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/*
* Copyright (c) 2013 - 2014, Freescale Semiconductor, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*/
#include <assert.h>
#include "fsl_interrupt_manager.h"
/*******************************************************************************
* Definitions
******************************************************************************/
/*!
* @brief Counter to manage the nested callings of global disable/enable interrupt.
*/
uint32_t g_interruptDisableCount = 0;
/*******************************************************************************
* Code
******************************************************************************/
/*FUNCTION**********************************************************************
*
* Function Name : INT_SYS_InstallHandler
* Description : Install an interrupt handler routine for a given IRQ number
* This function will let application to register/replace the interrupt
* handler for specified IRQ number. IRQ number is different with Vector
* number. IRQ 0 will start from Vector 16 address. Refer to reference
* manual for details. Also refer to startup_MKxxxx.s file for each chip
* family to find out the default interrut handler for each device. This
* function will convert the IRQ number to vector number by adding 16 to
* it.
*
*END**************************************************************************/
void * INT_SYS_InstallHandler(IRQn_Type irqNumber, void (*handler)(void))
{
#if (defined(__CC_ARM))
extern uint32_t Image$$VECTOR_RAM$$Base[];
#define __VECTOR_RAM Image$$VECTOR_RAM$$Base
#else
extern uint32_t __VECTOR_RAM[];
#endif
/* Check IRQ number */
assert(FSL_FEATURE_INTERRUPT_IRQ_MIN <= irqNumber);
assert(irqNumber <= FSL_FEATURE_INTERRUPT_IRQ_MAX);
/* Check whether there is vector table in RAM */
assert(__VECTOR_RAM != 0U);
/* Save the former handler pointer */
void * retVal = (void *)__VECTOR_RAM[irqNumber + 16];
/* Set handler into vector table */
__VECTOR_RAM[irqNumber + 16] = (uint32_t)handler;
return retVal;
}
/*FUNCTION**********************************************************************
*
* Function Name : INT_SYS_EnableIRQGlobal
* Description : Enable system interrupt
* This function will enable the global interrupt by calling the core API
*
*END**************************************************************************/
void INT_SYS_EnableIRQGlobal(void)
{
/* check and update */
if (g_interruptDisableCount > 0)
{
g_interruptDisableCount--;
if (g_interruptDisableCount > 0)
{
return;
}
/* call core API to enable the global interrupt*/
__enable_irq();
}
}
/*FUNCTION**********************************************************************
*
* Function Name : INT_SYS_DisableIRQGlobal
* Description : Disnable system interrupt
* This function will disable the global interrupt by calling the core API
*
*END**************************************************************************/
void INT_SYS_DisableIRQGlobal(void)
{
/* call core API to disable the global interrupt*/
__disable_irq();
/* update counter*/
g_interruptDisableCount++;
}
/*******************************************************************************
* EOF
******************************************************************************/
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