ua1zbe
a1206d6fd4
Features: - VFO mode with direct frequency input - POCSAG decoder (512/1200 baud) with BCH(31,21) correction - Full-screen Spectrum analyzer - FM Radio receiver - RSSI signal indicator overlay - Custom boot splash (UA1ZBE / POCSAG pager / build date) Architecture: - app/mode.c — mode dispatcher (VFO/POCSAG/Spectrum/FM) - app/boot_splash.c — 2-second boot splash - app/pocsag/ — POCSAG decoder + BCH correction - app/display_rssi.c — RSSI indicator - main.c — entry point with custom init - syscalls.c — bare-metal _sbrk stub Build: arm-none-eabi-gcc -Os -flto -Wall -Werror -Wextra Size: 57.9KB Flash / 3.6KB RAM Controls: - 0-9: Direct frequency input (VFO) - SK2: POCSAG mode - SK1: Spectrum analyzer - 0: FM Radio - EXIT: Return to VFO - F/*: Toggle 512/1200 baud (in POCSAG)
26 lines
641 B
C
26 lines
641 B
C
/* UA1ZBE Custom Firmware - BCH(31,21) header */
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#ifndef APP_POCSAG_BCH31_H
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#define APP_POCSAG_BCH31_H
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#include <stdint.h>
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#include <stdbool.h>
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/* Correct errors in a POCSAG 32-bit word in place.
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* Returns: 0 = no error, 1 = single corrected,
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* 2 = double corrected, -1 = uncorrectable */
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int bch31_correct(uint32_t *word);
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/* Extract 21 data bits from corrected word */
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uint32_t bch31_get_data(uint32_t word);
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/* Get 2-bit function code */
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uint8_t bch31_get_func(uint32_t word);
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/* Check if word is sync word */
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bool bch31_is_sync(uint32_t word);
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/* Check if word is idle word */
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bool bch31_is_idle(uint32_t word);
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#endif
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