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/*
ChibiOS/HAL - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013,2014 Giovanni Di Sirio.
This file is part of ChibiOS/HAL
ChibiOS/HAL 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 hal_mmcsd.c
* @brief MMC/SD cards common code.
*
* @addtogroup MMCSD
* @{
*/
#include "hal.h"
#if HAL_USE_MMC_SPI || HAL_USE_SDC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* 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;
osalDbgCheck((end >= start) && ((end - start) < 32));
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 */
/** @} */
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