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rfat_disk.c
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/*
* Copyright (c) 2014 Thomas Roell. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal with the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimers.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimers in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Thomas Roell, nor the names of its contributors
* may be used to endorse or promote products derived from this Software
* without specific prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* WITH THE SOFTWARE.
*/
#include "rfat_disk.h"
#include "rfat_port.h"
static rfat_disk_t rfat_disk;
#if (RFAT_CONFIG_DISK_SIMULATE == 0)
#define FALSE 0
#define TRUE 1
#if !defined(NULL)
#define NULL ((void*)0)
#endif
static int rfat_disk_send_command(rfat_disk_t *disk, uint8_t index, const uint32_t argument, uint32_t count);
static int rfat_disk_send_data(rfat_disk_t *disk, uint8_t token, const uint8_t *data, uint32_t count, unsigned int *p_retries);
static int rfat_disk_receive_data(rfat_disk_t *disk, uint8_t *data, uint32_t count, unsigned int *p_retries);
static int rfat_disk_reset(rfat_disk_t *disk);
static int rfat_disk_lock(rfat_disk_t *disk, int state, uint32_t address);
static int rfat_disk_unlock(rfat_disk_t *disk, int status);
#define SD_CMD_GO_IDLE_STATE (0)
#define SD_CMD_SEND_OP_COND (1)
#define SD_CMD_SEND_IF_COND (8)
#define SD_CMD_SEND_CSD (9)
#define SD_CMD_SEND_CID (10)
#define SD_CMD_STOP_TRANSMISSION (12)
#define SD_CMD_SEND_STATUS (13)
#define SD_CMD_SET_BLOCKLEN (16)
#define SD_CMD_READ_SINGLE_BLOCK (17)
#define SD_CMD_READ_MULTIPLE_BLOCK (18)
#define SD_CMD_WRITE_SINGLE_BLOCK (24)
#define SD_CMD_WRITE_MULTIPLE_BLOCK (25)
#define SD_CMD_PROGRAM_CSD (27)
#define SD_CMD_ERASE_WR_BLK_START_ADDR (32)
#define SD_CMD_ERASE_WR_BLK_END_ADDR (33)
#define SD_CMD_ERASE (38)
#define SD_CMD_APP_CMD (55)
#define SD_CMD_READ_OCR (58)
#define SD_CMD_CRC_ON_OFF (59)
/* Add a 0x40 to ACMD, so that it's clear what is meant.
* In rfat_disk_send_command() a 0x40 will set anyway.
*/
#define SD_ACMD_SD_STATUS (0x40+13)
#define SD_ACMD_SEND_NUM_WR_BLOCKS (0x40+22)
#define SD_ACMD_SET_WR_BLK_ERASE_COUNT (0x40+23)
#define SD_ACMD_SD_SEND_OP_COND (0x40+41)
#define SD_ACMD_SET_CLR_CARD_DETECT (0x40+42)
#define SD_ACMD_SEND_SCR (0x40+51)
#define SD_R1_VALID_MASK 0x80
#define SD_R1_VALID_DATA 0x00
#define SD_R1_IN_IDLE_STATE 0x01
#define SD_R1_ERASE_RESET 0x02
#define SD_R1_ILLEGAL_COMMAND 0x04
#define SD_R1_COM_CRC_ERROR 0x08
#define SD_R1_ERASE_SEQUENCE_ERROR 0x10
#define SD_R1_ADDRESS_ERROR 0x20
#define SD_R1_PARAMETER_ERROR 0x40
#define SD_R2_CARD_IS_LOCKED 0x01
#define SD_R2_WP_ERASE_SKIP 0x02
#define SD_R2_LOCK_UNLOCK_FAILED 0x02
#define SD_R2_EXECUTION_ERROR 0x04
#define SD_R2_CC_ERROR 0x08
#define SD_R2_CARD_ECC_FAILED 0x10
#define SD_R2_WP_VIOLATION 0x20
#define SD_R2_ERASE_PARAM 0x40
#define SD_R2_OUT_OF_RANGE 0x80
#define SD_R2_CSD_OVERWRITE 0x80
#define SD_READY_TOKEN 0xff /* host -> card, card -> host */
#define SD_START_READ_TOKEN 0xfe /* card -> host */
#define SD_START_WRITE_SINGLE_TOKEN 0xfe /* host -> card */
#define SD_START_WRITE_MULTIPLE_TOKEN 0xfc /* host -> card */
#define SD_STOP_TRANSMISSION_TOKEN 0xfd /* host -> card */
/* data response token for WRITE */
#define SD_DATA_RESPONSE_MASK 0x1f
#define SD_DATA_RESPONSE_ACCEPTED 0x05
#define SD_DATA_RESPONSE_CRC_ERROR 0x0b
#define SD_DATA_RESPONSE_WRITE_ERROR 0x0d
/* data error token for READ */
#define SD_DATA_ERROR_TOKEN_VALID_MASK 0xf0
#define SD_DATA_ERROR_TOKEN_VALID_DATA 0x00
#define SD_DATA_ERROR_EXECUTION_ERROR 0x01
#define SD_DATA_ERROR_CC_ERROR 0x02
#define SD_DATA_ERROR_CARD_ECC_FAILED 0x04
#define SD_DATA_ERROR_OUT_OF_RANGE 0x08
#if (RFAT_CONFIG_DISK_CRC == 1)
const uint8_t rfat_crc7_table[256]= {
0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
};
const uint16_t rfat_crc16_table[256]= {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
uint8_t rfat_compute_crc7(const uint8_t *data, uint32_t count)
{
unsigned int n;
uint8_t crc7 = 0;
for (n = 0; n < count; n++)
{
RFAT_UPDATE_CRC7(crc7, data[n]);
}
return crc7;
}
uint16_t rfat_compute_crc16(const uint8_t *data, uint32_t count)
{
unsigned int n;
uint16_t crc16 = 0;
for (n = 0; n < count; n++)
{
RFAT_UPDATE_CRC16(crc16, data[n]);
}
return crc16;
}
#endif /* (RFAT_CONFIG_DISK_CRC == 1) */
/*
* rfat_disk_wait_ready(rfat_disk_t *disk)
*
* Wait till DO transitions from BUSY (0x00) to READY (0xff).
*/
static int rfat_disk_wait_ready(rfat_disk_t *disk)
{
int status = F_NO_ERROR;
unsigned int n;
uint8_t response;
/* While waiting for non busy (not 0x00) the host can
* release the CS line to let somebody else access the
* bus. However there needs to be an extra clock
* cycle after driving CS to H for the card to release DO,
* as well as one extra clock cycle after driving CS to L
* before the data is valid again.
*/
#if defined(RFAT_PORT_DISK_TIME_START)
/* If there is a timer available, do a quick loop to avoid
* having to query the possibly expensive timer.
*/
for (n = 0; n < 64; n++)
{
response = RFAT_PORT_DISK_SPI_RECEIVE();
if (response == SD_READY_TOKEN)
{
break;
}
}
if (response != SD_READY_TOKEN)
{
RFAT_PORT_DISK_TIME_START();
do
{
response = RFAT_PORT_DISK_SPI_RECEIVE();
if (response != SD_READY_TOKEN)
{
if (RFAT_PORT_DISK_TIME_ELAPSED(250))
{
break;
}
#if defined(RFAT_PORT_DISK_YIELD)
RFAT_PORT_DISK_SPI_DESELECT();
RFAT_PORT_DISK_UNLOCK();
RFAT_PORT_DISK_YIELD();
status = RFAT_PORT_DISK_LOCK();
if (status == F_NO_ERROR)
{
RFAT_PORT_DISK_SPI_SELECT();
}
#endif /* RFAT_PORT_DISK_SPI_YIELD */
}
}
while ((status == F_NO_ERROR) && (response != SD_READY_TOKEN));
}
#else /* RFAT_PORT_DISK_TIME_START */
/* If there is no time available, loop in 256 transfer chunks.
* Each transfer takes up 8 cycles on the bus. Hence the loop will
* consume at least 2048 clock cycles. Since the speed of the bus is
* known, one can derive a timeout from there.
*/
uint32_t cycles = 0;
do
{
for (n = 0; n < 256; n++)
{
response = RFAT_PORT_DISK_SPI_RECEIVE();
if (response == SD_READY_TOKEN)
{
break;
}
}
if (response != SD_READY_TOKEN)
{
cycles += (2048 * (1000 / 250));
}
}
while ((response != SD_READY_TOKEN) && (cycles < disk->speed));
#endif /* RFAT_PORT_DISK_TIME_START */
disk->flags &= ~RFAT_DISK_FLAG_COMMAND_SUBSEQUENT;
if (response != SD_READY_TOKEN)
{
status = F_ERR_ONDRIVE;
}
return status;
}
static int rfat_disk_send_command(rfat_disk_t *disk, uint8_t index, const uint32_t argument, uint32_t count)
{
int status = F_NO_ERROR;
unsigned int n;
uint8_t data[5], response, crc7;
#if (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_COMMAND_RETRIES != 0)
unsigned int retries = RFAT_CONFIG_DISK_COMMAND_RETRIES +1;
#else /* (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_COMMAND_RETRIES != 0) */
unsigned int retries = 0;
#endif /* (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_COMMAND_RETRIES != 0) */
RFAT_DISK_STATISTICS_COUNT(disk_send_command);
data[0] = 0x40 | index;
data[1] = argument >> 24;
data[2] = argument >> 16;
data[3] = argument >> 8;
data[4] = argument >> 0;
#if (RFAT_CONFIG_DISK_CRC == 1)
crc7 = (rfat_compute_crc7(data, 5) << 1) | 0x01;
#else /* (RFAT_CONFIG_DISK_CRC == 1) */
if (index == SD_CMD_GO_IDLE_STATE)
{
crc7 = 0x95;
}
else if (index == SD_CMD_SEND_IF_COND)
{
crc7 = 0x87;
}
else
{
crc7 = 0x01;
}
#endif /* (RFAT_CONFIG_DISK_CRC == 1) */
do
{
/* A command needs at least one back to back idle cycle. Unless of
* course it's known to have this extra byte seen already.
*/
if (disk->flags & RFAT_DISK_FLAG_COMMAND_SUBSEQUENT)
{
RFAT_PORT_DISK_SPI_RECEIVE();
}
disk->flags |= RFAT_DISK_FLAG_COMMAND_SUBSEQUENT;
RFAT_PORT_DISK_SPI_SEND(data[0]);
RFAT_PORT_DISK_SPI_SEND(data[1]);
RFAT_PORT_DISK_SPI_SEND(data[2]);
RFAT_PORT_DISK_SPI_SEND(data[3]);
RFAT_PORT_DISK_SPI_SEND(data[4]);
RFAT_PORT_DISK_SPI_SEND(crc7);
/* NCR is 1..8 bytes, so simply always discard the first byte,
* and then read up to 8 bytes or till a vaild response
* was seen. N.b that STOP_TRANSMISSION specifies that
* the first byte on DataOut after reception of the command
* is a stuffing byte that has to be ignored. The discard
* takes care of that here.
*/
RFAT_PORT_DISK_SPI_RECEIVE();
for (n = 0; n < 8; n++)
{
response = RFAT_PORT_DISK_SPI_RECEIVE();
if (!(response & 0x80))
{
/*
* A STOP_TRANSMISSION can be issued before the card
* had send a "Data Error Token" for that last block
* that we are not really intrested in. This could result
* in a "Parameter Error" if the next block is out of bounds.
* Due to the way CMD_STOP_TRANSMISSION gets send there is
* also the chance it gets an "Illegal Command" error ...
*/
if (index == SD_CMD_STOP_TRANSMISSION)
{
response &= ~(SD_R1_ILLEGAL_COMMAND | SD_R1_PARAMETER_ERROR);
}
break;
}
}
disk->response[0] = response;
/* This below is somewhat tricky. There can be multiple communication
* failures:
*
* - card not responding
* - noise on the DATA line
* - noise on the CLK line
*
* If the card does not respond there should be 1xxxxxxxb as a response.
* If there is noise on the DATA line a CRC error is detect with a
* 0xxx1xxxx response.
*
* If there is noise on the CLK line, bits will be missing. The loop
* up there will throw out anything with a 1xxxxxxxb pattern. Hence if
* bits are missing the possible replies are (n.b. that the CRC error
* bit will be set, and the missing bits will be filled in as ones
* from the right):
*
* 00010001
* 00100011
* 01000111
* 00111111
* 01111111
*
* So in a nutshell, bit 0 will be always set, and at least one other bit
* will be set. This means 0x01 is a legal pattern. N.b. that without
* CRC only the "card not responding" case can be addressed.
*
* If such errors occur, a retry process is used, whereby the CS line
* is toggled to allow the card to resync.
*/
if (
#if (RFAT_CONFIG_DISK_CRC == 1)
((response != 0x01) && (response & 0x89))
#else /* (RFAT_CONFIG_DISK_CRC == 1) */
(response & 0x80)
#endif /* (RFAT_CONFIG_DISK_CRC == 1) */
)
{
#if (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_COMMAND_RETRIES != 0)
if (retries > 1)
{
RFAT_PORT_DISK_SPI_DESELECT();
RFAT_PORT_DISK_SPI_SELECT();
disk->flags &= ~RFAT_DISK_FLAG_COMMAND_SUBSEQUENT;
RFAT_DISK_STATISTICS_COUNT(disk_send_command_retry);
retries--;
}
else
#endif /* (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_COMMAND_RETRIES != 0) */
{
status = F_ERR_ONDRIVE;
retries = 0;
}
}
else
{
/* Always read the rest of the data to avoid synchronization
* issues. Worst case the data read is random.
*/
for (n = 1; n <= count; n++)
{
disk->response[n] = RFAT_PORT_DISK_SPI_RECEIVE();
}
if (response != 0x00)
{
if (disk->state != RFAT_DISK_STATE_RESET)
{
status = F_ERR_ONDRIVE;
}
}
retries = 0;
}
}
while (retries != 0);
if (status != F_NO_ERROR)
{
RFAT_DISK_STATISTICS_COUNT(disk_send_command_fail);
}
return status;
}
static int rfat_disk_send_data(rfat_disk_t *disk, uint8_t token, const uint8_t *data, uint32_t count, unsigned int *p_retries)
{
int status = F_NO_ERROR;
unsigned int retries = *p_retries;
uint8_t response;
#if !defined(RFAT_PORT_DISK_SPI_SEND_BLOCK)
unsigned int n;
uint32_t crc16
#endif /* !RFAT_PORT_DISK_SPI_SEND_BLOCK */
RFAT_DISK_STATISTICS_COUNT(disk_send_data);
RFAT_PORT_DISK_SPI_SEND(token);
#if defined(RFAT_PORT_DISK_SPI_SEND_BLOCK)
RFAT_PORT_DISK_SPI_SEND_BLOCK(data);
#else /* RFAT_PORT_DISK_SPI_SEND_BLOCK */
crc16 = 0;
for (n = 0; n < count; n++)
{
#if (RFAT_CONFIG_DISK_CRC == 1)
RFAT_UPDATE_CRC16(crc16, data[n]);
#endif /* (RFAT_CONFIG_DISK_CRC == 1) */
RFAT_PORT_DISK_SPI_SEND(data[n]);
}
RFAT_PORT_DISK_SPI_SEND(crc16 >> 8);
RFAT_PORT_DISK_SPI_SEND(crc16);
#endif /* RFAT_PORT_DISK_SPI_SEND_BLOCK */
/* At last read back the "Data Response Token":
*
* 0x05 No Error
* 0x0b CRC Error
* 0x0d Write Error
*/
response = RFAT_PORT_DISK_SPI_RECEIVE() & SD_DATA_RESPONSE_MASK;
if (response == SD_DATA_RESPONSE_ACCEPTED)
{
retries = 0;
}
else
{
#if (RFAT_CONFIG_DISK_CRC == 1)
/* But then it get's interesting. It's possible that the start token
* morphed into a STOP_TRANSMISSION token, or got lost all together.
* In that case there would be a BUSY state. So one had to wait till
* that was done before issuing the CMD_STOP_TRANSMISSION later on.
* The other case is where clock pulses were lost. In that cases the
* toggle of CS line will resync the clock, and we'd end up in
* a READY state after one dummy byte. But there might be still data
* left over. This left over data will predictably end up in a
* DATA_RESPONSE_CRC_ERROR, which shares R1_COM_CRC_ERROR with a normal
* command response. Hence the subsequent CMDP_STOP_TRANSMISSION will
* consume that left over data as 0xff or 0x0b ... and due to the retry
* mechanism resync.
*/
RFAT_PORT_DISK_SPI_DESELECT();
RFAT_PORT_DISK_SPI_SELECT();
status = rfat_disk_wait_ready(disk);
if (status == F_NO_ERROR)
#endif /* (RFAT_CONFIG_DISK_CRC == 1) */
{
/* A non-accepted "Data Response Token" in a write multiple block
* operation shall be followed by a CMD_STOP_TRANSMISSION
* (not a "Stop Token").
*/
status = rfat_disk_send_command(disk, SD_CMD_STOP_TRANSMISSION, 0, 0);
if (status == F_NO_ERROR)
{
status = rfat_disk_wait_ready(disk);
if (status == F_NO_ERROR)
{
disk->state = RFAT_DISK_STATE_READY;
status = rfat_disk_send_command(disk, SD_CMD_SEND_STATUS, 0, 1);
if (status == F_NO_ERROR)
{
if (disk->response[0] != 0x00)
{
/* Here the complete error response is available, so one can find out the
* true cause for the write error.
*/
if (disk->response[1] & (SD_R2_CARD_IS_LOCKED | SD_R2_WP_ERASE_SKIP | SD_R2_EXECUTION_ERROR | SD_R2_CC_ERROR | SD_R2_ERASE_PARAM | SD_R2_OUT_OF_RANGE))
{
status = F_ERR_ONDRIVE;
}
else if (disk->response[1] & SD_R2_WP_VIOLATION)
{
status = F_ERR_WRITEPROTECT;
}
else
{
/* CARD_ECC_FAILED */
status = F_ERR_INVALIDSECTOR;
}
retries = 0;
}
else
{
/* If there was not error posted, it must have been a CRC error, so
* let's restart the operatio if possible ...
*/
#if (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_DATA_RETRIES != 0)
if (retries > 1)
{
RFAT_DISK_STATISTICS_COUNT(disk_send_data_retry);
retries--;
}
else
#endif /* (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_DATA_RETRIES != 0) */
{
status = F_ERR_WRITE;
retries = 0;
}
}
}
}
}
}
}
if (status != F_NO_ERROR)
{
RFAT_DISK_STATISTICS_COUNT(disk_send_data_fail);
}
#if (RFAT_CONFIG_DISK_DATA_RETRIES == 0)
/* There are paths throu the code when "status" gets set,
* but "retries" does not get touched. So if "retries"
* is known to be 0, make it so.
*/
retries = 0;
#endif /* (RFAT_CONFIG_DISK_DATA_RETRIES == 0) */
*p_retries = retries;
return status;
}
static int rfat_disk_receive_data(rfat_disk_t *disk, uint8_t *data, uint32_t count, unsigned int *p_retries)
{
int status = F_NO_ERROR;
unsigned int n;
unsigned int retries = *p_retries;
uint8_t token;
#if (RFAT_CONFIG_DISK_CRC == 1)
uint32_t crc16;
#endif /* (RFAT_CONFIG_DISK_CRC == 1) */
RFAT_DISK_STATISTICS_COUNT(disk_receive_data);
/* Before we waited for a non 0xff token.
* If a "Start Block Token" (0xfe) zips by then
* a data block will follow. Otherwise a "Data Error Token"
* shows up:
*
* 0x01 Execution Error
* 0x02 CC Error
* 0x04 Card ECC failed
* 0x08 Out of Range
*
* The maximum documented timeout is 100ms for SDHC.
*/
#if defined(RFAT_PORT_DISK_TIME_START)
/* If there is a timer available, do a quick loop to avoid
* having to query the expensive timer.
*/
for (n = 0; n < 64; n++)
{
token = RFAT_PORT_DISK_SPI_RECEIVE();
if (token != SD_READY_TOKEN)
{
break;
}
}
if (token == SD_READY_TOKEN)
{
RFAT_PORT_DISK_TIME_START();
do
{
token = RFAT_PORT_DISK_SPI_RECEIVE();
if (token == SD_READY_TOKEN)
{
if (RFAT_PORT_DISK_TIME_ELAPSED(100))
{
break;
}
}
}
while (token == SD_READY_TOKEN);
}
#else /* RFAT_PORT_DISK_TIME_START */
/* If there is no time available, loop in 256 transfer chunks.
* Each transfer take up 8 cycles on the bus. Hence the loop will
* consume at least 2048 clock cycles. Since the speed of the bus is
* known, one can derive a timeout from there.
*/
uint32_t cycles = 0;
do
{
for (n = 0; n < 256; n++)
{
token = RFAT_PORT_DISK_SPI_RECEIVE();
if (token != SD_READY_TOKEN)
{
break;
}
}
if (token == SD_READY_TOKEN)
{
cycles += (2048 * 10); /* 100ms */
}
}
while ((token == SD_READY_TOKEN) && (cycles < disk->speed));
#endif /* RFAT_PORT_DISK_TIME_START */
if (token != SD_START_READ_TOKEN)
{
/* On an invalid token a toggle of the CS signal
* will resync the clock. The stop is required,
* as it's unclear as to whether the transfer is
* under way of not.
*/
RFAT_PORT_DISK_SPI_DESELECT();
RFAT_PORT_DISK_SPI_SELECT();
disk->flags &= ~RFAT_DISK_FLAG_COMMAND_SUBSEQUENT;
status = rfat_disk_send_command(disk, SD_CMD_STOP_TRANSMISSION, 0, 0);
if (status == F_NO_ERROR)
{
disk->state = RFAT_DISK_STATE_READY;
if ((token & SD_DATA_ERROR_TOKEN_VALID_MASK) != SD_DATA_ERROR_TOKEN_VALID_DATA)
{
#if (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_DATA_RETRIES != 0)
if (retries > 1)
{
RFAT_DISK_STATISTICS_COUNT(disk_receive_data_retry);
retries--;
}
else
#endif /* (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_DATA_RETRIES != 0) */
{
status = F_ERR_READ;
retries = 0;
}
}
else
{
if (token & (SD_DATA_ERROR_EXECUTION_ERROR | SD_DATA_ERROR_CC_ERROR | SD_DATA_ERROR_OUT_OF_RANGE))
{
status = F_ERR_ONDRIVE;
}
else
{
/* CARD_ECC_FAILED */
status = F_ERR_INVALIDSECTOR;
}
retries = 0;
}
}
else
{
retries = 0;
}
}
else
{
#if (RFAT_CONFIG_DISK_CRC == 1)
#if defined(RFAT_PORT_DISK_SPI_RECEIVE_BLOCK)
if (count == RFAT_BLK_SIZE)
{
crc16 = RFAT_PORT_DISK_SPI_RECEIVE_BLOCK(data);
}
else
#endif /* RFAT_PORT_DISK_SPI_RECEIVE_BLOCK */
{
crc16 = 0;
for (n = 0; n < count; n++)
{
data[n] = RFAT_PORT_DISK_SPI_RECEIVE();
RFAT_UPDATE_CRC16(crc16, data[n]);
}
crc16 ^= (RFAT_PORT_DISK_SPI_RECEIVE() << 8);
crc16 ^= RFAT_PORT_DISK_SPI_RECEIVE();
}
if (crc16 != 0)
{
/* On an invalid token a toggle of the CS signal
* will resync the clock. The stop is required,
* as it's unclear as to whether the tranfer is
* under way of not.
*/
RFAT_PORT_DISK_SPI_DESELECT();
RFAT_PORT_DISK_SPI_SELECT();
disk->flags &= ~RFAT_DISK_FLAG_COMMAND_SUBSEQUENT;
status = rfat_disk_send_command(disk, SD_CMD_STOP_TRANSMISSION, 0, 0);
if (status == F_NO_ERROR)
{
disk->state = RFAT_DISK_STATE_READY;
#if (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_DATA_RETRIES != 0)
if (retries > 1)
{
RFAT_DISK_STATISTICS_COUNT(disk_receive_data_retry);
retries--;
}
else
#endif /* (RFAT_CONFIG_DISK_CRC == 1) && (RFAT_CONFIG_DISK_DATA_RETRIES != 0) */
{
status = F_ERR_READ;
retries = 0;
}
}
else
{
retries = 0;
}
}
else
{
retries = 0;
}
#else /* (RFAT_CONFIG_DISK_CRC == 1) */
#if defined(RFAT_PORT_DISK_SPI_RECEIVE_BLOCK)
if (count == RFAT_BLK_SIZE)
{
RFAT_PORT_DISK_SPI_RECEIVE_BLOCK(data);
}
else
#endif /* RFAT_PORT_DISK_SPI_RECEIVE_BLOCK */
{
for (n = 0; n < count; n++)
{
data[n] = RFAT_PORT_DISK_SPI_RECEIVE();
}
RFAT_PORT_DISK_SPI_RECEIVE();
RFAT_PORT_DISK_SPI_RECEIVE();
}
retries = 0;
#endif /* (RFAT_CONFIG_DISK_CRC == 1) */
}
if (status != F_NO_ERROR)
{
RFAT_DISK_STATISTICS_COUNT(disk_receive_data_fail);
}
#if (RFAT_CONFIG_DISK_DATA_RETRIES == 0)
/* There are paths throu the code when "status" gets set,
* but "retries" does not get touched. So if "retries"
* is known to be 0, make it so.
*/
retries = 0;
#endif /* (RFAT_CONFIG_DISK_DATA_RETRIES == 0) */
*p_retries = retries;
return status;
}
static int rfat_disk_reset(rfat_disk_t *disk)
{
int status = F_NO_ERROR;
unsigned int n, type;
RFAT_DISK_STATISTICS_COUNT(disk_reset);
type = RFAT_DISK_TYPE_NONE;
disk->speed = RFAT_PORT_DISK_SPI_MODE(RFAT_DISK_MODE_IDENTIFY);
/* Apply an initial CMD_GO_IDLE_STATE, so that the card is out of
* data read/write mode, and can properly respond.
*/
rfat_disk_send_command(disk, SD_CMD_GO_IDLE_STATE, 0, 0);
if (disk->response[0] != 0x01)
{
/* There could be 2 error scenarios. One is that the
* CMD_GO_IDLE_STATE was send while the card was waiting
* for the next "Start Block" / "Stop Transmission" token.
* The card will answer that normally by signaling BUSY,
* when means there would be a 0x00 response.
* The other case is that there was a reset request while
* being in the middle of a write transaction. As a result
* the card will send back a stream of non-zero values
* (READY or a "Data Response Token"), which can be handled
* by simple flushing the transaction (CRC will take care of
* rejecting the data ... without CRC the last write will be
* garbage.
*
* Hence first drain a possible write command, and then
* rety CMD_GO_IDLE_STATE after a rfat_disk_wait_ready().
* If the card is still in BUSY mode, then retry the
* CMD_GO_IDLE_STATE again.
*/
if (disk->response[0] != 0x00)
{
for (n = 0; n < 1024; n++)
{
RFAT_PORT_DISK_SPI_RECEIVE();
}
rfat_disk_send_command(disk, SD_CMD_GO_IDLE_STATE, 0, 0);
}
rfat_disk_wait_ready(disk);
rfat_disk_send_command(disk, SD_CMD_GO_IDLE_STATE, 0, 0);
if (disk->response[0] == 0x00)
{
rfat_disk_wait_ready(disk);
rfat_disk_send_command(disk, SD_CMD_GO_IDLE_STATE, 0, 0);
}
}
if (disk->response[0] == 0x01)
{
rfat_disk_send_command(disk, SD_CMD_SEND_IF_COND, 0x000001aa, 4);