Kconfig

menu "cUR (Uniform Resources)"

config UR_CRC32_SLICE_BY_8
    bool "CRC32: use slice-by-8 (faster, +8 KB flash)"
    default n
    help
        Use the slice-by-8 CRC32 implementation instead of the default
        64-byte nibble table. About 2.7x faster on ESP32-P4, at the cost
        of 8 KB of flash for a const lookup table. UR CRCs run over
        individual fragments (typically a few hundred bytes per QR
        frame), so the small table is rarely a bottleneck in practice.

config UR_XOR_ESP32P4_SIMD
    bool "Fountain XOR: use ESP32-P4 PIE 128-bit SIMD"
    depends on IDF_TARGET_ESP32P4
    default y
    help
        Use the ESP32-P4 PIE (xesppie) 128-bit vector unit for the
        fountain-code XOR reduction. About 4x faster than the portable
        word-wise path on aligned runs; unaligned data transparently
        falls back to the word-wise path. When enabled, cUR
        16-byte-aligns its buffer allocations so the vector path
        engages on them. Only visible on ESP32-P4; enabled by default
        there since it costs no RAM and little flash — disable it to
        keep the library free of target-specific code paths.

config UR_ALLOC_PSRAM
    bool "Allocate working buffers in PSRAM"
    default y
    help
        Route the library's allocations to external PSRAM
        (MALLOC_CAP_SPIRAM), falling back to internal RAM when PSRAM is
        absent or exhausted. Keeps the fountain decoder's churn of small
        variably-sized buffers from consuming and fragmenting internal
        RAM. Disable to keep buffers in internal RAM instead, e.g. when
        chasing XOR throughput on ESP32-P4 or reserving PSRAM for
        framebuffers. Harmless no-op when SPIRAM is not configured.

endmenu