Add PIC32 code.

Demo/PIC32MX_MPLAB/serial/serial.c

@@ -0,0 +1,190 @@
+/*
+	FreeRTOS.org V4.6.1 - Copyright (C) 2003-2007 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.
+
+	***************************************************************************
+	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.
+
+	Also see http://www.SafeRTOS.com a version that has been certified for use
+	in safety critical systems, plus commercial licensing, development and
+	support options.
+	***************************************************************************
+*/
+
+
+/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER. 
+
+NOTE:  This driver is primarily to test the scheduler functionality.  It does
+not effectively use the buffers or DMA and is therefore not intended to be
+an example of an efficient driver. */
+
+/* Standard include file. */
+#include <stdlib.h>
+#include <plib.h>
+
+/* Scheduler include files. */
+#include "FreeRTOS.h"
+#include "queue.h"
+#include "task.h"
+
+/* Demo app include files. */
+#include "serial.h"
+
+/* Hardware setup. */
+#define serSET_FLAG						( 1 )
+
+/* The queues used to communicate between tasks and ISR's. */
+static xQueueHandle xRxedChars; 
+static xQueueHandle xCharsForTx; 
+
+/* Flag used to indicate the tx status. */
+static portBASE_TYPE xTxHasEnded;
+
+/*-----------------------------------------------------------*/
+
+/* The UART interrupt handler. */
+void __attribute__( (interrupt(ipl1), vector(_UART2_VECTOR))) vU2InterruptWrapper( void );
+
+/*-----------------------------------------------------------*/
+
+xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
+{
+unsigned portSHORT usBRG;
+
+	/* Create the queues used by the com test task. */
+	xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
+	xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
+
+	/* Configure the UART and interrupts. */
+	usBRG = (unsigned portSHORT)(( (float)configPERIPHERAL_CLOCK_HZ / ( (float)16 * (float)ulWantedBaud ) ) - (float)0.5);
+	OpenUART2( UART_EN, UART_RX_ENABLE | UART_TX_ENABLE | UART_INT_TX | UART_INT_RX_CHAR, usBRG );
+	ConfigIntUART2( configKERNEL_INTERRUPT_PRIORITY | UART_INT_SUB_PR0 | UART_TX_INT_EN | UART_RX_INT_EN );
+
+	xTxHasEnded = pdTRUE;
+
+	/* Only a single port is implemented so we don't need to return anything. */
+	return NULL;
+}
+/*-----------------------------------------------------------*/
+
+signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
+{
+	/* Only one port is supported. */
+	( 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;
+	}
+}
+/*-----------------------------------------------------------*/
+
+signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
+{
+	/* Only one port is supported. */
+	( void ) pxPort;
+
+	/* Return false if after the block time there is no room on the Tx queue. */
+	if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
+	{
+		return pdFAIL;
+	}
+
+	/* A critical section should not be required as xTxHasEnded will not be
+	written to by the ISR if it is already 0 (is this correct?). */
+	if( xTxHasEnded )
+	{
+		xTxHasEnded = pdFALSE;
+		IFS1bits.U2TXIF = serSET_FLAG;
+	}
+
+	return pdPASS;
+}
+/*-----------------------------------------------------------*/
+
+void vSerialClose( xComPortHandle xPort )
+{
+}
+/*-----------------------------------------------------------*/
+
+void vU2InterruptHandler( void )
+{
+/* Declared static to minimise stack use. */
+static portCHAR cChar;
+static portBASE_TYPE xYieldRequired;
+
+	xYieldRequired = pdFALSE;
+
+	/* Are any Rx interrupts pending? */
+	if( mU2RXGetIntFlag() )
+	{
+		while( U2STAbits.URXDA )
+		{
+			/* Retrieve the received character and place it in the queue of
+			received characters. */
+			cChar = U2RXREG;
+			xYieldRequired = xQueueSendFromISR( xRxedChars, &cChar, xYieldRequired );
+		}
+		mU2RXClearIntFlag();
+	}
+
+	/* Are any Tx interrupts pending? */
+	if( mU2TXGetIntFlag() )
+	{
+		while( !( U2STAbits.UTXBF ) )
+		{
+			if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xYieldRequired ) == pdTRUE )
+			{
+				/* Send the next character queued for Tx. */
+				U2TXREG = cChar;
+			}
+			else
+			{
+				/* Queue empty, nothing to send. */
+				xTxHasEnded = pdTRUE;
+				break;
+			}
+		}
+
+		mU2TXClearIntFlag();
+	}
+
+	/* If sending or receiving necessitates a context switch, then switch now. */
+	portEND_SWITCHING_ISR( xYieldRequired );
+}
+
+
+
+
+
+
+

Demo/PIC32MX_MPLAB/serial/serial_isr.S

@@ -0,0 +1,24 @@
+#include <p32xxxx.h>
+#include <sys/asm.h>
+#include "ISR_Support.h"
+
+	.set	nomips16
+ 	.set 	noreorder
+ 	
+ 	.extern vU2InterruptHandler
+	.extern xISRStackTop
+ 	.global	vU2InterruptWrapper
+
+	.set		noreorder
+	.set 		noat
+	.ent		vU2InterruptWrapper
+
+vU2InterruptWrapper:
+
+	portSAVE_CONTEXT
+	jal vU2InterruptHandler
+	nop
+	portRESTORE_CONTEXT
+
+	.end		vU2InterruptWrapper
+