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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2009-06-07 10:27:48 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2009-06-07 10:27:48 +0000 |
| commit | 4fc5b696fad6b10620dcd49149bf64b829e38f77 (patch) | |
| tree | 4e2509a8201057aa54fc2cb22eac8188c738c4e5 /src/lib/pal.c | |
| parent | 9659a679baf31f9890d941c4e25617a7ca70756f (diff) | |
| download | ChibiOS-4fc5b696fad6b10620dcd49149bf64b829e38f77.tar.gz ChibiOS-4fc5b696fad6b10620dcd49149bf64b829e38f77.tar.bz2 ChibiOS-4fc5b696fad6b10620dcd49149bf64b829e38f77.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1019 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'src/lib/pal.c')
| -rw-r--r-- | src/lib/pal.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/lib/pal.c b/src/lib/pal.c new file mode 100644 index 000000000..045c35c20 --- /dev/null +++ b/src/lib/pal.c @@ -0,0 +1,70 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2007 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 pal.c
+ * @brief I/O Ports Abstraction Layer code
+ * @addtogroup PAL
+ * @{
+ */
+
+/**
+ * @brief Read from an I/O bus.
+ *
+ * @param[in] bus the I/O bus, pointer to a @p IOBus structure
+ * @return The bus logical states.
+ *
+ * @note The operation is not guaranteed to be atomic on all the architectures,
+ * for atomicity and/or portability reasons you may need to enclose port
+ * I/O operations between @p chSysLock() and @p chSysUnlock().
+ * @note The function internally uses the @p palReadGroup() macro. The use of
+ * this function is preferred when you value code size, readability and
+ * error checking over speed.
+ */
+ioportmask_t palReadBus(IOBus *bus) {
+
+ chDbgCheck((bus != NULL) &&
+ (bus->bus_offset > PAL_IOPORTS_WIDTH), "palReadBus");
+
+ return palReadGroup(bus->bus_port, bus->bus_mask, bus->bus_offset);
+}
+
+/**
+ * @brief Write to an I/O bus.
+ *
+ * @param[in] bus the I/O bus, pointer to a @p IOBus structure
+ * @param[in] bits the bits to be written on the I/O bus. Values exceeding
+ * the bus width are masked so most significant bits are lost.
+ *
+ * @note The operation is not guaranteed to be atomic on all the architectures,
+ * for atomicity and/or portability reasons you may need to enclose port
+ * I/O operations between @p chSysLock() and @p chSysUnlock().
+ * @note The default implementation is non atomic and not necessarily
+ * optimal. Low level drivers may optimize the function by using
+ * specific hardware or coding.
+ */
+void palWriteBus(IOBus *bus, ioportmask_t bits) {
+
+ chDbgCheck((bus != NULL) &&
+ (bus->bus_offset > PAL_IOPORTS_WIDTH), "palWriteBus");
+
+ palWriteBus(bus->bus_port, bus->bus_mask, bus->bus_offset, bits);
+}
+
+/** @} */
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