/firmware/src/Motherboard/lib_sd/sd_raw.c
http://github.com/makerbot/G3Firmware · C · 994 lines · 613 code · 113 blank · 268 comment · 123 complexity · 9e49e700d36a684db7e72d25c1e0f3c3 MD5 · raw file
- /*
- * Copyright (c) 2006-2010 by Roland Riegel <feedback@roland-riegel.de>
- *
- * This file is free software; you can redistribute it and/or modify
- * it under the terms of either the GNU General Public License version 2
- * or the GNU Lesser General Public License version 2.1, both as
- * published by the Free Software Foundation.
- */
- #include <string.h>
- #include <avr/io.h>
- #include "sd_raw.h"
- /**
- * \addtogroup sd_raw MMC/SD/SDHC card raw access
- *
- * This module implements read and write access to MMC, SD
- * and SDHC cards. It serves as a low-level driver for the
- * higher level modules such as partition and file system
- * access.
- *
- * @{
- */
- /**
- * \file
- * MMC/SD/SDHC raw access implementation (license: GPLv2 or LGPLv2.1)
- *
- * \author Roland Riegel
- */
- /**
- * \addtogroup sd_raw_config MMC/SD configuration
- * Preprocessor defines to configure the MMC/SD support.
- */
- /**
- * @}
- */
- /* commands available in SPI mode */
- /* CMD0: response R1 */
- #define CMD_GO_IDLE_STATE 0x00
- /* CMD1: response R1 */
- #define CMD_SEND_OP_COND 0x01
- /* CMD8: response R7 */
- #define CMD_SEND_IF_COND 0x08
- /* CMD9: response R1 */
- #define CMD_SEND_CSD 0x09
- /* CMD10: response R1 */
- #define CMD_SEND_CID 0x0a
- /* CMD12: response R1 */
- #define CMD_STOP_TRANSMISSION 0x0c
- /* CMD13: response R2 */
- #define CMD_SEND_STATUS 0x0d
- /* CMD16: arg0[31:0]: block length, response R1 */
- #define CMD_SET_BLOCKLEN 0x10
- /* CMD17: arg0[31:0]: data address, response R1 */
- #define CMD_READ_SINGLE_BLOCK 0x11
- /* CMD18: arg0[31:0]: data address, response R1 */
- #define CMD_READ_MULTIPLE_BLOCK 0x12
- /* CMD24: arg0[31:0]: data address, response R1 */
- #define CMD_WRITE_SINGLE_BLOCK 0x18
- /* CMD25: arg0[31:0]: data address, response R1 */
- #define CMD_WRITE_MULTIPLE_BLOCK 0x19
- /* CMD27: response R1 */
- #define CMD_PROGRAM_CSD 0x1b
- /* CMD28: arg0[31:0]: data address, response R1b */
- #define CMD_SET_WRITE_PROT 0x1c
- /* CMD29: arg0[31:0]: data address, response R1b */
- #define CMD_CLR_WRITE_PROT 0x1d
- /* CMD30: arg0[31:0]: write protect data address, response R1 */
- #define CMD_SEND_WRITE_PROT 0x1e
- /* CMD32: arg0[31:0]: data address, response R1 */
- #define CMD_TAG_SECTOR_START 0x20
- /* CMD33: arg0[31:0]: data address, response R1 */
- #define CMD_TAG_SECTOR_END 0x21
- /* CMD34: arg0[31:0]: data address, response R1 */
- #define CMD_UNTAG_SECTOR 0x22
- /* CMD35: arg0[31:0]: data address, response R1 */
- #define CMD_TAG_ERASE_GROUP_START 0x23
- /* CMD36: arg0[31:0]: data address, response R1 */
- #define CMD_TAG_ERASE_GROUP_END 0x24
- /* CMD37: arg0[31:0]: data address, response R1 */
- #define CMD_UNTAG_ERASE_GROUP 0x25
- /* CMD38: arg0[31:0]: stuff bits, response R1b */
- #define CMD_ERASE 0x26
- /* ACMD41: arg0[31:0]: OCR contents, response R1 */
- #define CMD_SD_SEND_OP_COND 0x29
- /* CMD42: arg0[31:0]: stuff bits, response R1b */
- #define CMD_LOCK_UNLOCK 0x2a
- /* CMD55: arg0[31:0]: stuff bits, response R1 */
- #define CMD_APP 0x37
- /* CMD58: arg0[31:0]: stuff bits, response R3 */
- #define CMD_READ_OCR 0x3a
- /* CMD59: arg0[31:1]: stuff bits, arg0[0:0]: crc option, response R1 */
- #define CMD_CRC_ON_OFF 0x3b
- /* command responses */
- /* R1: size 1 byte */
- #define R1_IDLE_STATE 0
- #define R1_ERASE_RESET 1
- #define R1_ILL_COMMAND 2
- #define R1_COM_CRC_ERR 3
- #define R1_ERASE_SEQ_ERR 4
- #define R1_ADDR_ERR 5
- #define R1_PARAM_ERR 6
- /* R1b: equals R1, additional busy bytes */
- /* R2: size 2 bytes */
- #define R2_CARD_LOCKED 0
- #define R2_WP_ERASE_SKIP 1
- #define R2_ERR 2
- #define R2_CARD_ERR 3
- #define R2_CARD_ECC_FAIL 4
- #define R2_WP_VIOLATION 5
- #define R2_INVAL_ERASE 6
- #define R2_OUT_OF_RANGE 7
- #define R2_CSD_OVERWRITE 7
- #define R2_IDLE_STATE (R1_IDLE_STATE + 8)
- #define R2_ERASE_RESET (R1_ERASE_RESET + 8)
- #define R2_ILL_COMMAND (R1_ILL_COMMAND + 8)
- #define R2_COM_CRC_ERR (R1_COM_CRC_ERR + 8)
- #define R2_ERASE_SEQ_ERR (R1_ERASE_SEQ_ERR + 8)
- #define R2_ADDR_ERR (R1_ADDR_ERR + 8)
- #define R2_PARAM_ERR (R1_PARAM_ERR + 8)
- /* R3: size 5 bytes */
- #define R3_OCR_MASK (0xffffffffUL)
- #define R3_IDLE_STATE (R1_IDLE_STATE + 32)
- #define R3_ERASE_RESET (R1_ERASE_RESET + 32)
- #define R3_ILL_COMMAND (R1_ILL_COMMAND + 32)
- #define R3_COM_CRC_ERR (R1_COM_CRC_ERR + 32)
- #define R3_ERASE_SEQ_ERR (R1_ERASE_SEQ_ERR + 32)
- #define R3_ADDR_ERR (R1_ADDR_ERR + 32)
- #define R3_PARAM_ERR (R1_PARAM_ERR + 32)
- /* Data Response: size 1 byte */
- #define DR_STATUS_MASK 0x0e
- #define DR_STATUS_ACCEPTED 0x05
- #define DR_STATUS_CRC_ERR 0x0a
- #define DR_STATUS_WRITE_ERR 0x0c
- /* status bits for card types */
- #define SD_RAW_SPEC_1 0
- #define SD_RAW_SPEC_2 1
- #define SD_RAW_SPEC_SDHC 2
- #if !SD_RAW_SAVE_RAM
- /* static data buffer for acceleration */
- static uint8_t raw_block[512];
- /* offset where the data within raw_block lies on the card */
- static offset_t raw_block_address;
- #if SD_RAW_WRITE_BUFFERING
- /* flag to remember if raw_block was written to the card */
- static uint8_t raw_block_written;
- #endif
- #endif
- /* card type state */
- static uint8_t sd_raw_card_type;
- /* private helper functions */
- static void sd_raw_send_byte(uint8_t b);
- static uint8_t sd_raw_rec_byte();
- static uint8_t sd_raw_send_command(uint8_t command, uint32_t arg);
- /**
- * \ingroup sd_raw
- * Initializes memory card communication.
- *
- * \returns 0 on failure, 1 on success.
- */
- uint8_t sd_raw_init()
- {
- /* enable inputs for reading card status */
- configure_pin_available();
- configure_pin_locked();
- /* enable outputs for MOSI, SCK, SS, input for MISO */
- configure_pin_mosi();
- configure_pin_sck();
- configure_pin_ss();
- configure_pin_miso();
- unselect_card();
- /* initialize SPI with lowest frequency; max. 400kHz during identification mode of card */
- SPCR = (0 << SPIE) | /* SPI Interrupt Enable */
- (1 << SPE) | /* SPI Enable */
- (0 << DORD) | /* Data Order: MSB first */
- (1 << MSTR) | /* Master mode */
- (0 << CPOL) | /* Clock Polarity: SCK low when idle */
- (0 << CPHA) | /* Clock Phase: sample on rising SCK edge */
- (1 << SPR1) | /* Clock Frequency: f_OSC / 128 */
- (1 << SPR0);
- SPSR &= ~(1 << SPI2X); /* No doubled clock frequency */
- /* initialization procedure */
- sd_raw_card_type = 0;
-
- if(!sd_raw_available())
- return 0;
- /* card needs 74 cycles minimum to start up */
- for(uint8_t i = 0; i < 10; ++i)
- {
- /* wait 8 clock cycles */
- sd_raw_rec_byte();
- }
- /* address card */
- select_card();
- /* reset card */
- uint8_t response;
- for(uint16_t i = 0; ; ++i)
- {
- response = sd_raw_send_command(CMD_GO_IDLE_STATE, 0);
- if(response == (1 << R1_IDLE_STATE))
- break;
- if(i == 0x1ff)
- {
- unselect_card();
- return 0;
- }
- }
- #if SD_RAW_SDHC
- /* check for version of SD card specification */
- response = sd_raw_send_command(CMD_SEND_IF_COND, 0x100 /* 2.7V - 3.6V */ | 0xaa /* test pattern */);
- if((response & (1 << R1_ILL_COMMAND)) == 0)
- {
- sd_raw_rec_byte();
- sd_raw_rec_byte();
- if((sd_raw_rec_byte() & 0x01) == 0)
- return 0; /* card operation voltage range doesn't match */
- if(sd_raw_rec_byte() != 0xaa)
- return 0; /* wrong test pattern */
- /* card conforms to SD 2 card specification */
- sd_raw_card_type |= (1 << SD_RAW_SPEC_2);
- }
- else
- #endif
- {
- /* determine SD/MMC card type */
- sd_raw_send_command(CMD_APP, 0);
- response = sd_raw_send_command(CMD_SD_SEND_OP_COND, 0);
- if((response & (1 << R1_ILL_COMMAND)) == 0)
- {
- /* card conforms to SD 1 card specification */
- sd_raw_card_type |= (1 << SD_RAW_SPEC_1);
- }
- else
- {
- /* MMC card */
- }
- }
- /* wait for card to get ready */
- for(uint16_t i = 0; ; ++i)
- {
- if(sd_raw_card_type & ((1 << SD_RAW_SPEC_1) | (1 << SD_RAW_SPEC_2)))
- {
- uint32_t arg = 0;
- #if SD_RAW_SDHC
- if(sd_raw_card_type & (1 << SD_RAW_SPEC_2))
- arg = 0x40000000;
- #endif
- sd_raw_send_command(CMD_APP, 0);
- response = sd_raw_send_command(CMD_SD_SEND_OP_COND, arg);
- }
- else
- {
- response = sd_raw_send_command(CMD_SEND_OP_COND, 0);
- }
- if((response & (1 << R1_IDLE_STATE)) == 0)
- break;
- if(i == 0x7fff)
- {
- unselect_card();
- return 0;
- }
- }
- #if SD_RAW_SDHC
- if(sd_raw_card_type & (1 << SD_RAW_SPEC_2))
- {
- if(sd_raw_send_command(CMD_READ_OCR, 0))
- {
- unselect_card();
- return 0;
- }
- if(sd_raw_rec_byte() & 0x40)
- sd_raw_card_type |= (1 << SD_RAW_SPEC_SDHC);
- sd_raw_rec_byte();
- sd_raw_rec_byte();
- sd_raw_rec_byte();
- }
- #endif
- /* set block size to 512 bytes */
- if(sd_raw_send_command(CMD_SET_BLOCKLEN, 512))
- {
- unselect_card();
- return 0;
- }
- /* deaddress card */
- unselect_card();
- /* switch to highest SPI frequency possible */
- SPCR &= ~((1 << SPR1) | (1 << SPR0)); /* Clock Frequency: f_OSC / 4 */
- SPSR |= (1 << SPI2X); /* Doubled Clock Frequency: f_OSC / 2 */
- #if !SD_RAW_SAVE_RAM
- /* the first block is likely to be accessed first, so precache it here */
- raw_block_address = (offset_t) -1;
- #if SD_RAW_WRITE_BUFFERING
- raw_block_written = 1;
- #endif
- if(!sd_raw_read(0, raw_block, sizeof(raw_block)))
- return 0;
- #endif
- return 1;
- }
- /**
- * \ingroup sd_raw
- * Checks wether a memory card is located in the slot.
- *
- * \returns 1 if the card is available, 0 if it is not.
- */
- uint8_t sd_raw_available()
- {
- return get_pin_available() == 0x00;
- }
- /**
- * \ingroup sd_raw
- * Checks wether the memory card is locked for write access.
- *
- * \returns 1 if the card is locked, 0 if it is not.
- */
- uint8_t sd_raw_locked()
- {
- return get_pin_locked() == 0x00;
- }
- /**
- * \ingroup sd_raw
- * Sends a raw byte to the memory card.
- *
- * \param[in] b The byte to sent.
- * \see sd_raw_rec_byte
- */
- void sd_raw_send_byte(uint8_t b)
- {
- SPDR = b;
- /* wait for byte to be shifted out */
- while(!(SPSR & (1 << SPIF)));
- SPSR &= ~(1 << SPIF);
- }
- /**
- * \ingroup sd_raw
- * Receives a raw byte from the memory card.
- *
- * \returns The byte which should be read.
- * \see sd_raw_send_byte
- */
- uint8_t sd_raw_rec_byte()
- {
- /* send dummy data for receiving some */
- SPDR = 0xff;
- while(!(SPSR & (1 << SPIF)));
- SPSR &= ~(1 << SPIF);
- return SPDR;
- }
- /**
- * \ingroup sd_raw
- * Send a command to the memory card which responses with a R1 response (and possibly others).
- *
- * \param[in] command The command to send.
- * \param[in] arg The argument for command.
- * \returns The command answer.
- */
- uint8_t sd_raw_send_command(uint8_t command, uint32_t arg)
- {
- uint8_t response;
- /* wait some clock cycles */
- sd_raw_rec_byte();
- /* send command via SPI */
- sd_raw_send_byte(0x40 | command);
- sd_raw_send_byte((arg >> 24) & 0xff);
- sd_raw_send_byte((arg >> 16) & 0xff);
- sd_raw_send_byte((arg >> 8) & 0xff);
- sd_raw_send_byte((arg >> 0) & 0xff);
- switch(command)
- {
- case CMD_GO_IDLE_STATE:
- sd_raw_send_byte(0x95);
- break;
- case CMD_SEND_IF_COND:
- sd_raw_send_byte(0x87);
- break;
- default:
- sd_raw_send_byte(0xff);
- break;
- }
-
- /* receive response */
- for(uint8_t i = 0; i < 10; ++i)
- {
- response = sd_raw_rec_byte();
- if(response != 0xff)
- break;
- }
- return response;
- }
- /**
- * \ingroup sd_raw
- * Reads raw data from the card.
- *
- * \param[in] offset The offset from which to read.
- * \param[out] buffer The buffer into which to write the data.
- * \param[in] length The number of bytes to read.
- * \returns 0 on failure, 1 on success.
- * \see sd_raw_read_interval, sd_raw_write, sd_raw_write_interval
- */
- uint8_t sd_raw_read(offset_t offset, uint8_t* buffer, uintptr_t length)
- {
- offset_t block_address;
- uint16_t block_offset;
- uint16_t read_length;
- while(length > 0)
- {
- /* determine byte count to read at once */
- block_offset = offset & 0x01ff;
- block_address = offset - block_offset;
- read_length = 512 - block_offset; /* read up to block border */
- if(read_length > length)
- read_length = length;
-
- #if !SD_RAW_SAVE_RAM
- /* check if the requested data is cached */
- if(block_address != raw_block_address)
- #endif
- {
- #if SD_RAW_WRITE_BUFFERING
- if(!sd_raw_sync())
- return 0;
- #endif
- /* address card */
- select_card();
- /* send single block request */
- #if SD_RAW_SDHC
- if(sd_raw_send_command(CMD_READ_SINGLE_BLOCK, (sd_raw_card_type & (1 << SD_RAW_SPEC_SDHC) ? block_address / 512 : block_address)))
- #else
- if(sd_raw_send_command(CMD_READ_SINGLE_BLOCK, block_address))
- #endif
- {
- unselect_card();
- return 0;
- }
- /* wait for data block (start byte 0xfe) */
- while(sd_raw_rec_byte() != 0xfe);
- #if SD_RAW_SAVE_RAM
- /* read byte block */
- uint16_t read_to = block_offset + read_length;
- for(uint16_t i = 0; i < 512; ++i)
- {
- uint8_t b = sd_raw_rec_byte();
- if(i >= block_offset && i < read_to)
- *buffer++ = b;
- }
- #else
- /* read byte block */
- uint8_t* cache = raw_block;
- for(uint16_t i = 0; i < 512; ++i)
- *cache++ = sd_raw_rec_byte();
- raw_block_address = block_address;
- memcpy(buffer, raw_block + block_offset, read_length);
- buffer += read_length;
- #endif
-
- /* read crc16 */
- sd_raw_rec_byte();
- sd_raw_rec_byte();
-
- /* deaddress card */
- unselect_card();
- /* let card some time to finish */
- sd_raw_rec_byte();
- }
- #if !SD_RAW_SAVE_RAM
- else
- {
- /* use cached data */
- memcpy(buffer, raw_block + block_offset, read_length);
- buffer += read_length;
- }
- #endif
- length -= read_length;
- offset += read_length;
- }
- return 1;
- }
- /**
- * \ingroup sd_raw
- * Continuously reads units of \c interval bytes and calls a callback function.
- *
- * This function starts reading at the specified offset. Every \c interval bytes,
- * it calls the callback function with the associated data buffer.
- *
- * By returning zero, the callback may stop reading.
- *
- * \note Within the callback function, you can not start another read or
- * write operation.
- * \note This function only works if the following conditions are met:
- * - (offset - (offset % 512)) % interval == 0
- * - length % interval == 0
- *
- * \param[in] offset Offset from which to start reading.
- * \param[in] buffer Pointer to a buffer which is at least interval bytes in size.
- * \param[in] interval Number of bytes to read before calling the callback function.
- * \param[in] length Number of bytes to read altogether.
- * \param[in] callback The function to call every interval bytes.
- * \param[in] p An opaque pointer directly passed to the callback function.
- * \returns 0 on failure, 1 on success
- * \see sd_raw_write_interval, sd_raw_read, sd_raw_write
- */
- uint8_t sd_raw_read_interval(offset_t offset, uint8_t* buffer, uintptr_t interval, uintptr_t length, sd_raw_read_interval_handler_t callback, void* p)
- {
- if(!buffer || interval == 0 || length < interval || !callback)
- return 0;
- #if !SD_RAW_SAVE_RAM
- while(length >= interval)
- {
- /* as reading is now buffered, we directly
- * hand over the request to sd_raw_read()
- */
- if(!sd_raw_read(offset, buffer, interval))
- return 0;
- if(!callback(buffer, offset, p))
- break;
- offset += interval;
- length -= interval;
- }
- return 1;
- #else
- /* address card */
- select_card();
- uint16_t block_offset;
- uint16_t read_length;
- uint8_t* buffer_cur;
- uint8_t finished = 0;
- do
- {
- /* determine byte count to read at once */
- block_offset = offset & 0x01ff;
- read_length = 512 - block_offset;
-
- /* send single block request */
- #if SD_RAW_SDHC
- if(sd_raw_send_command(CMD_READ_SINGLE_BLOCK, (sd_raw_card_type & (1 << SD_RAW_SPEC_SDHC) ? offset / 512 : offset - block_offset)))
- #else
- if(sd_raw_send_command(CMD_READ_SINGLE_BLOCK, offset - block_offset))
- #endif
- {
- unselect_card();
- return 0;
- }
- /* wait for data block (start byte 0xfe) */
- while(sd_raw_rec_byte() != 0xfe);
- /* read up to the data of interest */
- for(uint16_t i = 0; i < block_offset; ++i)
- sd_raw_rec_byte();
- /* read interval bytes of data and execute the callback */
- do
- {
- if(read_length < interval || length < interval)
- break;
- buffer_cur = buffer;
- for(uint16_t i = 0; i < interval; ++i)
- *buffer_cur++ = sd_raw_rec_byte();
- if(!callback(buffer, offset + (512 - read_length), p))
- {
- finished = 1;
- break;
- }
- read_length -= interval;
- length -= interval;
- } while(read_length > 0 && length > 0);
-
- /* read rest of data block */
- while(read_length-- > 0)
- sd_raw_rec_byte();
-
- /* read crc16 */
- sd_raw_rec_byte();
- sd_raw_rec_byte();
- if(length < interval)
- break;
- offset = offset - block_offset + 512;
- } while(!finished);
-
- /* deaddress card */
- unselect_card();
- /* let card some time to finish */
- sd_raw_rec_byte();
- return 1;
- #endif
- }
- #if DOXYGEN || SD_RAW_WRITE_SUPPORT
- /**
- * \ingroup sd_raw
- * Writes raw data to the card.
- *
- * \note If write buffering is enabled, you might have to
- * call sd_raw_sync() before disconnecting the card
- * to ensure all remaining data has been written.
- *
- * \param[in] offset The offset where to start writing.
- * \param[in] buffer The buffer containing the data to be written.
- * \param[in] length The number of bytes to write.
- * \returns 0 on failure, 1 on success.
- * \see sd_raw_write_interval, sd_raw_read, sd_raw_read_interval
- */
- uint8_t sd_raw_write(offset_t offset, const uint8_t* buffer, uintptr_t length)
- {
- if(sd_raw_locked())
- return 0;
- offset_t block_address;
- uint16_t block_offset;
- uint16_t write_length;
- while(length > 0)
- {
- /* determine byte count to write at once */
- block_offset = offset & 0x01ff;
- block_address = offset - block_offset;
- write_length = 512 - block_offset; /* write up to block border */
- if(write_length > length)
- write_length = length;
-
- /* Merge the data to write with the content of the block.
- * Use the cached block if available.
- */
- if(block_address != raw_block_address)
- {
- #if SD_RAW_WRITE_BUFFERING
- if(!sd_raw_sync())
- return 0;
- #endif
- if(block_offset || write_length < 512)
- {
- if(!sd_raw_read(block_address, raw_block, sizeof(raw_block)))
- return 0;
- }
- raw_block_address = block_address;
- }
- if(buffer != raw_block)
- {
- memcpy(raw_block + block_offset, buffer, write_length);
- #if SD_RAW_WRITE_BUFFERING
- raw_block_written = 0;
- if(length == write_length)
- return 1;
- #endif
- }
- /* address card */
- select_card();
- /* send single block request */
- #if SD_RAW_SDHC
- if(sd_raw_send_command(CMD_WRITE_SINGLE_BLOCK, (sd_raw_card_type & (1 << SD_RAW_SPEC_SDHC) ? block_address / 512 : block_address)))
- #else
- if(sd_raw_send_command(CMD_WRITE_SINGLE_BLOCK, block_address))
- #endif
- {
- unselect_card();
- return 0;
- }
- /* send start byte */
- sd_raw_send_byte(0xfe);
- /* write byte block */
- uint8_t* cache = raw_block;
- for(uint16_t i = 0; i < 512; ++i)
- sd_raw_send_byte(*cache++);
- /* write dummy crc16 */
- sd_raw_send_byte(0xff);
- sd_raw_send_byte(0xff);
- /* wait while card is busy */
- while(sd_raw_rec_byte() != 0xff);
- sd_raw_rec_byte();
- /* deaddress card */
- unselect_card();
- buffer += write_length;
- offset += write_length;
- length -= write_length;
- #if SD_RAW_WRITE_BUFFERING
- raw_block_written = 1;
- #endif
- }
- return 1;
- }
- #endif
- #if DOXYGEN || SD_RAW_WRITE_SUPPORT
- /**
- * \ingroup sd_raw
- * Writes a continuous data stream obtained from a callback function.
- *
- * This function starts writing at the specified offset. To obtain the
- * next bytes to write, it calls the callback function. The callback fills the
- * provided data buffer and returns the number of bytes it has put into the buffer.
- *
- * By returning zero, the callback may stop writing.
- *
- * \param[in] offset Offset where to start writing.
- * \param[in] buffer Pointer to a buffer which is used for the callback function.
- * \param[in] length Number of bytes to write in total. May be zero for endless writes.
- * \param[in] callback The function used to obtain the bytes to write.
- * \param[in] p An opaque pointer directly passed to the callback function.
- * \returns 0 on failure, 1 on success
- * \see sd_raw_read_interval, sd_raw_write, sd_raw_read
- */
- uint8_t sd_raw_write_interval(offset_t offset, uint8_t* buffer, uintptr_t length, sd_raw_write_interval_handler_t callback, void* p)
- {
- #if SD_RAW_SAVE_RAM
- #error "SD_RAW_WRITE_SUPPORT is not supported together with SD_RAW_SAVE_RAM"
- #endif
- if(!buffer || !callback)
- return 0;
- uint8_t endless = (length == 0);
- while(endless || length > 0)
- {
- uint16_t bytes_to_write = callback(buffer, offset, p);
- if(!bytes_to_write)
- break;
- if(!endless && bytes_to_write > length)
- return 0;
- /* as writing is always buffered, we directly
- * hand over the request to sd_raw_write()
- */
- if(!sd_raw_write(offset, buffer, bytes_to_write))
- return 0;
- offset += bytes_to_write;
- length -= bytes_to_write;
- }
- return 1;
- }
- #endif
- #if DOXYGEN || SD_RAW_WRITE_SUPPORT
- /**
- * \ingroup sd_raw
- * Writes the write buffer's content to the card.
- *
- * \note When write buffering is enabled, you should
- * call this function before disconnecting the
- * card to ensure all remaining data has been
- * written.
- *
- * \returns 0 on failure, 1 on success.
- * \see sd_raw_write
- */
- uint8_t sd_raw_sync()
- {
- #if SD_RAW_WRITE_BUFFERING
- if(raw_block_written)
- return 1;
- if(!sd_raw_write(raw_block_address, raw_block, sizeof(raw_block)))
- return 0;
- raw_block_written = 1;
- #endif
- return 1;
- }
- #endif
- /**
- * \ingroup sd_raw
- * Reads informational data from the card.
- *
- * This function reads and returns the card's registers
- * containing manufacturing and status information.
- *
- * \note: The information retrieved by this function is
- * not required in any way to operate on the card,
- * but it might be nice to display some of the data
- * to the user.
- *
- * \param[in] info A pointer to the structure into which to save the information.
- * \returns 0 on failure, 1 on success.
- */
- uint8_t sd_raw_get_info(struct sd_raw_info* info)
- {
- if(!info || !sd_raw_available())
- return 0;
- memset(info, 0, sizeof(*info));
- select_card();
- /* read cid register */
- if(sd_raw_send_command(CMD_SEND_CID, 0))
- {
- unselect_card();
- return 0;
- }
- while(sd_raw_rec_byte() != 0xfe);
- for(uint8_t i = 0; i < 18; ++i)
- {
- uint8_t b = sd_raw_rec_byte();
- switch(i)
- {
- case 0:
- info->manufacturer = b;
- break;
- case 1:
- case 2:
- info->oem[i - 1] = b;
- break;
- case 3:
- case 4:
- case 5:
- case 6:
- case 7:
- info->product[i - 3] = b;
- break;
- case 8:
- info->revision = b;
- break;
- case 9:
- case 10:
- case 11:
- case 12:
- info->serial |= (uint32_t) b << ((12 - i) * 8);
- break;
- case 13:
- info->manufacturing_year = b << 4;
- break;
- case 14:
- info->manufacturing_year |= b >> 4;
- info->manufacturing_month = b & 0x0f;
- break;
- }
- }
- /* read csd register */
- uint8_t csd_read_bl_len = 0;
- uint8_t csd_c_size_mult = 0;
- #if SD_RAW_SDHC
- uint16_t csd_c_size = 0;
- #else
- uint32_t csd_c_size = 0;
- #endif
- if(sd_raw_send_command(CMD_SEND_CSD, 0))
- {
- unselect_card();
- return 0;
- }
- while(sd_raw_rec_byte() != 0xfe);
- for(uint8_t i = 0; i < 18; ++i)
- {
- uint8_t b = sd_raw_rec_byte();
- if(i == 14)
- {
- if(b & 0x40)
- info->flag_copy = 1;
- if(b & 0x20)
- info->flag_write_protect = 1;
- if(b & 0x10)
- info->flag_write_protect_temp = 1;
- info->format = (b & 0x0c) >> 2;
- }
- else
- {
- #if SD_RAW_SDHC
- if(sd_raw_card_type & (1 << SD_RAW_SPEC_2))
- {
- switch(i)
- {
- case 7:
- b &= 0x3f;
- case 8:
- case 9:
- csd_c_size <<= 8;
- csd_c_size |= b;
- break;
- }
- if(i == 9)
- {
- ++csd_c_size;
- info->capacity = (offset_t) csd_c_size * 512 * 1024;
- }
- }
- else
- #endif
- {
- switch(i)
- {
- case 5:
- csd_read_bl_len = b & 0x0f;
- break;
- case 6:
- csd_c_size = b & 0x03;
- csd_c_size <<= 8;
- break;
- case 7:
- csd_c_size |= b;
- csd_c_size <<= 2;
- break;
- case 8:
- csd_c_size |= b >> 6;
- ++csd_c_size;
- break;
- case 9:
- csd_c_size_mult = b & 0x03;
- csd_c_size_mult <<= 1;
- break;
- case 10:
- csd_c_size_mult |= b >> 7;
- info->capacity = (uint32_t) csd_c_size << (csd_c_size_mult + csd_read_bl_len + 2);
- break;
- }
- }
- }
- }
- unselect_card();
- return 1;
- }