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The Hosyond 5" panel uses Pi 7" v1.1 architecture (ATTINY ID 0xC3 +
TC358762 DSI-to-DPI bridge). Getting it to paint needed three things
that ESP-IDF doesn't expose:
1. TC358762 bridge configuration — 16 register writes via DSI Generic
Long Write (DT=0x29) packets, transcribed from Linux's tc358762.c.
2. Non-burst video mode — IDF hardcodes BURST_WITH_SYNC_PULSES, but
TC358762 requires NON_BURST_WITH_SYNC_PULSES. Overridden via the
mipi_dsi_host_ll_* API after esp_lcd_new_panel_dpi() and before
panel_init().
3. ATTINY v1.1 power-on sequence + SPI-proxy bridge wake. The legacy
REG_POWERON(0x85) path doesn't apply to 0xC3 firmware; instead
write PORTC/PORTA/PORTB/PORTC in order, then later release bridge
reset and proxy-write TC358762 SYSPMCTRL=0 through the ATTINY's
ADDR_H/L + WR_DATA_H/L registers.
Reaching the LL/HAL APIs requires shadowing esp_lcd_dsi_bus_t so we can
pick the mipi_dsi_hal_context_t out of the private struct. Documented
the layout dependency at the shadow definition.
Tuned config (observed stable on ESP32-P4 per embenix's reference):
- 1 data lane @ 600 Mbps
- DPI 26 MHz (Linux modeline is 25.98)
- timings HSW=2 HBP=46 HFP=210 / VSW=20 VBP=4 VFP=22
- RGB888 end-to-end, R,G,B byte order (BGR was wrong)
- disable_lp=0 so LP windows are available for the bridge writes
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DSI / panel:
- LDO_VO3 acquired at 2500 mV (VDD_MIPI_DPHY) — without this the PHY
PLL busy-waits forever inside esp_lcd_new_dsi_bus.
- PSRAM bumped to 200 MHz (CONFIG_IDF_EXPERIMENTAL_FEATURES) to keep
the DPI fed without underruns.
- Pi-7"-style 800x480 panel init (REG_POWERON, PORTA/PORTB/PWM/PORTC)
+ 16-bit RGB565 framebuffer with portrait-mode rotation buffer in
PSRAM. Currently shows garbled output — known issue, next commit
switches to the TC358762-bridge-aware init sequence.
State + UX:
- viewport_state simplified to AWAKE/ASLEEP only; "unconfigured" is
a flag, not a state. Tap always toggles; content choice (identity
vs frame) is driven by the configured flag.
- BOOT button arms a 15 s identity overlay via local_screens_overlay;
expired callback returns to prior state.
- Boot-done indicator: two backlight flashes (no usable LED GPIO on
the Waveshare board — GPIO 35 BOOT is shared with EMAC TXD1).
- Best-effort subsystem init in app_main; display init deferred to
its own task so a panel hang can't block networking.
Display test pattern: solid R/G/B for 2 s each on boot to characterize
the garble independent of text rendering.
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state_client.{h,c}:
- Worker task drains a depth-1 queue (xQueueOverwrite gives the
replace-on-full semantics from the spec — in-flight POST is never
cancelled; the next queued entry is overwritten by newer state).
- esp_http_client POST to <scrypted>/state with Content-Type application/
json, User-Agent ScryptedViewport/<version>, Connection: close, 1s
timeout. Body: {"viewport":"<name>","state":"wake"|"sleep"}.
- Any non-2xx or transport error increments state_post_failures and is
otherwise ignored. Silently drops if no Scrypted URL is configured.
touch.{h,c}:
- FT5426 capacitive touch on the shared I2C bus at 0x38.
- 30ms polling task; tracks down/up transitions, detects taps as
down-then-up within 500ms with a 150ms debounce.
- On tap, toggles wake/sleep via state_machine_set_local(), which drives
the local transition AND fires state_client_post() at Scrypted.
state_machine adds state_machine_set_local(): runs the same transition
as state_machine_set() then enqueues an outbound POST. Idle-timer
expiry now uses this path so Scrypted sees idle-driven sleeps too
(the spec's "tighten the race with /frame 409" path stays in place as
the fallback).
display.h exposes display_i2c_bus(); touch.c uses it instead of
re-initializing the same I2C port.
app_main starts state_client right after the state machine and starts
touch after display init (touch is skipped if display isn't up since
they share the bus).
CMakeLists.txt: add esp_http_client to REQUIRES.
Build clean against ESP-IDF 5.4 (binary ~860 KB; jumped ~210 KB from
M6 because esp_http_client + cJSON path pulls in tcp_transport, mbedtls,
http_parser).
TESTING.md M7: flask-based test receiver, tap dispatch verification,
failure-path check (kill receiver, confirm counter increments),
queue-coalescing behavior, no-POST-on-Scrypted-initiated, no-POST-
when-unconfigured.
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jpeg_decoder.{h,c} wraps esp_driver_jpeg (ESP32-P4 hardware decoder).
- One-time engine + DMA-aligned PSRAM scratch buffer setup (1 MB input,
768 KB output @ panel native 800x480 RGB565).
- try_lock + unlock so concurrent /frame POSTs get 503 instead of
queueing, per spec.
- jpeg_decoder_get_info() reports the dimensions; the http handler
validates them against the effective resolution before painting.
display.h adds display_present_rgb565(src, w, h):
- Landscape: src is 800x480, memcpy 1:1 into the panel framebuffer.
- Portrait: src is 480x800, software rotate 90° CW into the 800x480
panel framebuffer. (PPA / 2D-DMA hardware rotation is a later
optimization if portrait latency matters.)
http_api.c adds POST /frame:
- Content-Type must be image/jpeg → else 400.
- Empty body → 400. > 1 MB → 413. Display not initialized → 500.
- jpeg_decoder_try_lock(0) for concurrency: second post returns 503.
- Body streamed into the decoder's input buffer in chunks.
- Decode failure or dimension mismatch → 400 + decode_errors++.
- Paint failure → 500.
- Success → frames_received++, last_frame_us = esp_timer_get_time(),
204 No Content.
app_main initializes the JPEG decoder after display_init(). Both are
best-effort: failures log a warning and leave the rest of the firmware
running.
CMakeLists.txt: add esp_driver_jpeg to REQUIRES.
Known gap (M6 closes it): /frame currently paints regardless of
wake/sleep state. The 409-when-asleep rule lands with POST /state
in M6.
Build clean against ESP-IDF 5.4 (binary ~640 KB).
TESTING.md M5 expanded with portrait/landscape test commands,
ImageMagick test-image recipes, the full negative matrix (wrong
Content-Type, oversize, wrong dims, concurrent, garbage), and the
M6 dependency note.
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display.{h,c} brings up the Hosyond 5\" 800x480 panel via the Raspberry
Pi 7\" touchscreen architecture:
- I2C init to the panel-side MCU at 0x45 (Pi 7\" register map ported
from drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c).
- POWERON write + 120ms settle.
- ESP32-P4 MIPI-DSI bring-up in DPI video mode: 2-lane, 480 Mbps,
800x480 @ 60Hz, RGB565, canonical Pi 7\" timings (HSW=18/HBP=20/HFP=62,
VSW=4/VBP=27/VFP=18, 30 MHz pixel clock).
- Gamma-corrected (^2.2) PWM brightness via REG_PWM (0x86).
- display_sleep / display_wake hooks for M6.
- display_fill() and display_test_pattern() (8 vertical color bars)
for M3 acceptance and reuse by M8 local screens.
app_main calls display_init() as best-effort — if the panel isn't
attached or wiring is wrong, the rest of the firmware (Ethernet, mDNS,
/state) keeps running. On success it paints the test pattern.
Pin assignments (PIN_I2C_SDA=7, PIN_I2C_SCL=8) match Waveshare's
bundled-panel BSP convention but are flagged TODO until the user's
specific FPC adapter wiring is confirmed.
main/CMakeLists.txt: add driver, esp_driver_i2c, esp_lcd to REQUIRES.
Build verified clean against ESP-IDF 5.4 for target esp32p4. M3
acceptance (color bars on screen) cannot be verified without a
flashed board + connected panel.
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