board.c

1 本程序为DSK板的初始化过程。 2.当DSP的主时钟频率为50MHz时

#include "type.h"
#include "board.h"
#include <stdio.h>
#include "timer.h"

//Tms320vc5402 have two timer--TIM0:timer0 TIM1:timer1
#define TIM0	0
#define TIM1	1

//define clkmd register initialize value
#define	PLL15	0x0e007
#define	PLL10	0x9007
#define PLL5	0x4007
#define PLL2	0x1007
#define PLL1	0x0f007
#define DIV2	0x0000
#define DIV4	0xf000

void set_clock(u16 plldiv);		//set system clock mode
void set_wait_states(void);		//set wait state register
void init_io_reg(void);			//initialize CPLD I/O control register

void board_led_toggle(BrdLed led);	//led toggle
void board_led_enable(BrdLed led);	//led enable
void board_led_disable(BrdLed led);	//led disable

void delay(int period);

void main()
{

	asm(" SSBX INTM ");		//disable all interrupt
	
	/*initialize 5402 dsk board*/
	set_clock(PLL10);		//clkout=10*10=100Mhz
	set_wait_states();
	init_io_reg();

	while(1)
	{
		board_led_enable(BRD_LED0);
		
		delay(1000);
		board_led_disable(BRD_LED0);
		board_led_enable(BRD_LED1);
		
		delay(1000);
		board_led_disable(BRD_LED1);
		board_led_enable(BRD_LED2);
		
		delay(1000);
		board_led_disable(BRD_LED2);
	}
	
}

//set clock generator mode
void set_clock(u16 plldiv)
{
	if (CLKMD&0x0001)	//if clock generator is PLL mode
	{
		if ((plldiv==DIV2)||(plldiv==DIV4))	//PLL mode to DIV mode
		{
			CLKMD=plldiv;
		}
		else							//PLL mode to PLL mode
		{
			CLKMD=DIV2;					//turn to DIV mode
			while (CLKMD&0x0001);		//check CLKMD PLL status bit
			CLKMD=plldiv|0x07f8;
			while (!(CLKMD&0x0001));	//check CLKMD PLL status bit
		}
	}
	else	//else clock generator is DIV mode
	{
		if ((plldiv==DIV2)||(plldiv==DIV4))	//DIV mode to DIV mode
		{
			CLKMD=PLL1|0x07f8;				//turn to PLL mode
			while(!(CLKMD&0x0001));			//check CLKMD PLL status bit
			CLKMD=plldiv;
		}
		else
		{
			CLKMD=plldiv|0x07f8;			//DIV mode to PLL mode
			while (!(CLKMD&0x0001));		//check CLKMD PLL status bit
		}
	}
}

void set_wait_states(void)
{
	SWWSR=0x0d844;
}
	
void init_io_reg(void)
{
	port0=0x10;
	port4=0x03;
	port2=0x00;
	port3=0x30;
	port5=0x00;
	port6=0x00;
}
	
void board_led_enable(BrdLed led)
{
	port0|=0x01<<led;
}

void board_led_disable(BrdLed led)
{
	port0&=~(0x01<<led);

}

void board_led_toggle(BrdLed led)
{
	port0^=(0x01<<led);
}

void delay(int period)
{
    int i, j;
    
    for(i=0; i<period; i++)
    {
        for(j=0; j<period>>1; j++);
    }
}