Answer / ashutosh tiwari

In Keil
void serial_ISR() interrupt 4 using 0
{
}

& in AVR studio
SIGNAL(Inteerupt_no)
{
}

hardware intterupt normally redirects the uC to predefined
addresses. In case of high end processors the interrupt
table will decide the interrupt vector address and whenever
intterrupt pin goes low, the table is searched for type and
source of interrupt.

What is another for creating a task without using taskspawn?

2 Answers  

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I have a situation where the programme counter(PC) shows that vxworks msgQreceive function has been called by task A and Q is full, still I am not picking up the messages. There is no other task registered to receive messages from this Q. The sending task B, which is ISR in this case, is getting timedout everytime it tries posting new message in it. A's state is PEND which means I am waiting for some resource to get free but PC shows I have called vxworks msgQReceive and currently at qJobget+0x018 location. There seems to be two causes now(identified by me): either vxworks qjobget task is not able to do semTake or no messages in Q. But Q is full and semTake failure seems unlikely(though I dont have a mechanism to check so). Besides explaining root cause for above, can anyone suggest how to get my task in READY state again? I also tried flushing the Q; on doing this, more messages get posted in Q but A still doesnt pick up any :(

4 Answers  

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what is task spawn in vxworks ?plz anyone explain me

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Which RTOS supports Non-Preemptive scheduling ? Why other scheduling methods are supported by such Oses?

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Assume there is a global variable & a static global variable.Both gets memory allocated from the data segment. Then how does the visiblity of static global varible gets limited to the file alone (in which it gets declared) ???

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Write a code to connect Hardware interrupt to ISR...?

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What is priority inversion?

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what are the various methods to overcome it?

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IN RTOS HAVING 1OKBYTES OF MEMORY AND YOUR PROGRAMM FOR ASKING FOR 5KBYTES AND YOU GOT NULL ERROR ? WHY DOES IT BEHAVES LIKE THIS

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what do u mean by Semaphore..when v wil go for using this..explain about hat.what is the difference betw..binary ,,counting and mutex semphores

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hi this is srikanth i need video classes for Vxworks any body having this forward me thanking u

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