i; |
AjK | 0:0a841b89d614 | 617 | int byte = 15 - (position >> 3); |
AjK | 0:0a841b89d614 | 618 | int bit = position & 0x7; |
AjK | 0:0a841b89d614 | 619 | int value = (data[byte] >> bit) & 1; |
AjK | 0:0a841b89d614 | 620 | bits |= value << i; |
AjK | 0:0a841b89d614 | 621 | } |
AjK | 0:0a841b89d614 | 622 | return bits; |
AjK | 0:0a841b89d614 | 623 | } |
AjK | 0:0a841b89d614 | 624 | |
AjK | 0:0a841b89d614 | 625 | int _sd_sectors() { |
AjK | 0:0a841b89d614 | 626 | |
AjK | 0:0a841b89d614 | 627 | // CMD9, Response R2 (R1 byte + 16-byte block read) |
AjK | 0:0a841b89d614 | 628 | if(_cmd(9, 0) != 0) { |
AjK | 0:0a841b89d614 | 629 | //fprintf(stderr, "Didn't get a response from the disk\n"); |
AjK | 0:0a841b89d614 | 630 | return 0; |
AjK | 0:0a841b89d614 | 631 | } |
AjK | 0:0a841b89d614 | 632 | |
AjK | 0:0a841b89d614 | 633 | BYTE csd[16]; |
AjK | 0:0a841b89d614 | 634 | if(_read(csd, 16) != 0) { |
AjK | 0:0a841b89d614 | 635 | //fprintf(stderr, "Couldn't read csd response from disk\n"); |
AjK | 0:0a841b89d614 | 636 | return 0; |
AjK | 0:0a841b89d614 | 637 | } |
AjK | 0:0a841b89d614 | 638 | |
AjK | 0:0a841b89d614 | 639 | // csd_structure : csd[127:126] |
AjK | 0:0a841b89d614 | 640 | // c_size : csd[73:62] |
AjK | 0:0a841b89d614 | 641 | // c_size_mult : csd[49:47] |
AjK | 0:0a841b89d614 | 642 | // read_bl_len : csd[83:80] |
AjK | 0:0a841b89d614 | 643 | |
AjK | 0:0a841b89d614 | 644 | int csd_structure = ext_bits(csd, 127, 126); |
AjK | 0:0a841b89d614 | 645 | int c_size = ext_bits(csd, 73, 62); |
AjK | 0:0a841b89d614 | 646 | int c_size_mult = ext_bits(csd, 49, 47); |
AjK | 0:0a841b89d614 | 647 | int read_bl_len = ext_bits(csd, 83, 80); |
AjK | 0:0a841b89d614 | 648 | |
AjK | 0:0a841b89d614 | 649 | if(csd_structure != 0) { |
AjK | 0:0a841b89d614 | 650 | //fprintf(stderr, "This disk tastes funny! I only know about type 0 CSD structures"); |
AjK | 0:0a841b89d614 | 651 | return 0; |
AjK | 0:0a841b89d614 | 652 | } |
AjK | 0:0a841b89d614 | 653 | |
AjK | 0:0a841b89d614 | 654 | int blocks = (c_size + 1) * (1 << (c_size_mult + 2)); |
AjK | 0:0a841b89d614 | 655 | int block_size = 1 << read_bl_len; |
AjK | 0:0a841b89d614 | 656 | |
AjK | 0:0a841b89d614 | 657 | if(block_size != 512) { |
AjK | 0:0a841b89d614 | 658 | //fprintf(stderr, "This disk tastes funny! I only like 512 byte blocks (%d)\r\n",block_size); |
AjK | 0:0a841b89d614 | 659 | return 0; |
AjK | 0:0a841b89d614 | 660 | } |
AjK | 0:0a841b89d614 | 661 | |
AjK | 0:0a841b89d614 | 662 | return blocks; |
AjK | 0:0a841b89d614 | 663 | } |
AjK | 0:0a841b89d614 | 664 |