<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=151967" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/mrusme">@mrusme</a> This PR is a duplicate of #PR 10556 which is waiting since December last year for merge. Please try to search for existing PRs before you start new developments. I invested a lot of time into the development of the PCA9685 driver. Even though PR <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="388113694" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/10556" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/10556/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/10556">#10556</a> can use the PWM extension API proposed in #PR 10533, it does not depend on it.</p>
<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=1301112" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/benpicco">@benpicco</a> I would suggest to close this PR since it is a duplicate and to review PR <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="388113694" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/10556" data-hovercard-type="pull_request" data-hovercard-url="/RIOT-OS/RIOT/pull/10556/hovercard" href="https://github.com/RIOT-OS/RIOT/pull/10556">#10556</a>.<br>
Furthermore, there is an agreement that APIs of extenders should be as identical as possible to the API in <code>periph/pwm.h</code> That is, they have to implement exactly the same functions. This is not the case in this PR.</p>

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