rcsim opened a new pull request, #15861:
URL: https://github.com/apache/nuttx/pull/15861
## Summary
This PR adds support to GPIO Subsystem for STM32F401RC RS485 board.
## Impact
Users will be able to use GPIO subsystem, including adding GPIO as Output,
Input and Input with Interruption.
## Testing
- Select NSH or USBNSH Config.
- Use Menuconfig to enable CONFIG_DEV_GPIO and CONFIG_EXAMPLES_GPIO
- Build and load the firmware in the board
- Access NuttShell and use gpio command:
```
nsh> gpio -o 0 /dev/gpio1
Driver: /dev/gpio1
Output pin: Value=1
Writing: Value=0
Verify: Value=0
nsh> gpio -o 1 /dev/gpio1
Driver: /dev/gpio1
Output pin: Value=0
Writing: Value=1
Verify: Value=1
nsh> gpio /dev/gpio0
Driver: /dev/gpio0
Input pin: Value=0
nsh> gpio -w 1 /dev/gpio2
Driver: /dev/gpio2
Interrupt pin: Value=0
Verify: Value=1
```
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