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cb35e6e31a
OSD redesign based on Jason Young's (RPi) proven topology:
- Replace GS8052 dual op-amp with dedicated ICs: TLV3201 comparator,
SN74LVC1G3157 SPDT mux, TLV9061 non-inverting buffer, SDM02U30LP3
Schottky for DC restore
- Add chroma filter (680R+470pF), AC coupling (1uF), resistor divider
pixel level (12k/3.9k/1.4k), gain-2 buffer (470R/470R)
- Fix C66 footprint 0201->0402 for 1uF cap
- Assign correct LCSC part numbers for all 13 OSD passives
Library fixes:
- Add new footprints: X2SON-4, X2SON-6, X3-DFN0603, SC-70-6,
SOD-523, SOT-23-5, MouseBite for local OSD components
- Add matching 3D models (step+wrl) for all new footprints
- Fix 8 footprints with broken 3D model paths in lib.pretty
(/.3dshapes/ -> ${KIPRJMOD}/lib.3dshapes/, remove double hardware/)
- Fix 5 broken 3D model paths in PCB file
- Add symbols for TLV3201, SN74LVC1G3157, TLV9061, SDM02U30LP3
- Add datasheets/ and image (1).png to .gitignore
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
71 lines
3.1 KiB
Markdown
71 lines
3.1 KiB
Markdown
# OpenFC — Project Instructions
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## What This Is
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Open-source Betaflight flight controller. 30x30mm, 4-layer, 2S-6S. Integrated ELRS receiver (break-off tab).
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## Key ICs
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| IC | Part | LCSC | Bus |
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|----|------|------|-----|
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| MCU | RP2354B (QFN-80, 2MB flash) | C39843328 | — |
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| IMU | LSM6DSV16XTR | C5267406 | SPI0 (GPIO18-20), CS=GPIO14, INT=GPIO13 |
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| Baro | BMP388 | C779278 | I2C0 (GPIO16/17) |
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| Blackbox | BY25Q128ASWIG | C394872 | SPI1 (GPIO42-44), CS=GPIO46 |
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| ELRS MCU | ESP32-C3FH4 | C2858491 | UART1 (GPIO21 RX, GPIO22 TX funcsel 11) |
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| ELRS Radio | SX1281IMLTRT | C2151551 | SPI to ESP32 |
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| 12V Buck | LMR51420YDDCR/YFDDCR | C5383002/C7296200 | — |
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| 3.3V LDO | LP5912-3.3DRVR | C524780 | — |
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| 1.8V Gyro LDO | NCV8187AMT180TAG | C893189 | — |
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| ELRS 3.3V LDO | WL9005D4-33 | C5357206 | — |
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| Power Mux | TPS2116DRLR | C3235557 | — |
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| OSD Mux | PI3A223ZMEX | — | GPIO32-37 |
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## GPIO Map (RP2354B → Betaflight)
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- UART0: TX=GPIO0, RX=GPIO1
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- UART1 (ELRS): TX=GPIO22 (funcsel 11 UART_AUX), RX=GPIO21
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- PIO UART0: TX=GPIO2, RX=GPIO3
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- PIO UART1: TX=GPIO26, RX=GPIO27
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- Motors: M1=GPIO31, M2=GPIO30, M3=GPIO29, M4=GPIO28 (PIO0 DShot)
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- OSD: VBLACK=GPIO32, SYNC_IN=GPIO33, PIXEL_SEL=GPIO34, VWHITE=GPIO35, COLOR_SEL=GPIO36, SYNCLVL=GPIO37
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- ADC: VBAT=GPIO41, CURRENT=GPIO40, RSSI=GPIO45, EXT=GPIO47
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- LED strip: GPIO23 (PIO2), Status LED: GPIO12
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- 10V enable: GPIO11, Beeper: GPIO6
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- ESP control: EN=GPIO24, BOOT=GPIO25
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## Power Tree
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+BATT → LMR51420 → +12V (switchable via GPIO11) / +5V_BUCK (always on)
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+5V_BUCK + VBUS → TPS2116 mux → +5V → LP5912 → +3.3V → RP2354B VREG → +1.1V
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+5V → WL9005D4 → +3.3V_ELRS | +5V → NCV8187 → +1.8V_GYRO
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## PIO Allocation
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PIO0: DShot (motors), PIO1: PIO UARTs, PIO2: LED strip + OSD
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## Critical Open Issues (pre-production review 2026-03-01)
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1. **CRIT-1**: SX1281 VDD_IN disconnected — no power to radio
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2. **CRIT-2**: Motor pin numbering M1-M4 reversed vs BF config
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3. **CRIT-3**: OSD needs 3 consecutive pins for FB_OSD (remap GPIO33=W, 34=EN, 35=SYNC)
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4. **CRIT-4**: No battery reverse polarity protection
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5. **CRIT-5**: ELRS LDO EN tied to own output (bootstrap problem)
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## Schematic Structure
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`hardware/` — KiCad 9 hierarchical: root `OpenFC.kicad_sch` + 12 sub-sheets:
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rp2350a, elrs, power, pads, connectors, osd, Radioschematic, leds, imu, baro, blackbox, compass (DNP)
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## Rules
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- **NEVER** raw-edit `.kicad_sch`, `.kicad_pcb`, `.kicad_pro` — use Python scripts with kicad-skip or pcbnew API
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- Python tools live in `hardware/tools/`
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- Libraries are project-local: `hardware/lib.kicad_sym`, `hardware/lib.pretty/`, `hardware/lib.3dshapes/`
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- Production exports in `hardware/production/` — use KiCad Fabrication Toolkit for JLCPCB
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- JLCPCB assembly, prefer LCSC basic parts
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- Full review in `OpenFC_preproduction_review.md`
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## Firmware
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- Target: Betaflight RP2350B (PICO platform)
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- No firmware in this repo yet
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- RP2354B uses Pico SDK (C/C++), PlatformIO
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- ESP32-C3FH4 runs ExpressLRS firmware (separate build)
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## README Discrepancies (fix these)
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- README says BMI388 → actual is BMP388
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- README says W25Q128JVPIQTR → actual is BY25Q128ASWIG
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- 10V rail is actually ~12.1V per feedback divider
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