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PCD
How do I get getc() to timeout after a specified time?
GETC will always wait for a character to become available unless a timeout time is specified in
the #use rs232().
The following is an example of how to setup the PIC to timeout when waiting for an RS232
character.
#include <18F4520.h>
#fuses HS,NOWDT
#use delay(clock=20MHz)
#use rs232(UART1,baud=9600,timeout=500) //timeout = 500 milliseconds, 1/2
second
void main()
{
char c;
while(TRUE)
{
c=getc();
//if getc() timeouts 0 is returned to c
//otherwise receive character is returned to c
if(c) //if not zero echo character back
putc(c);
//user to do code
output_toggle(PIN_A5);
}
}
How do I make a pointer to a function?
The compiler does not permit pointers to functions so that the compiler can know at compile
time the complete call tree. This is used to allocate memory for full RAM re-use. Functions that
could not be in execution at the same time will use the same RAM locations. In addition since
there is no data stack in the PIC?, function parameters are passed in a special way that
requires knowledge at compile time of what function is being called. Calling a function via a
pointer will prevent knowing both of these things at compile time. Users sometimes will want
function pointers to create a state machine. The following is an example of how to do this
without pointers:
enum tasks {taskA, taskB, taskC};
run_task(tasks task_to_run) {
switch(task_to_run) {
case taskA : taskA_main();
case taskB : taskB_main();
case taskC : taskC_main();
break;
break;
break;
}
}
How do I put a NOP at location 0 for the ICD?
The CCS compilers are fully compatible with Microchips ICD debugger using MPLAB. In order
to prepare a program for ICD debugging (NOP at location 0 and so on) you need to add a
#DEVICE ICD=TRUE after your normal #DEVICE.
330
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