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raspberrypi.h
If the raspberrypi.h has been included without preceding inclussion
of bsp.h then BSP_IS_RPI2 has not been set for Raspberry Pi 2
BSP variant and bad things happen later.
The patch includes bspopts.h by raspberrypi.h and even includes
bsp.h in critical peripherals support.
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This is required if function or direction is changed by some driver
after start of thread multitasking or in interrupts drivers.
There can be problem with calling GPIO function selection before
data section is initialized. But actual ticket lock implementation
seems to be compatible even with memory initialized to zero oven
on SMP.
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Original implementation does only bitwise-or with previous register
value for all functions except IN. Switch from one to other function
would lead to incorrect value.
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Rename rtems_bsp_select_specific_io to rtems_gpio_bsp_select_specific_io.
Should've gone with 5c337d7. Fixes #2456.
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Closes #2435.
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makes rtems_gpio_bsp_get_value return uint32_t. Motivation: simplify
beagle gpio implementation for common gpio apio.
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Added support for the new RTEMS GPIO API functions.
Test cases can be found in https://github.com/asuol/RTEMS_rpi_testing/tree/master/GPIO
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