自学教程：C++ vApplicationSetupTimerInterrupt函数代码示例

portBASE_TYPE xPortStartScheduler( void ){extern void vApplicationSetupTimerInterrupt( void );	/* Use pxCurrentTCB just so it does not get optimised away. */	if( pxCurrentTCB != NULL )	{		/* Call an application function to set up the timer that will generate the		tick interrupt.  This way the application can decide which peripheral to 		use.  A demo application is provided to show a suitable example. */		vApplicationSetupTimerInterrupt();		/* Enable the software interrupt. */				_IEN( _ICU_SWINT ) = 1;				/* Ensure the software interrupt is clear. */		_IR( _ICU_SWINT ) = 0;				/* Ensure the software interrupt is set to the kernel priority. */		_IPR( _ICU_SWINT ) = configKERNEL_INTERRUPT_PRIORITY;			/* Start the first task. */		prvStartFirstTask();	}	/* Just to make sure the function is not optimised away. */	( void ) vSoftwareInterruptISR();	/* Should not get here. */	return pdFAIL;}

BaseType_t xPortStartScheduler( void ){extern void ( vPortStartFirstTask )( void );extern uint32_t _stack[];	/* Setup the hardware to generate the tick.  Interrupts are disabled when	this function is called.	This port uses an application defined callback function to install the tick	interrupt handler because the kernel will run on lots of different	MicroBlaze and FPGA configurations - not all of	which will have the same	timer peripherals defined or available.  An example definition of	vApplicationSetupTimerInterrupt() is provided in the official demo	application that accompanies this port. */	vApplicationSetupTimerInterrupt();	/* Reuse the stack from main() as the stack for the interrupts/exceptions. */	pulISRStack = ( uint32_t * ) _stack;	/* Ensure there is enough space for the functions called from the interrupt	service routines to write back into the stack frame of the caller. */	pulISRStack -= 2;	/* Restore the context of the first task that is going to run.  From here	on, the created tasks will be executing. */	vPortStartFirstTask();	/* Should not get here as the tasks are now running! */	return pdFALSE;}

portBASE_TYPE xPortStartScheduler( void ){extern void vApplicationSetupTimerInterrupt( void );	/* Call an application function to set up the timer that will generate the	tick interrupt.  This way the application can decide which peripheral to 	use.  A demo application is provided to show a suitable example. */	vApplicationSetupTimerInterrupt();	/* Start the first task.  This will only restore the standard registers and	not the flop registers.  This does not really matter though because the only	flop register that is initialised to a particular value is fpscr, and it is	only initialised to the current value, which will still be the current value	when the first task starts executing. */	trapa( portSTART_SCHEDULER_TRAP_NO );	/* Should not get here. */	return pdFAIL;}

/* * Hardware initialisation to generate the RTOS tick. */void vPortSetupTimerInterrupt( void ){	vApplicationSetupTimerInterrupt();}