/* | |
* 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! | |
*/ | |
#include "FreeRTOS.h" | |
#include "task.h" | |
#include "semphr.h" | |
#include "SAM7_EMAC.h" | |
#include "AT91SAM7X256.h" | |
/*-----------------------------------------------------------*/ | |
/* The semaphore used to signal the arrival of new data to the interface | |
task. */ | |
static SemaphoreHandle_t xSemaphore = NULL; | |
/* The interrupt entry point is naked so we can control the context saving. */ | |
void vEMACISR_Wrapper( void ) __attribute__((naked)); | |
/* The interrupt handler function must be separate from the entry function | |
to ensure the correct stack frame is set up. */ | |
void vEMACISR_Handler( void ); | |
/*-----------------------------------------------------------*/ | |
/* | |
* The EMAC ISR. Handles both Tx and Rx complete interrupts. | |
*/ | |
void vEMACISR_Handler( void ) | |
{ | |
volatile unsigned long ulIntStatus, ulEventStatus; | |
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
extern void vClearEMACTxBuffer( void ); | |
/* Find the cause of the interrupt. */ | |
ulIntStatus = AT91C_BASE_EMAC->EMAC_ISR; | |
ulEventStatus = AT91C_BASE_EMAC->EMAC_RSR; | |
if( ( ulIntStatus & AT91C_EMAC_RCOMP ) || ( ulEventStatus & AT91C_EMAC_REC ) ) | |
{ | |
/* A frame has been received, signal the lwIP task so it can process | |
the Rx descriptors. */ | |
xSemaphoreGiveFromISR( xSemaphore, &xHigherPriorityTaskWoken ); | |
AT91C_BASE_EMAC->EMAC_RSR = AT91C_EMAC_REC; | |
} | |
if( ulIntStatus & AT91C_EMAC_TCOMP ) | |
{ | |
/* A frame has been transmitted. Mark all the buffers used by the | |
frame just transmitted as free again. */ | |
vClearEMACTxBuffer(); | |
AT91C_BASE_EMAC->EMAC_TSR = AT91C_EMAC_COMP; | |
} | |
/* Clear the interrupt. */ | |
AT91C_BASE_AIC->AIC_EOICR = 0; | |
/* If a task was woken by either a frame being received then we may need to | |
switch to another task. If the unblocked task was of higher priority then | |
the interrupted task it will then execute immediately that the ISR | |
completes. */ | |
if( xHigherPriorityTaskWoken ) | |
{ | |
portYIELD_FROM_ISR(); | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
void vEMACISR_Wrapper( void ) | |
{ | |
/* Save the context of the interrupted task. */ | |
portSAVE_CONTEXT(); | |
/* Call the handler to do the work. This must be a separate | |
function to ensure the stack frame is set up correctly. */ | |
vEMACISR_Handler(); | |
/* Restore the context of whichever task will execute next. */ | |
portRESTORE_CONTEXT(); | |
} | |
/*-----------------------------------------------------------*/ | |
void vPassEMACSemaphore( SemaphoreHandle_t xCreatedSemaphore ) | |
{ | |
/* Simply store the semaphore that should be used by the ISR. */ | |
xSemaphore = xCreatedSemaphore; | |
} | |