diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_sd_common.c')
| -rw-r--r-- | c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_sd_common.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_sd_common.c b/c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_sd_common.c deleted file mode 100644 index 86dd37355b..0000000000 --- a/c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_sd_common.c +++ /dev/null @@ -1,210 +0,0 @@ -/* - io_sd_common.c - - By chishm (Michael Chisholm) - - Common SD card routines - - SD routines partially based on sd.s by Romman - - Copyright (c) 2006 Michael "Chishm" Chisholm - - Redistribution and use in source and binary forms, with or without modification, - are permitted provided that the following conditions are met: - - 1. Redistributions of source code must retain the above copyright notice, - this list of conditions and the following disclaimer. - 2. Redistributions in binary form must reproduce the above copyright notice, - this list of conditions and the following disclaimer in the documentation and/or - other materials provided with the distribution. - 3. The name of the author may not be used to endorse or promote products derived - from this software without specific prior written permission. - - THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED - WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY - AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE - LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, - EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - 2006-08-07 - Chishm - * Moved the SD initialization to a common function - * Increased timeouts for slower cards - - 2006-08-08 - Chishm - * Init aborts when it doesn't get a valid response to APP_CMD - speeds up detection when no card is inserted -*/ - -#include "io_sd_common.h" - -#define MAX_STARTUP_TRIES 1000 // Arbitrary value, check if the card is ready 20 times before giving up -#define RESPONSE_TIMEOUT 256 // Number of clocks sent to the SD card before giving up - -/* -Improved CRC7 function provided by cory1492 -Calculates the CRC of an SD command, and includes the end bit in the byte -*/ -u8 _SD_CRC7(u8* data, int cnt) { - int i, a; - u8 crc, temp; - - crc = 0; - for (a = 0; a < cnt; a++) - { - temp = data[a]; - for (i = 0; i < 8; i++) - { - crc <<= 1; - if ((temp & 0x80) ^ (crc & 0x80)) crc ^= 0x09; - temp <<= 1; - } - } - crc = (crc << 1) | 1; - return(crc); -} - -/* -Calculates the CRC16 for a sector of data. Calculates it -as 4 separate lots, merged into one buffer. This is used -for 4 SD data lines, not for 1 data line alone. -*/ -void _SD_CRC16 (u8* buff, int buffLength, u8* crc16buff) { - u32 a, b, c, d; - int count; - u32 bitPattern = 0x80808080; // r7 - u32 crcConst = 0x1021; // r8 - u32 dataByte = 0; // r2 - - a = 0; // r3 - b = 0; // r4 - c = 0; // r5 - d = 0; // r6 - - buffLength = buffLength * 8; - - - do { - if (bitPattern & 0x80) dataByte = *buff++; - - a = a << 1; - if ( a & 0x10000) a ^= crcConst; - if (dataByte & (bitPattern >> 24)) a ^= crcConst; - - b = b << 1; - if (b & 0x10000) b ^= crcConst; - if (dataByte & (bitPattern >> 25)) b ^= crcConst; - - c = c << 1; - if (c & 0x10000) c ^= crcConst; - if (dataByte & (bitPattern >> 26)) c ^= crcConst; - - d = d << 1; - if (d & 0x10000) d ^= crcConst; - if (dataByte & (bitPattern >> 27)) d ^= crcConst; - - bitPattern = (bitPattern >> 4) | (bitPattern << 28); - } while (buffLength-=4); - - count = 16; // r8 - - do { - bitPattern = bitPattern << 4; - if (a & 0x8000) bitPattern |= 8; - if (b & 0x8000) bitPattern |= 4; - if (c & 0x8000) bitPattern |= 2; - if (d & 0x8000) bitPattern |= 1; - - a = a << 1; - b = b << 1; - c = c << 1; - d = d << 1; - - count--; - - if (!(count & 0x01)) { - *crc16buff++ = (u8)(bitPattern & 0xff); - } - } while (count != 0); - - return; -} - -/* -Initialise the SD card, after it has been sent into an Idle state -cmd_6byte_response: a pointer to a function that sends the SD card a command and gets a 6 byte response -cmd_17byte_response: a pointer to a function that sends the SD card a command and gets a 17 byte response -use4bitBus: initialise card to use a 4 bit data bus when communicating with the card -RCA: a pointer to the location to store the card's Relative Card Address, preshifted up by 16 bits. -*/ -bool _SD_InitCard (_SD_FN_CMD_6BYTE_RESPONSE cmd_6byte_response, - _SD_FN_CMD_17BYTE_RESPONSE cmd_17byte_response, - bool use4bitBus, - u32 *RCA) -{ - u8 responseBuffer[17] = {0}; - int i; - - for (i = 0; i < MAX_STARTUP_TRIES ; i++) { - cmd_6byte_response (responseBuffer, APP_CMD, 0); - // Check that the card gave the correct response - if (responseBuffer[0] != APP_CMD) { - return false; - } - if ( - cmd_6byte_response (responseBuffer, SD_APP_OP_COND, SD_OCR_VALUE) && - ((responseBuffer[1] & 0x80) != 0)) - { - // Card is ready to receive commands now - break; - } - } - if (i >= MAX_STARTUP_TRIES) { - return false; - } - - // The card's name, as assigned by the manufacturer - cmd_17byte_response (responseBuffer, ALL_SEND_CID, 0); - - // Get a new address - for (i = 0; i < MAX_STARTUP_TRIES ; i++) { - cmd_6byte_response (responseBuffer, SEND_RELATIVE_ADDR, 0); - *RCA = (responseBuffer[1] << 24) | (responseBuffer[2] << 16); - if ((responseBuffer[3] & 0x1e) != (SD_STATE_STBY << 1)) { - break; - } - } - if (i >= MAX_STARTUP_TRIES) { - return false; - } - - // Some cards won't go to higher speeds unless they think you checked their capabilities - cmd_17byte_response (responseBuffer, SEND_CSD, *RCA); - - // Only this card should respond to all future commands - cmd_6byte_response (responseBuffer, SELECT_CARD, *RCA); - - if (use4bitBus) { - // Set a 4 bit data bus - cmd_6byte_response (responseBuffer, APP_CMD, *RCA); - cmd_6byte_response (responseBuffer, SET_BUS_WIDTH, 2); // 4-bit mode. - } - - // Use 512 byte blocks - cmd_6byte_response (responseBuffer, SET_BLOCKLEN, 512); // 512 byte blocks - - // Wait until card is ready for data - i = 0; - do { - if (i >= RESPONSE_TIMEOUT) { - return false; - } - i++; - } while (!cmd_6byte_response (responseBuffer, SEND_STATUS, *RCA) && ((responseBuffer[3] & 0x1f) != ((SD_STATE_TRAN << 1) | READY_FOR_DATA))); - - return true; -} - - |