board.c

一个小型的嵌入式操作系统内核,可用于多种硬件平台

/**************************************************************************************************
                                      EDL RTOS Kernel
                              (c) Copyright 2005, Wu Jun
                                    All Rights Reserved    
                For further information, please visit http://www.enjoydigitallife.com

* Description:      None
* History:          
    Date                         Remarks
    2005-01-06                   Created initial version
    2005-12-12                   Finished the version 2.01
**************************************************************************************************/

#include "LPC2294.h"
#include "board.h"
#include "datatype.h"
#include "timer.h"
#include "serial.h"  
#include "led.h"       
#include "system.h" 









/**************************************************************************************************
* Description: timer interrupt service routine
**************************************************************************************************/
void tm_isr(void)
{  
    U32 cpu_flags = sys_disableInterrupt();

    T0IR = 0x01;
    VICVectAddr = 0x00;	

    sys_restoreCpuFlags( cpu_flags );

    tm_tick();
}

/**************************************************************************************************
* Description: timer low level initializing
**************************************************************************************************/
void tm_init(void)
{
   
    T0TC = 0;
	T0PR = 0;			    					
	T0MCR = 0x03;
	T0MR0 = 11059200 / TICKS_PER_SECOND;
	T0TCR = 0x03;		
	T0TCR = 0x01; 
	
	VICVectCntl0 = ( 0x20 | 4 );
	VICVectAddr0 = (U32)tm_isr; 
	VICIntEnable = (U32)( 1 << 4 );

}

/**************************************************************************************************
* Description: initialize board
**************************************************************************************************/
void bd_initBoard( void )
{

    /* configure pin function of ARM */
    PINSEL2 =  0x0f814914;

    /* configure bank */
    BCFG0 =  0x1000ffef;
    BCFG1 =  0x1000ffef;
    
    /* configure PLL,VPB */    
    PLLCON = 1;
#if (Fpclk / (Fcclk / 4)) == 1
    VPBDIV = 0;
#endif
#if (Fpclk / (Fcclk / 4)) == 2
    VPBDIV = 2;
#endif
#if (Fpclk / (Fcclk / 4)) == 4
    VPBDIV = 1;
#endif

#if (Fcco / Fcclk) == 2
    PLLCFG = ((Fcclk / Fosc) - 1) | (0 << 5);
#endif
#if (Fcco / Fcclk) == 4
    PLLCFG = ((Fcclk / Fosc) - 1) | (1 << 5);
#endif
#if (Fcco / Fcclk) == 8
    PLLCFG = ((Fcclk / Fosc) - 1) | (2 << 5);
#endif
#if (Fcco / Fcclk) == 16
    PLLCFG = ((Fcclk / Fosc) - 1) | (3 << 5);
#endif
    PLLFEED = 0xaa;
    PLLFEED = 0x55;
    while((PLLSTAT & (1 << 10)) == 0);
    PLLCON = 3;
    PLLFEED = 0xaa;
    PLLFEED = 0x55;        
    
    /* initialize interrupt vectors */
    VICIntEnClr = 0xffffffff;
    VICVectAddr = 0;
    VICIntSelect = 0;    

    led_init();
  
    uart0_init(2400);    

    tm_init();          /* Initialize and enable timer interrupt */
}