Add a new set_direction() method to change the I/O direction register to the KTS1622 class.

Description

Motivation and Context

The EN_USB_PLG is controlled by the right KTS1622 I/O expander P1_4 on the proto1 sample. During the UM3506 FW update, this pin outputs the same value as the EN_USB_PLG_UM pin to prevent the UM3506 bootloader from losing control and causing USB MUX malfunctions (USB REC/PLUG miss-switching). The I/O direction register needs to be changed at the EN_USB_PLG_UM port level read and at the EN_USB_PLG port output.

This new set_direction() method is used in the following function: [FIR-137] Ability to update UM3506 FW from ESP32

199

How has this been tested?

I confirmed that the following um3506_example.cpp code reads the value of the EN_USB_PLG_UM port and outputs it from the EN_USB_PLG port.

I also confirmed that the following proto1.cpp code reads the value of the EN_USB_PLG_UM port and outputs it from the EN_USB_PLG port.

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

Types of changes

[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] Documentation Update
[ ] Hardware (schematic, board, system design) change
[x] Software change

Checklist:

[ ] My change requires a change to the documentation.
[ ] I have added / updated the documentation related to this change via either README or WIKI

Software

[ ] I have added tests to cover my changes.
[ ] I have updated the .github/workflows/build.yml file to add my new test to the automated cloud build github action.
[x] All new and existing tests passed.
[x] My code follows the code style of this project.

Hardware

[ ] I have updated the design files (schematic, board, libraries).
[ ] I have attached the PDFs of the SCH / BRD to this PR
[ ] I have updated the design output (GERBER, BOM) files.

esp-cpp / espp

feat(kts1622) Add new set_direction method to change I/O direction register #247