main.c

bf537 CAN接口测试程序

/*****************************************************************************
**																			**
**	Name:		main.c														**
**																			**
**	Comments:	This routine is the CAN Receiver sample code, intended to	**
**				be used for CAN hardware test purposes and to show how to	**
**				perform simple transmit/receive functionality over CAN.		**
**				RX board executes a scrolling right LED by default, but		**
**				will change the display based on commands coming over CAN,	**
**				causing software flags to be set and cleared.				**
**																			** 
*****************************************************************************/

#include "CAN_RX.h"

/* Global Data																*/
char  blink = 0;	/* Display Select 		(1=blink,   0=scroll)			*/
char  scroll = 0;	/* LED Scroll Direction (1=left,    0=right)			*/
char  change = 0;	/* Change Display Flag	(1=Changed, 0=Same)				*/
char  off = 0;		/* Clear Display		(1=Clear,   0=Not)				*/
short display;		/* LED Display Value									*/

volatile unsigned int delay = 0x400000;	/* Delay Value for Blink Rate		*/

main()
{
	Init_PLL();					/* Set PLL									*/
	Init_Port();				/* Initialize Ports							*/
	Init_Interrupts();			/* Initialize Interrupts					*/
	Init_CAN_Timing();			/* Setup CAN Timing							*/
	Init_CAN_Mailboxes();		/* Initialize CAN Mailbox Area				*/

	CAN_Setup_Interrupts();		/* Configure CAN Mailbox Interrupts			*/
	CAN_Enable();				/* Enable CAN								*/

	/* Initial Setting Is Scroll Right										*/
	display = 0x0800;			/* Light Only LED6							*/
	
	while(1)					/* wait for IRQs							*/
	{
		*pPORTFIO = display;	/* write display							*/

		while(delay--);			/* wait										*/

		delay = 0x400000;		/* reset delay								*/
		
		if (off)				/* if OFF flag is set						*/
			display = 0x0000;	/* turn LEDs Off							*/

		else if (blink)			/* else if blink flag is set				*/
			display = ~display;	/* toggle display							*/
		
		else					/* else it is scrolling						*/
		{
			if (change)			/* if mode changed to scroll				*/
			{					/* we must initialize LED position			*/
				if (scroll)				/* if scrolling left				*/
					display = 0x0020;	/* initialize position far right	*/
				else					/* otherwise scrolling right		*/
					display = 0x1000;	/* initialize position far left		*/
				
				change=0;		/* clear CHANGE flag						*/
			}
			
			if (scroll)			/* if scrolling left						*/
			{
				if ((display <<= 1) == 0x1000)	/* scroll/check overflow	*/
					display = 0x0040;			/* reset to rightmost LED	*/
			}
			else				/* otherwise scrolling right				*/
			{
				if ((display >>= 1) == 0x0020)	/* scroll/check overflow	*/
					display = 0x0800;			/* reset to leftmost LED	*/
			}
		}				
	} /* end while forever													*/
} /* end main																*/