1: #include <pic18.h>
     2: #include <stdio.h>
     3: #include <string.h>
     4: #include "lcd.h"
     5: #include "Delay.h"
     6: // Delay.h is included inside lcd.c
     7: 
     8: #define LCD_LENGTH 16
     9: #define LCD_ROWS 2
    10: 
    11: 
    12: unsigned char global_Pot_Hi, global_Pot_Lo;
    13: unsigned char global_LCD_Buffer[LCD_ROWS][LCD_LENGTH];
    14: unsigned char global_serial_data;
    15: unsigned char global_serial_recieve_buffer[LCD_LENGTH];
    16: bit global_recieve_done = 0;
    17: int global_serial_byte_counter = 0;
    18: 
    19: void serial_recieved(void);
    20: 
    21: // Nicked from H7
    22: void ad_init(void)
    23: {
    24:         // AD Conversion clock
    25:         ADCS0 = 0;
    26:         ADCS1 = 0;
    27:         ADCS2 = 0;
    28: 
    29:         //Select AN0/RA0 for AD source
    30:                 // In this (000) setup, it's only RA0/AN0 that does ad convertion.
    31:         CHS0=0;
    32:         CHS1=0;
    33:         CHS2=0;
    34:         
    35:         //Only AN0 is selected for AD and with Vdd/Vss as limits
    36:         PCFG0=0;
    37:         PCFG1=1;
    38:         PCFG2=1;
    39:         PCFG3=1;
    40:         
    41:         //Result is left justified
    42:         ADFM=0; 
    43:         
    44:         //Fire up for A/D converter module
    45:         ADON=1;
    46: }
    47: 
    48: void rs232_init(void)
    49: {
    50:         SPEN    = 0;    // Serial Port Enable Bit... 0 = disabled
    51:         TRISC6  = 0;    
    52:         TRISC7  = 1;
    53: 
    54:         SPBRG   = 207;  // 1200 baud rate... 25 = 9600
    55:                                         // x = (Fosc / (16*[baud rate]) )-1
    56:         TXSTA   = 0x24; // Enables BRGH and TXEN inthe TXSTA register
    57:         RCSTA   = 0x90; // 0x90 enables SPEN and CREN in the RCSTA register
    58: }
    59: 
    60: void interrupt_init(void)
    61: {
    62:         // Assumes that all interrupts default is 0
    63:         PEIE    = 1;
    64:         GIE             = 1;
    65:         RCIE    = 1;    // Recieve interrupt enable.
    66:         IPEN    = 0;    // Nfo interrupt priority
    67:         TXIE    = 0;    // Serial interrupt enabled
    68: }       
    69: 
    70: void pic18_io_init(void)
    71: {
    72:         TRISA0  = 1;    // analog input
    73:         TRISB1  = 1;    // TRISB1-4 Digital input
    74:         TRISB2  = 1;
    75:         TRISB3  = 1;
    76:         TRISB4  = 1;
    77: }       
    78: 
    79: 
    80: 
    81: void interrupt interrupt_handler(void)
    82: {
    83:         // Finds out what interrupt have been trigged, and starts the respective function.
    84:         if(RCIF == 1)                   // Serial recieve interrupt
    85:         {
    86:                 serial_recieved();
    87:                 RCIF = 0;
    88:         }
    89: }               
    90: 
    91: 
    92: 
    93: void serial_send(void)
    94: {
    95:         int i;
    96:         char tosend[3];
    97:         char data;
    98:         sprintf(tosend,"%s", "at\r");
    99:         for(i = 0; i < 3; i++)
   100:         {
   101:                 data = tosend[i];
   102:                 TXREG = data;
   103:                 while(TRMT==0) 
   104:                 DelayMs(1000);
   105:         }
   106: }       
   107: 
   108: void serial_recieved(void)
   109: {
   110:         char data, saved_data[LCD_LENGTH];
   111:         
   112:         data = RCREG;
   113:         
   114:         global_serial_recieve_buffer[global_serial_byte_counter] = data;
   115:         if(data == '\r')
   116:         {
   117:                 global_recieve_done = 1;
   118:                 global_serial_byte_counter = 0;
   119:         }       
   120:         else
   121:         {
   122:                 global_serial_byte_counter++;
   123:         }
   124:         
   125: }
   126:         
   127: void main()
   128: {
   129: /////////////////////////////////////////////
   130: // Running Init's
   131: 
   132:         // Running init for various components.
   133:         //AD_init();
   134:         ad_init();
   135:         rs232_init();
   136:         pic18_io_init();
   137:         lcd_init(0);
   138:         interrupt_init();
   139:         
   140: /////////////////////////////////////////////
   141: // Main loop
   142: 
   143:         while(1)
   144:         {
   145:         DelayMs(3000);
   146:         serial_send();
   147:         // Checking if A/D convertion is done, and save the data in global_Pot_??
   148:                 if(GODONE==0)
   149:                 {
   150:                         global_Pot_Hi = ADRESH;
   151:                         global_Pot_Lo = ADRESL;
   152:                         GODONE = 1;
   153:                 }
   154:                 
   155:         if( global_recieve_done == 1 )
   156:         {
   157:                 lcd_clear();
   158:                 lcd_goto(0x00);
   159:                 lcd_puts(global_serial_recieve_buffer);
   160:         }
   161:         //update_lcd();
   162:         }
   163: }