/* | |
* FreeRTOS Kernel V10.1.1 | |
* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. | |
* | |
* 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. | |
* | |
* http://www.FreeRTOS.org | |
* http://aws.amazon.com/freertos | |
* | |
* 1 tab == 4 spaces! | |
*/ | |
/* Scheduler include files. */ | |
#include "FreeRTOS.h" | |
#include "task.h" | |
#include "queue.h" | |
/* Constants required for interrupt management. */ | |
#define tcpCLEAR_VIC_INTERRUPT ( 0 ) | |
#define tcpEINT0_VIC_CHANNEL_BIT ( ( unsigned long ) 0x4000 ) | |
/* EINT0 interrupt handler. This processes interrupts from the WIZnet device. */ | |
void vEINT0_ISR_Wrapper( void ) __attribute__((naked)); | |
/* The handler that goes with the EINT0 wrapper. */ | |
void vEINT0_ISR_Handler( void ); | |
/* Variable is required for its address, but does not otherwise get used. */ | |
static long lDummyVariable; | |
/* | |
* When the WIZnet device asserts an interrupt we send an (empty) message to | |
* the TCP task. This wakes the task so the interrupt can be processed. The | |
* source of the interrupt has to be ascertained by the TCP task as this | |
* requires an I2C transaction which cannot be performed from this ISR. | |
* Note this code predates the introduction of semaphores, a semaphore should | |
* be used in place of the empty queue message. | |
*/ | |
void vEINT0_ISR_Handler( void ) | |
{ | |
extern QueueHandle_t xTCPISRQueue; | |
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
/* Just wake the TCP task so it knows an ISR has occurred. */ | |
xQueueSendFromISR( xTCPISRQueue, ( void * ) &lDummyVariable, &xHigherPriorityTaskWoken ); | |
/* We cannot carry on processing interrupts until the TCP task has | |
processed this one - so for now interrupts are disabled. The TCP task will | |
re-enable it. */ | |
VICIntEnClear |= tcpEINT0_VIC_CHANNEL_BIT; | |
/* Clear the interrupt bit. */ | |
VICVectAddr = tcpCLEAR_VIC_INTERRUPT; | |
if( xHigherPriorityTaskWoken ) | |
{ | |
portYIELD_FROM_ISR(); | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
void vEINT0_ISR_Wrapper( void ) | |
{ | |
/* Save the context of the interrupted task. */ | |
portSAVE_CONTEXT(); | |
/* The handler must be a separate function from the wrapper to | |
ensure the correct stack frame is set up. */ | |
vEINT0_ISR_Handler(); | |
/* Restore the context of whichever task is going to run next. */ | |
portRESTORE_CONTEXT(); | |
} | |