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/*
* \file
*
* \brief SAM Event System Controller Driver
*
* Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* 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
* EXPRESSLY AND SPECIFICALLY 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.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include "events.h"
#include "events_hooks.h"
#include "system_interrupt.h"
#if (SAML21) || (SAML22) || (SAMC20) || (SAMC21) || (SAMR30)
# define _EVENTS_INTFLAGS_DETECT 0x0fff0000
# define _EVENTS_INTFLAGS_OVERRUN 0x00000fff
#else
# define _EVENTS_INTFLAGS_DETECT 0x0f00ff00
# define _EVENTS_INTFLAGS_OVERRUN 0x000f00ff
#endif
#define _EVENTS_INTFLAGS_MASK (_EVENTS_INTFLAGS_DETECT | _EVENTS_INTFLAGS_OVERRUN)
extern struct _events_module _events_inst;
enum status_code events_create_hook(struct events_hook *hook, events_interrupt_hook func)
{
/* Initialize the hook struct members */
hook->next = NULL;
hook->resource = NULL;
hook->hook_func = func;
return STATUS_OK;
}
enum status_code events_add_hook(struct events_resource *resource, struct events_hook *hook)
{
struct events_hook *tmp_hook = NULL;
/* Associate the hook with the resource */
hook->resource = resource;
/* Check if this is the first hook in the list */
if (_events_inst.hook_list == NULL) {
_events_inst.hook_list = hook;
} else {
tmp_hook = _events_inst.hook_list;
/* Find the first free place in the list */
while (tmp_hook->next != NULL) {
tmp_hook = tmp_hook->next;
}
/* Put the hook into the next free place in the list */
tmp_hook->next = hook;
}
/* Check if interrupts from the EVSYS module is enabled in the interrupt controller */
if (!system_interrupt_is_enabled(SYSTEM_INTERRUPT_MODULE_EVSYS)) {
system_interrupt_enable(SYSTEM_INTERRUPT_MODULE_EVSYS);
}
return STATUS_OK;
}
enum status_code events_del_hook(struct events_resource *resource, struct events_hook *hook)
{
struct events_hook *tmp_hook = _events_inst.hook_list;
struct events_hook *last_hook = NULL;
if (tmp_hook != NULL) {
/* Check if the first hook in the list is the one we are looking for */
if (tmp_hook != hook) {
/* Don't double check the first hook */
tmp_hook = tmp_hook->next;
/* Check if the current hook is the one we are looking for */
while (tmp_hook != hook) {
/* If the current hook pointer is NULL the hook is not found in the list */
if(tmp_hook == NULL) {
return STATUS_ERR_NOT_FOUND;
}
last_hook = tmp_hook;
tmp_hook = tmp_hook->next;
}
/* Remove the current hook from the list */
last_hook->next = tmp_hook->next;
} else {
_events_inst.hook_list = tmp_hook->next;
}
} else {
/* No hooks where found in the list */
return STATUS_ERR_NO_MEMORY;
}
return STATUS_OK;
}
enum status_code events_enable_interrupt_source(struct events_resource *resource, enum events_interrupt_source source)
{
Assert((source == EVENTS_INTERRUPT_DETECT) || (source == EVENTS_INTERRUPT_OVERRUN));
if (source == EVENTS_INTERRUPT_DETECT) {
EVSYS->INTENSET.reg = _events_find_bit_position(resource->channel,
_EVENTS_START_OFFSET_DETECTION_BIT);
} else if (source == EVENTS_INTERRUPT_OVERRUN) {
EVSYS->INTENSET.reg = _events_find_bit_position(resource->channel,
_EVENTS_START_OFFSET_OVERRUN_BIT);
} else {
return STATUS_ERR_INVALID_ARG;
}
return STATUS_OK;
}
enum status_code events_disable_interrupt_source(struct events_resource *resource, enum events_interrupt_source source)
{
Assert((source == EVENTS_INTERRUPT_DETECT) || (source == EVENTS_INTERRUPT_OVERRUN));
if (source == EVENTS_INTERRUPT_DETECT) {
EVSYS->INTENCLR.reg = _events_find_bit_position(resource->channel,
_EVENTS_START_OFFSET_DETECTION_BIT);
} else if (source == EVENTS_INTERRUPT_OVERRUN) {
EVSYS->INTENCLR.reg = _events_find_bit_position(resource->channel,
_EVENTS_START_OFFSET_OVERRUN_BIT);
} else {
return STATUS_ERR_INVALID_ARG;
}
return STATUS_OK;
}
bool events_is_interrupt_set(struct events_resource *resource, enum events_interrupt_source source)
{
Assert((source == EVENTS_INTERRUPT_DETECT) || (source == EVENTS_INTERRUPT_OVERRUN));
uint32_t bitpos;
if (source == EVENTS_INTERRUPT_DETECT) {
bitpos = _events_find_bit_position(resource->channel,
_EVENTS_START_OFFSET_DETECTION_BIT);
} else if (source == EVENTS_INTERRUPT_OVERRUN) {
bitpos = _events_find_bit_position(resource->channel,
_EVENTS_START_OFFSET_OVERRUN_BIT);
} else {
return false;
}
return (bool)(_events_inst.interrupt_flag_buffer & bitpos);
}
enum status_code events_ack_interrupt(struct events_resource *resource, enum events_interrupt_source source)
{
Assert((source == EVENTS_INTERRUPT_DETECT) || (source == EVENTS_INTERRUPT_OVERRUN));
uint32_t bitpos;
if (source == EVENTS_INTERRUPT_DETECT) {
bitpos = _events_find_bit_position(resource->channel,
_EVENTS_START_OFFSET_DETECTION_BIT);
} else if (source == EVENTS_INTERRUPT_OVERRUN) {
bitpos = _events_find_bit_position(resource->channel,
_EVENTS_START_OFFSET_OVERRUN_BIT);
} else {
return STATUS_ERR_INVALID_ARG;
}
_events_inst.interrupt_flag_ack_buffer |= bitpos;
return STATUS_OK;
}
void EVSYS_Handler(void)
{
struct events_hook *current_hook = _events_inst.hook_list;
uint32_t flag;
/* Synch the interrupt flag buffer with the hardware register */
flag = EVSYS->INTFLAG.reg;
_events_inst.interrupt_flag_buffer |= flag;
/* Clear all hardware interrupt flags */
EVSYS->INTFLAG.reg = _EVENTS_INTFLAGS_MASK;
/* Traverse the linked list */
while (current_hook != NULL) {
current_hook->hook_func(current_hook->resource);
current_hook = current_hook->next;
}
/* Clear acknowledged interrupt sources from the interrupt flag buffer */
flag = _events_inst.interrupt_flag_ack_buffer;
_events_inst.interrupt_flag_buffer &= ~flag;
}
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