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