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Tiny Threads - Tiny Multitasking Threads for Microcontrollers

• Idea based on http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html.
• Only 1 byte RAM needed per thread.
• Very small overhead context switching.

• Maximum 254 lines per thread.
• Thread context switching will not work within a switch block.

     TT_DEF(1)
     {
        TT_BEGIN(1);
     	while (1)
        {
           ...
           TT_SWITCH(1);
           ...
           ...
           TT_WAIT_UNTIL(1,keypress);
        }
        TT_END(1);
     }
     
     TT_DEF(LED_TASK)
     {
         TT_BEGIN(LED_TASK);
         while (1)
         {
             LedOn();
             delay=DELAY_1_SECOND;
             TT_WAIT_UNTIL(LED_TASK,delay==0);
             LedOff();
             delay=DELAY_1_SECOND;
             TT_WAIT_UNTIL(LED_TASK,delay==0);
         }
         TT_END(LED_TASK);
     }
      
     void main(void) 
     {
         ...
         ...
         while(1)
         {
             TT_SCHED(1);
             TT_SCHED(LED_TASK);
         }
     }

• tthread.h - header file for Tiny Threads. This is the only file needed to use Tiny Threads.
• tt_sample.zip - sample application using tthread. Compiles with PICC compiler.

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Please visit also my blog The Cebuano Geek. Here I will post my new codes and ideas.