diff options
Diffstat (limited to 'FreeRTOS-Labs/Source/FreeRTOS-Plus-TCP/portable/NetworkInterface/LPC17xx/NetworkInterface.c')
| -rw-r--r-- | FreeRTOS-Labs/Source/FreeRTOS-Plus-TCP/portable/NetworkInterface/LPC17xx/NetworkInterface.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/FreeRTOS-Labs/Source/FreeRTOS-Plus-TCP/portable/NetworkInterface/LPC17xx/NetworkInterface.c b/FreeRTOS-Labs/Source/FreeRTOS-Plus-TCP/portable/NetworkInterface/LPC17xx/NetworkInterface.c new file mode 100644 index 000000000..e0d04e454 --- /dev/null +++ b/FreeRTOS-Labs/Source/FreeRTOS-Plus-TCP/portable/NetworkInterface/LPC17xx/NetworkInterface.c @@ -0,0 +1,267 @@ +/*
+FreeRTOS+TCP V2.0.11
+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://aws.amazon.com/freertos
+ http://www.FreeRTOS.org
+*/
+
+/* 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();
+ }
+ }
+}
+/*-----------------------------------------------------------*/
+
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