24 lines
1.2 KiB
Plaintext
24 lines
1.2 KiB
Plaintext
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STM32 EXT driver implementation through EXTI unit.
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There are several kind of EXTI lines:
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1) GPIO lines. Always in range 0..15, always handled by the EXT driver.
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2) Configurable peripheral events not shared, always handled by the EXT driver.
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3) Configurable peripheral events shared with other, non EXTI, interrupts.
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The EXTI driver declares the ISR and has to call the IRQ handler of the
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other driver.
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4) Direct lines (1 in IMR register after reset). The EXTI driver never touches
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the default configuration for direct lines and does not declare ISRs.
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5) Unused lines. The EXTI driver does not declare ISRs.
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The file registry must export:
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STM32_EXTI_NUM_LINES - Range of configurable lines, it can have holes of
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unused or direct lines. Configurable line numbers go
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from 0 to STM32_EXTI_NUM_LINES-1.
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STM32_EXTI_IMR_MASK - Direct lines and unused lines marked as 1 in this
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mask, configurable lines marked as 0.
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STM32_EXTI_IMR2_MASK - Optional, for lines 32...63.
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ISRs are not declared inside the driver, each sub-family must have its own
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ext_lld_isr.h and ext_lld_isr.c files.
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