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digistump-sam/system/libsam/include/interrupt_sam_nvic.h

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+/* ----------------------------------------------------------------------------
+ *         SAM Software Package License
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2011-2012, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following condition is met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef UTILS_INTERRUPT_INTERRUPT_H
+#define UTILS_INTERRUPT_INTERRUPT_H
+
+#include "../chip.h"
+
+/**
+ * \weakgroup interrupt_group
+ *
+ * @{
+ */
+
+/**
+ * \name Interrupt Service Routine definition
+ *
+ * @{
+ */
+
+/**
+ * \brief Define service routine
+ *
+ * \note For NVIC devices the interrupt service routines are predefined to
+ *       add to vector table in binary generation, so there is no service
+ *       register at run time. The routine collections are in exceptions.h.
+ *
+ * Usage:
+ * \code
+ * ISR(foo_irq_handler)
+ * {
+ *      // Function definition
+ *      ...
+ * }
+ * \endcode
+ *
+ * \param func Name for the function.
+ */
+#  define ISR(func)    \
+	void func (void)
+
+/**
+ * \brief Initialize interrupt vectors
+ *
+ * For NVIC the interrupt vectors are put in vector table. So nothing
+ * to do to initialize them, except defined the vector function with
+ * right name.
+ *
+ * This must be called prior to \ref irq_register_handler.
+ */
+#  define irq_initialize_vectors()                     \
+	do {                                           \
+	} while(0)
+
+/**
+ * \brief Register handler for interrupt
+ *
+ * For NVIC the interrupt vectors are put in vector table. So nothing
+ * to do to register them, except defined the vector function with
+ * right name.
+ *
+ * Usage:
+ * \code
+ * irq_initialize_vectors();
+ * irq_register_handler(foo_irq_handler);
+ * \endcode
+ *
+ * \note The function \a func must be defined with the \ref ISR macro.
+ * \note The functions prototypes can be found in the device exception header
+ *       files (exceptions.h).
+ */
+#  define irq_register_handler(...)                    \
+	do {                                           \
+	} while(0)
+
+//@}
+
+#  define cpu_irq_enable()                             \
+	do {                                           \
+		g_interrupt_enabled = 1;            \
+		__DMB();                               \
+		__enable_irq();                        \
+	} while (0)
+#  define cpu_irq_disable()                            \
+	do {                                           \
+		__disable_irq();                       \
+		__DMB();                               \
+		g_interrupt_enabled = 0;           \
+	} while (0)
+
+typedef uint32_t irqflags_t;
+extern int g_interrupt_enabled;
+
+static inline irqflags_t cpu_irq_save(void)
+{
+	irqflags_t flags = g_interrupt_enabled;
+	cpu_irq_disable();
+	return flags;
+}
+
+static inline int cpu_irq_is_enabled_flags(irqflags_t flags)
+{
+	return (flags);
+}
+
+static inline void cpu_irq_restore(irqflags_t flags)
+{
+	if (cpu_irq_is_enabled_flags(flags))
+		cpu_irq_enable();
+}
+
+#define cpu_irq_is_enabled()    g_interrupt_enabled
+
+/**
+ * \weakgroup interrupt_deprecated_group
+ * @{
+ */
+
+#define Enable_global_interrupt()            cpu_irq_enable()
+#define Disable_global_interrupt()           cpu_irq_disable()
+#define Is_global_interrupt_enabled()        cpu_irq_is_enabled()
+
+//@}
+
+//@}
+
+#endif /* UTILS_INTERRUPT_INTERRUPT_H */