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Diffstat (limited to 'Demo/ColdFire_MCF52259_CodeWarrior/FreeRTOS_Tick_Setup.c')
| -rw-r--r-- | Demo/ColdFire_MCF52259_CodeWarrior/FreeRTOS_Tick_Setup.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/Demo/ColdFire_MCF52259_CodeWarrior/FreeRTOS_Tick_Setup.c b/Demo/ColdFire_MCF52259_CodeWarrior/FreeRTOS_Tick_Setup.c new file mode 100644 index 00000000..188486cd --- /dev/null +++ b/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
+
+ 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 "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
+}
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