Add PrincipIoT H7 Pi target

[lukas-principiot]

Adding the PrincipIoT H7 Pi target. I've been in communication with the dev team on Discord and will be sending a sample to Haslinghuis soon.

Two open questions I have (I'm still a bit cloudy on these):

• Are the ADC DMA options configured correctly?
• Are the Timer DMA options configured correctly?

Checklist (✓/✕, or y/n)

• [✓] passed Betaflight team's schematics review
• [✓] passed hardware samples testing
• [✓] follows guidelines
• [✓] follows connector standards
• [Shortly] flight tested
• [✓] comments/issues resolved

Summary by CodeRabbit

• New Features
  • Added support for the PRINCIPIOTH7PI flight controller: enables motors/servos, beeper, LED strip, SD card blackbox logging, multiple UARTs, I2C/SPI sensors (dual IMUs, barometer, magnetometer), ADC-based voltage/current sensing, VTX power control via PINIO, RX/GPS routing, and flexible timer/PWM mappings for peripherals.

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Walkthrough

Adds a new board configuration header for PRINCIPIOTH7PI (STM32H743) declaring MCU/board metadata and extensive pin/peripheral mappings (motors/servos/LEDs/UART/I2C/SPI/ADC/SDIO), DMA/timer mappings, sensor selections/alignments (ICM42688P, IIM42653, DPS310, LIS2MDL), RX/blackbox/PINIO/VTX macros.

Changes

Cohort / File(s)	Summary
New PRINCIPIOTH7PI board configuration configs/PRINCIPIOTH7PI/config.h	Added complete board header: FC_TARGET_MCU, BOARD_NAME, MANUFACTURER_ID, extensive GPIO pin mappings (motors, servos, LED strip, UARTs, I2C, SPI, ADC, SDIO), ADC/VBAT/CURRENT mappings, DMA/timer opts and TIMER_PIN_MAPPING, sensor enable/instance/align macros (ICM42688P, IIM42653, DPS310, LIS2MDL), SD card/blackbox defaults, RX/GPS UART assignments, PINIO/VTX controls and related macros.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Add SPEDIXH743 #791 — Adds an STM32H743 board config header with overlapping pin and peripheral macro declarations.
• Add DREAMWORKSH743 #1013 — Introduces another STM32H743 board header defining similar MCU/pin mappings, sensor selections, TIMER_PIN_MAPPING and SD/blackbox macros.
• Add HGLRCH743 #872 — Adds an STM32H743 board config with matching sensor, DMA, timer and PINIO mappings.

Suggested labels

Schematics approved, Awaiting prototype samples, Uses BF connector standard

Suggested reviewers

• ot0tot
• nerdCopter

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is missing key required sections and critical information. While the author mentions schematics review and ongoing communication, the template requires documented evidence of hardware testing and flight testing completion.	Complete the checklist items: add documentation of hardware samples testing completion, confirm flight testing is done (not 'shortly'), and address the open technical questions about ADC/Timer DMA configurations before merging.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Add PrincipIoT H7 Pi target' accurately and concisely describes the main change—introducing a new board configuration for the PrincipIoT H7 Pi flight controller.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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