target.c

基于LPC2400入门_以SmartARM2400为例 支持LPC2400系列的说明书

/****************************************Copyright (c)**************************************************
**                               Guangzou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			target.c
** Last modified Date:	2004-09-17
** Last Version:		1.0
** Descriptions:		header file of the specific codes for LPC2100 target boards
**						Every project should include a copy of this file, user may modify it as needed
**------------------------------------------------------------------------------------------------------
** Created by:			Chenmingji
** Created date:		2004-02-02
** Version:				1.0
** Descriptions:		The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:			Chenmingji
** Modified date:		2004-09-17
** Version:				1.01
** Descriptions:		Renewed the template, added more compiler supports 
**
**------------------------------------------------------------------------------------------------------
** Modified by:			LinEnqiang
** Modified date:		2007/05/26	
** Version:				1.02
** Descriptions: 		Modified for NXP23XX
**
** Modified by:			Zhangmingjie
** Modified date:		2008/04/18
********************************************************************************************************/
#define IN_TARGET

#include "config.h"

extern void Reset(void);

/*********************************************************************************************************
** Function name:			FIQ_Exception
**
** Descriptions:			Fast interrupt exceptional handler , change it as needed
**
** input parameters:		None
** Returned value:			None
**         
** Used global variables:	None
** Calling modules:			None
**
** Created by:				Chenmingji
** Created Date:			2004/02/02
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void FIQ_Exception(void)
{
   // while(1);                   // change it to your code  这一句替换为自己的代码
}

/*********************************************************************************************************
** Function name:			TargetInit
**
** Descriptions:			Initialize the target board; it is called in a necessary place, change it as 
**							needed
**
** input parameters:		None
** Returned value:			None
**         
** Used global variables:	None
** Calling modules:			None
**
** Created by:				Chenmingji
** Created Date:			2004/02/02
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void TargetInit(void)
{
    /* 添加自己的代码 */
    /* Add your codes here */
}
/*********************************************************************************************************

* Function name ：    DelayNS
* Descriptions ：     长软件延时
* input parameters ： idly	延时参数，值越大，延时越久
* output parameters ：无
* Returned value ：   无
*********************************************************************************************************/
void  SDRAMDelayNS(uint32  idly)
{  
    uint32  i;
    for(; idly>0; idly--){
        for(i=0; i<5000; i++);
    }
}

/*********************************************************************************************************

**Function name ：    SDRAMInit
**Descriptions ：     初始化SDRAM
**input parameters ： 无
**output parameters ：无
**
** Created by:		  zhangzheng
** Created Date:	  2007.12.10
**-------------------------------------------------------------------------------------------------------
** Modified by:				
** Modified date:			
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void  SDRAMInit( void )
{  
     uint32 i, dummy ;

    PINSEL4  = 0x50000000;
    PINSEL5  = 0x05050555;
    PINSEL6  |= 0x55555555;
    PINSEL8  |= 0x55555555;
    PINSEL9  |= 0x50555555;
    EMCControl= 0x00000001;		/*Disable Address mirror*/


    EMCDynamictRP   = 1;        
    EMCDynamictRAS  = 3;		
    EMCDynamictSREX = 1;		
    EMCDynamictAPR  = 1;		
    EMCDynamictDAL  = 5;		
    EMCDynamictWR   = 2;		
    EMCDynamictRC   = 3;		
    EMCDynamictRFC  = 3;		
    EMCDynamictXSR  = 5;		
    EMCDynamictRRD  = 1;		
    EMCDynamictMRD  = 2;
    
 
  

    EMCDynamicReadConfig =1;		/* Command delayed strategy */

  /* Default setting, RAS latency 3 CCLKs, CAS latenty 3 CCLKs. */
    EMCDynamicRASCAS0  = 0x00000303;

  /* 256MB, 16Mx16, 4 banks, row=13, column=9 */
    EMCDynamicConfig0 = 0x00000680;
   
#ifdef __OUT_CHIP
    SDRAMDelayNS(4);
#else   
    SDRAMDelayNS(200);
#endif
  /* Mem clock enable, CLKOUT runs, send command: NOP */
    EMCDynamicControl = 0x00000183;
#ifdef __OUT_CHIP
    SDRAMDelayNS(2);
#else   
    SDRAMDelayNS(100);
#endif    
  /* Send command: PRECHARGE-ALL, shortest possible refresh period */
    EMCDynamicControl = 0x00000103;
#ifdef __OUT_CHIP
    SDRAMDelayNS(2);
#else   
    SDRAMDelayNS(100);
#endif    
  /* set 32 CCLKs between SDRAM refresh cycles */
    EMCDynamicRefresh  = 0x00000002;
    for(i = 0; i < 0x80; i++);	/* wait 128 AHB clock cycles */
    
  /* set 28 x 16CCLKs=448CCLK=7us between SDRAM refresh cycles */
    EMCDynamicRefresh  = 28;
    
  /* To set mode register in SDRAM, enter mode by issue
  MODE command, after finishing, bailout and back to NORMAL mode. */    
  /* Mem clock enable, CLKOUT runs, send command: MODE */
    EMCDynamicControl = 0x00000083;
    dummy=*((volatile uint32 *)(0xa0033000));
    EMCDynamicControl = 0x00000000;	  /* Send command: NORMAL */
    EMCDynamicConfig0 |= 0x00080000;	  /* Enable buffer */
    SDRAMDelayNS(10);
}
/*********************************************************************************************************
** Function name:			TargetResetInit
**
** Descriptions:			Initialize the target 
**
** input parameters:		None
** Returned value:			None
**         
** Used global variables:	None
** Calling modules:			None
**
** Created by:				Chenmingji
** Created Date:			2004/02/02
**-------------------------------------------------------------------------------------------------------
** Modified by:				Zhangmingjie
** Modified date:			2008/02/23
** Modified by:				Zhangmingjie
** Modified date:			2008/04/18
**------------------------------------------------------------------------------------------------------
** Modified by:				Zhanghuping
** Modified date:			2008/04/25
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void TargetResetInit(void)
{


#ifdef __DEBUG_RAM    
    SDRAMInit();                                                        /* 配置外部SDRAM                */
    MEMMAP = 0x02; 
                     									                /* remap 从内部SRAM		 		*/
#endif

#ifdef __DEBUG_SDRAM 
    uint8 i;
    uint32 *cp1,*cp2;
    cp1=(uint32*)Reset;
    cp2=(uint32*)0x40000000; 
    for(i=0;i<16;i++)
    {  
       *cp2++ = *cp1++;
    }  
    MEMMAP = 0x2;                  	 	                                /* remap 从内部SRAM映射       */
#endif

#ifdef __DEBUG_FLASH    
    SDRAMInit();                                                        /* 配置外部SDRAM               */
    MEMMAP = 0x01;                   									/* remap 从片内Flash			*/
#endif

#ifdef __IN_CHIP 
    SDRAMInit();                                                        /* 配置外部SDRAM               */  
    MEMMAP = 0x01;                   									/* remap 从片内Flash			*/                                                                               
#endif
#ifdef __OUT_CHIP    

    /*  
     * Edit for LPC2460/70 
     * 将中断向量表复制到片内
     * 的SRAM的前64个字节
     */
    unsigned int i;
    uint32 *cp1, *cp2;

    extern void Reset(void);
    
    cp1 = (uint32 *)Reset;
    cp2 = (uint32 *)0x40000000;
    for (i = 0; i < 16; i++)
    {
        *cp2++ = *cp1++;
    }
    
    MEMMAP           = 0x02;                   							/* remap 到内部RAM				*/

	/*  
	 *  Edit for LPC2460/70
     *  配置外部总线访问SST36VF1601C
     *  的速度，其中，将读取速度
     *  配置为最快，写速度配置为最快 	
     */
    
    PINSEL6          = 0x55555555;              						/* 配置外部总线D0~D15  	        */
    PINSEL8          = 0x55555554;										/* 配置外部总线A1~A15  	        */
    PINSEL9          = 0x40050155;              						/* 配置外部总线A16~A20,OE,WE,CS1*/

    EMCControl       = 0x01;											/* 使能外部EMC，禁止镜像        */
    EMCStaticConfig1 = 0x00000081;              						/* 配置外部总线，16bit宽度 	    */ 
	EMCStaticWaitRd1 = 4;												/* 配置外部总线，读延时3cclk 	*/ 
	EMCStaticWaitOen1  = 0x01;											/* 输出使能延时1cclk 			*/ 
	
	EMCStaticWaitWen1  = 0x00;											/* 写使能延时1cclk 			*/ 
	EMCStaticWaitWr1   = 0x02;											/* 写延时4cclk		 			*/ 
	
	SDRAMInit();                                                        /* 配置外部SDRAM               */
#endif 		
	if ( PLLSTAT & (1 << 25) )
    {
		PLLCON = 1;														/* Enable PLL, disconnected 	*/
		PLLFEED = 0xAA;
		PLLFEED = 0x55;
    }

    PLLCON = 0;															/* Disable PLL, disconnected 	*/
    PLLFEED = 0xAA;
    PLLFEED = 0x55;
    while(PLLSTAT & (3 << 24));	
	
    SCS = (SCS & 0x04)|0x20;             								/* Enable the mainOSC,1MHz~20MHz*/
	while((SCS & 0x40) == 0 );			 								/* Wait until main OSC is usable*/
	
	CLKSRCSEL = 0x01;					 								/* select main OSC as the PLL 	*/
																		/* clock source 				*/
										 
    PLLCFG  = (((PLL_NValue) << 16)|(PLL_MValue));    
      
	PLLCON = 1;
    PLLFEED = 0xAA;														/* Enable but disconnect the PLL*/
    PLLFEED = 0x55;	
    while (((PLLSTAT & (1 << 24)) == 0));								/* Wait until the PLL is usable	*/
	
	CCLKCFG = CCLKDivValue;	
	   	
	#if USE_USB 			
 		USBCLKCFG = USBCLKDivValue;										/* usbclk = 480 MHz/10 = 48 MHz */
 		PCONP |= 0x80000000;											/* Turn On USB PCLK 			*/
	#else 	  		
		USBCLKCFG = USBCLKDivValue;	
		PCONP &= 0x7FFFFFFF;    	
	#endif 		
	while ( ((PLLSTAT & (1 << 26)) == 0) );								/* Check lock bit status 		*/
	while (((PLLSTAT & 0x00007FFF) != PLL_MValue) && (((PLLSTAT & 0x00FF0000) >> 16) != PLL_NValue));
	
 	PLLCON  = 3;														/* connect the PLL 				*/
    PLLFEED = 0xAA;
    PLLFEED = 0x55;	    						
	while (((PLLSTAT & (1 << 25))!= (1 << 25)));						/* Wait until the PLL is 		*/ 
																		/* connected and locked 		*/
	
	/*  
	 *  Set system timers for each component  
	 */
#if (Fpclk / (Fcclk / 4)) == 1

    PCLKSEL0 = 0x00000000;												/* PCLK is 1/4 CCLK 			*/
    PCLKSEL1 = 0x00000000;

#else

    #if (Fpclk / (Fcclk / 4)) == 2

    PCLKSEL0 = 0xAAAAAAAA;												/* PCLK is 1/2 CCLK 			*/
    PCLKSEL1 = 0xAAAAAAAA;	 

    #else

    PCLKSEL0 = 0x55555555;												/* PCLK is the same as CCLK 	*/
    PCLKSEL1 = 0x55555555;	
    
    #endif 
#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;      	
   
    /* 
     *  Add your codes here 
     */
   
    return;
}
/*********************************************************************************************************
**                  以下为一些与系统相关的库函数的实现
**                  具体作用请ads的参考编译器与库函数手册
**                  用户可以根据自己的要求修改        
********************************************************************************************************/
/*********************************************************************************************************
**                  The implementations for some library functions
**                  For more details, please refer to the ADS compiler handbook and The library 
**					function manual
**                  User could change it as needed       
********************************************************************************************************/

#include "rt_sys.h"
#include "stdio.h"

#pragma import(__use_no_semihosting_swi)
#pragma import(__use_two_region_memory)


int __rt_div0(int a)
{
    a = a;
    return 0;
}

int fputc(int ch,FILE *f)
{
    ch = ch;
    f = f;
    return 0;
}

int fgetc(FILE *f)
{
    f = f;
    return 0;
}

int _sys_close(FILEHANDLE fh)
{
    fh = fh;
    return 0;
}

int _sys_write(FILEHANDLE fh, const unsigned char * buf,
                      unsigned len, int mode)
{
    fh = fh;
    buf = buf;
    len =len;
    mode = mode;
    return 0;
}

int _sys_read(FILEHANDLE fh, unsigned char * buf,
                     unsigned len, int mode)
{
    fh = fh;
    buf = buf;
    len =len;
    mode = mode;
    
    return 0;
}

void _ttywrch(int ch)
{
    ch = ch;
}

int _sys_istty(FILEHANDLE fh)
{
    fh = fh;
    return 0;
}

int _sys_seek(FILEHANDLE fh, long pos)
{
    fh = fh;
    return 0;
}

int _sys_ensure(FILEHANDLE fh)
{
    fh = fh;
    return 0;
}

long _sys_flen(FILEHANDLE fh)
{
    fh = fh;
    return 0;
}

int _sys_tmpnam(char * name, int sig, unsigned maxlen)
{
    name = name;
    sig = sig;
    maxlen = maxlen;
    return 0;
}

void _sys_exit(int returncode)
{
    while(1);
}

char *_sys_command_string(char * cmd, int len)
{
    cmd = cmd;
    len = len;
    return 0;
}
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/