usb_selftest_hs_host Directory Reference

Directory dependency graph for usb_selftest_hs_host:

Directories
	inc
	src

Detailed Description

The board's two USB ports are cabled to each other and ONE image runs BOTH sides of the link, then verifies itself on-chip – no PC in the loop. USBFS (J11) is the usb_msc_mram Mass-Storage class exposing the 1 MiB MRAM window at 0x02000000 as a read-only synthesized FAT16 volume, IRQ-driven through the ux_dcd_ra8_usb device bridge; USBHS (J7) is the first-party polled host MSC stack (ra8_usb_hmsc + ra8_fs) in a low-priority ThreadX thread, which mounts the volume and memcmp's every raw multi-block READ(10) burst against the same MRAM bytes read directly. WRITE(10) into the read-only LUN must be rejected, and the MRAM is never touched.

The FS device is the speed ceiling, so the HS host serves a full-speed downstream device (RHST = FS) – a path the Mac-attached ladders never exercise. What it proves is that the USBX device stack and the first-party host stack run concurrently in one image, one controller each, and that the SCSI transport returns the chip's flash byte for byte with no external host in the loop.

Bring-up notes (the two non-obvious fixes)

1. Pre-kernel SysTick. main() starts SysTick, for ra8_delay_ms, before tx_kernel_enter, and this app's setup window is long (the U15 expander I2C transaction blocks for milliseconds), so the tick fires before ThreadX timer state exists. Feeding _tx_timer_interrupt then walks a zeroed expiration list and bus-faults. The handler gates ThreadX delivery on s_tx_kernel_up, set in tx_application_define.
2. Thread priority. The polled host loop busy-waits for device data, and the USBX device storage class thread (UX_THREAD_PRIORITY_CLASS) is what actually runs media_read. The host worker must therefore sit BELOW it or the class thread can never preempt the spin and every bulk read times out – while enumeration still works, since device SETUP is ISR-driven. That was the 0x203 mount timeout.

Known limitation (#92)

The WRITE(10) rejection leaves the bulk-OUT endpoint STALLed. Recovering the BOT transport afterwards (Bulk-Only Mass Storage Reset + Clear Feature ENDPOINT_HALT) is not in the host class yet, so the run parks after a single pass rather than looping.

Pinout

FS device: P4_07 VBUS sense, P5_00 VBUSEN GPIO LOW (device role), P8_14/P8_15 data (PSEL usb_fs). HS host: SW4-8 Host via the U15 expander, PD07 HIGH (U18 powers J7), P4_08 VBUS sense (PSEL usb_hs). Console: PD_02/PD_03 SCI8. The device advertises VID 0x1209 with a per-app PID, distinct from the Mac-facing MRAM apps; bench use only.