pwmdac_test.c

LPCEB2000-S单片机PWM-DAC控制程序

#define	LPCEB2000_I

/*********************************************************************************************
* File：	pwmdac_test.c
* Author:	Embest w.h.xie
* Desc：	test pwmdac
* History:	
*********************************************************************************************/

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

#include	"target.h"


/*********************************************************************************************
* 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:		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:		pwm_Init
* func:		init the pwm
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void pwm_init(void)
{
    PWM_PR  = 100;												// 100 PR
    PWM_MCR = 0x02;												// PWM2 match
    PWM_MR0 = 100;												// set PWM0 register
    PWM_MR5 = 50;												// set PWM5 register
    PWM_LER = 0x21;												// PWM0 and PWM5 read-in
    PWM_PCR = 0x2000;											// set PWMENA5 bit
    PWM_TCR = 0x09;												// start PWM
}

/*********************************************************************************************
* name:		Main
* func:		main fun
* para:		none
* ret:		none
* modify:
* comment:	
*********************************************************************************************/
int  main(void)
{
	uint8   i ,j;

	// init GPIO
	PINSEL0 = 0x00000000;
	PINSEL1 = 0x00000400;

	sys_init();
	pwm_init();

	do{
		for (i=0; i<200 ; i++) {
			j = i;
			if (i>100) j = 200 - i;
			PWM_MR0 = 100;
			PWM_MR5 = j;										// set PWM5 register
			PWM_LER = 0x21;										// PWM0 and PWM5 read-in
			time_dly(20);
		}
	} while(1);
}