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STM32 EXTIv1 driver.
Driver capability:
- Support for the EXTI peripheral.
The file registry must export:
STM32_EXTI_NUM_LINES - Number of EXTI lines, it can be between 0 and 63.
STM32_EXTI_IMR1_MASK - Mask of the fixed lines that must not be
handled by the driver (0..31).
STM32_EXTI_IMR2_MASK - Mask of the fixed lines that must not be
handled by the driver (32..63). Only required
if STM32_EXTI_NUM_LINES is greater than 32.
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