target.c

通过IAR编译的LPC系列处理器CAN总线模块的使用方法

/*****************************************************************************
 *   target.c:  Target C file for NXP LPC24xx Family Microprocessors
 *
 *   Copyright(C) 2006, NXP Semiconductor
 *   All rights reserved.
 *
 *   History
 *   2006.07.13  ver 1.00    Prelimnary version, first Release
 *
*****************************************************************************/
#include "LPC2468.h"
#include "type.h"
#include "irq.h"
#include "target.h"


/******************************************************************************
** Function name:		GPIOResetInit
**
** Descriptions:		Initialize the target board before running the main()
**				function; User may change it as needed, but may not
**				deleted it.
**
** parameters:			None
** Returned value:		None
**
******************************************************************************/
void GPIOResetInit( void )
{
	/* Reset all GPIO pins to default: primary function */
    PINSEL0 = 0x00000000;
    PINSEL1 = 0x00000000;
    PINSEL2 = 0x00000000;
    PINSEL3 = 0x00000000;
    PINSEL4 = 0x00000000;
    PINSEL5 = 0x00000000;
    PINSEL6 = 0x00000000;
    PINSEL7 = 0x00000000;
    PINSEL8 = 0x00000000;
    PINSEL9 = 0x00000000;
    PINSEL10 = 0x00000000;

    IODIR0 = 0x00000000;
    IODIR1 = 0x00000000;
    IOSET0 = 0x00000000;
    IOSET1 = 0x00000000;

    FIO0DIR = 0x00000000;
    FIO1DIR = 0x00000000;
    FIO2DIR = 0x00000000;
    FIO3DIR = 0x00000000;
    FIO4DIR = 0x00000000;

    FIO0SET = 0x00000000;
    FIO1SET = 0x00000000;
    FIO2SET = 0x00000000;
    FIO3SET = 0x00000000;
    FIO4SET = 0x00000000;
    return;
}

/******************************************************************************
** Function name:		ConfigurePLL
**
** Descriptions:		Configure PLL switching to main OSC instead of IRC
**						at power up and wake up from power down.
**						This routine is used in TargetResetInit() and those
**						examples using power down and wake up such as
**						USB suspend to resume, ethernet WOL, and power management
**						example
** parameters:			None
** Returned value:		None
**
******************************************************************************/
void ConfigurePLL ( void )
{
	DWORD MValue, NValue;

	if ( PLLSTAT & (1 << 25) )
    {
		PLLCON = 1;			/* Enable PLL, disconnected */
		PLLFEED = 0xaa;
		PLLFEED = 0x55;
    }

    PLLCON = 0;				/* Disable PLL, disconnected */
    PLLFEED = 0xaa;
    PLLFEED = 0x55;

	SCS |= 0x20;			/* Enable main OSC */
    while( !(SCS & 0x40) );	/* Wait until main OSC is usable */

    CLKSRCSEL = 0x1;		/* select main OSC, 12MHz, as the PLL clock source */

    PLLCFG = PLL_MValue | (PLL_NValue << 16);
    PLLFEED = 0xaa;
    PLLFEED = 0x55;

    PLLCON = 1;				/* Enable PLL, disconnected */
    PLLFEED = 0xaa;
    PLLFEED = 0x55;

    CCLKCFG = CCLKDivValue;	/* Set clock divider */
#if USE_USB
    USBCLKCFG = USBCLKDivValue;		/* usbclk = 288 MHz/6 = 48 MHz */
#endif

    while ( ((PLLSTAT & (1 << 26)) == 0) );	/* Check lock bit status */

    MValue = PLLSTAT & 0x00007FFF;
    NValue = (PLLSTAT & 0x00FF0000) >> 16;
    while ((MValue != PLL_MValue) && ( NValue != PLL_NValue) );

    PLLCON = 3;				/* enable and connect */
    PLLFEED = 0xaa;
    PLLFEED = 0x55;
	while ( ((PLLSTAT & (1 << 25)) == 0) );	/* Check connect bit status */
	return;
}

/******************************************************************************
** Function name:		TargetResetInit
**
** Descriptions:		Initialize the target board before running the main()
**						function; User may change it as needed, but may not
**						deleted it.
**
** parameters:			None
** Returned value:		None
**
******************************************************************************/
void TargetResetInit(void)
{
  /* This if-else statement detects if interrupt vectors located by the linker
  command file are at memory location 0 or not. */
  #pragma segment = "INTVEC"
  if (( void * )0x00000000UL == __segment_begin( "INTVEC" ))
  {
    MEMMAP = 1;  // normal flash mode
  }
  else
  {
    MEMMAP = 2 ; // user ram mode - Map lowest 64 bytes of the address space to
                 // bottom of internal RAM, moving exception vectors into place
  }

#if USE_USB
	PCONP |= 0x80000000;		/* Turn On USB PCLK */
#endif
	/* Configure PLL, switch from IRC to Main OSC */
	ConfigurePLL();

  /* Set system timers for each component */
#if (Fpclk / (Fcclk / 4)) == 1
    PCLKSEL0 = 0x00000000;	/* PCLK is 1/4 CCLK */
    PCLKSEL1 = 0x00000000;
#endif
#if (Fpclk / (Fcclk / 4)) == 2
    PCLKSEL0 = 0xAAAAAAAA;	/* PCLK is 1/2 CCLK */
    PCLKSEL1 = 0xAAAAAAAA;	
#endif
#if (Fpclk / (Fcclk / 4)) == 4
    PCLKSEL0 = 0x55555555;	/* PCLK is the same as CCLK */
    PCLKSEL1 = 0x55555555;	
#endif

    /* Set memory accelerater module*/
    MAMCR = 0;
#if Fcclk < 20000000
    MAMTIM = 1;
#else
#if Fcclk < 40000000
    MAMTIM = 2;
#else
    MAMTIM = 3;
#endif
#endif
    MAMCR = 2;

    GPIOResetInit();

    init_VIC();

    return;
}

/******************************************************************************
**                            End Of File
******************************************************************************/