[riot-notifications] [RIOT-OS/RIOT] tests/driver_io1_xplained: remove printf_float dependency (#12136)

Alexandre Abadie notifications at github.com
Sun Sep 1 15:23:48 CEST 2019


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### Contribution description

This removes the `printf_float` dependency from the `tests/driver_io1_xplained` application. It was used to print the temperature measured by the extension which is returned as float by the driver.
Using the same arithmetic computation than the one in the sensor shell command works and allows removing this dependency.
This saves ~42% ROM usage (33256B before, 19604B now) and is fixing the CI issue raised by Murdock in #12025.

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### Testing procedure

This PR can be tested on IoT-LAB:
- Start an experiment:
```
$ iotlab-experiment submit -n test -d 60 -l saclay,samr21,1
```
- Build and flash
```
$ make IOTLAB_NODE=auto-ssh -C tests/driver_io1_xplained/ flash term
```
- Verify the temperature displayed is correct (compare against master)

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### Issues/PRs references

Will avoid to blacklist the nucleo-l031k6 board because of insufficient memory.

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

  https://github.com/RIOT-OS/RIOT/pull/12136

-- Commit Summary --

  * tests/driver_io1_xplained: remove printf_float dependency

-- File Changes --

    M tests/driver_io1_xplained/Makefile (1)
    M tests/driver_io1_xplained/main.c (5)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/12136.patch
https://github.com/RIOT-OS/RIOT/pull/12136.diff

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