DSP 之外部存储器接口(EMIF)

DSP 之外部存储器接口(EMIF):

 

/******************************************************************************/
/*  Copyright 2004 by SEED Electronic Technology LTD.                         */
/*  All rights reserved. SEED Electronic Technology LTD.                      */
/*  Restricted rights to use, duplicate or disclose this code are             */
/*  granted through contract.                                                 */
/*                                                                            */
/*                                                                            */
/******************************************************************************/

#include 
#include 
#include 
#include 
#include 

Uint16 x;
Uint32 y;
CSLBool b;
unsigned int datacount = 0;
int databuffer[1000] ={0};
int *souraddr,*deminaddr;
Uint16 button;
unsigned char k1_down, k2_down, k3_down, k4_down;


/*锁相环的设置*/
PLL_Config  myConfig      = {
  0,    //IAI: the PLL locks using the same process that was underway 
                //before the idle mode was entered
  1,    //IOB: If the PLL indicates a break in the phase lock, 
                //it switches to its bypass mode and restarts the PLL phase-locking 
                //sequence
  24,    //PLL multiply value; multiply 24 times
  1             //Divide by 2 PLL divide value; it can be either PLL divide value 
                //(when PLL is enabled), or Bypass-mode divide value
                //(PLL in bypass mode, if PLL multiply value is set to 1)
};
/*SDRAM的EMIF设置*/
EMIF_Config emiffig = {
  0x221, 	//EGCR  : the MEMFREQ = 00,the clock for the memory is equal to cpu frequence
  			//		  the WPE = 0 ,forbiden the writing posting when we debug the EMIF
  			//        the MEMCEN = 1,the memory clock is reflected on the CLKMEM pin
  			//        the NOHOLD = 1,HOLD requests are not recognized by the EMIF 
  0xFFFF,	//EMI_RST: any write to this register resets the EMIF state machine
  0x3FFF,	//CE0_1:  CE0 space control register 1
  			//        MTYPE = 011,Synchronous DRAM(SDRAM),16-bit data bus width
  0xFFFF,   //CE0_2:  CE0 space control register 2
  0x00FF,   //CE0_3:  CE0 space control register 3
  			//        TIMEOUT = 0xFF;
  0x1FFF,	//CE1_1:  CE0 space control register 1
            //        Asynchronous, 16Bit
  0xFFFF,	//CE1_2:  CE0 space control register 2
  0x00FF,	//CE1_3:  CE0 space control register 3
  0x1FFF,	//CE2_1:  CE0 space control register 1
            //        Asynchronous, 16Bit
  0xFFFF,	//CE2_2:  CE0 space control register 2
  0x00FF,	//CE2_3:  CE0 space control register 3
  
  0x7FFF,	//CE3_1:  CE0 space control register 1
  0xFFFF,	//CE3_2:  CE0 space control register 2
  0x00FF,	//CE3_3:  CE0 space control register 3
  
  0x2911,   //SDC1:   SDRAM control register 1
  			//		  TRC = 8 
  			//        SDSIZE = 0;SDWID = 0
  			//        RFEN = 1
  			//        TRCD = 2
  			//        TRP  = 2
  0x0410,	//SDPER : SDRAM period register
  			//		  7ns *4096
  0x07FF,    //SDINIT: SDRAM initialization register
  			//        any write to this register to init the all CE spaces,
  			//        do it after hardware reset or power up the C55x device
  0x0131	//SDC2:	  SDRAM control register 2
  			//        SDACC = 0;
  			//        TMRD = 01;
  			//        TRAS = 0101;
  			//        TACTV2ACTV = 0001;								
  };


main()
{
	/*初始化CSL库*/	
    CSL_init();
    
    /*EMIF为全EMIF接口*/
    CHIP_RSET(XBSR, 0x0a01);
    
    /*设置系统的运行速度为144MHz*/
    PLL_config(&myConfig);
    
    /*初始化DSP的EMIF*/
    EMIF_config(&emiffig);
  
  	/* CE2 地址写为 1111 1110  */				
    souraddr =  (int *)0x400001;
	*souraddr = 0x00fe;
	
	while(1)
	{
		button = *souraddr; // button = 1111 1110
		//scan K1-D0
		if(!(button&0x0001))  // 0000 0000  取反为 1111 1111
		{
			if(k1_down==0)
			{
				printf("K1 press\n");
				k1_down = 1;
			}
		}
		else
		{
			k1_down = 0;
		}
		//scan K2-D2
		if(!(button&0x0002))  // 1111 0100 取反为 0000 1011
		{
			if(k2_down==0)
			{
				printf("K2 press\n");
				k2_down = 1;
			}
		}
		else
		{
			k2_down = 0;
		}
		//scan K3-D3
		if(!(button&0x0004))  // 0000 0100 取反为 1111 1011
		{
			if(k3_down==0)
			{
				printf("K3 press\n");
				k3_down = 1;
			}
		}
		else
		{
			k3_down = 0;
		}
		//scan K4-D4
		if(!(button&0x0008))  // 0000 1000 取反为 1111 0111
		{
			if(k4_down==0)
			{
				printf("K4 press\n");
				k4_down = 1;
			}
		}
		else
		{
			k4_down = 0;
		}
	}
}