//-----------------------------------------------------------------------------
// IS62LV1024.c
//-----------------------------------------------------------------------------
// Copyright 2003 NCD co.ltd
//
// AUTH: Jhonsun
// DATE: 3 Mar 03
//
// This program shows an example of access data from external Sram .
//
// Assumes an 22.1184MHz crystal is attached between XTAL1 and XTAL2.
//
// Target: C8051F02x
// Tool chain:  KEIL EVAL C51
//

//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------

#include <c8051f020.h>                 // SFR declarations
#include <intrins.h>
//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F02x
//-----------------------------------------------------------------------------

sfr16 DP       = 0x82;                 // data pointer
sfr16 TMR3RL   = 0x92;                 // Timer3 reload value
sfr16 TMR3     = 0x94;                 // Timer3 counter
sfr16 ADC0     = 0xbe;                 // ADC0 data
sfr16 ADC0GT   = 0xc4;                 // ADC0 greater than window
sfr16 ADC0LT   = 0xc6;                 // ADC0 less than window
sfr16 RCAP2    = 0xca;                 // Timer2 capture/reload
sfr16 T2       = 0xcc;                 // Timer2
sfr16 RCAP4    = 0xe4;                 // Timer4 capture/reload
sfr16 T4       = 0xf4;                 // Timer4
sfr16 DAC0     = 0xd2;                 // DAC0 data
sfr16 DAC1     = 0xd5;                 // DAC1 data

//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------

#define SYSCLK       11059200          // SYSCLK frequency in Hz


//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------

void SYSCLK_Init (void);
void PORT_Init(void);
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void) {

   unsigned char  idata InBuf[35];
   unsigned long idata i;
   unsigned char idata j;
   unsigned char xdata  *idata Point1;

   WDTCN = 0xde;                       // disable watchdog timer
   WDTCN = 0xad;

   PORT_Init();
   SYSCLK_Init ();                     // initialize oscillator

   P4=0x04;                //P4.3接1024的CE1,P4.4接1024的CE2,P4.0接A16
                           //A16作為分頁數據線,A16=0 選擇BANK0:0-64K,A16=1 選擇BANK1:64-128K
   j=0;
   Point1=0x0000;
   for(i=0;i<0xFFFE;i++)
   {
     j=i/0x1000;
	 *Point1=0xaa;
	 Point1++;
   	 
	 }
	 _nop_();
    P4=0x05;                //向BANK1送數據
   _nop_();
   _nop_();
   Point1=0x0000;
   for(i=0;i<0xFFFE;i++)
   { j=i/0x1000+0x10;
     *Point1=j;
	 Point1++;
	 }
   _nop_();
   P4=0x04;                 //讀取BANK0的數據
   _nop_();
   _nop_();
   Point1=0x0000;
   for(i=0;i<16;i++)
   {
    InBuf[i]=*Point1;
	Point1+=0x1000;
	}
  _nop_();
  P4=0x05;                    //讀取BANK1的數據
  Point1=0x0000;
  for(i=16;i<32;i++)
  {
   InBuf[i]=*Point1;
   Point1+=0x1000;
   }
  while (1);
}

//-----------------------------------------------------------------------------
// Initialization Subroutines
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// This routine initializes the system clock to use an 22.1184MHz crystal
// as its clock source.
//
void SYSCLK_Init (void)
{
   int i;                              // delay counter

   OSCXCN = 0x67;                      // start external oscillator with
                                       // 22.1184MHz crystal

   for (i=0; i < 256; i++) ;           // XTLVLD blanking interval (>1ms)

   while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle

   OSCICN = 0x88;                      // select external oscillator as SYSCLK
                                       // source and enable missing clock
                                       // detector
}

void PORT_Init()
{
   XBR2    = 0x40;                     // Enable crossbar and weak pull-ups
   EMI0TC  = 0x21;                     //
  EMI0CF  =0x2f;           //EMIF端口接到P4－P7，選擇復用方式，工作模式為不帶塊選擇。
   P74OUT  = 0x3F;

}