patacongo edited a comment on issue #2862:
URL:
https://github.com/apache/incubator-nuttx/issues/2862#issuecomment-781015790
> So I need to create a Sam_gpio.c file that calls Sam_configgpio() for each
of the pins I need to use. Is this the "lower half" driver?
That is only part of what you have to do. You need to create a lower half
driver that implements the interface defined include/nuttx/ioexpander/gpio.h
and then you need to call gpio_pin_register() to register the GPIO driver. It
looks like there may be examples here:
boards/arm/imxrt/imxrt1020-evk/src/imxrt_gpio.c
boards/arm/imxrt/imxrt1050-evk/src/imxrt_gpio.c
boards/arm/imxrt/imxrt1060-evk/src/imxrt_gpio.c
boards/arm/samd5e5/metro-m4/src/sam_gpio.c
boards/arm/stm32/nucleo-f429zi/src/stm32_gpio.c
boards/arm/stm32/stm32f103-minimum/src/stm32_gpio.c
boards/arm/stm32f0l0g0/nucleo-g070rb/src/stm32_gpio.c
boards/arm/stm32f7/nucleo-144/src/stm32_gpio.c
boards/arm/stm32h7/nucleo-h743zi/src/stm32_gpio.c
boards/arm/stm32l4/nucleo-l432kc/src/stm32_gpio.c
boards/arm/stm32l4/nucleo-l476rg/src/stm32_gpio.c
boards/risc-v/bl602/bl602evb/src/bl602_gpio.c
boards/sim/sim/sim/src/sim_gpio.c
boards/xtensa/esp32/esp32-wrover-kit/src/esp32_gpio.c
The example you are looking at just configures some gpio hardware pins, it
does not set up the gpio driver.
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