关于PICC读AT93C46使用PIC的SPI模块，无法读出，附源程

只看该作者 · 2008-3-5 09:20

#include"pic.h"
#include"pic16f7x.h"

#define CS RC2
/***
   PIC16F74    AT93C46
      RC4--------DO
      RC5--------DI
      RC2--------CS
      RC3--------SK
      GND--------GND,ORG
      VDD--------VCC
***/

void MCU_init()
   {
     PORTC=0X2C;
     TRISC=0XD0;
     PORTD=0X00;
     TRISD=0X00;
     PORTE=0X00;
     TRISE=0X00;
     OPTION=0X42;//4MHZ OSC 8分频
     TMR0=131;   //1ms定时
     SSPSTAT=0;
     SSPCON=0X31;
   }
//93c46读写程序，使用SPI
void Delay(void)
{
     asm("nop");
     asm("nop");
}

unsigned char OutPut(unsigned char SendData)
{
     unsigned char temp;
     SSPBUF=SendData;
     //asm("nop");
     //asm("nop");
     while(STAT_BF==0)
     {
         asm("clrwdt");
     }
     temp=SSPBUF;
     return(temp);
}

void Ewen(void)
{
     unsigned char temp;
     CS=1;
     Delay();
     temp=0X09;
     OutPut(temp);
     temp=EWEN;   //0x80;
     OutPut(temp);
     Delay();
     CS=0;
}
void Ewds(void)
{
     unsigned char temp;
     CS=1;
     Delay();
     temp=0x02;
     OutPut(temp);
     temp=0x00;
     OutPut(temp);
     Delay();
     CS=0;

}

void WriteByte(unsigned char WData,unsigned char Adress)
{
      unsigned char wtemp;
      Ewen();
      CS=1;
      Delay();
      wtemp=0x02;
      OutPut(wtemp);
      wtemp=Adress|0x80;
      OutPut(wtemp);
      OutPut(WData);
      CS=0;
      Delay();
      CS=1;
      while(!DI);
      CS=0;
}

unsigned char  ReadByte(unsigned char Adress)
{
unsigned char wrtemp,rtemp;
CKP=1;
CS=1;
Delay();
wrtemp=0x03;
OutPut(wrtemp);
wrtemp=Adress&0x7f;
OutPut(wrtemp);
// asm()"nop";
CKP=0;
asm("nop");
rtemp=OutPut(wrtemp);
Delay();
CS=0;
CKP=1;
return(rtemp);
}
/*void WriteBytes(unsigned char *WriteData,unsigned char Number,unsigned char Adress){
  unsigned char temp;
  Ewen();
  while(Number!=0){
   temp=*WriteData;
         WriteByte(temp,Adress);
         asm("nop");
         asm("nop");
         CS=1;
         asm("nop");
         asm("nop");
         while(DI==0){
              asm("clrwdt");
         }
         Delay();
         CS=0;
         WriteData++;
         Adress++;
         Number--;
  }
}*/

void ReadBytes(unsigned char *ReadData,unsigned char Number,unsigned char Adress)
{
//unsigned char temp;
while(Number!=0)
{
asm("clrwdt");
*ReadData=ReadByte(Adress);
ReadData++;
Adress++;
Number--;
}
}

void main(void)
{
MCU_init();
WriteByte(100,1);
temp=0;
temp=ReadByte(1);
读出来的是0XFF？？
while(1);
}

关于PICC读AT93C46使用PIC的SPI模块，无法读出，附源程

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