1 files changed, 98 insertions, 0 deletions
diff --git a/os/hal/src/pal.c b/os/hal/src/pal.c
new file mode 100644
index 000000000..1f9d058d5
--- /dev/null
+++ b/os/hal/src/pal.c
@@ -0,0 +1,98 @@
+/*
+    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
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+#if CH_HAL_USE_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_portid, 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");
+
+  palWriteGroup(bus->bus_portid, bus->bus_mask, bus->bus_offset, bits);
+}
+
+/**
+ * @brief Programs a bus with the specified mode.
+ *
+ * @param[in] bus the I/O bus, pointer to a @p IOBus structure
+ * @param[in] mode the mode
+ *
+ * @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 palSetBusMode(IOBus *bus, uint_fast8_t mode) {
+
+  chDbgCheck((bus != NULL) &&
+             (bus->bus_offset > PAL_IOPORTS_WIDTH), "palSetBusMode");
+
+  palSetGroupMode(bus->bus_portid, bus->bus_mask, mode);
+}
+
+#endif /* CH_HAL_USE_PAL */
+
+/** @} */