1 files changed, 128 insertions, 0 deletions
diff --git a/libmaple/include/libmaple/bitband.h b/libmaple/include/libmaple/bitband.h
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+++ b/libmaple/include/libmaple/bitband.h
@@ -0,0 +1,128 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2011 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file libmaple/include/libmaple/bitband.h
+ *
+ * @brief Bit-banding utility functions
+ */
+
+#ifndef _LIBMAPLE_BITBAND_H_
+#define _LIBMAPLE_BITBAND_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <libmaple/libmaple_types.h>
+
+#define BB_SRAM_REF      0x20000000
+#define BB_SRAM_BASE     0x22000000
+#define BB_PERI_REF      0x40000000
+#define BB_PERI_BASE     0x42000000
+
+static inline volatile uint32* __bb_addr(volatile void*,
+                                         uint32,
+                                         uint32,
+                                         uint32);
+
+/**
+ * @brief Obtain a pointer to the bit-band address corresponding to a
+ *        bit in a volatile SRAM address.
+ * @param address Address in the bit-banded SRAM region
+ * @param bit     Bit in address to bit-band
+ */
+static inline volatile uint32* bb_sramp(volatile void *address, uint32 bit) {
+    return __bb_addr(address, bit, BB_SRAM_BASE, BB_SRAM_REF);
+}
+
+/**
+ * @brief Get a bit from an address in the SRAM bit-band region.
+ * @param address Address in the SRAM bit-band region to read from
+ * @param bit Bit in address to read
+ * @return bit's value in address.
+ */
+static inline uint8 bb_sram_get_bit(volatile void *address, uint32 bit) {
+    return *bb_sramp(address, bit);
+}
+
+/**
+ * @brief Set a bit in an address in the SRAM bit-band region.
+ * @param address Address in the SRAM bit-band region to write to
+ * @param bit Bit in address to write to
+ * @param val Value to write for bit, either 0 or 1.
+ */
+static inline void bb_sram_set_bit(volatile void *address,
+                                   uint32 bit,
+                                   uint8 val) {
+    *bb_sramp(address, bit) = val;
+}
+
+/**
+ * @brief Obtain a pointer to the bit-band address corresponding to a
+ *        bit in a peripheral address.
+ * @param address Address in the bit-banded peripheral region
+ * @param bit     Bit in address to bit-band
+ */
+static inline volatile uint32* bb_perip(volatile void *address, uint32 bit) {
+    return __bb_addr(address, bit, BB_PERI_BASE, BB_PERI_REF);
+}
+
+/**
+ * @brief Get a bit from an address in the peripheral bit-band region.
+ * @param address Address in the peripheral bit-band region to read from
+ * @param bit Bit in address to read
+ * @return bit's value in address.
+ */
+static inline uint8 bb_peri_get_bit(volatile void *address, uint32 bit) {
+    return *bb_perip(address, bit);
+}
+
+/**
+ * @brief Set a bit in an address in the peripheral bit-band region.
+ * @param address Address in the peripheral bit-band region to write to
+ * @param bit Bit in address to write to
+ * @param val Value to write for bit, either 0 or 1.
+ */
+static inline void bb_peri_set_bit(volatile void *address,
+                                   uint32 bit,
+                                   uint8 val) {
+    *bb_perip(address, bit) = val;
+}
+
+static inline volatile uint32* __bb_addr(volatile void *address,
+                                         uint32 bit,
+                                         uint32 bb_base,
+                                         uint32 bb_ref) {
+    return (volatile uint32*)(bb_base + ((uint32)address - bb_ref) * 32 +
+                              bit * 4);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif