wip: usb

[kienvo]

Resolves #15

Summary by Sourcery

Add RV003USB submodule with configuration headers and demo code, update build to compile the USB stack and disable the original SystemInit to prepare for custom USB initialization.

New Features:

• Integrate RV003USB library and demo HID API to enable USB functionality

Enhancements:

• Disable the default SystemInit to allow custom initialization for USB support

Build:

• Extend the Makefile to include external rv003usb C/ASM sources, include paths, and remove unused src/main.c

Chores:

• Add usb_config.h and funconfig.h for USB and system configuration

[sourcery-ai]

Reviewer's Guide

This PR integrates USB support by incorporating the external rv003usb library—adjusting the build and include paths, disabling conflicting clock initialization, and providing configuration headers for USB endpoints and descriptors.

Class diagram for USB descriptor configuration structures

classDiagram
    class usb_string_descriptor_struct {
        +uint8_t bLength
        +uint8_t bDescriptorType
        +uint16_t wString[]
    }
    class descriptor_list_struct {
        +uint32_t lIndexValue
        +const uint8_t *addr
        +uint8_t length
    }
    usb_string_descriptor_struct <.. descriptor_list_struct : used in

Loading

File-Level Changes

Change	Details	Files
Disabled default system clock initialization	Comment out SystemInit definition Remove call to SetSysClock Prevent automatic RCC register resets	src/mcu/ch32v00x-sys.c
Integrated external rv003usb library into build	Remove src/main.c from build sources Add C and assembly sources from external/rv003usb Extend include paths for USB headers	Makefile
Added USB configuration header	Define endpoint counts and GPIO pins Configure HID report and descriptors Provide string and descriptor list structures	inc/usb_config.h
Added project-wide function configuration header	Enable debug printf support Set MCU and systick options	inc/funconfig.h
Initialized external USB submodule	Create .gitmodules entry Add external/rv003usb directory placeholder	.gitmodules external/rv003usb

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#15	Enable the firmware to receive input over USB.	✅
#15	Support communication with external systems such as PCs via USB	✅

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