fa1fee0a5f
Complete the khci -> chipidea ci_fs migration that was started for device
(commit d70403f1f "host is not yet"):
- device: switch kinetis_k/kl/k32l (Makefiles + k32l CMake) to dcd_ci_fs.c
- host: add hcd_ci_fs.c (port of hcd_khci.c onto ci_fs_regs_t) and switch all
Kinetis families to it; remove src/portable/nxp/khci entirely
- enable host examples (device_info, cdc_msc_hid) for mcu:KINETIS_K
- README: merge the KL and K32L2 rows into a single "KL, K32L" ci_fs row
hcd_ci_fs.c also fixes two pre-existing host bugs found via HIL on frdm_k64f
(present in the old hcd_khci.c too):
- data toggle was flipped on a NAK in suspend_transfer; a NAK transfers no
data so the toggle must be preserved, else the retried bulk packet is
silently discarded by the device (MSC CBW/CSW hang). See comment in file.
- prepare_packets asserted and dropped a transfer when the single shared BDT
was still owned by an in-flight transfer under concurrent activity; now it
returns busy and resume_transfer defers/retries on the next SOF.
HIL verified on frdm_k64f: device 13/13, host cdc_msc_hid (CDC mount + echo +
MSC mount, through a hub).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ExGPLP5eU43LR7o6yYLpNi
Host: CDC/MSC/HID
A USB host example that enumerates CDC serial, Mass Storage, and HID devices and reports their activity over the debug UART.
What it does
- CDC (
CFG_TUH_CDC): bidirectionally bridges the debug console and the attached CDC serial device — bytes typed on the debug UART are written to the device, and bytes received from the device are echoed back to the UART. Also supports common USB-serial adapters (FTDI, CP210x, CH34x, PL2303). On mount it prints the interface info and line coding (set to 115200 8N1 on enumeration). - MSC (
CFG_TUH_MSC): on mount, issues a SCSI Inquiry and prints the drive's vendor/product/revision strings and its capacity (block count, block size, total MB). - HID (
CFG_TUH_HID): receives reports and prints keyboard keystrokes as ASCII, mouse button state and cursor movement, and any other (generic) report as raw hex. - Blinks the board LED once per second.
Requirements
The board must support USB host mode (provide VBUS to the connected device); some boards need an external USB-A port / host adapter.
Configuration
Notable tusb_config.h settings:
#define CFG_TUH_ENABLED 1
#define CFG_TUH_HUB 1
#define CFG_TUH_DEVICE_MAX (3*CFG_TUH_HUB + 1)
#define CFG_TUH_CDC 1
#define CFG_TUH_CDC_FTDI 1
#define CFG_TUH_CDC_CP210X 1
#define CFG_TUH_CDC_CH34X 1
#define CFG_TUH_CDC_PL2303 1
#define CFG_TUH_HID (3*CFG_TUH_DEVICE_MAX)
#define CFG_TUH_MSC 1
#define CFG_TUH_HID_EPIN_BUFSIZE 64
#define CFG_TUH_HID_EPOUT_BUFSIZE 64
#define CFG_TUH_CDC_LINE_CONTROL_ON_ENUM (CDC_CONTROL_LINE_STATE_DTR | CDC_CONTROL_LINE_STATE_RTS)
#define CFG_TUH_CDC_LINE_CODING_ON_ENUM { 115200, CDC_LINE_CODING_STOP_BITS_1, CDC_LINE_CODING_PARITY_NONE, 8 }
Building
CMake:
mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .
Make:
make BOARD=raspberry_pi_pico all
FreeRTOS variant
A FreeRTOS build is in examples/host/cdc_msc_hid_freertos — identical CDC/MSC/HID host behavior, running the host stack in a FreeRTOS task with a software-timer LED.
How to use
Plug a USB keyboard, mouse, flash drive, or serial device into the board's USB host port (a USB hub also works, so several can be connected at once). Watch the debug UART: keystrokes and mouse movement appear as you use the input devices, an attached flash drive prints its inquiry/size info, and for a serial device you can type into the debug console to forward characters to it and see its output echoed back.