STM32 L0: Add Flash API support

[LMESTM]

Description

This PR contains the flash API implementation for L0 STM32 family.

Status

READY

Steps to test or reproduce

Test report on L073RZ

+-----------------------+---------------+-----------------------------+-------------------------------+--------+--------+--------+--------------------+
| target                | platform_name | test suite                  | test case                     | passed | failed | result | elapsed_time (sec) |
+-----------------------+---------------+-----------------------------+-------------------------------+--------+--------+--------+--------------------+
| NUCLEO_L073RZ-GCC_ARM | NUCLEO_L073RZ | tests-mbed_drivers-flashiap | FlashIAP - init               | 1      | 0      | OK     | 0.05               |
| NUCLEO_L073RZ-GCC_ARM | NUCLEO_L073RZ | tests-mbed_drivers-flashiap | FlashIAP - program            | 1      | 0      | OK     | 3.53               |
| NUCLEO_L073RZ-GCC_ARM | NUCLEO_L073RZ | tests-mbed_drivers-flashiap | FlashIAP - program errors     | 1      | 0      | OK     | 0.06               |
| NUCLEO_L073RZ-GCC_ARM | NUCLEO_L073RZ | tests-mbed_hal-flash        | Flash - buffer alignment test | 1      | 0      | OK     | 0.59               |
| NUCLEO_L073RZ-GCC_ARM | NUCLEO_L073RZ | tests-mbed_hal-flash        | Flash - clock and cache test  | 0      | 1      | FAIL   | 0.37               |
| NUCLEO_L073RZ-GCC_ARM | NUCLEO_L073RZ | tests-mbed_hal-flash        | Flash - erase sector          | 1      | 0      | OK     | 0.16               |
| NUCLEO_L073RZ-GCC_ARM | NUCLEO_L073RZ | tests-mbed_hal-flash        | Flash - init                  | 1      | 0      | OK     | 0.3                |
| NUCLEO_L073RZ-GCC_ARM | NUCLEO_L073RZ | tests-mbed_hal-flash        | Flash - mapping alignment     | 1      | 0      | OK     | 0.06               |
| NUCLEO_L073RZ-GCC_ARM | NUCLEO_L073RZ | tests-mbed_hal-flash        | Flash - program page          | 1      | 0      | OK     | 0.52               |
+-----------------------+---------------+-----------------------------+-------------------------------+--------+--------+--------+--------------------+

Note: The tests-mbed_hal-flash | Flash - clock and cache test most of the time fails but this has nothing to do with Flash programming. There seems to be timer variations of 0.2% over time compared to 0.1% target, which needs to be investigated but also happens without flash programming.

L073RZ actually the only mbed-os5 target, so no tests can be run on other targets

[0xc0170]

Note: The tests-mbed_hal-flash | Flash - clock and cache test most of the time fails but this has nothing to do with Flash programming. There seems to be timer variations of 0.2% over time compared to 0.1% target, which needs to be investigated but also happens without flash programming.

Interesting, we might want o write more ticker tests :)

[sg-]

/morph test-nightly

[mbed-bot]

Result: FAILURE

Your command has finished executing! Here's what you wrote!

/morph test-nightly

[bridadan]

/morph test-nightly

[mbed-bot]

Result: FAILURE

Your command has finished executing! Here's what you wrote!

/morph test-nightly

Output

mbed Build Number: 1880

Test failed!

[0xc0170]

@LMESTM Don't forget to look at the timer issue mentioned above

[adustm]

Hello @0xc0170 @screamerbg @sg-
This PR has been merged 27 days ago, in the workshop branch.
Could you let us know when we will be able to see it in the master branch ?

Kind regards
Armelle