Add IAR MSP430 port layer.

git-svn-id: https://freertos.svn.sourceforge.net/svnroot/freertos/trunk@530 1d2547de-c912-0410-9cb9-b8ca96c0e9e2

4 files changed, 578 insertions, 0 deletions

diff --git a/Source/portable/IAR/MSP430/port.c b/Source/portable/IAR/MSP430/port.c
new file mode 100644
index 00000000..927c1e76
--- /dev/null
+++ b/Source/portable/IAR/MSP430/port.c
@@ -0,0 +1,195 @@
+/*

+	FreeRTOS.org V5.1.0 - Copyright (C) 2003-2008 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.

+

+    ***************************************************************************

+    ***************************************************************************

+    *                                                                         *

+    * SAVE TIME AND MONEY!  We can port FreeRTOS.org to your own hardware,    *

+    * and even write all or part of your application on your behalf.          *

+    * See http://www.OpenRTOS.com for details of the services we provide to   *

+    * expedite your project.                                                  *

+    *                                                                         *

+    ***************************************************************************

+    ***************************************************************************

+

+	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.

+*/

+

+/* Scheduler includes. */

+#include "FreeRTOS.h"

+#include "task.h"

+

+/*-----------------------------------------------------------

+ * Implementation of functions defined in portable.h for the MSP430 port.

+ *----------------------------------------------------------*/

+

+/* Constants required for hardware setup.  The tick ISR runs off the ACLK,

+not the MCLK. */

+#define portACLK_FREQUENCY_HZ			( ( portTickType ) 32768 )

+#define portINITIAL_CRITICAL_NESTING	( ( unsigned portSHORT ) 10 )

+#define portFLAGS_INT_ENABLED			( ( portSTACK_TYPE ) 0x08 )

+

+/* We require the address of the pxCurrentTCB variable, but don't want to know

+any details of its type. */

+typedef void tskTCB;

+extern volatile tskTCB * volatile pxCurrentTCB;

+

+/* Each task maintains a count of the critical section nesting depth.  Each

+time a critical section is entered the count is incremented.  Each time a

+critical section is exited the count is decremented - with interrupts only

+being re-enabled if the count is zero.

+

+usCriticalNesting will get set to zero when the scheduler starts, but must

+not be initialised to zero as this will cause problems during the startup

+sequence. */

+volatile unsigned portSHORT usCriticalNesting = portINITIAL_CRITICAL_NESTING;

+/*-----------------------------------------------------------*/

+

+

+/*

+ * Sets up the periodic ISR used for the RTOS tick.  This uses timer 0, but

+ * could have alternatively used the watchdog timer or timer 1.

+ */

+void vPortSetupTimerInterrupt( void );

+/*-----------------------------------------------------------*/

+

+/*

+ * Initialise the stack of a task to look exactly as if a call to

+ * portSAVE_CONTEXT had been called.

+ *

+ * See the header file portable.h.

+ */

+portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )

+{

+	/*

+		Place a few bytes of known values on the bottom of the stack.

+		This is just useful for debugging and can be included if required.

+

+		*pxTopOfStack = ( portSTACK_TYPE ) 0x1111;

+		pxTopOfStack--;

+		*pxTopOfStack = ( portSTACK_TYPE ) 0x2222;

+		pxTopOfStack--;

+		*pxTopOfStack = ( portSTACK_TYPE ) 0x3333;

+		pxTopOfStack--;

+	*/

+

+	/* The msp430 automatically pushes the PC then SR onto the stack before

+	executing an ISR.  We want the stack to look just as if this has happened

+	so place a pointer to the start of the task on the stack first - followed

+	by the flags we want the task to use when it starts up. */

+	*pxTopOfStack = ( portSTACK_TYPE ) pxCode;

+	pxTopOfStack--;

+	*pxTopOfStack = portFLAGS_INT_ENABLED;

+	pxTopOfStack--;

+

+	/* Next the general purpose registers. */

+	*pxTopOfStack = ( portSTACK_TYPE ) 0x4444;

+	pxTopOfStack--;

+	*pxTopOfStack = ( portSTACK_TYPE ) 0x5555;

+	pxTopOfStack--;

+	*pxTopOfStack = ( portSTACK_TYPE ) 0x6666;

+	pxTopOfStack--;

+	*pxTopOfStack = ( portSTACK_TYPE ) 0x7777;

+	pxTopOfStack--;

+	*pxTopOfStack = ( portSTACK_TYPE ) 0x8888;

+	pxTopOfStack--;

+	*pxTopOfStack = ( portSTACK_TYPE ) 0x9999;

+	pxTopOfStack--;

+	*pxTopOfStack = ( portSTACK_TYPE ) 0xaaaa;

+	pxTopOfStack--;

+	*pxTopOfStack = ( portSTACK_TYPE ) 0xbbbb;

+	pxTopOfStack--;	

+	

+	/* When the task starts is will expect to find the function parameter in

+	R15. */

+	*pxTopOfStack = ( portSTACK_TYPE ) pvParameters;

+	pxTopOfStack--;

+	

+	*pxTopOfStack = ( portSTACK_TYPE ) 0xdddd;

+	pxTopOfStack--;

+	*pxTopOfStack = ( portSTACK_TYPE ) 0xeeee;

+	pxTopOfStack--;

+	*pxTopOfStack = ( portSTACK_TYPE ) 0xffff;

+	pxTopOfStack--;

+

+	/* A variable is used to keep track of the critical section nesting.

+	This variable has to be stored as part of the task context and is

+	initially set to zero. */

+	*pxTopOfStack = ( portSTACK_TYPE ) portNO_CRITICAL_SECTION_NESTING;	

+

+	/* Return a pointer to the top of the stack we have generated so this can

+	be stored in the task control block for the task. */

+	return pxTopOfStack;

+}

+/*-----------------------------------------------------------*/

+

+void vPortEndScheduler( void )

+{

+	/* It is unlikely that the MSP430 port will get stopped.  If required simply

+	disable the tick interrupt here. */

+}

+/*-----------------------------------------------------------*/

+

+/*

+ * Hardware initialisation to generate the RTOS tick.  This uses timer 0

+ * but could alternatively use the watchdog timer or timer 1.

+ */

+void vPortSetupTimerInterrupt( void )

+{

+	/* Ensure the timer is stopped. */

+	TACTL = 0;

+

+	/* Run the timer of the ACLK. */

+	TACTL = TASSEL_1;

+

+	/* Clear everything to start with. */

+	TACTL |= TACLR;

+

+	/* Set the compare match value according to the tick rate we want. */

+	TACCR0 = portACLK_FREQUENCY_HZ / configTICK_RATE_HZ;

+

+	/* Enable the interrupts. */

+	TACCTL0 = CCIE;

+

+	/* Start up clean. */

+	TACTL |= TACLR;

+

+	/* Up mode. */

+	TACTL |= MC_1;

+}

+/*-----------------------------------------------------------*/

+

+

+	

diff --git a/Source/portable/IAR/MSP430/portasm.h b/Source/portable/IAR/MSP430/portasm.h
new file mode 100644
index 00000000..e3be90a3
--- /dev/null
+++ b/Source/portable/IAR/MSP430/portasm.h
@@ -0,0 +1,106 @@
+/*

+	FreeRTOS.org V5.1.0 - Copyright (C) 2003-2008 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.

+

+    ***************************************************************************

+    ***************************************************************************

+    *                                                                         *

+    * SAVE TIME AND MONEY!  We can port FreeRTOS.org to your own hardware,    *

+    * and even write all or part of your application on your behalf.          *

+    * See http://www.OpenRTOS.com for details of the services we provide to   *

+    * expedite your project.                                                  *

+    *                                                                         *

+    ***************************************************************************

+    ***************************************************************************

+

+	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.

+*/

+

+#ifndef PORTASM_H

+#define PORTASM_H

+

+portSAVE_CONTEXT macro

+

+		IMPORT pxCurrentTCB

+		IMPORT usCriticalNesting

+

+		/* Save the remaining registers. */

+		push	r4

+		push	r5

+		push	r6

+		push	r7

+		push	r8

+		push	r9

+		push	r10

+		push	r11

+		push	r12

+		push	r13

+		push	r14

+		push	r15

+		mov.w	&usCriticalNesting, r14

+		push	r14

+		mov.w	&pxCurrentTCB, r12

+		mov.w	r1, 0(r12)

+		endm

+/*-----------------------------------------------------------*/

+		

+portRESTORE_CONTEXT macro

+		mov.w	&pxCurrentTCB, r12

+		mov.w	@r12, r1

+		pop		r15

+		mov.w	r15, &usCriticalNesting

+		pop		r15

+		pop		r14

+		pop		r13

+		pop		r12

+		pop		r11

+		pop		r10

+		pop		r9

+		pop		r8

+		pop		r7

+		pop		r6

+		pop		r5

+		pop		r4

+

+		/* The last thing on the stack will be the status register.

+        Ensure the power down bits are clear ready for the next

+        time this power down register is popped from the stack. */

+		bic.w   #0xf0,0(SP)

+

+		reti

+		endm

+/*-----------------------------------------------------------*/

+

+#endif

+

diff --git a/Source/portable/IAR/MSP430/portext.s43 b/Source/portable/IAR/MSP430/portext.s43
new file mode 100644
index 00000000..7145b4f6
--- /dev/null
+++ b/Source/portable/IAR/MSP430/portext.s43
@@ -0,0 +1,128 @@
+/*

+	FreeRTOS.org V5.1.0 - Copyright (C) 2003-2008 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.

+

+    ***************************************************************************

+    ***************************************************************************

+    *                                                                         *

+    * SAVE TIME AND MONEY!  We can port FreeRTOS.org to your own hardware,    *

+    * and even write all or part of your application on your behalf.          *

+    * See http://www.OpenRTOS.com for details of the services we provide to   *

+    * expedite your project.                                                  *

+    *                                                                         *

+    ***************************************************************************

+    ***************************************************************************

+

+	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.

+*/

+#include "FreeRTOSConfig.h"

+#include "portasm.h"

+

+	IMPORT vTaskIncrementTick

+	IMPORT vTaskSwitchContext

+	IMPORT vPortSetupTimerInterrupt

+

+	EXPORT vTickISR

+	EXPORT vPortYield

+	EXPORT xPortStartScheduler

+	

+	RSEG CODE

+

+/*

+ * The RTOS tick ISR.

+ *

+ * If the cooperative scheduler is in use this simply increments the tick

+ * count.

+ *

+ * If the preemptive scheduler is in use a context switch can also occur.

+ */

+vTickISR:

+	portSAVE_CONTEXT

+				

+	call	#vTaskIncrementTick

+

+	#if configUSE_PREEMPTION == 1

+		call	#vTaskSwitchContext

+	#endif

+		

+	portRESTORE_CONTEXT

+/*-----------------------------------------------------------*/

+

+

+/*

+ * Manual context switch called by the portYIELD() macro.

+ */

+vPortYield:

+

+	/* Mimic an interrupt by pushing the SR. */

+	push	SR			

+

+	/* Now the SR is stacked we can disable interrupts. */

+	dint			

+				

+	/* Save the context of the current task. */

+	portSAVE_CONTEXT			

+

+	/* Switch to the highest priority task that is ready to run. */

+	call	#vTaskSwitchContext		

+

+	/* Restore the context of the new task. */

+	portRESTORE_CONTEXT

+/*-----------------------------------------------------------*/

+

+

+/*

+ * Start off the scheduler by initialising the RTOS tick timer, then restoring

+ * the context of the first task.

+ */

+xPortStartScheduler:

+

+	/* Setup the hardware to generate the tick.  Interrupts are disabled

+	when this function is called. */

+	call	#vPortSetupTimerInterrupt

+

+	/* Restore the context of the first task that is going to run. */

+	portRESTORE_CONTEXT

+/*-----------------------------------------------------------*/

+      		

+

+	/* Install vTickISR as the timer A0 interrupt. */

+	ASEG

+	ORG 0xFFE0 + TIMERA0_VECTOR

+	

+	_vTickISR_: DC16 vTickISR

+	

+

+	END

+		

diff --git a/Source/portable/IAR/MSP430/portmacro.h b/Source/portable/IAR/MSP430/portmacro.h
new file mode 100644
index 00000000..c8b7855d
--- /dev/null
+++ b/Source/portable/IAR/MSP430/portmacro.h
@@ -0,0 +1,149 @@
+/*

+	FreeRTOS.org V5.1.0 - Copyright (C) 2003-2008 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.

+

+    ***************************************************************************

+    ***************************************************************************

+    *                                                                         *

+    * SAVE TIME AND MONEY!  We can port FreeRTOS.org to your own hardware,    *

+    * and even write all or part of your application on your behalf.          *

+    * See http://www.OpenRTOS.com for details of the services we provide to   *

+    * expedite your project.                                                  *

+    *                                                                         *

+    ***************************************************************************

+    ***************************************************************************

+

+	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.

+*/

+

+#ifndef PORTMACRO_H

+#define PORTMACRO_H

+

+/*-----------------------------------------------------------

+ * Port specific definitions.

+ *

+ * The settings in this file configure FreeRTOS correctly for the

+ * given hardware and compiler.

+ *

+ * These settings should not be altered.

+ *-----------------------------------------------------------

+ */

+

+/* Type definitions. */

+#define portCHAR		char

+#define portFLOAT		float

+#define portDOUBLE		double

+#define portLONG		long

+#define portSHORT		int

+#define portSTACK_TYPE	unsigned portSHORT

+#define portBASE_TYPE	portSHORT

+

+#if( configUSE_16_BIT_TICKS == 1 )

+	typedef unsigned portSHORT portTickType;

+	#define portMAX_DELAY ( portTickType ) 0xffff

+#else

+	typedef unsigned portLONG portTickType;

+	#define portMAX_DELAY ( portTickType ) 0xffffffff

+#endif

+

+/*-----------------------------------------------------------*/	

+

+/* Interrupt control macros. */

+#define portDISABLE_INTERRUPTS()	_DINT();

+#define portENABLE_INTERRUPTS()		_EINT();

+/*-----------------------------------------------------------*/

+

+/* Critical section control macros. */

+#define portNO_CRITICAL_SECTION_NESTING		( ( unsigned portSHORT ) 0 )

+

+#define portENTER_CRITICAL()													\

+{																				\

+extern volatile unsigned portSHORT usCriticalNesting;							\

+																				\

+	portDISABLE_INTERRUPTS();													\

+																				\

+	/* Now interrupts are disabled usCriticalNesting can be accessed */			\

+	/* directly.  Increment ulCriticalNesting to keep a count of how many */	\

+	/* times portENTER_CRITICAL() has been called. */							\

+	usCriticalNesting++;														\

+}

+

+#define portEXIT_CRITICAL()														\

+{																				\

+extern volatile unsigned portSHORT usCriticalNesting;							\

+																				\

+	if( usCriticalNesting > portNO_CRITICAL_SECTION_NESTING )					\

+	{																			\

+		/* Decrement the nesting count as we are leaving a critical section. */	\

+		usCriticalNesting--;													\

+																				\

+		/* If the nesting level has reached zero then interrupts should be */	\

+		/* re-enabled. */														\

+		if( usCriticalNesting == portNO_CRITICAL_SECTION_NESTING )				\

+		{																		\

+			portENABLE_INTERRUPTS();											\

+		}																		\

+	}																			\

+}

+/*-----------------------------------------------------------*/

+

+/* Task utilities. */

+

+/*

+ * Manual context switch called by portYIELD or taskYIELD.

+ */

+extern void vPortYield( void );

+#define portYIELD() vPortYield()

+/*-----------------------------------------------------------*/

+

+/* Hardware specifics. */

+#define portBYTE_ALIGNMENT			2

+#define portSTACK_GROWTH			( -1 )

+#define portTICK_RATE_MS			( ( portTickType ) 1000 / configTICK_RATE_HZ )	

+#define portNOP()	

+/*-----------------------------------------------------------*/

+

+/* Task function macros as described on the FreeRTOS.org WEB site. */

+#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )

+#define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )

+

+#if configINTERRUPT_EXAMPLE_METHOD == 2

+

+extern void vTaskSwitchContext( void );

+#define portYIELD_FROM_ISR( x ) if( x ) vTaskSwitchContext()

+

+#endif

+

+#endif /* PORTMACRO_H */

+