diff options
Diffstat (limited to '')
| -rw-r--r-- | c/src/lib/libbsp/arm/nds/libfat/source/disc_io/io_sd_common.c | 60 |
1 files changed, 30 insertions, 30 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 index 24f6873c3d..86dd37355b 100644 --- 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 @@ -5,10 +5,10 @@ Common SD card routines - SD routines partially based on sd.s by Romman + 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: @@ -29,11 +29,11 @@ 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 */ @@ -64,10 +64,10 @@ u8 _SD_CRC7(u8* data, int cnt) { } crc = (crc << 1) | 1; return(crc); -} +} /* -Calculates the CRC16 for a sector of data. Calculates it +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. */ @@ -82,53 +82,53 @@ void _SD_CRC16 (u8* buff, int buffLength, u8* crc16buff) { 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; } @@ -139,24 +139,24 @@ cmd_17byte_response: a pointer to a function that sends the SD card a command an 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, +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 ( + if ( cmd_6byte_response (responseBuffer, SD_APP_OP_COND, SD_OCR_VALUE) && ((responseBuffer[1] & 0x80) != 0)) - { + { // Card is ready to receive commands now break; } @@ -164,10 +164,10 @@ bool _SD_InitCard (_SD_FN_CMD_6BYTE_RESPONSE cmd_6byte_response, 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); @@ -182,10 +182,10 @@ bool _SD_InitCard (_SD_FN_CMD_6BYTE_RESPONSE cmd_6byte_response, // 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); @@ -194,7 +194,7 @@ bool _SD_InitCard (_SD_FN_CMD_6BYTE_RESPONSE cmd_6byte_response, // Use 512 byte blocks cmd_6byte_response (responseBuffer, SET_BLOCKLEN, 512); // 512 byte blocks - + // Wait until card is ready for data i = 0; do { @@ -203,7 +203,7 @@ bool _SD_InitCard (_SD_FN_CMD_6BYTE_RESPONSE cmd_6byte_response, } i++; } while (!cmd_6byte_response (responseBuffer, SEND_STATUS, *RCA) && ((responseBuffer[3] & 0x1f) != ((SD_STATE_TRAN << 1) | READY_FOR_DATA))); - + return true; } |