Hello Xavier,
Am 04.07.2014 11:18, schrieb Xavier LEBARS:
Hello,
Thanks for the answer, we can display Hello World only once. (I resend my message because I forgot to add the L4 mailing list ...)
the Hello World example calls sleep(1) which causes the kernel to suspend the task for one second until the next line is printed. This delay period is derived from the fiasco system clock. The system clock needs periodically increased. Usually a hardware timer is configured to periodically generate (hardware-)interrupts at a rate of 1000 Hz. And every time the interrupt handler of the timer is triggered, it calls a function in the kernel to increase the system clock. See the the last line in timer-arm-realview.cpp where Kip::k()->clock; is called.
If your system clock is not advanced, the sleep(1) will never return.
We still have another questions. What kind of interrupts are you talking about ? Which module should actually throw this interrupt and when ?
In the bsp you have to add support for the hardware-timers of your SOC, configure one channel for 1000Hz and make sure that the timer interrupts are routet to the interrupt handler.
Best regards Martin