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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2012-05-10 12:26:24 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2012-05-10 12:26:24 +0000 |
| commit | 97dce7b94464b891a25170e6556daac5bb30f7ef (patch) | |
| tree | 41c359d3c2297f48867eb614be59c9f91d51e65d /os/hal/src/mmcsd.c | |
| parent | 6a8a643ab00e5964a3fb77e5b2394561bb797e55 (diff) | |
| download | ChibiOS-97dce7b94464b891a25170e6556daac5bb30f7ef.tar.gz ChibiOS-97dce7b94464b891a25170e6556daac5bb30f7ef.tar.bz2 ChibiOS-97dce7b94464b891a25170e6556daac5bb30f7ef.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@4180 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/hal/src/mmcsd.c')
| -rw-r--r-- | os/hal/src/mmcsd.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/os/hal/src/mmcsd.c b/os/hal/src/mmcsd.c new file mode 100644 index 000000000..88f8a5505 --- /dev/null +++ b/os/hal/src/mmcsd.c @@ -0,0 +1,120 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+ 2011,2012 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 Get slice with data from uint32_t[4] array.
+ *
+ * @notapi
+ */
+static uint32_t mmcsd_get_slice(uint32_t *data, uint32_t end, uint32_t start) {
+ uint32_t word = 0;
+ uint32_t mask = 0;
+
+ chDbgCheck(end >= start, "sdc_get_slice");
+
+ while ((start - 32 * word) > 31){
+ word++;
+ data++;
+ }
+
+ end -= 32 * word;
+ start -= 32 * word;
+
+ if (end < 31){
+ /* Value lays in one word.*/
+ mask = (1 << (end - start + 1)) - 1;
+ return (*data >> start) & mask;
+ }
+ else{
+ /* Value spread on separate words.*/
+ uint32_t lsb, msb;
+ lsb = *data >> start;
+ data++;
+ mask = (1 << (end - 32 + 1)) - 1;
+ msb = *data & mask;
+ msb = msb << (32 - start);
+ return msb | lsb;
+ }
+}
+
+/*===========================================================================*/
+/* 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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