OpenPuck/OpenPuckZephyr/prj.conf

# OpenPuck Zephyr configuration.
#
# The RADIO peripheral is driven bare-metal (reverse-engineered SC2 protocol),
# so NO Zephyr radio stack may claim it.
CONFIG_BT=n
CONFIG_IEEE802154=n
CONFIG_NRF_802154_RADIO_DRIVER=n

# C++ (the ported modes/protocol are C++).
CONFIG_CPP=y
CONFIG_STD_CPP17=y
CONFIG_REQUIRES_FULL_LIBCPP=n
CONFIG_CPP_EXCEPTIONS=n
CONFIG_CPP_RTTI=n

# Console/logging.
CONFIG_LOG=y
CONFIG_PRINTK=y

# USB device stack (next/USBD). The HID pool (app.overlay) + the board CDC ACM
# console register as classes; the firmware brings the stack up via the TinyUSB
# shim (USBDevice.attach -> opk_usbd_enable), not at boot.
CONFIG_USB_DEVICE_STACK_NEXT=y
CONFIG_USBD_HID_SUPPORT=y
CONFIG_USBD_CDC_ACM_CLASS=y
CONFIG_CDC_ACM_SERIAL_INITIALIZE_AT_BOOT=n
CONFIG_HWINFO=y
CONFIG_USBD_LOG_LEVEL_ERR=y
CONFIG_USBD_HID_LOG_LEVEL_ERR=y

# Core subsystems used by the port.
CONFIG_GPIO=y
CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_REBOOT=y

# CRITICAL: link the image at the code partition (0x26000) so it loads where the
# Adafruit/nice!nano UF2 bootloader expects the application. Without this Zephyr
# links at 0x0 and the UF2 would overwrite the MBR/bootloader region (brick).
CONFIG_USE_DT_CODE_PARTITION=y

# Persistence: the Arduino tree stored cfg.bin/bonds.bin in the nRF52 internal
# LittleFS. We keep LittleFS (Zephyr's fs subsystem on the storage partition) so
# the persistence code ports behind a thin Adafruit_LittleFS shim.
CONFIG_FILE_SYSTEM=y
CONFIG_FILE_SYSTEM_LITTLEFS=y
CONFIG_FILE_SYSTEM_MKFS=y

# The firmware drives the WDT peripheral directly (NRF_WDT, ported verbatim from
# the Arduino setup()/loop()), so Zephyr's watchdog driver is left out to avoid
# double-ownership of the peripheral.

# Microsecond timing for the RF poll busy-waits comes from a dedicated 1 MHz
# nrfx TIMER in the compat layer (the kernel RTC tick is too coarse), so the
# kernel clock is left at its board default here.

# Reasonable main stack for the cooperative loop + protocol state.
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_HEAP_MEM_POOL_SIZE=2048