For stm32f4discovery

[southernbear]

Filling functions to enable standard input, timer, and low power mode.
Besides, fix error of exiting a thread.

• Implements hardware timer using TIM2 with capture and compare.
• Implements sleep mode with WFI.
• Implements stdin with USART2 (uart initialization codes are in thirdparty_board repository).
• Make all context switch operating in PendSV.

[OlegHahm]

Merged into new branch.(southernbear-master). Will merge into master after testing.

[OlegHahm]

@haukepetersen, could you test this?

[haukepetersen]

Yes, can do, but will take a moment... For now: there are no copyright headers and doxygen doku in most of the files, that would have to be fixed anyhow...

Also: Are there any existing test projects, especially for the real-time clock?

[OlegHahm]

There are shell commands for the RTC, but you need to define an rtc module for this CPU.

[ghost]

Build triggered.

[ghost]

Build started.

[ghost]

Build finished.

[thomaseichinger]

@southernbear @haukepetersen
Regarding the future closing of this repository is this PR anyhow maintained?

[haukepetersen]

Hope it is... From a functionality point of view I think the LPM mode stuff ist still very interesting, the rest of the points (which should have been separate PRs anyhow..) are probably obsolete.

[OlegHahm]

Could we move this PR somehow to the main RIOT repo?

[ghost]

Can anyone ask me to verify this patch?

[miri64]

@RIOT-OS-Jenkins Test this please