lab3.lst

PICC 16X Code for study and learning

     1: 
     2: /****************************************************************
     3: *                       Hi-Tech workshop exercise Lab3                                          *
     4: *****************************************************************
     5: *                                                                                                                               *
     6: *   Files required:                                                                                             *
     7: *                                                                                                                               *               
     8: *                   lab3.c                                                                              *
     9: *                                       MID_LCD.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: #include "mid_lcd.h"
    25: 
    26: //**********************************
    27: //* Function Prototype Declaration
    28: //**********************************
    29: void Init_IO(void);
    30: void Init_Adc( void );
    31: void A2D( unsigned char );
    32: void LCD_ItoA(unsigned int);
    33: unsigned char Set_BCD_ASCII(unsigned char);
    34: 
    35: // ================================================================
    36: // **** Establish PIC16F877A Configuration Word
    37: // **** == HS Oscillator Mode
    38: // **** == Brown-Out Detect Enabled
    39: // **** == Watch-Dog Timer Off
    40: // **** == Code Protect Off
    41: // **** == Low Voltage Programming Off
    42: // **** == ICD2 Debug Mode On
    43: 
    44: __CONFIG  ( HS_OSC & BODEN_ON & WDT_OFF & CP_OFF & LVP_OFF & DEBUG_ON ); 
    45: 
    46: // =================================================================
    47: 
    48: 
    49: const char LCD_Msg1[]=" A/D Result:    "; 
    50: const char LCD_Msg2[]="  MSB:   LSB:   "; 
    51: 
    52: unsigned int AD_Temp;
    53: bit DS_Zero_Flag;
    54: 
    55: union   {
    56:                 int AD_10bit;
    57:                 struct  {
    58:                                 char AD_LSB;
    59:                                 char AD_MSB;
    60:                                 }AD_Byte;
    61:                 }AD_Int;
    62: 
    63: 
    64: /*****************************
    65:     INITIALIZE I/O PORT
    66: *****************************/
    67: 
    68: void Init_IO(void)
    69: {
    70:         ADCON1=0b00000110;              // Disable A/D Function
    71:         TRISD=0x00;                             // Set PortD for Output
    72:         PORTD=0x80;                             // Initila LED display = 0x80
    73:         TRISA4=1;                               // Set SW2 for input
    74:         TRISE1=1;                               // Set SW6 for Input
    75: }
    76: 
    77: 
    78: /*****************************************
    79:     Initialize A/D & Comparator Module
    80: ******************************************/
    81: 
    82: void Init_Adc( void )
    83: {
    84:         CMCON=0b000000111;              // Analog comparator disable
    85:         ADCON1=0b00001110;              // AN0 is A/D input
    86:         ADFM=1;                                 // Right justified
    87:         ADCON0=0b10000001;              // Selext CH0 , A/D on
    88: }    
    89:                                        
    90: /***********************************
    91:         Convert A/D Channel
    92: ************************************/
    93: 
    94: void A2D( unsigned char channel )
    95: {
    96:         unsigned char temp;                             // Temp storage
    97: 
    98:         temp = channel << 3;                    // Shift channel value three bits left
    99:         ADCON0 &= 0b11000111;                   // Clear channel select bits in ADCON0
   100:         ADCON0 |= temp;                                 // Logically OR shifted channel value into place in ADCON0
   101:  
   102:         ADGO = 1;                                               // Initiate conversion on selected channel
   103:         while (ADGO) ;                                  // Poll ADGO bit until it clears, indicating conv. done
   104:         AD_Int.AD_Byte.AD_MSB=ADRESH;
   105:         AD_Int.AD_Byte.AD_LSB=ADRESL;
   106: } 
   107: 
   108: //***************************************
   109: //*             Program Main ( )                *
   110: //***************************************
   111: void main(void)
   112: {
   113:         Init_IO();
   114:         Init_Adc();
   115:         OpenLCD();
   116:         LCD_Set_Cursor(0,0);
   117:         putrsLCD(LCD_Msg1);
   118:         LCD_Set_Cursor(0,1);
   119:         putrsLCD(LCD_Msg2);
   120: 
   121:         while(1)
   122:         {
   123:                 A2D(0x00);                                              // Get 10-bit A/D result from CH0
   124:                 LCD_Set_Cursor(12,0);
   125:                 LCD_ItoA(AD_Int.AD_10bit);
   126:                 LCD_Set_Cursor(6,1);
   127:                 puthexLCD(AD_Int.AD_Byte.AD_MSB);
   128:                 LCD_Set_Cursor(13,1);
   129:                 puthexLCD(AD_Int.AD_Byte.AD_LSB);
   130:         }
   131:         
   132: }
   133: 
   134: void LCD_ItoA(unsigned int AD_Data)
   135: {
   136:                 AD_Temp=AD_Data;
   137:             DS_Zero_Flag=1;
   138: 
   139:                 putcLCD(Set_BCD_ASCII(AD_Data/1000));           // 陪ボ