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Diffstat (limited to 'os/hal/src/hal_mmcsd.c')
| -rw-r--r-- | os/hal/src/hal_mmcsd.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/os/hal/src/hal_mmcsd.c b/os/hal/src/hal_mmcsd.c new file mode 100644 index 000000000..b2cfb65a0 --- /dev/null +++ b/os/hal/src/hal_mmcsd.c @@ -0,0 +1,113 @@ +/*
+ 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 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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