KrzysztofC/nRF52840_PTT
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Initial bare-metal foundation for nRF52840 PTT-FHSS

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- Fully open toolchain: arm-none-eabi-gcc inside Podman/Docker container
- Platform-agnostic build via justfile (auto-detects podman vs docker)
- CMake + Ninja build system with arm-none-eabi toolchain file
- nRF52840 linker script and startup with full 64-entry vector table
- Register access via typed bitfield unions (include/regs.h)
- FHSS channel sequencer: AES-128-ECB PRNG over 40 channels (2402-2480 MHz)
- Low-power sleep via SYSTEM_ON WFI + GPIOTE wakeup on button press
- Vendor deps as shallow git submodules: nrfx, CMSIS_5, tiny-AES-c
This commit is contained in:
Krzysztof Cieślik
2026-05-21 20:20:21 +02:00
commit 438fca0ace
20 changed files with 739 additions and 0 deletions
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cmake/arm-none-eabi.cmake Normal file
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set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_C_COMPILER arm-none-eabi-gcc)
set(CMAKE_CXX_COMPILER arm-none-eabi-g++)
set(CMAKE_ASM_COMPILER arm-none-eabi-gcc)
set(CMAKE_OBJCOPY arm-none-eabi-objcopy)
set(CMAKE_SIZE arm-none-eabi-size)
# prevent cmake from link-testing the compiler against the host
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
# do not search host paths for libraries or headers
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)