What would be an efficient, low latency way to reflect the state of an input pin onto an output pin?
Is there anything more automated than configuring the input pin as an EXTI, then in the interrupt handler, reading it and setting the state of the output pin accordingly? Could it be done with a comparator or timer?
A couple of other ideas
STM32L1 Routing Interface. These are analog switches intended for touch sensing. Activating two switches in one "touch group" connects the two pins internally.
Timer + DMA to GPIO. Works when DMA is able to write the GPIO registers, target can be any pin. E.g. on STM32F4, TIM1 or TIM8 Channel 1 triggers on TI1 rising edge, Channel 2 on falling edge. They can be assigned to different channels on DMA2. One DMA channel copies the pin set mask, the other one the pin reset mask to GPIOx->BSRR.
SPI with DMA to itself, when you need a specific delay. This again needs a DMA that can copy to/from anywhere. SPI in master mode, RX complete DMA request copies the value in the data register back to itself, creating a true shifter. STM32H7 SPI controller can do it by itself without DMA.
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