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Example Programs
#task(rate=500ms,max=100ms,queue=2)
void The_second_rtos_task ( );
void The_first_rtos_task ( ) {
int count=0;
// rtos_yield allows the user to break out of a task at a given point
// and return to the same ponit when the task comes back into context
while(TRUE){
count++;
rtos_msg_send(The_second_rtos_task,count);
rtos_yield ( );
}
}
void The_second_rtos_task ( ) {
if(rtos_msg_poll( ))
{
printf("count is : %i\n\r",rtos_msg_read ( ));
}
}
void main ( ) {
rtos_run();
}
/////////////////////////////////////////////////////////////////
///
This file demonstrates how to use the real time
///
///
///
///
operating systems yield function signal and wait
function to handle resources
///
///
///
///
this demo makes use of the PIC18F452 prototyping board
///
/////////////////////////////////////////////////////////////////
#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms)
// a semaphore is simply a shared system resource
// in the case of this example, the semaphore will be the red LED
int8 sem;
#define RED PIN_B5
#task(rate=1000ms,max=100ms,queue=2)
void The_first_rtos_task ( );
#task(rate=1000ms,max=100ms,queue=2)
void The_second_rtos_task ( );
void The_first_rtos_task ( ) {
int i;
// this will decrement the semaphore variable to zero which signals
// that no more user may use the resource
rtos_wait(sem);
for(i=0;i<5;i++){
output_low(RED); delay_ms(20); output_high(RED);
rtos_yield ( );
}
// this will inrement the semaphore variable to zero which then signals
// that the resource is available for use
rtos_signal(sem);
}
void The_second_rtos_task ( ) {
361
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