pihelp: sd_raw.c comparison

comparison sd_raw.c @ 30:320c8cc7df5a

merge

author	Matt Johnston <matt@ucc.asn.au>
date	Thu, 27 Jun 2013 00:12:01 +0800
parents	5f9a40d6991b
children	9e888708f33d

comparison

equal deleted inserted replaced

-:22badb6239e0
+:320c8cc7df5a
+/*
+* Copyright (c) 2006-2012 by Roland Riegel <[email protected]>
+*
+* 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
+uint8_t csd_structure = 0;
+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 == 0)
+{
+csd_structure = b >> 6;
+}
+else 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(csd_structure == 0x01)
+{
+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 if(csd_structure == 0x00)
+#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;
+}

Mercurial > pihelp

comparison sd_raw.c @ 30:320c8cc7df5a