ex_rtos_demo_5_yield.c

来自「PIC单片机从SPI」· C语言 代码 · 共 49 行

/////////////////////////////////////////////////////////////////////////
////                     ex_rtos_demo_5_yield.C                      ////
////                                                                 ////
////  This file demonstrates how to use the real time operating      ////
////  rtos_yield function.                                           ////
////                                                                 ////
/////////////////////////////////////////////////////////////////////////
////        (C) Copyright 1996,2003 Custom Computer Services         ////
//// This source code may only be used by licensed users of the CCS  ////
//// C compiler.  This source code may only be distributed to other  ////
//// licensed users of the CCS C compiler.  No other use,            ////
//// reproduction or distribution is permitted without written       ////
//// permission.  Derivative programs created using this software    ////
//// in object code form are not restricted in any way.              ////
/////////////////////////////////////////////////////////////////////////

#include <18F452.h>
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
#use rtos(timer=0,minor_cycle=100ms)

#task(rate=1000ms,max=100ms,queue=2)
void The_first_rtos_task ( );

#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();
}