cpld_read.c

用ICC编写的程序包括SPI

#include "Cpld_Read.h"
#include <macros.h>

int Cpld_Read(unsigned char Address)
{
  
  unsigned char temp;
  int 	 Result;
  CLI();
  if(Address)		   					//Address select
  	PORTB|=BIT(A0);			
  else
  	PORTB&=~BIT(A0);
  PORTB|=BIT(LoadL);					//LoadL set low
  NOP();
  NOP();
  PORTB&=~BIT(LoadL);					
  NOP();
  NOP();
  NOP();
  temp=CpldRead;						//Read Data low byte
  temp=CpldRead;
  
  PORTB|=BIT(LoadL);					//Set LoadL high
  
  PORTB|=BIT(LoadH);					//LoadH set low
  NOP();
  NOP();
  PORTB&=~BIT(LoadH);					
  NOP();
  NOP();
  NOP();
  Result=CpldRead;						//Read Data low byte
  Result=CpldRead;
  
  PORTB|=BIT(LoadH);					//LoadH set high
  
 Result=(Result<<8)+temp;
 SEI();
 
 return	 Result;
 
 }
 
 void  Cpld_Set(void)
 {
  	CLI();			 	 				//Set all the counters reset 
	PORTB|=BIT(Set);					//Zero
	NOP();
	NOP();
	PORTB&=~BIT(Set);
	NOP();
	NOP();
	NOP();
	NOP();
	NOP();
	NOP();
	PORTB|=BIT(Set);
	SEI();
}

void  Cpld_Init(void)
{	  
 PORTB|=BIT(Set);	 	 				//Set All Control signal high
 PORTB|=BIT(LoadL);
 PORTB|=BIT(LoadH);
 PORTB&=~BIT(LoadL);

}