#include <pic.h>
#use delay(clock=20000000)
#fuses hs,nowdt,nolvp,noprotect
#byte portb=6
#byte portc=7
#use rs232(baud=9600,xmit=pin_c6,rcv=pin_c7, parity=n)
int mystatus=0; //here can't declare byte coz not detected by compiler
char mydata;
void main()
{
int count=0;
set_tris_c(0b10001000); //here c6 must be 0, c7 must be 1 (input)
printf("Enter your character : A or S or Z or X");
while(true)
{
if(kbhit()) //monitor incoming charactor from RS232
{
mydata=toupper(getch()); //receive charactor dan save in mydata
printf("\n\rYou entered: %c",mydata); //display on hyper terminal
count++;
mystatus=1;
}
if (mystatus==1)
{
if(mydata=='A')
{ output_high(pin_c4);} //led on
if (mydata=='S')
{ output_low(pin_c4);} //led off
if (mydata=='Z')
{ output_high(pin_c1);} //buzzer on
if (mydata=='X')
{ output_low(pin_c1);} //buzzer off
mystatus=0;
}//end if
}//end while
}//end void main
Explanation some Program Code:-
- Toupper ()
Toupper () is special function to
convert input lowercase letter to uppercase letter. If the input data is ‘a’ so
that the toupper () will convert the character to uppercase ‘A’.
- Kbhit ()
Kbhit () is use to check or monitor the incoming
character from hardware RS232. When a key is pressed, this function will
returns to true or non-zero. When nothings pressed, kbhit () will returns false
or zero.
- Getch ()
Getch
() is returns an 8-bit character. This function is to gets a single-byte
(8-bit) character from the terminal. This functions only allow a single
character as an input from hardware RS232 to the PIC 16F877A.
