RTEMS | atsam/contrib: Address function cast warnings (!895)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/895

Project:Branches: joel/rtems:fix-atsam-function-casts to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill



## Summary

atsam/contrib: Address function cast warnings

The DMA interrupt handlers for multiple drivers took two parameters
but the signature expected by the registration function assumed the
handlers had three parameters. The solution was to conditionally add
a third parameter (ignored) and mark it with RTEMS_UNUSED.

For the UART and USART drivers, there was a type defined for the
handler which included the incorrect signature. Changed to use the
DMA handler type.


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