threaded irq in user space #111
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By default, irq handler is _undefined_handler. Therefore, for an irq, we can compare _undefined_handler and its value of vector table to identify if there is specific handler for this irq.
Interrupt handler now could be defined as thread in user space. Kernel provides ipc to register handler thread and notify this handler when interrupt happens.
EXTI interrupt could be controlled by software. Therefore, it is very suitable to demo and test user thread irq.
RM0090 Reference manual STM32F405xx, STM32F407xx, STM32F415xx and STM32F417xx advanced ARM-based 32-bit MCUs page.65
The schedule priority of ipc is higher than thread creation. If ipc is too busy like ping-pong test, there is no chance to do thread creation. Therefore, we should add sleep funtion in pong thread to avoid this starvation.
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Implement threaded irq in user space by IPC and provide example test case for this feature