First version under SVN is V4.0.1

2025-09-01 11:53:53 -04:00 · 2006-05-02 09:39:15 +00:00 · 2006-05-02 09:39:15 +00:00 · b6df57c7e3
commit b6df57c7e3
parent 243393860c
918 changed files with 269038 additions and 0 deletions
--- a/Demo/ARM7_AT91FR40008_GCC/serial/serialISR.c
+++ b/Demo/ARM7_AT91FR40008_GCC/serial/serialISR.c
@ -0,0 +1,144 @@
+/*
+  FreeRTOS V4.0.1 - Copyright (C) 2003-2006 Richard Barry.
+
+  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 as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  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
+  along with FreeRTOS; 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, 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.
+
+  ***************************************************************************
+  See http://www.FreeRTOS.org for documentation, latest information, license 
+  and contact details.  Please ensure to read the configuration and relevant 
+  port sections of the online documentation.
+  ***************************************************************************
+*/
+
+
+/* 
+  BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR USART0. 
+
+  This file contains all the serial port components that must be compiled
+  to ARM mode.  The components that can be compiled to either ARM or THUMB
+  mode are contained in serial.c.
+
+*/
+
+/* Standard includes. */
+#include <stdlib.h>
+
+/* Scheduler includes. */
+#include "FreeRTOS.h"
+#include "queue.h"
+#include "task.h"
+
+/* Demo application includes. */
+#include "serial.h"
+#include "AT91R40008.h"
+#include "usart.h"
+
+/*-----------------------------------------------------------*/
+
+/* Constant to access the AIC. */
+#define serCLEAR_AIC_INTERRUPT      ( ( unsigned portLONG ) 0 )
+
+/* Constants to determine the ISR source. */
+#define serSOURCE_THRE				( ( unsigned portCHAR ) 0x02 )
+#define serSOURCE_RX_TIMEOUT		( ( unsigned portCHAR ) 0x0c )
+#define serSOURCE_ERROR				( ( unsigned portCHAR ) 0x06 )
+#define serSOURCE_RX				( ( unsigned portCHAR ) 0x04 )
+#define serINTERRUPT_SOURCE_MASK    ( ( unsigned portLONG ) (US_RXRDY | US_TXRDY | US_RXBRK | US_OVRE | US_FRAME | US_PARE) )
+
+/* Queues used to hold received characters, and characters waiting to be
+transmitted. */
+static xQueueHandle xRxedChars; 
+static xQueueHandle xCharsForTx; 
+
+/*-----------------------------------------------------------*/
+
+/* UART0 interrupt service routine.  This can cause a context switch so MUST
+be declared "naked". */
+void vUART_ISR( void ) __attribute__ ((naked));
+
+/*-----------------------------------------------------------*/
+void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, xQueueHandle *pxRxedChars, xQueueHandle *pxCharsForTx )
+{
+	/* 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 ) );
+
+	/* Pass back a reference to the queues so the serial API file can 
+	post/receive characters. */
+	*pxRxedChars = xRxedChars;
+	*pxCharsForTx = xCharsForTx;
+}
+/*-----------------------------------------------------------*/
+
+void vUART_ISR( void )
+{
+	/* This ISR can cause a context switch, so the first statement must be a
+	call to the portENTER_SWITCHING_ISR() macro.  This must be BEFORE any
+	variable declarations. */
+	portENTER_SWITCHING_ISR();
+
+	/* Now we can declare the local variables. */
+	signed portCHAR cChar;
+	portBASE_TYPE xTaskWokenByTx = pdFALSE, xTaskWokenByRx = pdFALSE;
+	unsigned portLONG ulStatus;
+
+	/* What caused the interrupt? */
+	ulStatus = AT91C_BASE_US0->US_CSR & AT91C_BASE_US0->US_IMR;
+
+	if (ulStatus & US_TXRDY)
+	{
+		/* The interrupt was caused by the THR becoming empty.  Are there any
+		more characters to transmit? */
+		if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xTaskWokenByTx ) == pdTRUE )
+		{
+			/* A character was retrieved from the queue so can be sent to the
+			THR now. */
+			AT91C_BASE_US0->US_THR = cChar;
+		}
+		else
+		{
+			/* Queue empty, nothing to send so turn off the Tx interrupt. */
+			AT91C_BASE_US0->US_IDR = US_TXRDY;
+		}    
+	}
+
+	if (ulStatus & US_RXRDY)
+	{
+		/* The interrupt was caused by the receiver getting data. */
+		cChar = AT91C_BASE_US0->US_RHR;
+
+		if (xQueueSendFromISR(xRxedChars, &cChar, pdFALSE))
+		{
+			xTaskWokenByRx = pdTRUE;
+		}
+	}
+
+	// Acknowledge the interrupt at AIC level...
+	AT91C_BASE_AIC->AIC_EOICR = serCLEAR_AIC_INTERRUPT;
+
+	/* Exit the ISR.  If a task was woken by either a character being received
+	or transmitted then a context switch will occur. */
+	portEXIT_SWITCHING_ISR( ( xTaskWokenByTx || xTaskWokenByRx ) );
+}
+/*-----------------------------------------------------------*/
+