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Richard Barry 2012-08-11 21:34:11 +00:00
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FreeRTOS/Demo/lwIP_Demo_Rowley_ARM7/USB/USBIsr.c Normal file
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/*
FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
***************************************************************************
* *
* FreeRTOS tutorial books are available in pdf and paperback. *
* Complete, revised, and edited pdf reference manuals are also *
* available. *
* *
* Purchasing FreeRTOS documentation will not only help you, by *
* ensuring you get running as quickly as possible and with an *
* in-depth knowledge of how to use FreeRTOS, it will also help *
* the FreeRTOS project to continue with its mission of providing *
* professional grade, cross platform, de facto standard solutions *
* for microcontrollers - completely free of charge! *
* *
* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
* *
* Thank you for using FreeRTOS, and thank you for your support! *
* *
***************************************************************************
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
>>>NOTE<<< The modification to the GPL is included to allow you to
distribute a combined work that includes FreeRTOS without being obliged to
provide the source code for proprietary components outside of the FreeRTOS
kernel. FreeRTOS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details. You should have received a copy of the GNU General Public
License and the FreeRTOS license exception along with FreeRTOS; if not it
can be viewed here: http://www.freertos.org/a00114.html and also obtained
by writing to Richard Barry, contact details for whom are available on the
FreeRTOS WEB site.
1 tab == 4 spaces!
***************************************************************************
* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong? *
* *
* http://www.FreeRTOS.org/FAQHelp.html *
* *
***************************************************************************
http://www.FreeRTOS.org - Documentation, training, latest information,
license and contact details.
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool.
Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
the code with commercial support, indemnification, and middleware, under
the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
provide a safety engineered and independently SIL3 certified version under
the SafeRTOS brand: http://www.SafeRTOS.com.
*/
/*
BASIC INTERRUPT DRIVEN DRIVER FOR USB.
This file contains all the usb components that must be compiled
to ARM mode. The components that can be compiled to either ARM or THUMB
mode are contained in USB-CDC.c.
*/
/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
/* Demo application includes. */
#include "Board.h"
#include "usb.h"
#include "USB-CDC.h"
#define usbINT_CLEAR_MASK (AT91C_UDP_TXCOMP | AT91C_UDP_STALLSENT | AT91C_UDP_RXSETUP | AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1 )
/*-----------------------------------------------------------*/
/* Messages and queue used to communicate between the ISR and the USB task. */
static xISRStatus xISRMessages[ usbQUEUE_LENGTH + 1 ];
extern xQueueHandle xUSBInterruptQueue;
/*-----------------------------------------------------------*/
/* The ISR can cause a context switch so is declared naked. */
void vUSB_ISR_Wrapper( void ) __attribute__ ((naked));
/* The function that actually performs the ISR work. This must be separate
from the wrapper function to ensure the correct stack frame gets set up. */
void vUSB_ISR_Handler( void );
/*-----------------------------------------------------------*/
void vUSB_ISR_Handler( void )
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
static volatile unsigned long ulNextMessage = 0;
xISRStatus *pxMessage;
unsigned long ulRxBytes;
unsigned char ucFifoIndex;
/* Use the next message from the array. */
pxMessage = &( xISRMessages[ ( ulNextMessage & usbQUEUE_LENGTH ) ] );
ulNextMessage++;
/* Save UDP ISR state for task-level processing. */
pxMessage->ulISR = AT91C_BASE_UDP->UDP_ISR;
pxMessage->ulCSR0 = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
/* Clear interrupts from ICR. */
AT91C_BASE_UDP->UDP_ICR = AT91C_BASE_UDP->UDP_IMR | AT91C_UDP_ENDBUSRES;
/* Process incoming FIFO data. Must set DIR (if needed) and clear RXSETUP
before exit. */
/* Read CSR and get incoming byte count. */
ulRxBytes = ( pxMessage->ulCSR0 >> 16 ) & usbRX_COUNT_MASK;
/* Receive control transfers on endpoint 0. */
if( pxMessage->ulCSR0 & ( AT91C_UDP_RXSETUP | AT91C_UDP_RX_DATA_BK0 ) )
{
/* Save FIFO data buffer for either a SETUP or DATA stage */
for( ucFifoIndex = 0; ucFifoIndex < ulRxBytes; ucFifoIndex++ )
{
pxMessage->ucFifoData[ ucFifoIndex ] = AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_0 ];
}
/* Set direction for data stage. Must be done before RXSETUP is
cleared. */
if( ( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_RXSETUP ) )
{
if( ulRxBytes && ( pxMessage->ucFifoData[ usbREQUEST_TYPE_INDEX ] & 0x80 ) )
{
AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] |= AT91C_UDP_DIR;
/* Might not be wise in an ISR! */
while( !(AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_DIR) );
}
/* Clear RXSETUP */
AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] &= ~AT91C_UDP_RXSETUP;
/* Might not be wise in an ISR! */
while ( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_RXSETUP );
}
else
{
/* Clear RX_DATA_BK0 */
AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] &= ~AT91C_UDP_RX_DATA_BK0;
/* Might not be wise in an ISR! */
while ( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_RX_DATA_BK0 );
}
}
/* If we received data on endpoint 1, disable its interrupts until it is
processed in the main loop */
if( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] & ( AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1 ) )
{
AT91C_BASE_UDP->UDP_IDR = AT91C_UDP_EPINT1;
}
AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] &= ~( AT91C_UDP_TXCOMP | AT91C_UDP_STALLSENT );
/* Clear interrupts for the other endpoints, retain data flags for endpoint
1. */
AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] &= ~( AT91C_UDP_TXCOMP | AT91C_UDP_STALLSENT | AT91C_UDP_RXSETUP );
AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_2 ] &= ~usbINT_CLEAR_MASK;
AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_3 ] &= ~usbINT_CLEAR_MASK;
/* Post ISR data to queue for task-level processing */
xQueueSendFromISR( xUSBInterruptQueue, &pxMessage, &xHigherPriorityTaskWoken );
/* Clear AIC to complete ISR processing */
AT91C_BASE_AIC->AIC_EOICR = 0;
/* Do a task switch if needed */
if( xHigherPriorityTaskWoken )
{
/* This call will ensure that the unblocked task will be executed
immediately upon completion of the ISR if it has a priority higher
than the interrupted task. */
portYIELD_FROM_ISR();
}
}
/*-----------------------------------------------------------*/
void vUSB_ISR_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. */
vUSB_ISR_Handler();
/* Restore the context of whichever task will execute next. */
portRESTORE_CONTEXT();
}