From 8bf1f6e7fbbc5325dcbd4910e5389928942458a4 Mon Sep 17 00:00:00 2001 From: Michael Chisholm Date: Sat, 22 Jul 2006 12:16:40 +0000 Subject: [PATCH] Added SCSD support. Fixed a few FAT errors. --- source/disc_io/disc.c | 6 +- source/disc_io/io_m3sd.c | 21 ++-- source/disc_io/io_mmcf.c | 2 +- source/disc_io/io_nmmc.c | 14 +-- source/disc_io/io_scsd.c | 188 ++++++++++++--------------------- source/disc_io/io_scsd.h | 3 + source/disc_io/io_scsd_s.s | 128 ++++++++++++++++++++++ source/disc_io/io_sd_common.h | 1 + source/file_allocation_table.c | 30 ++++-- source/partition.c | 4 +- 10 files changed, 244 insertions(+), 153 deletions(-) create mode 100644 source/disc_io/io_scsd_s.s diff --git a/source/disc_io/disc.c b/source/disc_io/disc.c index ae2c671..f655601 100644 --- a/source/disc_io/disc.c +++ b/source/disc_io/disc.c @@ -84,12 +84,12 @@ IO_INTERFACE* ioInterfaces[] = { #ifdef NDS // Place Slot 1 (DS Card) interfaces here - &_io_nmmc, + &_io_nmmc, #endif // Place Slot 2 (GBA Cart) interfaces here - &_io_mpcf, &_io_m3cf, &_io_m3sd, &_io_sccf, &_io_fcsr + &_io_mpcf, &_io_m3cf, &_io_sccf, &_io_scsd, &_io_m3sd, &_io_fcsr // Experimental Slot 2 interfaces - , &_io_mmcf, &_io_scsd, &_io_efa2 + , &_io_mmcf, &_io_efa2 }; /* diff --git a/source/disc_io/io_m3sd.c b/source/disc_io/io_m3sd.c index 031eeb5..5a58608 100644 --- a/source/disc_io/io_m3sd.c +++ b/source/disc_io/io_m3sd.c @@ -47,14 +47,14 @@ //--------------------------------------------------------------- // Send / receive timeouts, to stop infinite wait loops -#define MAX_STARTUP_TRIES 100 // Arbitrary value, check if the card is ready 100 times before giving up +#define MAX_STARTUP_TRIES 10 // Arbitrary value, check if the card is ready 10 times before giving up #define NUM_STARTUP_CLOCKS 100 // Number of empty (0xFF when sending) bytes to send/receive to/from the card -#define TRANSMIT_TIMEOUT 0x100 // Time to wait for the M3 to respond to transmit or receive requests +#define TRANSMIT_TIMEOUT 2000 // Time to wait for the M3 to respond to transmit or receive requests #define RESPONSE_TIMEOUT 256 // Number of clocks sent to the SD card before giving up //--------------------------------------------------------------- // Variables required for tracking SD state -static u32 relativeCardAddress = 0; // Preshifted Relative Card Address +static u32 _M3SD_relativeCardAddress = 0; // Preshifted Relative Card Address //--------------------------------------------------------------- // Internal M3 SD functions @@ -239,9 +239,9 @@ static bool _M3SD_initCard (void) { } _M3SD_getClocks (NUM_STARTUP_CLOCKS); - + // Card is now reset, including it's address - relativeCardAddress = 0; + _M3SD_relativeCardAddress = 0; for (i = 0; i < MAX_STARTUP_TRIES ; i++) { _M3SD_sendCommand (APP_CMD, 0); @@ -265,18 +265,18 @@ static bool _M3SD_initCard (void) { // Get a new address _M3SD_sendCommand (SEND_RELATIVE_ADDR, 0); _M3SD_getResponse_R6 (responseBuffer); - relativeCardAddress = (responseBuffer[1] << 24) | (responseBuffer[2] << 16); + _M3SD_relativeCardAddress = (responseBuffer[1] << 24) | (responseBuffer[2] << 16); // Some cards won't go to higher speeds unless they think you checked their capabilities - _M3SD_sendCommand (SEND_CSD, relativeCardAddress); + _M3SD_sendCommand (SEND_CSD, _M3SD_relativeCardAddress); _M3SD_getResponse_R2 (responseBuffer); // Only this card should respond to all future commands - _M3SD_sendCommand (SELECT_CARD, relativeCardAddress); + _M3SD_sendCommand (SELECT_CARD, _M3SD_relativeCardAddress); _M3SD_getResponse_R1 (responseBuffer); // Set a 4 bit data bus - _M3SD_sendCommand (APP_CMD, relativeCardAddress); + _M3SD_sendCommand (APP_CMD, _M3SD_relativeCardAddress); _M3SD_getResponse_R1 (responseBuffer); _M3SD_sendCommand (SET_BUS_WIDTH, 2); @@ -293,9 +293,8 @@ static bool _M3SD_initCard (void) { return false; } i++; - _M3SD_sendCommand (SEND_STATUS, relativeCardAddress); + _M3SD_sendCommand (SEND_STATUS, _M3SD_relativeCardAddress); } while ((!_M3SD_getResponse_R1 (responseBuffer)) && ((responseBuffer[3] & 0x1f) != ((SD_STATE_TRAN << 1) | READY_FOR_DATA))); - return true; } diff --git a/source/disc_io/io_mmcf.c b/source/disc_io/io_mmcf.c index 91fa4e5..78c52a2 100644 --- a/source/disc_io/io_mmcf.c +++ b/source/disc_io/io_mmcf.c @@ -62,7 +62,7 @@ #define REG_MMCF_LBA3 ((vu16*)0x080A0000) // 3rd byte of sector address #define REG_MMCF_LBA4 ((vu16*)0x080C0000) // last nibble of sector address | 0xE0 -#define REG_MMCF_DATA ((vu16*)0x09000000) // Pointer to buffer of CF data transered from card +#define REG_MMCF_DATA ((vu16*)0x08000000) // Pointer to buffer of CF data transered from card static const CF_REGISTERS _MMCF_Registers = { REG_MMCF_DATA, diff --git a/source/disc_io/io_nmmc.c b/source/disc_io/io_nmmc.c index fd0451c..1f5fe3a 100644 --- a/source/disc_io/io_nmmc.c +++ b/source/disc_io/io_nmmc.c @@ -25,7 +25,7 @@ #include -int spi_freq = 3; +int _NMMC_spi_freq = 3; #define MK2_CONFIG_ZIP_RAM_CLOSE (1 << 5) #define MK2_CONFIG_GAME_FLASH_CLOSE ((1 << 4) | (1 << 0)) @@ -61,13 +61,13 @@ static inline void _Neo_CloseSPI ( void ) } static inline void _Neo_MK2GameMode() { - _Neo_OpenSPI(spi_freq); // Enable DS Card's SPI port + _Neo_OpenSPI(_NMMC_spi_freq); // Enable DS Card's SPI port _Neo_SPI(0xF1); // Switch to game mode _Neo_CloseSPI(); // Disable DS Card's SPI port } static inline void _Neo_EnableEEPROM( bool enable ) { - _Neo_OpenSPI(spi_freq); + _Neo_OpenSPI(_NMMC_spi_freq); if(enable) _Neo_SPI(0x06); else _Neo_SPI(0x0E); _Neo_CloseSPI(); @@ -75,7 +75,7 @@ static inline void _Neo_EnableEEPROM( bool enable ) { static void _Neo_WriteMK2Config(u8 config) { _Neo_EnableEEPROM(true); - _Neo_OpenSPI(spi_freq); + _Neo_OpenSPI(_NMMC_spi_freq); _Neo_SPI(0xFA); // Send mem conf write command _Neo_SPI(0x01); // Send high byte (0x01) _Neo_SPI(config); // Send low byte @@ -87,7 +87,7 @@ static u8 _Neo_ReadMK2Config(void) { u8 config; _Neo_EnableEEPROM(true); - _Neo_OpenSPI(spi_freq); + _Neo_OpenSPI(_NMMC_spi_freq); _Neo_SPI(0xf8); // Send mem conf read command _Neo_SPI(0x01); // Send high byte config = _Neo_SPI(0x00); // Get low byte @@ -118,7 +118,7 @@ static void _Neo_EnableMMC( bool enable ) } else { _Neo_SelectMMC (1); _Neo_SelectMMC (1); - _Neo_OpenSPI (spi_freq); + _Neo_OpenSPI (_NMMC_spi_freq); } return; } @@ -246,7 +246,7 @@ bool _NMMC_startUp(void) { _Neo_SPI(0xFF); } if ((transSpeed & 0xf0) >= 0x30) { - spi_freq = 0; + _NMMC_spi_freq = 0; } _Neo_EnableMMC( false ); diff --git a/source/disc_io/io_scsd.c b/source/disc_io/io_scsd.c index 0b54ea9..a9aca81 100644 --- a/source/disc_io/io_scsd.c +++ b/source/disc_io/io_scsd.c @@ -29,6 +29,9 @@ 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. + + 2006-07-22 - Chishm + * First release of stable code */ #include "io_scsd.h" @@ -58,15 +61,18 @@ // Send / receive timeouts, to stop infinite wait loops #define MAX_STARTUP_TRIES 100 // Arbitrary value, check if the card is ready 100 times before giving up #define NUM_STARTUP_CLOCKS 100 // Number of empty (0xFF when sending) bytes to send/receive to/from the card -#define TRANSMIT_TIMEOUT 0x100 // Time to wait for the M3 to respond to transmit or receive requests +#define TRANSMIT_TIMEOUT 10000 // Time to wait for the SC to respond to transmit or receive requests #define RESPONSE_TIMEOUT 256 // Number of clocks sent to the SD card before giving up #define BUSY_WAIT_TIMEOUT 500000 +#define WRITE_TIMEOUT 10000 // Time to wait for the card to finish writing //--------------------------------------------------------------- // Variables required for tracking SD state -static u32 relativeCardAddress = 0; // Preshifted Relative Card Address +static u32 _SCSD_relativeCardAddress = 0; // Preshifted Relative Card Address //--------------------------------------------------------------- -// Internal M3 SD functions +// Internal SC SD functions + +extern bool _SCSD_writeData_s (u8 *data, u16* crc); static inline void _SCSD_unlock (void) { _SC_changeMode (SC_MODE_MEDIA); @@ -97,81 +103,57 @@ static bool _SCSD_sendCommand (u8 command, u32 argument) { tempDataPtr = databuff; - do { + while (length--) { dataByte = *tempDataPtr++; for (curBit = 7; curBit >=0; curBit--){ REG_SCSD_CMD = dataByte; dataByte = dataByte << 1; } - } while (length--); - - return true; -} - -static u8 _SCSD_getByte (void) { - // With every 16 bit read to REG_SCSD_CMD, read a single bit. - u32 res = 0; - int i; - - for (i = 1; i < 8; i++) { - res = (res << 1) | REG_SCSD_CMD; } - return (u8)res; + return true; } // Returns the response from the SD card to a previous command. static bool _SCSD_getResponse (u8* dest, u32 length) { u32 i; - u8 dataByte; - int shiftAmount; + int dataByte; + int numBits = length * 8; // Wait for the card to be non-busy - for (i = 0; i < RESPONSE_TIMEOUT; i++) { - dataByte = _SCSD_getByte(); - if (dataByte != SD_CARD_BUSY) { - break; - } - } - + i = BUSY_WAIT_TIMEOUT; + while (((REG_SCSD_CMD & 0x01) != 0) && (--i)); if (dest == NULL) { return true; } - // Still busy after the timeout has passed - if (dataByte == 0xff) { + if (i == 0) { + // Still busy after the timeout has passed return false; } - - // Read response into buffer - for ( i = 0; i < length; i++) { - dest[i] = dataByte; - dataByte = _SCSD_getByte(); - } - // dataByte will contain the last piece of the response - - // Send 16 more clocks, 8 more than the delay required between a response and the next command - i = _SCSD_getByte(); - i = _SCSD_getByte(); - // Shift response so that the bytes are correctly aligned - // The register may not contain properly aligned data - for (shiftAmount = 0; ((dest[0] << shiftAmount) & 0x80) != 0x00; shiftAmount++) { - if (shiftAmount >= 7) { - return false; + // The first bit is always 0 + dataByte = 0; + numBits--; + // Read the remaining bits in the response. + // It's always most significant bit first + while (numBits--) { + dataByte = (dataByte << 1) | (REG_SCSD_CMD & 0x01); + if ((numBits & 0x7) == 0) { + // It's read a whole byte, so store it + *dest++ = (u8)dataByte; + dataByte = 0; } } - - for (i = 0; i < length - 1; i++) { - dest[i] = (dest[i] << shiftAmount) | (dest[i+1] >> (8-shiftAmount)); - } - // Get the last piece of the response from dataByte - dest[i] = (dest[i] << shiftAmount) | (dataByte >> (8-shiftAmount)); + // Send 16 more clocks, 8 more than the delay required between a response and the next command + for (i = 0; i < 16; i++) { + dataByte = REG_SCSD_CMD; + } + return true; } - static inline bool _SCSD_getResponse_R1 (u8* dest) { return _SCSD_getResponse (dest, 6); } @@ -200,23 +182,21 @@ static void _SCSD_sendClocks (u32 numClocks) { } static bool _SCSD_initCard (void) { -//iprintf ("init card\n"); int i; - u8 responseBuffer[17]; // sizeof 17 to hold the maximum response size possible + u8 responseBuffer[17] = {0}; // sizeof 17 to hold the maximum response size possible // Give the card time to stabilise _SCSD_sendClocks (NUM_STARTUP_CLOCKS); // Reset the card if (!_SCSD_sendCommand (GO_IDLE_STATE, 0)) { -//iprintf ("can't idle\n"); return false; } _SCSD_sendClocks (NUM_STARTUP_CLOCKS); // Card is now reset, including it's address - relativeCardAddress = 0; + _SCSD_relativeCardAddress = 0; for (i = 0; i < MAX_STARTUP_TRIES ; i++) { _SCSD_sendCommand (APP_CMD, 0); @@ -230,10 +210,9 @@ static bool _SCSD_initCard (void) { } if (i >= MAX_STARTUP_TRIES) { -//iprintf ("timeout on OP_COND\n"); return false; } - + // The card's name, as assigned by the manufacturer _SCSD_sendCommand (ALL_SEND_CID, 0); _SCSD_getResponse_R2 (responseBuffer); @@ -241,19 +220,18 @@ static bool _SCSD_initCard (void) { // Get a new address _SCSD_sendCommand (SEND_RELATIVE_ADDR, 0); _SCSD_getResponse_R6 (responseBuffer); - relativeCardAddress = (responseBuffer[1] << 24) | (responseBuffer[2] << 16); -//iprintf ("Relative Address: %08X\n", relativeCardAddress); + _SCSD_relativeCardAddress = (responseBuffer[1] << 24) | (responseBuffer[2] << 16); // Some cards won't go to higher speeds unless they think you checked their capabilities - _SCSD_sendCommand (SEND_CSD, relativeCardAddress); + _SCSD_sendCommand (SEND_CSD, _SCSD_relativeCardAddress); _SCSD_getResponse_R2 (responseBuffer); // Only this card should respond to all future commands - _SCSD_sendCommand (SELECT_CARD, relativeCardAddress); + _SCSD_sendCommand (SELECT_CARD, _SCSD_relativeCardAddress); _SCSD_getResponse_R1 (responseBuffer); // Set a 4 bit data bus - _SCSD_sendCommand (APP_CMD, relativeCardAddress); + _SCSD_sendCommand (APP_CMD, _SCSD_relativeCardAddress); _SCSD_getResponse_R1 (responseBuffer); _SCSD_sendCommand (SET_BUS_WIDTH, 2); @@ -267,11 +245,10 @@ static bool _SCSD_initCard (void) { i = 0; do { if (i >= RESPONSE_TIMEOUT) { -//iprintf ("timeout on SEND_STATUS\n"); return false; } i++; - _SCSD_sendCommand (SEND_STATUS, relativeCardAddress); + _SCSD_sendCommand (SEND_STATUS, _SCSD_relativeCardAddress); } while ((!_SCSD_getResponse_R1 (responseBuffer)) && ((responseBuffer[3] & 0x1f) != ((SD_STATE_TRAN << 1) | READY_FOR_DATA))); return true; @@ -280,7 +257,7 @@ static bool _SCSD_initCard (void) { static bool _SCSD_readData (void* buffer) { u8* buff_u8 = (u8*)buffer; u16* buff = (u16*)buffer; - u32 temp; + volatile register u32 temp; int i; i = BUSY_WAIT_TIMEOUT; @@ -291,18 +268,18 @@ static bool _SCSD_readData (void* buffer) { i=256; if ((u32)buff_u8 & 0x01) { - while(i--) - { + while(i--) { temp = REG_SCSD_DATAREAD_32; temp = REG_SCSD_DATAREAD_32 >> 16; *buff_u8++ = (u8)temp; *buff_u8++ = (u8)(temp >> 8); } } else { - while(i--) + while(i--) { temp = REG_SCSD_DATAREAD_32; temp = REG_SCSD_DATAREAD_32 >> 16; - *buff++ = (u16)temp; + *buff++ = temp; + } } @@ -315,52 +292,6 @@ static bool _SCSD_readData (void* buffer) { return true; } -static bool _SCSD_writeData (u8* data, u8* crc) { - int pos; - u16 dataHWord; - u16 temp; - - while ((REG_SCSD_DATAREAD & SCSD_STS_BUSY) == 0); - - temp = REG_SCSD_DATAREAD; - - REG_SCSD_DATAWRITE = 0; // start bit; - - pos = BYTES_PER_READ / 2; - while (pos--) { - dataHWord = data[0] | (data[1] << 8); - data+=2; - - REG_SCSD_DATAWRITE = dataHWord; - REG_SCSD_DATAWRITE = dataHWord << 4; - REG_SCSD_DATAWRITE = dataHWord << 8; - REG_SCSD_DATAWRITE = dataHWord << 12; - } - - if (crc != 0) { - pos = 4; - while (pos--) { - dataHWord = *crc++; - - REG_SCSD_DATAWRITE = dataHWord; - REG_SCSD_DATAWRITE = dataHWord << 4; - REG_SCSD_DATAWRITE = dataHWord << 8; - REG_SCSD_DATAWRITE = dataHWord << 12; - } - } - - REG_SCSD_DATAWRITE = 0xff; // end bit - - while ((REG_SCSD_DATAREAD & SCSD_STS_BUSY) == 0); - - temp = REG_SCSD_DATAREAD; - temp = REG_SCSD_DATAREAD; - temp = REG_SCSD_DATAREAD; - temp = REG_SCSD_DATAREAD; - - return true; -} - //--------------------------------------------------------------- // Functions needed for the external interface @@ -423,34 +354,47 @@ bool _SCSD_readSectors (u32 sector, u32 numSectors, void* buffer) { } bool _SCSD_writeSectors (u32 sector, u32 numSectors, const void* buffer) { - u16 crcBuff[4]; - u8* crc = (u8*)crcBuff; // Force crcBuff to be halfword aligned + u16 crc[4]; // One per data line u8 responseBuffer[6]; u32 offset = sector * BYTES_PER_READ; u8* data = (u8*) buffer; + int i; while (numSectors--) { + // Calculate the CRC16 + _SD_CRC16 ( data, BYTES_PER_READ, (u8*)crc); + // Send write command and get a response _SCSD_sendCommand (WRITE_BLOCK, offset); if (!_SCSD_getResponse_R1 (responseBuffer)) { return false; } - + // Send the data and CRC - _SD_CRC16 ( data, BYTES_PER_READ, crc); - if (! _SCSD_writeData( data, crc)) { + if (! _SCSD_writeData_s (data, crc)) { return false; } - + // Send a few clocks to the SD card _SCSD_sendClocks(0x10); offset += BYTES_PER_READ; data += BYTES_PER_READ; + + // Wait until card is finished programming + i = WRITE_TIMEOUT; + responseBuffer[3] = 0; + do { + _SCSD_sendCommand (SEND_STATUS, _SCSD_relativeCardAddress); + _SCSD_getResponse_R1 (responseBuffer); + i--; + if (i <= 0) { + return false; + } + } while (((responseBuffer[3] & 0x1f) != ((SD_STATE_TRAN << 1) | READY_FOR_DATA))); } return true; - } bool _SCSD_clearStatus (void) { diff --git a/source/disc_io/io_scsd.h b/source/disc_io/io_scsd.h index 0789e0c..1f40d5e 100644 --- a/source/disc_io/io_scsd.h +++ b/source/disc_io/io_scsd.h @@ -29,6 +29,9 @@ 2006-07-11 - Chishm * Original release + + 2006-07-22 - Chishm + * First release of stable code */ #ifndef IO_SCSD_H diff --git a/source/disc_io/io_scsd_s.s b/source/disc_io/io_scsd_s.s new file mode 100644 index 0000000..c3c633c --- /dev/null +++ b/source/disc_io/io_scsd_s.s @@ -0,0 +1,128 @@ +@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ +@ io_scsd_s.s +@ +@ Hardware Routines for reading a Secure Digital card +@ using the SC SD +@ +@ Based on code supplied 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. +@ +@ 2006-07-22 - Chishm +@ * First release of stable code +@ +@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ + + .align 4 + .arm + + .equ REG_SCSD_DATAWRITE, 0x09000000 + .equ BYTES_PER_READ, 0x200 + .equ SCSD_STS_BUSY, 0x100 + .equ BUSY_WAIT_TIMEOUT, 0x10000 + .equ FALSE, 0 + .equ TRUE, 1 + +@ bool _SCSD_writeData_s (u8 *data, u16* crc) + + .global _SCSD_writeData_s + +_SCSD_writeData_s: + stmfd r13!, {r4-r5} + mov r5, #BYTES_PER_READ + mov r2, #REG_SCSD_DATAWRITE + +@ Wait for a free data buffer on the SD card + mov r4, #BUSY_WAIT_TIMEOUT +_SCSD_writeData_busy_wait: + @ Test for timeout + subs r4, r4, #1 + moveq r0, #FALSE @ return false on failure + beq _SCSD_writeData_return + @ Check the busy bit of the status register + ldrh r3, [r2] + tst r3, #SCSD_STS_BUSY + beq _SCSD_writeData_busy_wait + + ldrh r3, [r2] @ extra clock + + mov r3, #0 @ start bit + strh r3,[r2] + +@ Check if the data buffer is aligned on a halfword boundary + tst r0, #1 + beq _SCSD_writeData_data_loop + +@ Used when the source data is unaligned +_SCSD_writeData_data_loop_unaligned: + ldrb r3, [r0], #1 + ldrb r4, [r0], #1 + orr r3, r3, r4, lsl #8 + stmia r2, {r3-r4} + subs r5, r5, #2 + bne _SCSD_writeData_data_loop_unaligned + b _SCSD_writeData_crc + +@ Write the data to the card +@ 4 halfwords are transmitted to the Supercard at once, for timing purposes +@ Only the first halfword needs to contain data +_SCSD_writeData_data_loop: + ldrh r3, [r0], #2 + stmia r2, {r3-r4} + subs r5, r5, #2 + bne _SCSD_writeData_data_loop + +@ Send the data CRC +_SCSD_writeData_crc: + cmp r1, #0 + movne r0, r1 + movne r1, #0 + movne r5, #8 + bne _SCSD_writeData_data_loop + + mov r3, #0xff @ end bit + strh r3, [r2] + +@ Wait for the SD card to signal that it is finished recieving + mov r4, #BUSY_WAIT_TIMEOUT +_SCSD_writeData_finished_wait: + @ Test for timeout + subs r4, r4, #1 + moveq r0, #FALSE @ return false on failure + beq _SCSD_writeData_return + @ Check the busy bit of the status register + ldrh r3, [r2] + tst r3, #0x100 + bne _SCSD_writeData_finished_wait + +@ Send 8 more clocks, as required by the SD card + ldmia r2, {r3-r4} + +@ return true for success + mov r0, #TRUE + +_SCSD_writeData_return: + ldmfd r13!,{r4-r5} + bx r14 + diff --git a/source/disc_io/io_sd_common.h b/source/disc_io/io_sd_common.h index a0710dd..0d17257 100644 --- a/source/disc_io/io_sd_common.h +++ b/source/disc_io/io_sd_common.h @@ -52,6 +52,7 @@ #define READ_SINGLE_BLOCK 17 #define READ_MULTIPLE_BLOCK 18 #define WRITE_BLOCK 24 +#define WRITE_MULTIPLE_BLOCK 25 #define APP_CMD 55 /* SD App commands */ diff --git a/source/file_allocation_table.c b/source/file_allocation_table.c index 9ac8cf5..df3a2aa 100644 --- a/source/file_allocation_table.c +++ b/source/file_allocation_table.c @@ -28,6 +28,9 @@ 2006-07-11 - Chishm * Original release + + 2006-07-11 - Chishm + * Made several fixes related to free clusters, thanks to Loopy */ @@ -202,6 +205,7 @@ u32 _FAT_fat_linkFreeCluster(PARTITION* partition, u32 cluster) { u32 firstFree; u32 curLink; u32 lastCluster; + bool loopedAroundFAT = false; lastCluster = partition->fat.lastCluster; @@ -211,7 +215,7 @@ u32 _FAT_fat_linkFreeCluster(PARTITION* partition, u32 cluster) { // Check if the cluster already has a link, and return it if so curLink = _FAT_fat_nextCluster(partition, cluster); - if ((curLink >= CLUSTER_FIRST) && (curLink < lastCluster)) { + if ((curLink >= CLUSTER_FIRST) && (curLink <= lastCluster)) { return curLink; // Return the current link - don't allocate a new one } @@ -223,13 +227,20 @@ u32 _FAT_fat_linkFreeCluster(PARTITION* partition, u32 cluster) { } // Search until a free cluster is found - while ((_FAT_fat_nextCluster(partition, firstFree) != CLUSTER_FREE) && (firstFree <= lastCluster)) { + while (_FAT_fat_nextCluster(partition, firstFree) != CLUSTER_FREE) { firstFree++; - } - if (firstFree > lastCluster) { - // If couldn't get a free cluster then return, saying this fact - partition->fat.firstFree = firstFree; - return CLUSTER_FREE; + if (firstFree > lastCluster) { + if (loopedAroundFAT) { + // If couldn't get a free cluster then return, saying this fact + partition->fat.firstFree = firstFree; + return CLUSTER_FREE; + } else { + // Try looping back to the beginning of the FAT + // This was suggested by loopy + firstFree = CLUSTER_FIRST; + loopedAroundFAT = true; + } + } } partition->fat.firstFree = firstFree; @@ -253,6 +264,11 @@ bool _FAT_fat_clearLinks (PARTITION* partition, u32 cluster) { if ((cluster < 0x0002) || (cluster > partition->fat.lastCluster)) return false; + + // If this clears up more space in the FAT before the current free pointer, move it backwards + if (cluster < partition->fat.firstFree) { + partition->fat.firstFree = cluster; + } while ((cluster != CLUSTER_EOF) && (cluster != CLUSTER_FREE)) { // Store next cluster before erasing the link diff --git a/source/partition.c b/source/partition.c index 6b759b0..b7fe964 100644 --- a/source/partition.c +++ b/source/partition.c @@ -112,7 +112,7 @@ static PARTITION* _FAT_partition_constructor ( IO_INTERFACE* disc, u32 cacheSize PARTITION* partition; int i; u32 bootSector; - u8 sectorBuffer[BYTES_PER_READ]; + u8 sectorBuffer[BYTES_PER_READ] = {0}; // Read first sector of disc if ( !_FAT_disc_readSectors (disc, 0, 1, sectorBuffer)) { @@ -156,7 +156,7 @@ static PARTITION* _FAT_partition_constructor ( IO_INTERFACE* disc, u32 cacheSize partition = (PARTITION*) _FAT_mem_allocate (sizeof(PARTITION)); if (partition == NULL) { - return false; + return NULL; } // Set partition's disc interface