USB self-loop: HS host writes bytes to a CDC-ACM device, reads the echo. More...

#include <stdint.h>
#include <string.h>
#include "ra8_board_ek_ra8d2.h"
#include "ra8_boot_entry.h"
#include "ra8_cgc.h"
#include "ra8_err.h"
#include "ra8_gpio_constants.h"
#include "ra8_isr.h"
#include "ra8_port_constants.h"
#include "ra8_port_utils.h"
#include "ra8_time.h"
#include "ra8_usb.h"
#include "usb_selftest_cdc_steps.h"
#include "tx_api.h"
#include "ux_api.h"
#include "ux_dcd_ra8_usb.h"
#include "ux_device_class_cdc_acm.h"
#include "ux_device_stack.h"

Include dependency graph for main.c:

Enumerations
enum	cdc_dev_step_t : uint32_t { k_cdc_dev_step_stack = 1U , k_cdc_dev_step_class = 2U , k_cdc_dev_step_dcd = 3U , k_cdc_dev_step_attach = 4U , k_cdc_dev_step_echo = 5U }
	J-Link probe values marking device-worker bring-up progress. More...
enum	usb_langid_byte_t : uint8_t { k_usb_langid_en_us_lo = 0x09U , k_usb_langid_en_us_hi = 0x04U }

Functions
void	_tx_timer_interrupt (void)
void	SysTick_Handler (void)
	Service the SysTick exception selected by the linked application.
static VOID	cdc_activate (VOID *cdc_instance)
	CDC-ACM activate callback.
static VOID	cdc_deactivate (VOID *cdc_instance)
	CDC-ACM deactivate callback.
static UINT	cdc_usbx_stack_up (void)
	Bring USBX system + device stack up with the CDC-ACM framework.
static UINT	cdc_class_register (void)
	Register the CDC-ACM class against configuration 1, interface 0.
static void	cdc_echo_iter (UCHAR *buf, ULONG cap)
	One device echo iteration: read a bulk-OUT chunk, write it back.
static VOID	cdc_device_worker (ULONG arg)
	Device-side worker: bring the CDC-ACM device up, then echo forever.
VOID	tx_application_define (VOID *first_unused_memory)
	ThreadX application-define hook.
static void	cdc_panic_halt (void)
	Halt forever in WFI – panic stop on init failure.
static void	cdc_route_usb_or_halt (void)
	Route both ports' pins: FS as device, HS as host.
static void	cdc_setup_or_halt (void)
	Bring CGC + both USB clocks + SysTick + SCI8 + LEDs + pins up.
void	main (void)
	Application entry: bring the board up, then hand off to ThreadX.

Variables
static volatile bool	s_tx_kernel_up = false
	Set in tx_application_define; gates ThreadX tick delivery.
static const ra8_port_pin_t	k_cdc_pin_fs_vbus = (ra8_port_pin_t)k_ra8_board_usbfs_pin_vbus
	USBFS VBUS sense pin (P4_07, PSEL = 0x13).
static const ra8_port_pin_t	k_cdc_pin_fs_vbusen = (ra8_port_pin_t)k_ra8_board_usbfs_pin_vbusen
	USBFS VBUSEN (P5_00) – GPIO LOW for the device role.
static const ra8_port_pin_t	k_cdc_pin_fs_dp = (ra8_port_pin_t)k_ra8_board_usbfs_pin_dp
	USBFS D+ (P8_14).
static const ra8_port_pin_t	k_cdc_pin_fs_dm = (ra8_port_pin_t)k_ra8_board_usbfs_pin_dm
	USBFS D- (P8_15).
static const ra8_port_pin_t	k_cdc_pin_hs_vbus = (ra8_port_pin_t)k_ra8_board_usbhs_pin_vbus
	USBHS_VBUS sense pin (P4_08, PSEL = 0x14).
static const ra8_port_pin_t	k_cdc_pin_hs_pwr = (ra8_port_pin_t)k_ra8_board_usbhs_pin_pwr
	J7 host-power switch (PD07): HIGH = U18 supplies VBUS (UM 6.2).
static TX_THREAD	s_device_thread
	ThreadX TCB for the USBX device-side worker thread.
static UCHAR	s_device_stack [k_cdc_thread_stack]
	Stack backing storage for s_device_thread.
static TX_THREAD	s_host_thread
	ThreadX TCB for the host-side worker thread.
static UCHAR	s_host_stack [k_cdc_host_stack]
	Stack backing storage for s_host_thread.
static UCHAR	s_usbx_pool [k_cdc_usbx_pool_bytes]
	USBX memory pool (USBX uses tx_byte_pool internally).
static UX_SLAVE_CLASS_CDC_ACM *	s_cdc_acm = UX_NULL
	Active CDC-ACM class instance, captured by the activate callback.
static TX_SEMAPHORE	s_cdc_active_sem
	Posted by the activate callback so the echo worker blocks on it instead of polling s_cdc_acm with tx_thread_sleep (which has been observed never returning on this silicon under load).
static volatile uint32_t	s_dbg_dev_echo_calls
	Device-side echo iterations (one read+write each).
static volatile uint32_t	s_dbg_dev_last_len
	Bytes the device echoed on the most recent round.
static volatile uint32_t	s_dbg_dev_step
	Device worker progress: 1 stack, 2 class, 3 dcd, 4 attach, 5 echo.
static volatile uint32_t	s_dbg_dev_err
	Device worker first failing return code (0 = none).
static UCHAR	s_device_framework_fs []
static UCHAR	s_string_framework []
	USBX string descriptor table (vendor / product / serial).
static UCHAR	s_language_id_framework [] = {k_usb_langid_en_us_lo, k_usb_langid_en_us_hi}
	USBX language-id table – US English.

Detailed Description

USB self-loop: HS host writes bytes to a CDC-ACM device, reads the echo.

Tag: [Ring 6 / APP] {World: S}

The CDC-ACM echo self-loop – it exercises a bidirectional bulk round-trip through a real device class (host bulk-OUT -> device receives -> device echoes -> host bulk-IN). The two USB ports are cabled to EACH OTHER and one firmware image runs both USB stacks:

USBFS (J11) = DEVICE: a ThreadX + USBX CDC-ACM class. A worker loops _ux_device_class_cdc_acm_read -> _ux_device_class_cdc_acm_write, echoing every byte the host sends straight back on the bulk-IN endpoint. IRQ-driven through the port/usbx/ux_dcd_ra8_usb bridge. (Worker-thread echo, NOT the DCD ISR auto-echo – the worker path rides the normal device bulk-OUT receive that the WRITE(10) driver fix repaired.)
USBHS (J7) = HOST: a self-contained polled CDC host built on the first-party ra8_usb_host_* primitives. It enumerates the device (bus reset -> GET_DESCRIPTOR -> SET_ADDRESS -> SET_CONFIGURATION), opens the CDC data interface's bulk pipes (EP2 OUT / EP1 IN), then runs several rounds: bulk-OUT a deterministic pattern, bulk-IN the echo, and byte-check it – proving the bidirectional bulk path round-trips intact, end to end on chip.

Each round ships a sub-MPS (60-byte) payload so the echo returns as a single short packet (no MPS-exact ZLP ambiguity on the host bulk-IN). No serial terminal is involved; raw bulk transfers only.

The link runs at 12 Mbps (FS device ceiling; HS host serves an FS downstream device).

Verdicts stream over SCI8 (J-Link OB CDC console, 115200) and are mirrored in J-Link-readable probes (s_dbg_*).

Pinout

FS device: P4_07 VBUS sense, P5_00 VBUSEN GPIO LOW (device role), P8_14 D+, P8_15 D- (PSEL usb_fs). HS host: SW4-8 to Host via the U15 expander, PD07 HIGH (U18 supplies J7 VBUS), P4_08 USBHS_VBUS (PSEL usb_hs). Console: PD_02/PD_03 SCI8 (PSEL sci_async).

Author: Brighton Sikarskie

Date: 2026-06-13

Copyright: Copyright (c) 2026 Brighton Sikarskie SPDX-License-Identifier: MIT

Since: 0.1.0

Definition in file main.c.

Enumeration Type Documentation

◆ cdc_dev_step_t

enum cdc_dev_step_t : uint32_t

J-Link probe values marking device-worker bring-up progress.

Enumerator
k_cdc_dev_step_stack	USBX system + device stack up.
k_cdc_dev_step_class	CDC-ACM class registered.
k_cdc_dev_step_dcd	DCD bridge initialized.
k_cdc_dev_step_attach	Device attached (DPRPU).
k_cdc_dev_step_echo	Echo loop running.

Definition at line 138 of file main.c.

◆ usb_langid_byte_t

enum usb_langid_byte_t : uint8_t

Enumerator
k_usb_langid_en_us_lo	LANGID 0x0409 low byte.
k_usb_langid_en_us_hi	LANGID 0x0409 high byte.

Definition at line 409 of file main.c.

Function Documentation

◆ _tx_timer_interrupt()

void _tx_timer_interrupt ( void )

extern

◆ cdc_activate()

VOID cdc_activate ( VOID * cdc_instance )

static

CDC-ACM activate callback.

Captures the live class instance.

Pins ux_slave_device_state at CONFIGURED (works around a residual DVSQ-poll race on this silicon that can demote it back to ATTACHED after SET_CONFIGURATION and break the cdc_acm_read gate), then posts the semaphore the echo worker blocks on. The DCD ISR auto-echo is deliberately NOT enabled – the worker read/write path is the sole data mover, so the two cannot race on the bulk-OUT pipe.

Parameters

[in] cdc_instance Pointer to UX_SLAVE_CLASS_CDC_ACM.

Precondition: Called from the USBX class thread.; SET_CONFIGURATION has just configured the device.

Postcondition: s_cdc_acm points at the live class.; s_cdc_active_sem is posted so the echo worker runs.

Note: USBX serializes this with the deactivate callback.

Since: 0.1.0

Definition at line 445 of file main.c.

References s_cdc_acm, and s_cdc_active_sem.

Referenced by cdc_class_register().

◆ cdc_class_register()

UINT cdc_class_register ( void )

static

Register the CDC-ACM class against configuration 1, interface 0.

Binds cdc_activate / cdc_deactivate so the worker learns when the host has configured the device. The comm + data interfaces are described by the device framework (IAD composite).

Returns: UINT UX_SUCCESS on success, propagated USBX error otherwise.

Return values

UX_SUCCESS Class registered.

Precondition: cdc_usbx_stack_up has succeeded.; cdc_activate / cdc_deactivate are defined.

Postcondition: The CDC-ACM class is bound; the activate callback will fire on SET_CONFIGURATION.; No other class is registered.

Note: Not re-entrant.

Since: 0.1.0

Definition at line 529 of file main.c.

References cdc_activate(), and cdc_deactivate().

Referenced by cdc_device_worker().

◆ cdc_deactivate()

VOID cdc_deactivate ( VOID * cdc_instance )

static

CDC-ACM deactivate callback.

Drops the live class pointer.

Parameters

[in] cdc_instance Unused.

Precondition: Called from the USBX class thread.; The CDC-ACM class is being torn down.

Postcondition: s_cdc_acm is UX_NULL.; The echo worker blocks until the next activate.

Note: USBX serializes this with the activate callback.

Since: 0.1.0

Definition at line 468 of file main.c.

References s_cdc_acm.

Referenced by cdc_class_register().

◆ cdc_device_worker()

VOID cdc_device_worker ( ULONG arg )

static

Device-side worker: bring the CDC-ACM device up, then echo forever.

USBX system + device stack + CDC-ACM class + DCD bridge on the USBFS controller, then DPRPU attach. Blocks on s_cdc_active_sem until the host configures the device, then loops cdc_echo_iter.

Parameters

[in] arg ThreadX entry argument (unused).

Precondition: tx_application_define created this thread.; USB-FS pins + 48 MHz clock are up (main did both).

Postcondition: The FS device is attached and echoes bulk-OUT back on bulk-IN.; On any bring-up failure the thread exits.

Note: Runs once; loops forever on success.

Since: 0.1.0

Definition at line 604 of file main.c.

References cdc_class_register(), cdc_echo_iter(), cdc_usbx_stack_up(), k_cdc_dev_step_attach, k_cdc_dev_step_class, k_cdc_dev_step_dcd, k_cdc_dev_step_echo, k_cdc_dev_step_stack, k_cdc_echo_buf, k_ra8_ok, k_ra8_usb_speed_fs, ra8_usb_device_attach(), s_cdc_acm, s_cdc_active_sem, s_dbg_dev_err, s_dbg_dev_step, TX_WAIT_FOREVER, and ux_dcd_ra8_usb_initialize().

Referenced by tx_application_define().

◆ cdc_echo_iter()

void cdc_echo_iter	(	UCHAR *	buf,
		ULONG	cap )

static

One device echo iteration: read a bulk-OUT chunk, write it back.

Pins CONFIGURED (DVSQ-poll race guard), then _ux_device_class_cdc_acm_read (blocks for the host's bulk-OUT, returns on the short packet) -> _ux_device_class_cdc_acm_write (stages the same bytes on bulk-IN). This rides the normal device bulk-OUT receive path the WRITE(10) driver fix repaired, NOT the DCD ISR auto-echo.

Parameters

[in,out]	buf	Scratch buffer for one chunk.
[in]	cap	Capacity of `buf` in bytes.

Precondition: s_cdc_acm is non-NULL (class activated).; buf holds cap bytes.

Postcondition: On a non-empty read the bytes were echoed; counters advanced.; On a read error the worker backs off one idle tick.

Note: Runs on the device worker thread.

Since: 0.1.0

Definition at line 565 of file main.c.

References k_ra8_board_led1, ra8_board_led_toggle(), s_cdc_acm, s_dbg_dev_echo_calls, s_dbg_dev_last_len, and tx_thread_sleep.

Referenced by cdc_device_worker().

◆ cdc_panic_halt()

void cdc_panic_halt ( void )

static

Halt forever in WFI – panic stop on init failure.

Last-resort stop; only a debugger or reset recovers.

Precondition: Called only after a fatal boot error.; Interrupts may be in any state.

Postcondition: CPU is parked.; No further code runs.

Note: Not reachable post-boot.

Since: 0.1.0

Definition at line 710 of file main.c.

Referenced by cdc_route_usb_or_halt(), cdc_setup_or_halt(), and main().

◆ cdc_route_usb_or_halt()

void cdc_route_usb_or_halt ( void )

static

Route both ports' pins: FS as device, HS as host.

FS device: P4_07 VBUS sense, P5_00 VBUSEN GPIO LOW (else peripheral routing forces host VBUSEN and blocks device enum), P8_14/P8_15 data. HS host: SW4-8 to Host via the U15 expander, PD07 HIGH (U18 supplies J7), P4_08 VBUS sense.

Precondition: IOPORT and the U15 expander are reachable.; Called once from cdc_setup_or_halt.

Postcondition: FS pins carry the device role, HS pins the host role.; PD07 is HIGH (J7 powered).

Note: Panic-halts on any routing failure.

Since: 0.1.0

Definition at line 733 of file main.c.

References cdc_panic_halt(), k_cdc_pin_fs_dm, k_cdc_pin_fs_dp, k_cdc_pin_fs_vbus, k_cdc_pin_fs_vbusen, k_cdc_pin_hs_pwr, k_cdc_pin_hs_vbus, k_ra8_level_high, k_ra8_level_low, k_ra8_ok, k_ra8_psel_usb_fs, k_ra8_psel_usb_hs, ra8_board_io_expander_set_usbhs_host_mode(), ra8_gpio_output_init(), and ra8_pfs_route_peripheral().

Referenced by cdc_setup_or_halt().

◆ cdc_setup_or_halt()

void cdc_setup_or_halt ( void )

static

Bring CGC + both USB clocks + SysTick + SCI8 + LEDs + pins up.

USBFS needs the 48 MHz PLL2 reference; USBHS needs its UTMI PLL. SCI8 is the J-Link OB CDC console at 115200.

Precondition: Reset_Handler finished C runtime init.; SystemInit has run.

Postcondition: Console works; both USB ports' pins and clocks are live.; LED1/LED2 are initialized.

Note: Panic-halts on any failure; called once from main.

Since: 0.1.0

Definition at line 772 of file main.c.

References cdc_panic_halt(), cdc_route_usb_or_halt(), k_cdc_baud, k_ra8_board_led1, k_ra8_board_led2, k_ra8_clock_id_cpuclk0, k_ra8_ok, ra8_board_led_init(), ra8_board_uart_console_init(), ra8_cgc_get_clock_hz(), ra8_cgc_init(), ra8_cgc_usbfs_clock_enable(), ra8_cgc_usbhs_pll_enable(), and ra8_time_init().

Referenced by main().

◆ cdc_usbx_stack_up()

UINT cdc_usbx_stack_up ( void )

static

Bring USBX system + device stack up with the CDC-ACM framework.

One-shot USBX pool + device-stack init (FS-only framework).

Returns: UINT UX_SUCCESS on success.

Return values

UX_SUCCESS Stack ready.

Precondition: File-scope pool reserved.; Thread context.

Postcondition: Device stack accepts class registrations.; On failure USBX state is undefined.

Note: Single-call; not idempotent.

Since: 0.1.0

Definition at line 494 of file main.c.

References k_cdc_usbx_pool_bytes, s_device_framework_fs, s_language_id_framework, s_string_framework, and s_usbx_pool.

Referenced by cdc_device_worker().

◆ main()

void main ( void )

Application entry: bring the board up, then hand off to ThreadX.

The application entry point Reset_Handler hands control to.

Both USB controllers' clocks and pins come up before the kernel so the workers only deal with stack bring-up.

Precondition: Reset_Handler copied .data and zeroed .bss.; SystemInit set VTOR, FPU, priority grouping.

Postcondition: On clean entry the CPU stays in tx_kernel_enter forever.; On any HAL init failure the function halts in WFI.

Note: Single entry point; not re-entrant.

Since: 0.1.0

Definition at line 816 of file main.c.

References cdc_panic_halt(), cdc_setup_or_halt(), and ra8_isr_globals_enable().

◆ SysTick_Handler()

void SysTick_Handler ( void )

Service the SysTick exception selected by the linked application.

Service one SysTick event for the core timebase.

Resolves to the weak core timebase handler unless a strong RTOS or application handler overrides it. The vector table references the selected implementation without owning its subsystem policy.

Precondition: Entered for a SysTick exception with a valid exception frame.; The selected handler's timebase or scheduler state is initialised.

Postcondition: The selected implementation has processed one SysTick event.; The vector table itself remains unchanged.

Note: Runs in handler mode; thread-safety follows the selected implementation.

Since: 0.1.0

The weak firmware implementation advances the millisecond counter, then services linked ThreadX and USB hooks when their weak symbols and readiness state permit. The host-test implementation advances only the counter. An application may replace either weak definition with a strong handler.

Precondition: The handler is entered for one SysTick event or a host-test equivalent.; On target, ra8_time_init() configured the SysTick period.

Postcondition: s_tick_ms has advanced by exactly one.; Optional subsystem hooks run only when linked and ready.

Note: IRQ-safe; the weak symbol may be overridden by an application handler.

Since: 0.1.0

Service the SysTick exception selected by the linked application.

The weak firmware implementation advances the millisecond counter, then services linked ThreadX and USB hooks when their weak symbols and readiness state permit. The host-test implementation advances only the counter. An application may replace either weak definition with a strong handler.

Precondition: The handler is entered for one SysTick event or a host-test equivalent.; On target, ra8_time_init() configured the SysTick period.

Postcondition: s_tick_ms has advanced by exactly one.; Optional subsystem hooks run only when linked and ready.

Note: IRQ-safe; the weak symbol may be overridden by an application handler.

Since: 0.1.0

Service the SysTick exception selected by the linked application.

Precondition: Called from exception context (IPSR == 15).; _tx_initialize_low_level has programmed SysTick.

Postcondition: One ThreadX tick elapsed; PendSV may be pending.

Definition at line 93 of file main.c.

References _tx_timer_interrupt(), ra8_time_on_tick(), s_tx_kernel_up, and ux_dcd_ra8_usb_irq_reenable().

◆ tx_application_define()

VOID tx_application_define ( VOID * first_unused_memory )

ThreadX application-define hook.

Spawns both workers.

Creates the activation semaphore, then the device worker at priority 8 and the host worker at 24 (below the USBX class threads). Sets s_tx_kernel_up so SysTick may feed ThreadX from here on.

Parameters

[in] first_unused_memory Sentinel (unused; static stacks).

Precondition: Called from tx_kernel_enter after scheduler init.; Static stacks are reserved at file scope.

Postcondition: s_cdc_active_sem exists and two auto-start workers are queued.; s_tx_kernel_up is true.

Note: Called once at boot; not thread-safe.

Since: 0.1.0

Definition at line 661 of file main.c.

References cdc_device_worker(), cdc_host_worker(), k_cdc_dev_priority, k_cdc_host_priority, k_cdc_host_stack, k_cdc_thread_stack, s_cdc_active_sem, s_device_stack, s_device_thread, s_device_thread_name, s_host_stack, s_host_thread, s_host_thread_name, s_tx_kernel_up, TX_AUTO_START, TX_NO_TIME_SLICE, and tx_thread_create.

Variable Documentation

◆ k_cdc_pin_fs_dm

const ra8_port_pin_t k_cdc_pin_fs_dm = (ra8_port_pin_t)k_ra8_board_usbfs_pin_dm

static

USBFS D- (P8_15).

Definition at line 117 of file main.c.

Referenced by cdc_route_usb_or_halt().

◆ k_cdc_pin_fs_dp

const ra8_port_pin_t k_cdc_pin_fs_dp = (ra8_port_pin_t)k_ra8_board_usbfs_pin_dp

static

USBFS D+ (P8_14).

Definition at line 114 of file main.c.

Referenced by cdc_route_usb_or_halt().

◆ k_cdc_pin_fs_vbus

const ra8_port_pin_t k_cdc_pin_fs_vbus = (ra8_port_pin_t)k_ra8_board_usbfs_pin_vbus

static

USBFS VBUS sense pin (P4_07, PSEL = 0x13).

Definition at line 108 of file main.c.

Referenced by cdc_route_usb_or_halt().

◆ k_cdc_pin_fs_vbusen

const ra8_port_pin_t k_cdc_pin_fs_vbusen = (ra8_port_pin_t)k_ra8_board_usbfs_pin_vbusen

static

USBFS VBUSEN (P5_00) – GPIO LOW for the device role.

Definition at line 111 of file main.c.

Referenced by cdc_route_usb_or_halt().

◆ k_cdc_pin_hs_pwr

const ra8_port_pin_t k_cdc_pin_hs_pwr = (ra8_port_pin_t)k_ra8_board_usbhs_pin_pwr

static

J7 host-power switch (PD07): HIGH = U18 supplies VBUS (UM 6.2).

Definition at line 123 of file main.c.

Referenced by cdc_route_usb_or_halt().

◆ k_cdc_pin_hs_vbus

const ra8_port_pin_t k_cdc_pin_hs_vbus = (ra8_port_pin_t)k_ra8_board_usbhs_pin_vbus

static

USBHS_VBUS sense pin (P4_08, PSEL = 0x14).

Definition at line 120 of file main.c.

Referenced by cdc_route_usb_or_halt().

◆ s_cdc_acm

UX_SLAVE_CLASS_CDC_ACM* s_cdc_acm = UX_NULL

static

Active CDC-ACM class instance, captured by the activate callback.

Note: Written by the USBX class thread; read by the device echo worker.

Since: 0.1.0

Definition at line 195 of file main.c.

Referenced by cdc_activate(), cdc_deactivate(), cdc_device_worker(), cdc_echo_iter(), demo_cdc_activate(), demo_cdc_activate(), demo_cdc_deactivate(), demo_cdc_deactivate(), demo_echo_iter(), demo_worker(), and demo_worker_echo_loop().

◆ s_cdc_active_sem

TX_SEMAPHORE s_cdc_active_sem

static

Posted by the activate callback so the echo worker blocks on it instead of polling s_cdc_acm with tx_thread_sleep (which has been observed never returning on this silicon under load).

Note: Single-producer (class thread), single-consumer (echo worker).

Since: 0.1.0

Definition at line 205 of file main.c.

Referenced by cdc_activate(), cdc_device_worker(), demo_cdc_activate(), demo_cdc_activate(), demo_worker(), and tx_application_define().

◆ s_dbg_dev_echo_calls

volatile uint32_t s_dbg_dev_echo_calls

static

Device-side echo iterations (one read+write each).

Definition at line 216 of file main.c.

Referenced by cdc_echo_iter().

◆ s_dbg_dev_err

volatile uint32_t s_dbg_dev_err

static

Device worker first failing return code (0 = none).

Definition at line 222 of file main.c.

◆ s_dbg_dev_last_len

volatile uint32_t s_dbg_dev_last_len

static

Bytes the device echoed on the most recent round.

Definition at line 218 of file main.c.

Referenced by cdc_echo_iter().

◆ s_dbg_dev_step

volatile uint32_t s_dbg_dev_step

static

Device worker progress: 1 stack, 2 class, 3 dcd, 4 attach, 5 echo.

Definition at line 220 of file main.c.

◆ s_device_framework_fs

UCHAR s_device_framework_fs[]

static

Definition at line 234 of file main.c.

◆ s_device_stack

UCHAR s_device_stack[k_cdc_thread_stack]

static

Stack backing storage for s_device_thread.

Since: 0.1.0

Definition at line 165 of file main.c.

◆ s_device_thread

TX_THREAD s_device_thread

static

ThreadX TCB for the USBX device-side worker thread.

Note: Single-writer (worker only).

Since: 0.1.0

Definition at line 158 of file main.c.

◆ s_host_stack

UCHAR s_host_stack[k_cdc_host_stack]

static

Stack backing storage for s_host_thread.

Since: 0.1.0

Definition at line 180 of file main.c.

◆ s_host_thread

TX_THREAD s_host_thread

static

ThreadX TCB for the host-side worker thread.

Note: Single-writer (worker only).

Since: 0.1.0

Definition at line 173 of file main.c.

◆ s_language_id_framework

UCHAR s_language_id_framework[] = {k_usb_langid_en_us_lo, k_usb_langid_en_us_hi}

static

USBX language-id table – US English.

Since: 0.1.0

Definition at line 419 of file main.c.

◆ s_string_framework

UCHAR s_string_framework[]

static

USBX string descriptor table (vendor / product / serial).

Each entry: 2 bytes lang-id, 1 byte string index, 1 byte length, then ASCII bytes.

Since: 0.1.0

Definition at line 350 of file main.c.

◆ s_tx_kernel_up

volatile bool s_tx_kernel_up = false

static

Set in tx_application_define; gates ThreadX tick delivery.

main() starts SysTick before tx_kernel_enter and the setup window is long (U15 expander I2C blocks for ms), so the tick fires pre-kernel; feeding _tx_timer_interrupt into ThreadX's zeroed timer state bus-faults. Gate it until the kernel runs.

Since: 0.1.0

Definition at line 90 of file main.c.

◆ s_usbx_pool

UCHAR s_usbx_pool[k_cdc_usbx_pool_bytes]

static

USBX memory pool (USBX uses tx_byte_pool internally).

Since: 0.1.0

Definition at line 187 of file main.c.

Enumerations

Functions

Variables

Detailed Description

Pinout

Enumeration Type Documentation

◆ cdc_dev_step_t

◆ usb_langid_byte_t

Function Documentation

◆ _tx_timer_interrupt()

◆ cdc_activate()

◆ cdc_class_register()

◆ cdc_deactivate()

◆ cdc_device_worker()

◆ cdc_echo_iter()

◆ cdc_panic_halt()

◆ cdc_route_usb_or_halt()

◆ cdc_setup_or_halt()

◆ cdc_usbx_stack_up()

◆ main()

◆ SysTick_Handler()

◆ tx_application_define()

Variable Documentation

◆ k_cdc_pin_fs_dm

◆ k_cdc_pin_fs_dp

◆ k_cdc_pin_fs_vbus

◆ k_cdc_pin_fs_vbusen

◆ k_cdc_pin_hs_pwr

◆ k_cdc_pin_hs_vbus

◆ s_cdc_acm

◆ s_cdc_active_sem

◆ s_dbg_dev_echo_calls

◆ s_dbg_dev_err

◆ s_dbg_dev_last_len

◆ s_dbg_dev_step

◆ s_device_framework_fs

◆ s_device_stack

◆ s_device_thread

◆ s_host_stack

◆ s_host_thread

◆ s_language_id_framework

◆ s_string_framework

◆ s_tx_kernel_up

◆ s_usbx_pool