115 lines
4.1 KiB
C
115 lines
4.1 KiB
C
/*
|
|
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
|
|
2011,2012,2013 Giovanni Di Sirio.
|
|
|
|
This file is part of ChibiOS/RT.
|
|
|
|
ChibiOS/RT is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ChibiOS/RT is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/**
|
|
* @file mmcsd.c
|
|
* @brief MMC/SD cards common code.
|
|
*
|
|
* @addtogroup MMCSD
|
|
* @{
|
|
*/
|
|
|
|
#include "ch.h"
|
|
#include "hal.h"
|
|
|
|
#if HAL_USE_MMC_SPI || HAL_USE_SDC || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local definitions. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local variables. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Gets a bit field from a words array.
|
|
* @note The bit zero is the LSb of the first word.
|
|
*
|
|
* @param[in] data pointer to the words array
|
|
* @param[in] end bit offset of the last bit of the field, inclusive
|
|
* @param[in] start bit offset of the first bit of the field, inclusive
|
|
*
|
|
* @return The bits field value, left aligned.
|
|
*
|
|
* @notapi
|
|
*/
|
|
static uint32_t mmcsd_get_slice(uint32_t *data, uint32_t end, uint32_t start) {
|
|
unsigned startidx, endidx, startoff;
|
|
uint32_t endmask;
|
|
|
|
chDbgCheck((end >= start) && ((end - start) < 32), "mmcsd_get_slice");
|
|
|
|
startidx = start / 32;
|
|
startoff = start % 32;
|
|
endidx = end / 32;
|
|
endmask = (1 << ((end % 32) + 1)) - 1;
|
|
|
|
/* One or two pieces?*/
|
|
if (startidx < endidx)
|
|
return (data[startidx] >> startoff) | /* Two pieces case. */
|
|
((data[endidx] & endmask) << (32 - startoff));
|
|
return (data[startidx] & endmask) >> startoff; /* One piece case. */
|
|
}
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Extract card capacity from a CSD.
|
|
* @details The capacity is returned as number of available blocks.
|
|
*
|
|
* @param[in] csd the CSD record
|
|
*
|
|
* @return The card capacity.
|
|
* @retval 0 CSD format error
|
|
*/
|
|
uint32_t mmcsdGetCapacity(uint32_t csd[4]) {
|
|
|
|
switch (csd[3] >> 30) {
|
|
uint32_t a, b, c;
|
|
case 0:
|
|
/* CSD version 1.0 */
|
|
a = mmcsd_get_slice(csd, MMCSD_CSD_10_C_SIZE_SLICE);
|
|
b = mmcsd_get_slice(csd, MMCSD_CSD_10_C_SIZE_MULT_SLICE);
|
|
c = mmcsd_get_slice(csd, MMCSD_CSD_10_READ_BL_LEN_SLICE);
|
|
return (a + 1) << (b + 2) << (c - 9); /* 2^9 == MMCSD_BLOCK_SIZE. */
|
|
case 1:
|
|
/* CSD version 2.0.*/
|
|
return 1024 * (mmcsd_get_slice(csd, MMCSD_CSD_20_C_SIZE_SLICE) + 1);
|
|
default:
|
|
/* Reserved value detected.*/
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
#endif /* HAL_USE_MMC_SPI || HAL_USE_SDC */
|
|
|
|
/** @} */
|