ch32: Add usbd peripheral

[Grazfather]

No description provided.

[Copilot]

Copilot review overview

🟡 Changes recommended

PMA sizing, control-transfer handling, GPIO clocking, and board UART initialization contain functional defects.

Review effort: Balanced
Findings: 3 · 1

Open (4)

• Round RX buffer sizes up to whole PMA blocks · New
• Clear stale TX flags before handling new SETUP requests · New
• Enable GPIO clocks before configuring disconnect pins · New
• Use board.uart_setup to initialize logger pins · New

What changed in this PR

Adds a selectable PMA-based USBD backend for CH32V203 boards while standardizing USB setup APIs.

Changes:

• Implements the USBD driver, clock setup, and board-level selection.
• Updates USBFS/USBHS to the uniform Setup API.
• Adds LANA TNY USB CDC support and board configuration.

File	Description
port/​wch/​ch32v/​src/​hals/​usbhs.zig	Adopts uniform USB setup API.
port/​wch/​ch32v/​src/​hals/​usbfs.zig	Adopts uniform USB setup API.
port/​wch/​ch32v/​src/​hals/​usbd.zig	Implements PMA-based USBD backend.
port/​wch/​ch32v/​src/​hals/​clocks.zig	Adds USBD clock configuration.
port/​wch/​ch32v/​src/​hals/​ch32v20x.zig	Selects USB backend by board.
port/​wch/​ch32v/​src/​boards/​Suzuduino_Uno_V1b.zig	Adds USB and UART setup.
port/​wch/​ch32v/​src/​boards/​nanoCH32V203.zig	Adds USB setup.
port/​wch/​ch32v/​src/​boards/​LANA_TNY.zig	Selects and initializes USBD.
port/​wch/​ch32v/​src/​boards/​CH32V307V-R1-1v0.zig	Adds USB and UART setup.
examples/​wch/​ch32v/​src/​usb_cdc.zig	Uses board USB setup.
examples/​wch/​ch32v/​build.zig	Adds LANA TNY CDC target.

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[Copilot]

Copilot review overview

🟡 Changes recommended

Shared receive staging can corrupt unread packets, and odd-sized PMA allocations can misalign subsequent endpoint buffers.

Review effort: Balanced
Findings: 2

Open (2)

• Preserve OUT data until ep_readv consumes it · New
• Round PMA buffer allocations to even byte counts · New

Resolved since last review (4)

• Enable GPIO clocks before configuring disconnect pins
• Clear stale TX flags before handling new SETUP requests
• Round RX buffer sizes up to whole PMA blocks
• Use board.uart_setup to initialize logger pins

[Grazfather]

Note that I re-tested on my LANA_TNY after these fixes today.

[Copilot]

Copilot review overview

🔵 Needs a closer look

The new hardware backend’s PMA, register-toggle, and clock behavior requires validation on the target device.

Review effort: Balanced
Findings: 1

Open (1)

• Preserve OUT data until ep_readv consumes it

Resolved since last review (1)

• Round PMA buffer allocations to even byte counts