/* | |
* FreeRTOS Kernel V10.0.1 | |
* Copyright (C) 2017 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! | |
*/ | |
/* Kernel includes. */ | |
#include "FreeRTOS.h" | |
#include "semphr.h" | |
#include "task.h" | |
/* Demo includes. */ | |
#include "emac.h" | |
/* uIP includes. */ | |
#include "uip.h" | |
/* Hardware library includes. */ | |
#include "hw_types.h" | |
#include "hw_memmap.h" | |
#include "hw_ints.h" | |
#include "hw_ethernet.h" | |
#include "ethernet.h" | |
#include "interrupt.h" | |
#define emacNUM_RX_BUFFERS 5 | |
#define emacFRAM_SIZE_BYTES 2 | |
#define macNEGOTIATE_DELAY 2000 | |
#define macWAIT_SEND_TIME ( 10 ) | |
/* The task that handles the MAC peripheral. This is created at a high | |
priority and is effectively a deferred interrupt handler. The peripheral | |
handling is deferred to a task to prevent the entire FIFO having to be read | |
from within an ISR. */ | |
void vMACHandleTask( void *pvParameters ); | |
/*-----------------------------------------------------------*/ | |
/* The semaphore used to wake the uIP task when data arrives. */ | |
SemaphoreHandle_t xEMACSemaphore = NULL; | |
/* The semaphore used to wake the interrupt handler task. The peripheral | |
is processed at the task level to prevent the need to read the entire FIFO from | |
within the ISR itself. */ | |
SemaphoreHandle_t xMACInterruptSemaphore = NULL; | |
/* The buffer used by the uIP stack. In this case the pointer is used to | |
point to one of the Rx buffers. */ | |
unsigned char *uip_buf; | |
/* Buffers into which Rx data is placed. */ | |
static unsigned char ucRxBuffers[ emacNUM_RX_BUFFERS ][ UIP_BUFSIZE + ( 4 * emacFRAM_SIZE_BYTES ) ] __attribute__((aligned(4))); | |
/* The length of the data within each of the Rx buffers. */ | |
static unsigned long ulRxLength[ emacNUM_RX_BUFFERS ]; | |
/* Used to keep a track of the number of bytes to transmit. */ | |
static unsigned long ulNextTxSpace; | |
/*-----------------------------------------------------------*/ | |
portBASE_TYPE vInitEMAC( void ) | |
{ | |
unsigned long ulTemp; | |
portBASE_TYPE xReturn; | |
/* Ensure all interrupts are disabled. */ | |
EthernetIntDisable( ETH_BASE, ( ETH_INT_PHY | ETH_INT_MDIO | ETH_INT_RXER | ETH_INT_RXOF | ETH_INT_TX | ETH_INT_TXER | ETH_INT_RX)); | |
/* Clear any interrupts that were already pending. */ | |
ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE ); | |
EthernetIntClear( ETH_BASE, ulTemp ); | |
/* Initialise the MAC and connect. */ | |
EthernetInit( ETH_BASE ); | |
EthernetConfigSet( ETH_BASE, ( ETH_CFG_TX_DPLXEN | ETH_CFG_TX_CRCEN | ETH_CFG_TX_PADEN ) ); | |
EthernetEnable( ETH_BASE ); | |
/* Mark each Rx buffer as empty. */ | |
for( ulTemp = 0; ulTemp < emacNUM_RX_BUFFERS; ulTemp++ ) | |
{ | |
ulRxLength[ ulTemp ] = 0; | |
} | |
/* Create the queue and task used to defer the MAC processing to the | |
task level. */ | |
vSemaphoreCreateBinary( xMACInterruptSemaphore ); | |
xSemaphoreTake( xMACInterruptSemaphore, 0 ); | |
xReturn = xTaskCreate( vMACHandleTask, "MAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL ); | |
vTaskDelay( macNEGOTIATE_DELAY ); | |
/* We are only interested in Rx interrupts. */ | |
IntPrioritySet( INT_ETH, configKERNEL_INTERRUPT_PRIORITY ); | |
IntEnable( INT_ETH ); | |
EthernetIntEnable(ETH_BASE, ETH_INT_RX); | |
return xReturn; | |
} | |
/*-----------------------------------------------------------*/ | |
unsigned int uiGetEMACRxData( unsigned char *ucBuffer ) | |
{ | |
static unsigned long ulNextRxBuffer = 0; | |
unsigned int iLen; | |
iLen = ulRxLength[ ulNextRxBuffer ]; | |
if( iLen != 0 ) | |
{ | |
/* Leave room for the size at the start of the buffer. */ | |
uip_buf = &( ucRxBuffers[ ulNextRxBuffer ][ 2 ] ); | |
ulRxLength[ ulNextRxBuffer ] = 0; | |
ulNextRxBuffer++; | |
if( ulNextRxBuffer >= emacNUM_RX_BUFFERS ) | |
{ | |
ulNextRxBuffer = 0; | |
} | |
} | |
return iLen; | |
} | |
/*-----------------------------------------------------------*/ | |
void vInitialiseSend( void ) | |
{ | |
/* Set the index to the first byte to send - skipping over the size | |
bytes. */ | |
ulNextTxSpace = 2; | |
} | |
/*-----------------------------------------------------------*/ | |
void vIncrementTxLength( unsigned long ulLength ) | |
{ | |
ulNextTxSpace += ulLength; | |
} | |
/*-----------------------------------------------------------*/ | |
void vSendBufferToMAC( void ) | |
{ | |
unsigned long *pulSource; | |
unsigned short * pus; | |
unsigned long ulNextWord; | |
/* Locate the data to be send. */ | |
pus = ( unsigned short * ) uip_buf; | |
/* Add in the size of the data. */ | |
pus--; | |
*pus = ulNextTxSpace; | |
/* Wait for data to be sent if there is no space immediately. */ | |
while( !EthernetSpaceAvail( ETH_BASE ) ) | |
{ | |
vTaskDelay( macWAIT_SEND_TIME ); | |
} | |
pulSource = ( unsigned long * ) pus; | |
for( ulNextWord = 0; ulNextWord < ulNextTxSpace; ulNextWord += sizeof( unsigned long ) ) | |
{ | |
HWREG(ETH_BASE + MAC_O_DATA) = *pulSource; | |
pulSource++; | |
} | |
/* Go. */ | |
HWREG( ETH_BASE + MAC_O_TR ) = MAC_TR_NEWTX; | |
} | |
/*-----------------------------------------------------------*/ | |
void vEMAC_ISR( void ) | |
{ | |
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
unsigned long ulTemp; | |
/* Clear the interrupt. */ | |
ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE ); | |
EthernetIntClear( ETH_BASE, ulTemp ); | |
/* Was it an Rx interrupt? */ | |
if( ulTemp & ETH_INT_RX ) | |
{ | |
xSemaphoreGiveFromISR( xMACInterruptSemaphore, &xHigherPriorityTaskWoken ); | |
EthernetIntDisable( ETH_BASE, ETH_INT_RX ); | |
} | |
/* Switch to the uIP task. */ | |
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); | |
} | |
/*-----------------------------------------------------------*/ | |
void vMACHandleTask( void *pvParameters ) | |
{ | |
unsigned long i; | |
unsigned long ulLength, ulInt; | |
unsigned long *pulBuffer; | |
static unsigned long ulNextRxBuffer = 0; | |
for( ;; ) | |
{ | |
/* Wait for something to do. */ | |
xSemaphoreTake( xMACInterruptSemaphore, portMAX_DELAY ); | |
while( ( ulInt = ( EthernetIntStatus( ETH_BASE, pdFALSE ) & ETH_INT_RX ) ) != 0 ) | |
{ | |
ulLength = HWREG( ETH_BASE + MAC_O_DATA ); | |
/* Leave room at the start of the buffer for the size. */ | |
pulBuffer = ( unsigned long * ) &( ucRxBuffers[ ulNextRxBuffer ][ 2 ] ); | |
*pulBuffer = ( ulLength >> 16 ); | |
/* Get the size of the data. */ | |
pulBuffer = ( unsigned long * ) &( ucRxBuffers[ ulNextRxBuffer ][ 4 ] ); | |
ulLength &= 0xFFFF; | |
if( ulLength > 4 ) | |
{ | |
ulLength -= 4; | |
if( ulLength >= UIP_BUFSIZE ) | |
{ | |
/* The data won't fit in our buffer. Ensure we don't | |
try to write into the buffer. */ | |
ulLength = 0; | |
} | |
/* Read out the data into our buffer. */ | |
for( i = 0; i < ulLength; i += sizeof( unsigned long ) ) | |
{ | |
*pulBuffer = HWREG( ETH_BASE + MAC_O_DATA ); | |
pulBuffer++; | |
} | |
/* Store the length of the data into the separate array. */ | |
ulRxLength[ ulNextRxBuffer ] = ulLength; | |
/* Use the next buffer the next time through. */ | |
ulNextRxBuffer++; | |
if( ulNextRxBuffer >= emacNUM_RX_BUFFERS ) | |
{ | |
ulNextRxBuffer = 0; | |
} | |
/* Ensure the uIP task is not blocked as data has arrived. */ | |
xSemaphoreGive( xEMACSemaphore ); | |
} | |
} | |
EthernetIntEnable( ETH_BASE, ETH_INT_RX ); | |
} | |
} | |