lab6.lst

PICC 16X Code for study and learning

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     2: 
     3: /****************************************************************
     4: *                       Hi-Tech workshop exercise Lab6                                          *
     5: *****************************************************************
     6: *                                                                                                                               *
     7: *   Files required:                                                                                             *
     8: *                                                                                                                               *               
     9: *                   lab6.c                                                                              *
    10: *                   cnfig877a.h (Set the Configuration Word)    *
    11: *                                                                                                                               *
    12: *                   pic.h        (Hi-Tech file)                                 *
    13: *                                                                                                                               *
    14: *****************************************************************
    15: *                                                                                                                               *
    16: *   Notes:                                                                                                              *
    17: *                                                                                                                               *
    18: *   Device Fosc -> 16.00MHz (Clock supplied by target)                  *
    19: *                                                                                                                               *       
    20: *****************************************************************/
    21: 
    22: #include <pic.h>                                // processor if/def file
    23: #include "cnfig877a.h"
    24: 
    25: //**********************************
    26: //* Function Prototype Declaration
    27: //**********************************
    28: void interrupt isr_Sevr ( void );
    29: 
    30: // ================================================================
    31: // **** Establish PIC16F877A Configuration Word
    32: // **** == HS Oscillator Mode
    33: // **** == Brown-Out Detect Enabled
    34: // **** == Watch-Dog Timer Off
    35: // **** == Code Protect Off
    36: // **** == Low Voltage Programming Off
    37: // **** == ICD2 Debug Mode On
    38: 
    39: __CONFIG  ( HS_OSC & BODEN_ON & WDT_OFF & CP_OFF & LVP_OFF & DEBUG_ON ); 
    40: 
    41: // =================================================================
    42: 
    43: volatile unsigned char Long_Count ;
    44: volatile unsigned char Direct_LED ;
    45: volatile unsigned char Dir_Count ;
    46: 
    47: void main(void)
    48: {
    49:                 TRISD=0x00;                                     // Set output port for LED driver
    50:                 PORTD=0b00000001;                       // Set b0 of LED is On
    51: 
    52:                 T2CON=0b01111110;                       // Timer2 On, Postscale=16, Prescale=16
    53:                 TMR2IE=1;                                       // Enable Timer2 Interrupt
    54:                 PEIE=1;                                         // Set Timer2 for High Priority
    55:                 GIE=1;                                          // Enable High Priority Interrupt
    56:                 PR2 = 155;                                      //(16Mhz/4) [16*16*(155+1)] = 10mS 
    57: 
    58:                 Long_Count=0;
    59:                 Direct_LED=0;
    60:                 Dir_Count=0;
    61: 
    62:                 while(1);                                       // Loop Here!
    63: }
    64: 
    65: 
    66: //***********************************************
    67: //*             Interrupt Service Routine                       *       
    68: //***********************************************
    69: 
    70: void interrupt isr_Sevr ( void )
    71:  
    72: {
    73:         TMR2IF=0;                                                       // Clear Timer2 interrupt Flag
    74: 
    75:         if (Long_Count <=10) Long_Count++;  // 10mS * 10 = 100mS
    76:         else
    77:         {       
    78:                 Long_Count=0;                                   // Time is 100mS, do the function
    79: 
    80:                 if (Direct_LED==0x00)                   // Right or Left shift
    81:                 {
    82:                         PORTD<<=1;                                      // LED left shift
    83:                         Dir_Count++;
    84:                         if (Dir_Count==7)                       // End of LED position?
    85:                         {
    86:                                 Dir_Count=0;                    // Yes, set flag of right shift
    87:                                 Direct_LED=0x1;
    88:                         }
    89:                 }
    90:                 else
    91:                 {
    92:                         PORTD>>=1;                                      // LED right shift
    93:                         Dir_Count++;
    94:                         if (Dir_Count==7) 
    95:                         {
    96:                                 Dir_Count=0;
    97:                                 Direct_LED=0x00;
    98:                         }
    99:                 }
   100:         }               
   101: }                                                               
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