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authorRichardBarry <RichardBarry@1d2547de-c912-0410-9cb9-b8ca96c0e9e2>2009-02-09 20:03:16 +0000
committerRichardBarry <RichardBarry@1d2547de-c912-0410-9cb9-b8ca96c0e9e2>2009-02-09 20:03:16 +0000
commit5c2a7714b78d121630d33c25309adbe8e305ec0c (patch)
treea2a3f8dde03194f89af2edb441e869ae7dcba961
parentcc0241d408081bb30e5f8ae6d628aa7c1e92af5a (diff)
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Add comtest tasks to the AT91SAM9XE demo.
git-svn-id: https://freertos.svn.sourceforge.net/svnroot/freertos/trunk@694 1d2547de-c912-0410-9cb9-b8ca96c0e9e2
-rw-r--r--Demo/ARM9_AT91SAM9XE_IAR/serial/serial.c267
1 files changed, 267 insertions, 0 deletions
diff --git a/Demo/ARM9_AT91SAM9XE_IAR/serial/serial.c b/Demo/ARM9_AT91SAM9XE_IAR/serial/serial.c
new file mode 100644
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--- /dev/null
+++ b/Demo/ARM9_AT91SAM9XE_IAR/serial/serial.c
@@ -0,0 +1,267 @@
+/*
+ FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 Richard Barry.
+
+ This file is part of the FreeRTOS.org distribution.
+
+ FreeRTOS.org is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ FreeRTOS.org 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
+ along with FreeRTOS.org; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ A special exception to the GPL can be applied should you wish to distribute
+ a combined work that includes FreeRTOS.org, without being obliged to provide
+ the source code for any proprietary components. See the licensing section
+ of http://www.FreeRTOS.org for full details of how and when the exception
+ can be applied.
+
+ ***************************************************************************
+ ***************************************************************************
+ * *
+ * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
+ * *
+ * This is a concise, step by step, 'hands on' guide that describes both *
+ * general multitasking concepts and FreeRTOS specifics. It presents and *
+ * explains numerous examples that are written using the FreeRTOS API. *
+ * Full source code for all the examples is provided in an accompanying *
+ * .zip file. *
+ * *
+ ***************************************************************************
+ ***************************************************************************
+
+ Please ensure to read the configuration and relevant port sections of the
+ online documentation.
+
+ http://www.FreeRTOS.org - Documentation, latest information, license and
+ contact details.
+
+ http://www.SafeRTOS.com - A version that is certified for use in safety
+ critical systems.
+
+ http://www.OpenRTOS.com - Commercial support, development, porting,
+ licensing and training services.
+*/
+
+/*
+ BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
+*/
+
+/* Standard includes. */
+#include <stdlib.h>
+
+/* Scheduler includes. */
+#include "FreeRTOS.h"
+#include "queue.h"
+
+/* Demo application includes. */
+#include "serial.h"
+
+/* Atmel library includes. */
+#include <usart/usart.h>
+#include <aic/aic.h>
+#include <pmc/pmc.h>
+
+/*-----------------------------------------------------------*/
+
+/* Location of the COM0 registers. */
+#define serCOM0 ( ( AT91PS_USART ) AT91C_BASE_US0 )
+
+/* Interrupt control macros. */
+#define serINTERRUPT_LEVEL ( 5 )
+#define vInterruptOn() serCOM0->US_IER = ( AT91C_US_TXRDY | AT91C_US_RXRDY )
+#define vInterruptOff() serCOM0->US_IDR = AT91C_US_TXRDY
+
+/* Misc constants. */
+#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
+#define serHANDLE ( ( xComPortHandle ) 1 )
+#define serNO_BLOCK ( ( portTickType ) 0 )
+#define serNO_TIMEGUARD ( ( unsigned portLONG ) 0 )
+#define serNO_PERIPHERAL_B_SETUP ( ( unsigned portLONG ) 0 )
+
+
+/* Queues used to hold received characters, and characters waiting to be
+transmitted. */
+static xQueueHandle xRxedChars;
+static xQueueHandle xCharsForTx;
+
+/*-----------------------------------------------------------*/
+
+/* The interrupt service routine. */
+__arm void vSerialISR( void );
+
+/*-----------------------------------------------------------*/
+
+/*
+ * See the serial2.h header file.
+ */
+xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
+{
+xComPortHandle xReturn = serHANDLE;
+
+ /* Create the queues used to hold Rx and Tx characters. */
+ xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
+ xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
+
+ /* If the queues were created correctly then setup the serial port
+ hardware. */
+ if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
+ {
+ PMC_EnablePeripheral( AT91C_ID_US0 );
+ portENTER_CRITICAL();
+ {
+ USART_Configure( serCOM0, ( AT91C_US_CHRL_8_BITS | AT91C_US_PAR_NONE ), ulWantedBaud, configCPU_CLOCK_HZ );
+
+ /* Enable Rx and Tx. */
+ USART_SetTransmitterEnabled( serCOM0, pdTRUE );
+ USART_SetReceiverEnabled( serCOM0, pdTRUE );
+
+ /* Enable the Rx interrupts. The Tx interrupts are not enabled
+ until there are characters to be transmitted. */
+ serCOM0->US_IER = AT91C_US_RXRDY;
+
+ /* Enable the interrupts in the AIC. */
+ AIC_ConfigureIT( AT91C_ID_US0, AT91C_AIC_PRIOR_LOWEST, ( void (*)( void ) ) vSerialISR );
+ AIC_EnableIT( AT91C_ID_US0 );
+ }
+ portEXIT_CRITICAL();
+ }
+ else
+ {
+ xReturn = ( xComPortHandle ) 0;
+ }
+
+ /* This demo file only supports a single port but we have to return
+ something to comply with the standard demo header file. */
+ return xReturn;
+}
+/*-----------------------------------------------------------*/
+
+signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
+{
+ /* The port handle is not required as this driver only supports one port. */
+ ( void ) pxPort;
+
+ /* Get the next character from the buffer. Return false if no characters
+ are available, or arrive before xBlockTime expires. */
+ if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
+ {
+ return pdTRUE;
+ }
+ else
+ {
+ return pdFALSE;
+ }
+}
+/*-----------------------------------------------------------*/
+
+void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
+{
+signed portCHAR *pxNext;
+
+ /* A couple of parameters that this port does not use. */
+ ( void ) usStringLength;
+ ( void ) pxPort;
+
+ /* NOTE: This implementation does not handle the queue being full as no
+ block time is used! */
+
+ /* The port handle is not required as this driver only supports UART0. */
+ ( void ) pxPort;
+
+ /* Send each character in the string, one at a time. */
+ pxNext = ( signed portCHAR * ) pcString;
+ while( *pxNext )
+ {
+ xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
+ pxNext++;
+ }
+}
+/*-----------------------------------------------------------*/
+
+signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
+{
+ /* Just to remove compiler warning. */
+ ( void ) pxPort;
+
+ /* Place the character in the queue of characters to be transmitted. */
+ if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
+ {
+ return pdFAIL;
+ }
+
+ /* Turn on the Tx interrupt so the ISR will remove the character from the
+ queue and send it. This does not need to be in a critical section as
+ if the interrupt has already removed the character the next interrupt
+ will simply turn off the Tx interrupt again. */
+ vInterruptOn();
+
+ return pdPASS;
+}
+/*-----------------------------------------------------------*/
+
+void vSerialClose( xComPortHandle xPort )
+{
+ /* Not supported as not required by the demo application. */
+ ( void ) xPort;
+}
+/*-----------------------------------------------------------*/
+
+/* Serial port ISR. This can cause a context switch so is not defined as a
+standard ISR using the __irq keyword. Instead a wrapper function is defined
+within serialISR.s79 which in turn calls this function. See the port
+documentation on the FreeRTOS.org website for more information. */
+__arm void vSerialISR( void )
+{
+unsigned portLONG ulStatus;
+signed portCHAR cChar;
+portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
+
+ /* What caused the interrupt? */
+ ulStatus = serCOM0->US_CSR &= serCOM0->US_IMR;
+
+ if( ulStatus & AT91C_US_TXRDY )
+ {
+ /* The interrupt was caused by the THR becoming empty. Are there any
+ more characters to transmit? */
+ if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
+ {
+ /* A character was retrieved from the queue so can be sent to the
+ THR now. */
+ serCOM0->US_THR = cChar;
+ }
+ else
+ {
+ /* Queue empty, nothing to send so turn off the Tx interrupt. */
+ vInterruptOff();
+ }
+ }
+
+ if( ulStatus & AT91C_US_RXRDY )
+ {
+ /* The interrupt was caused by a character being received. Grab the
+ character from the RHR and place it in the queue or received
+ characters. */
+ cChar = serCOM0->US_RHR;
+ xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
+ }
+
+ /* If a task was woken by either a character being received or a character
+ being transmitted then we may need to switch to another task. */
+ portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
+
+ /* End the interrupt in the AIC. */
+ AT91C_BASE_AIC->AIC_EOICR = 0;
+}
+
+
+
+
+