/******************************************************
     PIC16F877 RS232 Serial Communication Application
*******************************************************/
#include <16f877.h>     // 
#use delay (clock=4000000) // 
#define use_portb_lcd TRUE   // 
#include <lcd.c>   // 
#use rs232 (baud=9600, xmit=pin_C6, rcv=pin_C7, parity=N, stop=1) 
// RS232 protocol 9600 bit/s
// TX, RX pins as defined , C6,C7 
// no parity bit , stop 1 bit

char keyboard[80];  // defined an array name keyboard with 80-element 

#int_rda // Receive data available Interrupt  
void rda_isr () // When Receive data available do :
{
   disable_interrupts(int_rda); // Disables the specified interrupt
   output_high(pin_c5);  // Set pin RC5 to logic 1 
   gets(keyboard); 
   //gets (string), Reads characters (using GETC()) into the string 
   //until a RETURN (value 13) is encountered 
   // Read or Receive array string "keyboard" .
   printf("\n\rYou wrote the text>  %s\n",keyboard); 
   // new line , new row , send the string expressions and array keyboard via RS232,then new line 
   printf(lcd_putc,"\f%s",keyboard);  //Clear LCD and display keyboard array string .
   output_low(pin_c5); // Set pin RC5 to logic 0
   printf("\n\rEnter the text from the keyboard and enter key to exit>"); // new line,from start ,send the text string via RS232
}

/********* Main function********/

void main ( )
{
   
   output_low(pin_c5); // Initially RC5 LED => off and on in ISR 
   lcd_init();   // 

   printf("\r**************** Hello *********************"); //New lines end specified text via RS232 .
   printf("\n\rWhen you enter data from the keyboard will appear on the LCD\n\n"); //new line,from start send specified text via RS232 .
   printf("\n\rEnter the text from the keyboard and enter key to exit>"); //new line,from start send specified text via RS232.
   
   enable_interrupts(GLOBAL);  // enable all interrupts 

   while(1) // endless loop
   {
      enable_interrupts(int_rda); // enable rda interrupt 
   }
}

#include <16F877.h>
#device adc=10
#use delay(clock=4000000)
#include <LCD.C>
#use rs232(baud=9600, xmit=pin_c6, rcv=pin_c7, bits=8, parity=N)
//#define use_lcd_portb true

void main() {
   int16 q;
   float p;
   
 
  setup_psp(PSP_DISABLED);        // PSP 
  setup_timer_1(T1_DISABLED);     // T1 
  setup_timer_2(T2_DISABLED,0,1); // T2 
  setup_CCP1(CCP_OFF);            // CCP1 
  setup_CCP2(CCP_OFF);            // CCP2 
 
   setup_adc_ports(AN0);
   setup_adc(ADC_CLOCK_INTERNAL);//enables the a/d module and sets the clock to internal adc clock
     
   lcd_init();
   for (;;) {
      set_adc_channel(0);//the next read_adc call will read channel 0
      delay_us(10);//a small delay is required after setting the channel
      
      q = read_adc();//starts the conversion and reads the result
      
      p = 5.0 * q / 1024.0;
      //for LCD
      printf(lcd_putc, "\fADC = %4ld", q);
      printf(lcd_putc, "\nVoltage = %01.2fV", p);
      //for RS232
      printf("ADC = %4ld ", q);
      printf("Voltage = %01.2fV\r", p);  // 
      
      delay_ms(200);
      }
}

/******************************************************
 Application Name: Display Counter 0,1,2,3.....F 
 *******************************************************/

#include <16f877.h>     // Microcontroller device 
#use delay(clock=4000000)   // Oscillator frequency used for delay function

int8 i;  // Declare 8-bit variable named i .

// Data values for common cathode 7segment display unit 0 , 1 , ...., F
const int digit[16]={0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7C, 0x07, 0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71};

/********* MAIN FUNCTION ********/

void main ()
{
   
   output_b(0x00);  // Port B Initial value = 0 
   output_a(0x02);  // Pin RA1 at logic 1 , the other pins at logic 0 , cathode on 

   while(true)   // infinite loop
   {
      for(i=0;i<=15;i++) // Repeat 16 times , for loop
      {
         output_b(digit[i]); //Eeach time :Array elemene digits [i] value Send to port B
         delay_ms(500);      // Wait for 500 ms
      }
   }
}