Hello, yorknh,
Thank you for your patience and for taking the time to make this post, here is an update,
The timer adapter abstraction layers for LPTMR, FTM, and PIT, of SDK, share public functions, in example the HAL_TimerInit() that you mentioned, and only one of them is intended to be included in a project, others have to be removed.
This is explained further in the timer.h file, which is located in SDK 2.7.0 of FRMD-K64F
*!
* @brief The timer adapter component
*
* The timer adapter is built based on the timer SDK driver provided by the NXP
* MCUXpresso SDK. The timer adapter could provide high accuracy timer for user.
* Since callback function would be handled in ISR, and timer clock use high
* accuracy clock, user can get accuracy millisecond timer.
*
* The timer adapter would be used with different HW timer modules like FTM, PIT, LPTMR.
* But at the same time, only one HW timer module could be used. On different platforms, different
* HW timer module would be used. For the platforms which have multiple HW timer modules,
* one HW timer module would be selected as the default, but it is easy to change the default
* HW timer module to another. Just two steps to switch the HW timer module:
* 1.Remove the default HW timer module source file from the project
* 2.Add the expected HW timer module source file to the project.
* For example, in platform FRDM-K64F, there are two HW timer modules available, FTM and PIT.
* FTM is used as the default HW timer, so ftm_adapter.c and timer.h is included in the project by
* default. If PIT is expected to be used as the HW timer, ftm_adapter.c need to be removed from the
* project and pit_adapter.c should be included in the project
*/
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