/**
* The first protothread function. A protothread function must always
* return an integer, but must NEVER explicitly return - returning is
* performed inside the protothread statements.
*
* The protothread function is driven by the main loop further down in
* the code.
*/
static PT_THREAD (protothread1(struct pt *pt))
{
// mark beginning of thread
PT_BEGIN(pt);
/* We loop forever here. */
while(1) {
//stop until thread 2 signals
PT_SEM_WAIT(pt, &control_t1);
// put a 2 microsec pulse on the debug pin with amplitude 3
PT_DEBUG_VALUE(3, 2) ;
// toggle a port pin
mPORTAToggleBits(BIT_0);
// tell thread 2 to go
PT_SEM_SIGNAL(pt, &control_t2);
// Allow thread 3 to control blinking
// thru command interface
PT_YIELD_UNTIL(pt, cntl_blink) ;
// This is a locally written macro using timer5 to count millisec
// to program a yield time
PT_YIELD_TIME_msec(wait_t1) ;
// NEVER exit while
} // END WHILE(1)
// mark end the thread
PT_END(pt);
} // thread 1
static
PT_THREAD(producer(struct pt *pt))
{
static int produced;
PT_BEGIN(pt);
for(produced = 0; produced < NUM_ITEMS; ++produced) {
PT_SEM_WAIT(pt, &full);
add_to_buffer(produce_item());
PT_SEM_SIGNAL(pt, &empty);
}
PT_END(pt);
}
static
PT_THREAD(consumer(struct pt *pt))
{
static int consumed;
PT_BEGIN(pt);
for(consumed = 0; consumed < NUM_ITEMS; ++consumed) {
PT_SEM_WAIT(pt, &empty);
consume_item(get_from_buffer());
PT_SEM_SIGNAL(pt, &full);
}
PT_END(pt);
}
// === Thread 2 ======================================================
//
static PT_THREAD (protothread2(struct pt *pt))
{
PT_BEGIN(pt);
while(1) {
//stop until thread 1 signals
PT_SEM_WAIT(pt, &control_t2);
// put a 5 microsec pulse on the debug pin with amplitude 6
PT_DEBUG_VALUE(6, 5) ;
// toggle a port
mPORTAToggleBits(BIT_1);
// tell thread 1 to go
PT_SEM_SIGNAL(pt, &control_t1);
// NEVER exit while
} // END WHILE(1)
PT_END(pt);
} // thread 2
