source: trunk/softs/tsar_boot/include/sdcard.h @ 663

Last change on this file since 663 was 501, checked in by bouyer, 11 years ago

Add support for >= v2, SDHC cards (larger than 2GB).
Tested with a 512MB < v2 and a 4GB cards.

File size: 5.0 KB
Line 
1/**
2 * \file sdcard.h
3 * \date 30 August 2012
4 * \author Cesar fuguet <cesar.fuguet-tortolero@lip6.fr>
5 *
6 * This file defines the driver of a SD Card device using an SPI controller
7 */
8
9#ifndef SDCARD_H
10#define SDCARD_H
11
12#include <spi.h>
13
14/**
15 * \brief SD Card type definition
16 */
17struct sdcard_dev
18{ 
19    /**
20     * SPI controller pointer
21     */
22    struct spi_dev * spi;
23
24    /**
25     * Block length of the SDCARD
26     */
27    unsigned int block_length;
28
29    /**
30     * Access pointer representing the offset in bytes used
31     * to read or write in the SDCARD.
32     *
33     * \note this driver is for cards SDSD, therefore this offset
34     *       must be multiple of the block length
35     */ 
36    unsigned int access_pointer;
37
38    /**
39     * Slave ID. This ID represents the number of the slave select signal
40     * used in the hardware platform
41     */
42    int    slave_id;
43
44    /* is the card high capacity ? */
45    int sdhc;
46};
47
48/**
49 * \param   sdcard  : uninitialized pointer. This parameter will contain
50 *                    a pointer to the initialized block device or NULL otherwise
51 * \param   spi     : initialized pointer to the spi controller
52 * \param   ss      : slave select signal number
53 *
54 * \return  0 when initialization succeeds or an error code value otherwise.
55 *          The error codes are defined in this header file.
56 *
57 * \brief   Initialize the block device
58 */
59int sdcard_dev_open(struct sdcard_dev * sdcard, struct spi_dev * spi, int ss);
60
61/**
62 * \param   sdcard  : Pointer to the initialized block device
63 * \param   buf     : Pointer to a memory segment wherein store
64 * \param   count   : number of bytes to read
65 *
66 * \return  0 when read succeeds or an error code value otherwise.
67 *          The error codes are defined in this header file.
68 *
69 * \brief   Read in the block device
70 *
71 * The read is made in the current block device access pointer.
72 * In the read succeeds, the block device access pointer is
73 * relocated to the next block.
74 */
75int sdcard_dev_read(struct sdcard_dev * sdcard, void * buf, unsigned int count);
76
77/**
78 * \param   sdcard  : Pointer to the initialized block device
79 * \param   buf     : Pointer to a memory segment wherein the
80 * \param   count   : number of blocks to write
81 *
82 * \return  0 when write succeeds or an error code value otherwise.
83 *          The error codes are defined in this header file.
84 *
85 * \brief   Write in the block device
86 *
87 * The write is made in the current block device access pointer.
88 * In the write succeeds, the block device access pointer is
89 * relocated to the next block.
90 */
91unsigned int sdcard_dev_write(struct sdcard_dev * sdcard, void * buf, unsigned int count);
92
93/**
94 * \param   sdcard  : Pointer to the initialized block device
95 * \param   pos     : Position where the block device access
96 *                    pointer must be move
97 *
98 * \return  void
99 *
100 * \brief   Change block device access pointer position
101 * 
102 * The block device access pointer is relocated in terms of blocks
103 */
104void sdcard_dev_lseek(struct sdcard_dev * sdcard, unsigned int pos);
105
106/**
107 * \param   sdcard  : Pointer to the initialized block device
108 * \param   len     : Block device length to set
109 *
110 * \return  0 when succeed or error code value otherwise
111 *
112 * \brief   Set the block length of the device
113 */
114int sdcard_dev_set_blocklen(struct sdcard_dev * sdcard, unsigned int len);
115
116/**
117 * SD Card constants
118 */
119
120/** Number of retries after an unacknowledge command */
121#define SDCARD_COMMAND_TIMEOUT      100
122
123/** This command is a simple SD commmand */
124#define SDCARD_CMD                  0
125
126/** This is an application specific command */
127#define SDCARD_ACMD                 1
128
129/** The transmition is done in the negative edge of the clock */
130#define SDCARD_TX_NEGEDGE           0
131
132/** The transmition is done in the positive edge of the clock */
133#define SDCARD_TX_POSEDGE           1
134
135/** The reception is done in the negative edge of the clock */
136#define SDCARD_RX_NEGEDGE           0
137
138/** The reception is done in the positive edge of the clock */
139#define SDCARD_RX_POSEDGE           1
140
141/**
142 * SD Card macros
143 */
144
145/** Check if the response is valid */
146#define SDCARD_CHECK_R1_VALID(x)    (~x & SDCARD_R1_RSP_VALID) ? 1 : 0
147
148/**
149 * Check if there is an error in the response
150 *
151 * \note this macro must be used after verify that the response is
152 *       valid
153 */
154#define SDCARD_CHECK_R1_ERROR(x)    ( x & 0x7E)                ? 1 : 0
155
156/**
157 * SD Card Response 1 (R1) format constants
158 */
159#define SDCARD_R1_IN_IDLE_STATE     ( 1 << 0 ) /**< \brief R1 bit 0 */
160#define SDCARD_R1_ERASE_RESET       ( 1 << 1 ) /**< \brief R1 bit 1 */
161#define SDCARD_R1_ILLEGAL_CMD       ( 1 << 2 ) /**< \brief R1 bit 2 */
162#define SDCARD_R1_COM_CRC_ERR       ( 1 << 3 ) /**< \brief R1 bit 3 */
163#define SDCARD_R1_ERASE_SEQ_ERR     ( 1 << 4 ) /**< \brief R1 bit 4 */
164#define SDCARD_R1_ADDRESS_ERR       ( 1 << 5 ) /**< \brief R1 bit 5 */
165#define SDCARD_R1_PARAMETER_ERR     ( 1 << 6 ) /**< \brief R1 bit 6 */
166#define SDCARD_R1_RSP_VALID         ( 1 << 7 ) /**< \brief R1 bit 7 */
167
168#endif
169
170/*
171 * vim: tabstop=4 : shiftwidth=4 : expandtab : softtabstop=4
172 */
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