Zilog EZ80F91AZA Manual de usuario descargar pdf (Pagina 36)

UM007518-1211

Zilog Real-Time Kernel: eZ80

CPU

User Manual

Q: I have two devices, TIMER1 and UART1. I don't want to miss the Interrupts of either

device and want to handle both of them. How can I do it using RZK? Is it possible to get

nested interrupts in RZK? If so, what precautions do I need to take so that nothing goes

wrong?

A: First, install the interrupt handler for both the devices and then initialize the devices.

RZK is designed to support nested interrupts for different devices. To include nested inter-

rupts, make sure you have enabled the interrupts after the

RZKIsrProlog() API is called

in the ISR. Take the precaution to include enough time to service the interrupt and to exe-

cute the thread code. If an interrupt routine needs to be nested, it is usually because there

are bursts of interrupts that have to be handled. A large buffer for the incoming data and a

larger stack size is also required.

Q: I regularly get an Uninitialized Interrupt message. What does this message

mean and why do I get it?

A: The message Uninitialized Interrupt specifies that one of your interrupt han-

dlers has not been initialized using

RZKInstallInterruptHandler() API. By default,

RZK installs a handler that prints the message

Uninitialized Interrupt and exe-

cutes a

HALT instruction.

Q: Why does the control not go to the highest priority thread, when I create it within the

main() API?

A: The main() function executes at the highest priority. It acts as a launch pad for the

application. The control is transferred to your application only after the

main() function

is executed completely. Although, you have assigned the highest priority to the thread that

you have created, make sure to select the

RZK_THREAD_AUTOSTART option for the opera-

tion mode of the thread. Otherwise, you must explicitly resume the thread by calling

RZKResumeThread() API.

Q: Do the binary semaphores, used for mutual exclusion, allow multiple locking by a

thread?

A: No. Binary semaphores are for mutual exclusion only and multiple locking by the

same thread is not allowed in RZK.

Q: Does RZK support callback functions, such as callouts in pSOS and hookups in

VxWorks?

A: Yes. However, the support is limited to the cleanup functions that are called when a

thread is deleted.

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