[riot-notifications] [RIOT-OS/RIOT] periph/timer: Fix return codes of timer API (#12199)

Sebastian Meiling notifications at github.com
Wed Sep 11 14:04:27 CEST 2019


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### Contribution description

This PR changes the documentation of the periph/timer API to reflect most implementations, i.e., changing the return codes for `timer_set`, `timer_set_absolute`, and `timer_clear` to always use `0` on success instead of `1`. Rational is as follows: 
- most (if not all) C API commonly use `0` for success
- its confusing that `timer_init` returns `0` on success and `-1` on error, but other functions (see above) return `1` for success while still returning `-1` on error. So no bool logic could be used either. 
- most of our implementation already do this (bc. the original contributed assumed said default, or/and just didn't read the documentation)
- the impact of this change is minimal (or even none) for code in RIOT main tree, as return codes are hardly (or never) used - at least for the functions changed here.

### Testing procedure

run `tests/periph_timer` or any other timer test on your favourite board and verify it still works.

I will add a link to our HIL test results in the comments below, after this PR is open.

### Issues/PRs references

#4371
You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/12199

-- Commit Summary --

  * periph/timer: always return 0 for success
  * cpu/atmega_common: adapt timer to return 0 on success
  * cpu/cc2538: adapt timer to return 0 on success
  * cpu/cc26x0: adapt timer to return 0 on success
  * cpu/kinetis: adapt timer to return 0 on success
  * cpu/lm4f120: adapt timer to return 0 on success
  * cpu/lpc1768: adapt timer to return 0 on success
  * cpu/mips32r2: adapt timer to return 0 on success
  * cpu/native: adapt timer to return 0 on success
  * cpu/nrf5x: adapt timer to return 0 on success
  * cpu/sam0: adapt timer to return 0 on success
  * cpu/sam3: adapt timer to return 0 on success

-- File Changes --

    M cpu/atmega_common/periph/timer.c (2)
    M cpu/cc2538/periph/timer.c (4)
    M cpu/cc26x0/periph/timer.c (2)
    M cpu/kinetis/periph/timer.c (10)
    M cpu/lm4f120/periph/timer.c (4)
    M cpu/lpc1768/periph/timer.c (4)
    M cpu/mips32r2_common/periph/timer.c (6)
    M cpu/native/periph/timer.c (4)
    M cpu/nrf5x_common/periph/timer.c (4)
    M cpu/sam0_common/periph/timer.c (4)
    M cpu/sam3/periph/timer.c (2)
    M drivers/include/periph/timer.h (6)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/12199.patch
https://github.com/RIOT-OS/RIOT/pull/12199.diff

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