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PCD
#USE
void
RS232(BAUD=9600, XMIT=PIN_B0, RCV=PIN_B1)
put_to_a( char c ) {
put(c);
}
char
get_from_a( ) {
return(getc()); }
#USE RS232(BAUD=9600, XMIT=PIN_B2,RCV=PIN_B3)
void put_to_b( char b ) {
putc(c);
}
main() {
char c;
put_to_a("Online\n\r");
put_to_b("Online\n\r");
while(TRUE) {
c=get_from_a();
put_to_b(c);
put_to_a(c);
}
}
The following will do the same thing but is more readable and is the recommended method:
#USE RS232(BAUD=9600, XMIT=PIN_B0, RCV=PIN_B1, STREAM=COM_A)
#USE RS232(BAUD=9600, XMIT=PIN_B2, RCV=PIN_B3, STREAM=COM_B)
main() {
char c;
fprintf(COM_A,"Online\n\r");
fprintf(COM_B,"Online\n\r");
while(TRUE) {
c = fgetc(COM_A);
fputc(c, COM_A);
fputc(c, COM_B);
}
}
How can the RB interrupt be used to detect a button press?
The RB interrupt will happen when there is any change (input or output) on pins B4-B7. There is
only one interrupt and the PIC? does not tell you which pin changed. The programmer must
determine the change based on the previously known value of the port. Furthermore, a single
button press may cause several interrupts due to bounce in the switch. A debounce algorithm
will need to be used. The following is a simple example:
#int_rb
rb_isr() {
byte changes;
changes = last_b ^ port_b;
last_b = port_b;
if (bit_test(changes,4 )&& !bit_test(last_b,4)){
//b4 went low
}
if (bit_test(changes,5)&& !bit_test (last_b,5)){
//b5 went low
328
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