interface8051.c

Interface 8051 to Coolrunner CPLD(Xilinx App)

#include <reg52.h>
#include <stdio.h>

#include "common.h"

void SetBaud(void)
{
  u16 BaudSpeed;
  u16 Tick;
  u8  TickH,TickL;

  TickH=0;
  TickL=0;
//  T2CON=0x01;								// Timer2, Timer Mode, Clear TF2
  T2CON=0x00;
  TH2=0;									// Load Timer2 start value
  TL2=0;
  while(P30);								// Wait for Start bit, falling edge
  TR2=1;									// Start Timer2 (Count-up)
  while(!TF2)								// While Timer2 not overflow (TF2=1)
  {
    while( !TF2 && !P30 );					// Wait for rising edge Timer2 overflow
    TickH=TH2;								// Capture Timer2
    TickL=TL2;
    while( !TF2 && P30 );					// Wait for falling edge or Timer2 overflow
  }
  TR2=0;									// Stop Timer2
  TF2=0;									// Clear overflow flag
  Tick=(TickH<<8)+TickL;					// Tick = duration from start bit to stop bit

  BaudSpeed=65536.084-Tick*0.0417372+0.5;	// Round to nearest integer

  SCON  = 0x52;								// SCON: Mode 1, 8-bit UART, enable rcvr
  RCAP2H= BaudSpeed>>8;
  RCAP2L= BaudSpeed&0x00FF;
  T2CON = 0x3C;								// Timer 2, Mode baud rate generator
}

#if 0
bit breakFromLoop=0;
u16 coinCount=0;
void Int_Timer2(void) interrupt 5 using 0
{
	ET2=0;
	EXF2=0;
	breakFromLoop=1;
	TMOD |= 0x01;				// Timer 0, Mode 1, 16-bit
	TH0=0;						// Load Initial value
	TL0=0;
	TF0=0;						// Clear Overflow Flag
	TR0=1;						// Start Timer0
	while(!P11);
	TR0=0;						// Stop Timer0
	if (TF0) {
		coinCount++;			// Overflow Occur
		printf("Coin = %d\n", coinCount);
		TF0=0;
	}
	ET2=1;
}
#endif
#if 0
volatile u8 xdata spisr _at_ 0x2080;
volatile u8 xdata spicr _at_ 0x2084;
volatile u8 xdata spitr _at_ 0x208a;	
volatile u8 xdata spirr _at_ 0x208e;	

u8 spiStatus=0;
u16 countInInt=0;
bit IntFlag=0;
#endif
volatile u8 xdata dataInReg _at_ 0xa084;	
volatile u8 xdata addrZero _at_ 0x0051;	

void main(void)
{
  u16 i=0;
  u8 xdata *x=0;
  u16 j;
	
  EA=1;

//  EX0=1;	//enable interrupt 0
//  P33=1;
//  P33=0;	//Reset CPLD
//  P33=1;
	P10=1;	
	P10=1;
	for(i=0;i<50;i++);
	P10=0;
	P10=0;
	P10=1;
  SetBaud();
//  ET2=1;	//Enable Timer2 interrupt
  printf("RUN\n");
#if 0
  P34=1; //CS of MMC much be high

	while (spisr&0x20); 
		printf("Bus Busy\n");
	spicr=0xdf;

	spitr=0x55;	//dummy data for gen 80 clk
	spicr=0xff;	//start transfer
	while(countInInt<3) {
		if (IntFlag) spitr=0x55;
		IntFlag=0;
	}

//	while(countInInt<3) spitr=0xff;
	spicr=0x00;	//stop transfer

//	while(1) {
		if(spiStatus) printf("SPI Status =%bx\n",spiStatus);
		if(countInInt) printf("Enter %u times\n",countInInt);

//	}
#endif
//	while(1) addrZero=0x00;
  for(j=0;j<256;j++) {
    printf("j=%d\r",j);
  	for(i=0x0000;i<0x8000;i++) {
  		dataInReg=0x51;
      x[i]=j;
      x[i+1]=j+1;
      x[i+2]=j+2;
      x[i+3]=j+3;
      if(x[i]!=j) {
        printf("Memory error at %x\n",i);
      }
//	  getchar();
    }
  }

//	ET2=1;	//Enable Timer2 interrupt
}
#if 0
void Int_Ext_0(void) interrupt 0 using 1
{
	EX0=0;
	spiStatus=spisr;
	countInInt++;
	if(countInInt) printf("Enter %u times\n",countInInt);
	IntFlag=1;
	EX0=1;
}
#endif