// ***************************************************************************
//  File Name    : 7ss.c
//  Version      : 1.2
//  Description  : 7 segment display with 74HC595
//
//  Author       : Mikael Frisk(Mixmar on LMR)
//  Target       : Pic 16f690 on breadboard
//  Compiler     : HITECH PICC-Lite Version 9.83
//  IDE          : Microchip MPLAB X IDE
//  Programmer   : PICKit2
//  Last Updated : 10 Nov 2012
// ***************************************************************************
#include <pic.h>
/*   PIC Configuration Bit:
**   INTIO/FOSC_INTRCIO     - Using Internal RC No Clock
**   WDTDIS/WDTE_OFF   - Wacthdog Timer Disable
**   PWRTEN/PWRTE_ON    - Power Up Timer Enable
**   MCLREN/MCLRE_ON    - Master Clear Enable
**   UNPROTECT/CP_OFF - Code Un-Protect
**   UNPROTECT/CPD_OFF - Data EEPROM Read Un-Protect
**   BORDIS/BOREN_OFF    - Brown Out Detect Disable
**   IESODIS/IESO_OFF   - Internal External Switch Over Mode Disable
**   FCMDIS/FCMEN_OFF    - Monitor Clock Fail Safe Disable
*/
__CONFIG( FOSC_INTRCIO & WDTE_OFF & PWRTE_ON & MCLRE_ON & CP_OFF & CPD_OFF & BOREN_OFF & IESO_OFF & FCMEN_OFF );


#define FOSC 8000000L // Using Internal Clock of 8 Mhz
#define DS RC2 //data on pin C2
#define ST_CP RC1 //storage register clock input on pin C1
#define SH_CP RC0 //shift register clock input on pin C0
#define testbit(data,bitno) ((data>>bitno)&0x01)

unsigned int i,x,ty;
unsigned char Digit[10] = {0x03,0x9F,0x25,0x0D,0x99,0x49,0x41,0x1F,0x01,0x09}; //Array containing all the "digits"

/*
**0x03 hex = 0 dec = 0000 0011 bin
**0x9F hex = 1 dec = 1001 1111 bin
**0x25 hex = 2 dec = 0010 0101 bin
**0x0D hex = 3 dec = 0000 1101 bin
**0x99 hex = 4 dec = 1001 1001 bin
**0x49 hex = 5 dec = 0100 1001 bin
**0x41 hex = 6 dec = 0100 0001 bin
**0x1F hex = 7 dec = 0001 1111 bin
**0x01 hex = 8 dec = 0000 0001 bin
**0x09 hex = 9 dec = 0000 1001 bin
*/

void init(void)
{
  OSCCON=0x70;         // Select 8 Mhz internal clock
  TRISC = 0x00;        // Set all as Output
  ANSEL = 0;
  ANSELH = 0;

}
void dirty_delay(int count){
    for(int s=0;s<count;s++){
        for(int st=0;st<count;st++){
            ty=st;
        }
    }//only for a bit of rough and ugly delay
}
void write_digit(int dig_num){

       ST_CP=0; //same as RC1=0; enable write to shift register
       SH_CP=0; //same as RC0=0; enable write to bit
       //this is the loop that sends the data bit by bit to the 74HC595 since its 8 bits to send we loop it 8 times.
       for (int i=0;i<8;i++){
           // this sends the bit to the  register and "dig_num" is the digit we want to display from the array Digit[].
           // testbit(Digit[dig_num],i) takes bit i from the char in the array "Digit[dig_num]" and puts that on pin DS
           // which is our data pin.
           DS=testbit(Digit[dig_num],i); //if you have common cathode display use "DS=testbit(Digit[dig_num],i)^1"
           SH_CP=1; //same as RC1=1; write bit
           SH_CP=0;  //same as RC1=0;move on to next bit
       }
       ST_CP=1; //same as RC0=1; write the new bits to the register.
}
void main(void){
    init();
    x=0;
    while(1){
         dirty_delay(200);
         write_digit(x);
         if(x==9){x=0;}else{x++;};
    }
}
/* EOF: 7ss.c */