/* | |
* FreeRTOS+TCP Labs Build 150406 (C) 2015 Real Time Engineers ltd. | |
* Authors include Hein Tibosch and Richard Barry | |
* | |
******************************************************************************* | |
***** NOTE ******* NOTE ******* NOTE ******* NOTE ******* NOTE ******* NOTE *** | |
*** *** | |
*** *** | |
*** FREERTOS+TCP IS STILL IN THE LAB: *** | |
*** *** | |
*** This product is functional and is already being used in commercial *** | |
*** products. Be aware however that we are still refining its design, *** | |
*** the source code does not yet fully conform to the strict coding and *** | |
*** style standards mandated by Real Time Engineers ltd., and the *** | |
*** documentation and testing is not necessarily complete. *** | |
*** *** | |
*** PLEASE REPORT EXPERIENCES USING THE SUPPORT RESOURCES FOUND ON THE *** | |
*** URL: http://www.FreeRTOS.org/contact Active early adopters may, at *** | |
*** the sole discretion of Real Time Engineers Ltd., be offered versions *** | |
*** under a license other than that described below. *** | |
*** *** | |
*** *** | |
***** NOTE ******* NOTE ******* NOTE ******* NOTE ******* NOTE ******* NOTE *** | |
******************************************************************************* | |
* | |
* - Open source licensing - | |
* While FreeRTOS+TCP is in the lab it is provided only under version two of the | |
* GNU General Public License (GPL) (which is different to the standard FreeRTOS | |
* license). FreeRTOS+TCP is free to download, use and distribute under the | |
* terms of that license provided the copyright notice and this text are not | |
* altered or removed from the source files. The GPL V2 text is available on | |
* the gnu.org web site, and on the following | |
* URL: http://www.FreeRTOS.org/gpl-2.0.txt. Active early adopters may, and | |
* solely at the discretion of Real Time Engineers Ltd., be offered versions | |
* under a license other then the GPL. | |
* | |
* FreeRTOS+TCP is distributed in the hope that it will be useful. You cannot | |
* use FreeRTOS+TCP unless you agree that you use the software 'as is'. | |
* FreeRTOS+TCP is provided WITHOUT ANY WARRANTY; without even the implied | |
* warranties of NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A PARTICULAR | |
* PURPOSE. Real Time Engineers Ltd. disclaims all conditions and terms, be they | |
* implied, expressed, or statutory. | |
* | |
* 1 tab == 4 spaces! | |
* | |
* http://www.FreeRTOS.org | |
* http://www.FreeRTOS.org/plus | |
* http://www.FreeRTOS.org/labs | |
* | |
*/ | |
/* Standard includes. */ | |
#include <stdint.h> | |
/* FreeRTOS includes. */ | |
#include "FreeRTOS.h" | |
#include "task.h" | |
#include "queue.h" | |
#include "semphr.h" | |
/* Hardware abstraction. */ | |
#include "FreeRTOS_IO.h" | |
/* FreeRTOS+TCP includes. */ | |
#include "FreeRTOS_UDP_IP.h" | |
#include "FreeRTOS_Sockets.h" | |
#include "NetworkBufferManagement.h" | |
/* Driver includes. */ | |
#include "lpc17xx_emac.h" | |
#include "lpc17xx_pinsel.h" | |
/* Demo includes. */ | |
#include "NetworkInterface.h" | |
#if ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES != 1 | |
#define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eProcessBuffer | |
#else | |
#define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eConsiderFrameForProcessing( ( pucEthernetBuffer ) ) | |
#endif | |
/* When a packet is ready to be sent, if it cannot be sent immediately then the | |
task performing the transmit will block for niTX_BUFFER_FREE_WAIT | |
milliseconds. It will do this a maximum of niMAX_TX_ATTEMPTS before giving | |
up. */ | |
#define niTX_BUFFER_FREE_WAIT ( pdMS_TO_TICKS( 2UL ) ) | |
#define niMAX_TX_ATTEMPTS ( 5 ) | |
/* The length of the queue used to send interrupt status words from the | |
interrupt handler to the deferred handler task. */ | |
#define niINTERRUPT_QUEUE_LENGTH ( 10 ) | |
/*-----------------------------------------------------------*/ | |
/* | |
* A deferred interrupt handler task that processes | |
*/ | |
static void prvEMACHandlerTask( void *pvParameters ); | |
/*-----------------------------------------------------------*/ | |
/* The queue used to communicate Ethernet events with the IP task. */ | |
extern QueueHandle_t xNetworkEventQueue; | |
/* The semaphore used to wake the deferred interrupt handler task when an Rx | |
interrupt is received. */ | |
static SemaphoreHandle_t xEMACRxEventSemaphore = NULL; | |
/*-----------------------------------------------------------*/ | |
BaseType_t xNetworkInterfaceInitialise( void ) | |
{ | |
EMAC_CFG_Type Emac_Config; | |
PINSEL_CFG_Type xPinConfig; | |
BaseType_t xStatus, xReturn; | |
extern uint8_t ucMACAddress[ 6 ]; | |
/* Enable Ethernet Pins */ | |
boardCONFIGURE_ENET_PINS( xPinConfig ); | |
Emac_Config.Mode = EMAC_MODE_AUTO; | |
Emac_Config.pbEMAC_Addr = ucMACAddress; | |
xStatus = EMAC_Init( &Emac_Config ); | |
LPC_EMAC->IntEnable &= ~( EMAC_INT_TX_DONE ); | |
if( xStatus != ERROR ) | |
{ | |
vSemaphoreCreateBinary( xEMACRxEventSemaphore ); | |
configASSERT( xEMACRxEventSemaphore ); | |
/* The handler task is created at the highest possible priority to | |
ensure the interrupt handler can return directly to it. */ | |
xTaskCreate( prvEMACHandlerTask, "EMAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL ); | |
/* Enable the interrupt and set its priority to the minimum | |
interrupt priority. */ | |
NVIC_SetPriority( ENET_IRQn, configMAC_INTERRUPT_PRIORITY ); | |
NVIC_EnableIRQ( ENET_IRQn ); | |
xReturn = pdPASS; | |
} | |
else | |
{ | |
xReturn = pdFAIL; | |
} | |
configASSERT( xStatus != ERROR ); | |
return xReturn; | |
} | |
/*-----------------------------------------------------------*/ | |
BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxNetworkBuffer ) | |
{ | |
BaseType_t xReturn = pdFAIL; | |
int32_t x; | |
extern void EMAC_StartTransmitNextBuffer( uint32_t ulLength ); | |
extern void EMAC_SetNextPacketToSend( uint8_t * pucBuffer ); | |
/* Attempt to obtain access to a Tx buffer. */ | |
for( x = 0; x < niMAX_TX_ATTEMPTS; x++ ) | |
{ | |
if( EMAC_CheckTransmitIndex() == TRUE ) | |
{ | |
/* Will the data fit in the Tx buffer? */ | |
if( pxNetworkBuffer->xDataLength < EMAC_ETH_MAX_FLEN ) /*_RB_ The size needs to come from FreeRTOSIPConfig.h. */ | |
{ | |
/* Assign the buffer to the Tx descriptor that is now known to | |
be free. */ | |
EMAC_SetNextPacketToSend( pxNetworkBuffer->pucBuffer ); | |
/* The EMAC now owns the buffer. */ | |
pxNetworkBuffer->pucBuffer = NULL; | |
/* Initiate the Tx. */ | |
EMAC_StartTransmitNextBuffer( pxNetworkBuffer->xDataLength ); | |
iptraceNETWORK_INTERFACE_TRANSMIT(); | |
/* The Tx has been initiated. */ | |
xReturn = pdPASS; | |
} | |
break; | |
} | |
else | |
{ | |
vTaskDelay( niTX_BUFFER_FREE_WAIT ); | |
} | |
} | |
/* Finished with the network buffer. */ | |
vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer ); | |
return xReturn; | |
} | |
/*-----------------------------------------------------------*/ | |
void ENET_IRQHandler( void ) | |
{ | |
uint32_t ulInterruptCause; | |
while( ( ulInterruptCause = LPC_EMAC->IntStatus ) != 0 ) | |
{ | |
/* Clear the interrupt. */ | |
LPC_EMAC->IntClear = ulInterruptCause; | |
/* Clear fatal error conditions. NOTE: The driver does not clear all | |
errors, only those actually experienced. For future reference, range | |
errors are not actually errors so can be ignored. */ | |
if( ( ulInterruptCause & EMAC_INT_TX_UNDERRUN ) != 0U ) | |
{ | |
LPC_EMAC->Command |= EMAC_CR_TX_RES; | |
} | |
/* Unblock the deferred interrupt handler task if the event was an | |
Rx. */ | |
if( ( ulInterruptCause & EMAC_INT_RX_DONE ) != 0UL ) | |
{ | |
xSemaphoreGiveFromISR( xEMACRxEventSemaphore, NULL ); | |
} | |
} | |
/* ulInterruptCause is used for convenience here. A context switch is | |
wanted, but coding portEND_SWITCHING_ISR( 1 ) would likely result in a | |
compiler warning. */ | |
portEND_SWITCHING_ISR( ulInterruptCause ); | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvEMACHandlerTask( void *pvParameters ) | |
{ | |
size_t xDataLength; | |
const uint16_t usCRCLength = 4; | |
NetworkBufferDescriptor_t *pxNetworkBuffer; | |
IPStackEvent_t xRxEvent = { eNetworkRxEvent, NULL }; | |
/* This is not included in the header file for some reason. */ | |
extern uint8_t *EMAC_NextPacketToRead( void ); | |
( void ) pvParameters; | |
configASSERT( xEMACRxEventSemaphore ); | |
for( ;; ) | |
{ | |
/* Wait for the EMAC interrupt to indicate that another packet has been | |
received. The while() loop is only needed if INCLUDE_vTaskSuspend is | |
set to 0 in FreeRTOSConfig.h. */ | |
while( xSemaphoreTake( xEMACRxEventSemaphore, portMAX_DELAY ) == pdFALSE ); | |
/* At least one packet has been received. */ | |
while( EMAC_CheckReceiveIndex() != FALSE ) | |
{ | |
/* Obtain the length, minus the CRC. The CRC is four bytes | |
but the length is already minus 1. */ | |
xDataLength = ( size_t ) EMAC_GetReceiveDataSize() - ( usCRCLength - 1U ); | |
if( xDataLength > 0U ) | |
{ | |
/* Obtain a network buffer to pass this data into the | |
stack. No storage is required as the network buffer | |
will point directly to the buffer that already holds | |
the received data. */ | |
pxNetworkBuffer = pxGetNetworkBufferWithDescriptor( 0, ( TickType_t ) 0 ); | |
if( pxNetworkBuffer != NULL ) | |
{ | |
pxNetworkBuffer->pucBuffer = EMAC_NextPacketToRead(); | |
pxNetworkBuffer->xDataLength = xDataLength; | |
xRxEvent.pvData = ( void * ) pxNetworkBuffer; | |
/* Data was received and stored. Send a message to the IP | |
task to let it know. */ | |
if( xSendEventStructToIPTask( &xRxEvent, ( TickType_t ) 0 ) == pdFAIL ) | |
{ | |
vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer ); | |
iptraceETHERNET_RX_EVENT_LOST(); | |
} | |
} | |
else | |
{ | |
iptraceETHERNET_RX_EVENT_LOST(); | |
} | |
iptraceNETWORK_INTERFACE_RECEIVE(); | |
} | |
/* Release the frame. */ | |
EMAC_UpdateRxConsumeIndex(); | |
} | |
} | |
} | |
/*-----------------------------------------------------------*/ | |