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)
16 lines
358 B
C
16 lines
358 B
C
/* UA1ZBE Custom Firmware - _sbrk stub
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*
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* Newlib requires _sbrk for malloc/sbrk system calls.
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* Since this firmware uses zero dynamic allocation,
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* we provide a minimal stub that always fails.
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*/
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#include <sys/types.h>
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caddr_t _sbrk(int incr)
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{
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/* No heap available — return NULL to indicate failure */
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(void)incr;
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return (caddr_t)0;
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}
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