Add MCF52259 demo.

Demo/ColdFire_MCF52259_CodeWarrior/FreeRTOS_Tick_Setup.c

@@ -0,0 +1,136 @@
+/*
+	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
+
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+	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.
+
+    ***************************************************************************
+    ***************************************************************************
+    *                                                                         *
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+    * and even write all or part of your application on your behalf.          *
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+    ***************************************************************************
+    ***************************************************************************
+
+	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.
+
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+	critical systems.
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+*/
+
+#include "FreeRTOS.h"
+#include "task.h"
+
+__declspec(interrupt:0) void vPIT0InterruptHandler( void );
+
+/* Constants used to configure the interrupts. */
+#define portPRESCALE_VALUE			64
+#define portPRESCALE_REG_SETTING	( 5 << 8 )
+#define portPIT_INTERRUPT_ENABLED	( 0x08 )
+#define configPIT0_INTERRUPT_VECTOR	( 55 )
+
+/*
+ * FreeRTOS.org requires two interrupts - a tick interrupt generated from a
+ * timer source, and a spare interrupt vector used for context switching.
+ * The configuration below uses PIT0 for the former, and vector 16 for the
+ * latter.  **IF YOUR APPLICATION HAS BOTH OF THESE INTERRUPTS FREE THEN YOU DO
+ * NOT NEED TO CHANGE ANY OF THIS CODE** - otherwise instructions are provided
+ * here for using alternative interrupt sources.
+ *
+ * To change the tick interrupt source:
+ *
+ *	1) Modify vApplicationSetupInterrupts() below to be correct for whichever
+ *	peripheral is to be used to generate the tick interrupt.  The name of the
+ *  handler function (currently vPIT0InterruptHandler()) should also be updated
+ *  to indicate which peripheral is generating the interrupt.
+ *
+ *	2) Make sure the interrupt source is cleared within the interrupt handler function.
+ *  Currently vPIT0InterruptHandler() clears the PIT0 interrupt.
+ *
+ *  3) Update the vector table within mcf5225x_vectors.s to install the tick
+ *  interrupt handler in the correct vector position.
+ *
+ * To change the spare interrupt source:
+ *
+ *  1) Modify vApplicationSetupInterrupts() below to be correct for whichever
+ *  interrupt vector is to be used.  Make sure you use a spare interrupt on interrupt
+ *  controller 0, otherwise the register used to request context switches will also
+ *  require modification.
+ *
+ *  2) Change the definition of configYIELD_INTERRUPT_VECTOR within FreeRTOSConfig.h
+ *  to be correct for your chosen interrupt vector.
+ *
+ *  3) Update the vector table within mcf5225x_vectors.s to install the handler
+ *  _vPortYieldISR() in the correct vector position (by default vector number 16 is
+ *  used).
+ */
+void vApplicationSetupInterrupts( void )
+{
+const unsigned portSHORT usCompareMatchValue = ( ( configCPU_CLOCK_HZ / portPRESCALE_VALUE ) / configTICK_RATE_HZ );
+
+    /* Configure interrupt priority and level and unmask interrupt for PIT0. */
+    MCF_INTC0_ICR55 = ( 1 | ( configKERNEL_INTERRUPT_PRIORITY << 3 ) );
+    MCF_INTC0_IMRH &= ~( MCF_INTC_IMRH_INT_MASK55 );
+
+    /* Do the same for vector 63 (interrupt controller 0.  I don't think the
+    write to MCF_INTC0_IMRH is actually required here but is included for
+    completeness. */
+    MCF_INTC0_ICR16 = ( 0 | configKERNEL_INTERRUPT_PRIORITY << 3 );
+    MCF_INTC0_IMRL &= ~( MCF_INTC_IMRL_INT_MASK16 | 0x01 );
+
+    /* Configure PIT0 to generate the RTOS tick. */
+    MCF_PIT0_PCSR |= MCF_PIT_PCSR_PIF;
+    MCF_PIT0_PCSR = ( portPRESCALE_REG_SETTING | MCF_PIT_PCSR_PIE | MCF_PIT_PCSR_RLD | MCF_PIT_PCSR_EN );
+	MCF_PIT0_PMR = usCompareMatchValue;
+}
+/*-----------------------------------------------------------*/
+
+__declspec(interrupt:0) void vPIT0InterruptHandler( void )
+{
+unsigned portLONG ulSavedInterruptMask;
+
+	/* Clear the PIT0 interrupt. */
+	MCF_PIT0_PCSR |= MCF_PIT_PCSR_PIF;
+
+	/* Increment the RTOS tick. */
+	ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();
+		vTaskIncrementTick();
+	portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );
+
+	/* If we are using the pre-emptive scheduler then also request a
+	context switch as incrementing the tick could have unblocked a task. */
+	#if configUSE_PREEMPTION == 1
+	{
+		taskYIELD();
+	}
+	#endif
+}