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74597 Driver

 
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Humberto



Joined: 08 Sep 2003
Posts: 1183
Location: Buenos Aires la Reina del Plata

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74597 Driver
PostPosted: Thu Jan 25, 2007 4:55 pm     Reply with quote

Code:

/////////////////////////////////////////////////////////////////////////
////                             74597.C                             ////
////                                                                 ////
////  Driver for 74**597  8 Bit Shift Register with input latches    ////
////                                                                 ////
////  void init_597( )                                               ////
////                    Must be called once in the initializacion.   ////
////                                                                 ////
////  int get_597_In( )                                              ////
////                    Return the 8 parallel input data.            ////
////                                                                 ////
////                                                                 ////
////  Autor: Humberto                                                ////
////                                                                 ////
/////////////////////////////////////////////////////////////////////////
//
//-----------------------------------------------------------------------
//
// 74**597  8 Bit Shift Register with input latches
//
// PIN nomenclature used in the code is as follows:
//
//       PIN OUT       
//       ___  ___
//     -|1       |- Vcc                     < = INPUTS
//     -|        |-                         > = OUTPUTS
//     -|       <|- PIN14 SER
//     -|       <|- PIN13 SLOAD 
//     -|       <|- PIN12 RCK
//     -|       <|- PIN11 SCK
//     -|       <|- PIN10 SCLR
// Gnd -|       >|- PIN9  Qout
//      |________|
//             
//---------------------------------------------------------------------

void init_597()
{
   output_low(SCLR);      // activate reset
   delay_us(10);          //   
   output_low(SCK);       // idle level
   output_low(RCK);       // idle level
   output_high(SLOAD);    // select serial
   output_high(SCLR);     // deactivate reset
}

//---------------------------------------------------------------------

int get_597_In()
{
int8 i, value;

  output_high(RCK);       // Data loaded to input latches
  delay_us(10);
  output_low(RCK);        // Freeze inputs
  delay_us(10);                 
  output_low(SLOAD);      // Data transfer from input latch to
  delay_us(10);           // shift registers
  output_high(SLOAD);

  for(i=1; i<=8; i++)     // Clock-in while collecting bits...
     {
      shift_left(&value,1,input(Qout));
      output_high(SCK);   // going up clock pulse
      delay_us(10);               
      output_low(SCK);    // recover idle level
     }
  return(value);
}

//-------------------------------------------------------------------


Humberto
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