tinyusb.git/hw/bsp/samd5x_e5x, branch claude/add-systemview-debug

sysview: per-family RTT buffer defaults, 65536 on RAM-rich parts

2026-09-03T21:21:57Z

The dual-role dogfood measured the 4096 fallback losing 96.7% of ISR exit contexts on mimxrt1064_evk and 99.1% on metro_m4_express; a local-board run measured stm32u575nucleo losing ~19% of the whole stream under a 12 s cdc_msc workload. The default was too small for any real capture on fast parts and every user had to rediscover that per board. Families now declare SYSVIEW_BUFFER_SIZE_DEFAULT in family.cmake (the SYSVIEW_RAM_BASE_DEFAULT pattern): imxrt, nrf, rp2040, samd5x_e5x, stm32f4, stm32f7, stm32h7 and stm32u5 set 65536, the measured-safe value. -DSYSVIEW_BUFFER_SIZE still beats everything; small-RAM parts keep the 4096 fallback and their per-board overrides (stm32f072disco's 2048 verified still honoured). lpc55 measured 34 lost events on the same route, an order of magnitude lighter, so it keeps the fallback rather than inheriting a default on thin evidence.

sysview: take the timestamp from a BSP hardware timer where the core has no DWT

2026-09-03T21:21:57Z

Cortex-M0/M0+, the WCH RISC-V parts and MAX3266x have no usable DWT cycle counter, so their family.c provides SEGGER_SYSVIEW_X_GetTimestamp() from a free-running hardware timer: a 32-bit general-purpose timer on ST parts (sysview_stm32_tim2.h), SysTick-extended sources on the M0 families, the core's SysTick-equivalent on WCH with the documented ordered read of the split count registers (sysview_wch_timestamp.h), and a TMR on MAX3266x (sysview_max32_tmr.h). max32666fthr's DWT implements only watchpoint comparators (DWT_CTRL.NOCYCCNT=1 read live; UG6971 documents no DWT/trace at all), so SystemView's ARMv7-M default read 0xE0001004 as a frozen 0 and every duration decoded as zero. The TMR runs at 48 MHz (f_PCLK = f_SYS_CLK/2; Continuous mode, CMP=0xFFFFFFFF, prescaler 1 - UG6971 15.2 guarantees TMRn_CNT readable while counting); TMR0 by default - present on every MAX32 part, unused by the examples, FreeRTOS ticks on SysTick - overridable with -DSYSVIEW_MAX32_TMR=n. The family builds SystemView with SEGGER_SYSVIEW_CORE_OTHER and sets CFG_TUSB_SYSVIEW_TIMESTAMP_BSP, a tusb_sysview.c opt-in for ARMv7-M parts without CYCCNT where the BSP also reports the rate via SEGGER_SYSVIEW_X_GetTimestampFreq(); the fixed-1MHz microsecond contract is unreachable on a powers-of-two-only prescaler. SEGGER_SYSVIEW_X_GetInterruptId() gains the ICSR.VECTACTIVE read for CORE_OTHER builds. MAX32650/32690 use different GCR clock-gate names and stay unported. Measured on the rig: seven host-timed 1.000 s gaps at 1.00044-1.00091 (median +0.05%). stm32f0 refuses to configure SYSVIEW for stm32f070xb at CMake time: that variant has no TIM2 at all, and the alternative was an undefined-reference link error with no hint. The shared hw/bsp/sysview_*.h join ci_select rule 16's hw/bsp file list (cross-family build files, compiled only under -DSYSVIEW which no CI leg enables), mirrored in the spec's rule table, so master's classification guard resolves them on both axes.

sysview: FreeRTOS trace hooks, stack high-water and heap tracking

2026-09-03T21:21:57Z

hw/bsp/sysview_freertos_hooks.h maps the FreeRTOS trace macros onto SystemView task records (task names, switches, ready/blocked) and adds heap tracking; the FreeRTOSConfig.h of the families used on the rig include it when SYSVIEW is on. The FreeRTOS examples grow their USB task stacks when CFG_TU*_SYSVIEW is enabled, the same way they already do for CFG_TUSB_DEBUG -- the instrumentation's stack cost is real (measured overflows on lpc55 before the bump).

samd5x_e5x: ETM trace support for same54_xplained

2026-07-24T08:56:14Z

The populated 20-pin Cortex Debug+ETM header carries 4-bit trace (TRACECLK=PC27, D0-3=PC28/PC26/PC25/PC24, mux H). TRACE_ETM builds mux the pins and enable GCLK channel 47 (GCLK_CM4_TRACE) from GCLK0 - without that gate the port stays silent with pins and TPIU armed. Chip-max 120 MHz core / 60 MHz TRACECLK validated (3x 280M-fetch captures).

remove IAR toolchain support from make build system

2026-04-06T04:17:34Z

IAR is only supported with CMake. Remove all IAR-specific references from the Make build system including toolchain files, SRC_S_IAR, LD_FILE_IAR variables, and IAR toolchain detection. Also fix GET_SECTOR_COUNT truncation in msc_file_explorer and broken formatting in stm32f7 board_uart_write. Co-Authored-By: Claude Opus 4.6 (1M context)

move MAX3421_HOST build flag to test config for metro_m4_express

2026-04-04T14:35:42Z

make board_uart_read()/write() return -1 when unimplemented for consistency across all families

2026-04-04T14:32:39Z

implement board_uart_read()/write() as non-blocking for all families

2026-04-04T06:20:58Z

replace board_millis() with tusb_time_millis_api()

2026-02-27T17:01:40Z

bsp: Disable SysTick ISR if FreeRTOS is enabled

2025-11-25T15:30:32Z