8led_test.c

适合LPC系列的ARM开发中的简单实例,请多多执教

#define	LPCEB2000_I
/*********************************************************************************************
* File：	8led_test.c
* Author:	Embest w.h.xie
* Desc：	8 segment led control and display
* History:	
*********************************************************************************************/

/*------------------------------------------------------------------------------------------*/
/*								include files												*/
/*------------------------------------------------------------------------------------------*/

#include   "target.h"

/*------------------------------------------------------------------------------------------*/
/*								local function declare										*/
/*------------------------------------------------------------------------------------------*/

void	irq_time0_svr(void);									// Timer0 interrupt
extern	void	irq_time0(void);								// extern Timer0 interrupt

/*------------------------------------------------------------------------------------------*/
/*	 							global variable define										*/
/*------------------------------------------------------------------------------------------*/

// led control variable
uint8   szLedChr[8], szLedIndex, szLedBase, szLedLast;

// led show variable 0-F
const   uint32 lLedDisp[16] = {	LED_CHAR_0, LED_CHAR_1, LED_CHAR_2, LED_CHAR_3,
								LED_CHAR_4, LED_CHAR_5, LED_CHAR_6, LED_CHAR_7,
								LED_CHAR_8, LED_CHAR_9, LED_CHAR_A, LED_CHAR_B,
								LED_CHAR_C, LED_CHAR_D, LED_CHAR_E, LED_CHAR_F }; 

uint8	szShowIndex, szPro;

/*********************************************************************************************
* name:		time_dly
* func:		display code
* para:		dly			--in, delay value
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  time_dly(uint32  dly)
{  
	uint32  i;

	for(; dly>0; dly--) 
		for(i=0; i<500; i++);
}

/*********************************************************************************************
* name:		led_init
* func:		init the led control port and init the display buffer
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  led_init(void)
{
	uint8   i;
	
	// choose led control port and data port set out
	IODIR0 |= LED_BIT_CON;
	IODIR0 |= LED_SEG_CON;
	IODIR0 |= LED_OUT_CON;
	IODIR0 |= LED_CON;

	IOCLR0 =  LED_BIT_CON | LED_SEG_CON | LED_CON;	

	// init Led value
	szLedLast  = 7;
	szLedBase  = 0;
	szLedIndex = 0;

	for (i=0; i<=szLedLast ; i++) {
		szLedChr[i] = i;
	}
}

/*********************************************************************************************
* name:		time0_init
* func:		init the Time0
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  time0_init(void)
{
	// init Timer0 register, 0.5ms timing
	TIMER0_PR  = 99;
	TIMER0_MCR = 0x03;
	TIMER0_MR0 = 250;
	TIMER0_TCR = 0x03;
	TIMER0_TCR = 0x01;

	// setup interrupt vector and allow timer interrupt
	VICVectCntl3 = 0x24;
	VICVectAddr3 = (uint32)irq_time0;
	VICIntEnable = 0x00000010;
}

/*********************************************************************************************
* name:		sys_init
* func:		init the sys
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  sys_init()
{
	// allow PLL
	PLLCON = 1;
	VPBDIV = PLL_VPBDIV;
	PLLCFG = PLL_CFG;

	PLLFEED = 0xaa;
	PLLFEED = 0x55;
	while((PLLSTAT & (1 << 10)) == 0);
	PLLCON = 3;
	PLLFEED = 0xaa;
	PLLFEED = 0x55;

	// set MAM 2 CCLK
	MAMCR   = 0;
	MAMTIM  = MAM_TIM;
	MAMCR   = 2;

	// init all interrupt
	VICIntEnClr = 0xffffffff;
	VICVectAddr = 0;
	VICIntSelect = 0;
}

/*********************************************************************************************
* name:		led_show
* func:		Led show out
* para:		szLedBit	--	in, Led show bit
*			szLedchar	--	in, Led show data
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void  led_show(uint32 szshowBit, uint32 szshowchar)
{
	// Led bit cortrol
	IOSET0 = LED_BIT_CON;
	IOSET0 = LED_OUT_CON;
	IOCLR0 = LED_BIT_CON;

	// Led segment cortrol
	IOSET0 = LED_SEG_CON;
	IOCLR0 = LED_OUT_CON;
	IOSET0 = szshowchar;
	IOCLR0 = LED_SEG_CON;

	// Led bit cortrol
	IOSET0 = LED_BIT_CON;
	IOSET0 = LED_OUT_CON;
	IOCLR0 = szshowBit;
	IOCLR0 = LED_BIT_CON;
}

/*********************************************************************************************
* name:		irq_time0_svr
* func:		Timer0 interrupt fun
* para:		none
* ret:		none
* modify:
* comment:	
*********************************************************************************************/
void irq_time0_svr(void)
{
	// count show Led bit
	szLedIndex += 1;
	if (szLedIndex > szLedLast)  szLedIndex = szLedBase;

	// refurbish show LED
	led_show((0x01 << szLedIndex+10), lLedDisp[szLedChr[szLedIndex]]);

	// interrupt fun finish
	TIMER0_IR   = 0x01;
	VICVectAddr = 0x00;
}

/*********************************************************************************************
* name:		Main
* func:		main fun
* para:		none
* ret:		none
* modify:
* comment:	
*********************************************************************************************/
int  Main(void)
{
	PINSEL0 = 0x00000000;
	PINSEL1 = 0x00000000;
	
	sys_init();
	   
	time0_init();
	
	led_init();
	
	szShowIndex = szLedBase;

	while(1);
}