[riot-notifications] [RIOT-OS/RIOT] cpu: fix returns of i2c_acquire and i2c_release (#10856)

Sebastian Meiling notifications at github.com
Thu Jan 24 09:55:12 CET 2019

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### Contribution description

This PR replaces `asserts` with `if` statements in `periph/i2c` for all CPUs to return proper error codes according to the API spec. The rational behind this is that (theoretically) one could write a driver and simply link against RIOT without recompiling the `periph/i2c`, hence `asserts` will not work but according to the API specs `acquire` and `release` should return `-1` on error, which in this case mostly means: wrong device

### Testing procedure

run `tests/periph_i2c` (or any drivers requiring I2C) for different boards to match all CPUs, it should still work.

### Issues/PRs references

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * cpu/atmega: fix return of i2c_acquire/release
  * cpu/efm32: fix return of i2c_acquire/release
  * cpu/kinetis: fix return of i2c_acquire/release
  * cpu/nrf51: fix return of i2c_acquire/release
  * cpu/nrf52: fix return of i2c_acquire/release
  * cpu/sam0: fix return of i2c_acquire/release
  * cpu/stm32: fix return of i2c_acquire/release

-- File Changes --

    M cpu/atmega_common/periph/i2c.c (18)
    M cpu/efm32/periph/i2c.c (27)
    M cpu/kinetis/periph/i2c.c (25)
    M cpu/nrf51/periph/i2c.c (18)
    M cpu/nrf52/periph/i2c.c (25)
    M cpu/sam0_common/periph/i2c.c (16)
    M cpu/stm32_common/periph/i2c_1.c (25)
    M cpu/stm32_common/periph/i2c_2.c (35)

-- Patch Links --


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