/*! ----------------------------------------------------------------------------
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* @file deca_mutex.c
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* @brief IRQ interface / mutex implementation
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*
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* @attention
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*
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* Copyright 2013 (c) DecaWave Ltd, Dublin, Ireland.
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*
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* All rights reserved.
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*
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*/
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#include "deca_device_api.h"
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#include "port.h"
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// ---------------------------------------------------------------------------
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//
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// NB: The purpose of this file is to provide for microprocessor interrupt enable/disable, this is used for
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// controlling mutual exclusion from critical sections in the code where interrupts and background
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// processing may interact. The code using this is kept to a minimum and the disabling time is also
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// kept to a minimum, so blanket interrupt disable may be the easiest way to provide this. But at a
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// minimum those interrupts coming from the decawave device should be disabled/re-enabled by this activity.
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//
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// In porting this to a particular microprocessor, the implementer may choose to use #defines in the
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// deca_irq.h include file to map these calls transparently to the target system. Alternatively the
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// appropriate code may be embedded in the functions provided below.
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//
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// This mutex dependent on HW port.
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// If HW port uses EXT_IRQ line to receive ready/busy status from DW1000 then mutex should use this signal
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// If HW port not use EXT_IRQ line (i.e. SW polling) then no necessary for decamutex(on/off)
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//
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// For critical section use this mutex instead
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// __save_intstate()
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// __restore_intstate()
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// ---------------------------------------------------------------------------
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/*! ------------------------------------------------------------------------------------------------------------------
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* Function: decamutexon()
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*
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* Description: This function should disable interrupts. This is called at the start of a critical section
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* It returns the irq state before disable, this value is used to re-enable in decamutexoff call
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*
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* Note: The body of this function is defined in deca_mutex.c and is platform specific
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*
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* input parameters:
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*
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* output parameters
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*
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* returns the state of the DW1000 interrupt
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*/
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decaIrqStatus_t decamutexon(void)
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{
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decaIrqStatus_t s = port_GetEXT_IRQStatus();
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if(s) {
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port_DisableEXT_IRQ(); //disable the external interrupt line
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}
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return s ; // return state before disable, value is used to re-enable in decamutexoff call
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}
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/*! ------------------------------------------------------------------------------------------------------------------
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* Function: decamutexoff()
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*
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* Description: This function should re-enable interrupts, or at least restore their state as returned(&saved) by decamutexon
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* This is called at the end of a critical section
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*
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* Note: The body of this function is defined in deca_mutex.c and is platform specific
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*
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* input parameters:
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* @param s - the state of the DW1000 interrupt as returned by decamutexon
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*
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* output parameters
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*
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* returns the state of the DW1000 interrupt
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*/
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void decamutexoff(decaIrqStatus_t s) // put a function here that re-enables the interrupt at the end of the critical section
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{
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if(s) { //need to check the port state as we can't use level sensitive interrupt on the STM ARM
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port_EnableEXT_IRQ();
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}
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}
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