12c508.c

pic12c508.c program for ov7950

/////////////////////////////////////////////////////////////////////////
////              pic12c508.c program  for ov7950                    ////
////     OmniVision Serial Camera Control Bus (SCCB)                 ////
////  Configure the CCS prototype card as follows:                   ////
////             12C508                      Protoboard              ////
////                  1 VDD                  +3.3V                   ////
////                  2 GP5/OSC1/CLKIN       NC                      ////
////                  3 MIRROR/OSC2             MIRROR  0 ENABLE        ////
////                  4 GP3/MCLR/VPP         +3.3V                   ////
////                  5 RST/T0CKI            RST                     ////
////                  6 SIO_C                  SIOC                    ////              
////                  7 SIO_D                  SIOD                    ////
////                  8 VSS                  GND                     ////

////  This example will work with the PCB and PCM compilers.  The    ////
////  following conditional compilation lines are used to include a  ////
////  valid device for each compiler.  Change the device and clock   ////
////  for your hardware if needed.                                   ////
/////////////////////////////////////////////////////////////////////////
//// This source code may only be used by licensed users of the CCS  ////
//// C compiler.  This source code may only be distributed to other  ////
//// licensed users of the CCS C compiler.  No other use,            ////
//// reproduction or distribution is permitted without written       ////
//// permission.  Derivative programs created using this software    ////
//// in object code form are not restricted in any way.              ////
/////////////////////////////////////////////////////////////////////////

#if defined(__PCB__)
#include <12C508.h>
#include <Intrins.h>
#fuses INTRC,NOWDT,NOPROTECT, NOMCLR
#use delay(clock=4000000)
#define SIO_D     PIN_B0
#define SIO_C     PIN_B1
#define RST       PIN_B2
#define GP3       PIN_B3
#define MIRROR    PIN_B4   //0 ENABLE
#define GP5       PIN_B5   // NC
#elif defined(__PCM__)
#endif

void main() {
#if defined(__PCB__)
   setup_counters (RTCC_INTERNAL,RTCC_DIV_2);
                               // See .h file for other special
                               // options for setup_counters
#else
   setup_counters (RTCC_INTERNAL,RTCC_DIV_2);
#endif

   while (TRUE) {
      if (!input (GP3))
		   RST=0 ;
      else
		   RST=1 ;
   }
}


void nops(void)
{
 Nop;
 nop;
 nop;
 nop;
 nop;
}

void hnops(void)
{
 nop;
 nop;
}


unsigned char Read_CMOS(unsigned char DeviceAddress,unsigned char RegisterAddress)
{
 unsigned char bdata Buffer_Data;

 bit Buffer_Data0=Buffer_Data^0;
 bit Buffer_Data1=Buffer_Data^1;
 bit Buffer_Data2=Buffer_Data^2;
 bit Buffer_Data3=Buffer_Data^3;
 bit Buffer_Data4=Buffer_Data^4;
 bit Buffer_Data5=Buffer_Data^5;
 bit Buffer_Data6=Buffer_Data^6;
 bit Buffer_Data7=Buffer_Data^7;

 Buffer_Data=DeviceAddress;
 F0=0; 
 //SIO_E=0;
 //nops();

 SIO_C=1;
 SIO_D=1;
 nops();
 SIO_D=0;
 nops();
 SIO_C=0;  
 nops();         //Start

 SIO_D=Buffer_Data7;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit7
 
 SIO_D=Buffer_Data6;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit6

 SIO_D=Buffer_Data5;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit5

 SIO_D=Buffer_Data4;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit4

 SIO_D=Buffer_Data3;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit3

 SIO_D=Buffer_Data2;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit2

 SIO_D=Buffer_Data1;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit1

 SIO_D=Buffer_Data0;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit0

 SIO_C=1;
 if(SIO_D)
    { 
      if(SIO_D)
      F0=1;
    }
 else
    nops();
 SIO_C=0;     
 nops();        //check Ack   
   
 Buffer_Data=RegisterAddress; 

 SIO_D=Buffer_Data7;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit7
 
 SIO_D=Buffer_Data6;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit6

 SIO_D=Buffer_Data5;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit5

 SIO_D=Buffer_Data4;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit4

 SIO_D=Buffer_Data3;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit3

 SIO_D=Buffer_Data2;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit2

 SIO_D=Buffer_Data1;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit1

 SIO_D=Buffer_Data0;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit0

 SIO_C=1;
 if(SIO_D)
    { 
      if(SIO_D)
      F0=1;
    }
 else
    nops();
 SIO_C=0;     
 nops();        //check Ack 
 
//read data 
 Buffer_Data=0xff; 
 SIO_C=1;
 hnops();
 Buffer_Data7=SIO_D;
 hnops();
 SIO_C=0;
 nops();        //bit7

 SIO_C=1;
 hnops();
 Buffer_Data6=SIO_D;
 hnops();
 SIO_C=0;
 nops();         //bit6

 SIO_C=1;
 hnops();
 Buffer_Data5=SIO_D;
 hnops();
 SIO_C=0;
 nops();         //bit5

 SIO_C=1;
 hnops();
 Buffer_Data4=SIO_D;
 hnops();
 SIO_C=0;
 nops();          //bit4

 SIO_C=1;
 hnops();
 Buffer_Data3=SIO_D;
 hnops();
 SIO_C=0;
 nops();          //bit3

 SIO_C=1;
 hnops();
 Buffer_Data2=SIO_D;
 hnops();
 SIO_C=0;
 nops();          //bit2

 SIO_C=1;
 hnops();
 Buffer_Data1=SIO_D;
 hnops();
 SIO_C=0;
 nops();          //bit1

 SIO_C=1;
 hnops();
 Buffer_Data0=SIO_D;
 hnops();
 SIO_C=0;
 nops();          //bit0

 SIO_C=1;
 if(SIO_D)
    { 
      if(SIO_D)
      F0=1;
    }
 else
    nops();
 SIO_C=0;     
 nops();        //check Ack  

 
 SIO_C=1;
 SIO_D=0;
 nops();
 SIO_D=1;
 nops();
 SIO_C=1;
 SIO_D=1;       //stop
 
 return Buffer_Data;
}

bit Write_COMS(unsigned char DeviceAddress,unsigned char RegisterAddress,char Write_Data)
{
 ACC=DeviceAddress;
 F0=0; 
 //SIO_E=0;
 //nops();
SIO_C=1;
 SIO_D=1;
 nops();
 SIO_D=0;
 nops();
 SIO_C=0;  
 nops();         //Start

 SIO_D=ACC^7;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit7
 
 SIO_D=ACC^6;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit6

 SIO_D=ACC^5;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit5

 SIO_D=ACC^4;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit4

 SIO_D=ACC^3;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit3

 SIO_D=ACC^2;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit2

 SIO_D=ACC^1;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit1

 SIO_D=ACC^0;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit0

 SIO_C=1;
 if(SIO_D)
    { 
      if(SIO_D)
      F0=1;
    }
 else
    nops();
 SIO_C=0;     
 nops();        //check Ack   
   
 ACC=RegisterAddress; 

 SIO_D=ACC^7;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit7
 
 SIO_D=ACC^6;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit6

 SIO_D=ACC^5;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit5

 SIO_D=ACC^4;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit4

 SIO_D=ACC^3;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit3

 SIO_D=ACC^2;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit2

 SIO_D=ACC^1;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit1

 SIO_D=ACC^0;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit0

 SIO_C=1;
 if(SIO_D)
    { 
      if(SIO_D)
      F0=1;
    }
 else
    nops();
 SIO_C=0;     
 nops();        //check Ack 

ACC=Write_Data; 

 SIO_D=ACC^7;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit7
 
 SIO_D=ACC^6;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit6

 SIO_D=ACC^5;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit5

 SIO_D=ACC^4;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit4

 SIO_D=ACC^3;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit3

 SIO_D=ACC^2;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();         //bit2

 SIO_D=ACC^1;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit1

 SIO_D=ACC^0;
 SIO_C=1;
 nops();
 SIO_C=0;
 nops();        //bit0

 SIO_C=1;
 if(SIO_D)
    { 
      if(SIO_D)
      F0=1;
    }
 else
    nops();
 SIO_C=0;     
 nops();        //check Ack 
 
 SIO_C=1;
 SIO_D=0;
 nops();
 SIO_D=1;
 nops();
 SIO_C=1;
 SIO_D=1;       //stop

 return F0;
}