Wiegand.h Apr 2026

// Callback type for completed card reads typedef void (*wiegand_callback_t)(uint32_t facility_code, uint32_t card_number, int bits_received);

Remember: Implement it correctly once, and you’ll support every major card reader on the market. Have you battled Wiegand jitter or bit‑order issues? Share your experience below. wiegand.h

// Public API void wiegand_init(const wiegand_config_t *config); void wiegand_set_callback(wiegand_callback_t cb); void wiegand_reset(void); bool wiegand_available(void); uint32_t wiegand_get_facility(void); uint32_t wiegand_get_card(void); int wiegand_get_bit_count(void); // Callback type for completed card reads typedef

// Configuration structure typedef struct uint8_t pin_d0; uint8_t pin_d1; uint32_t bit_timeout_us; // Max gap between bits (e.g., 2500) uint32_t packet_timeout_us; // Gap to finalize packet (e.g., 15000) bool pullup_enable; // Use internal pullups? wiegand_config_t; Polling will miss microsecond pulses

while (1) vTaskDelay(pdMS_TO_TICKS(1000));

#endif // WIEGAND_H 1. Interrupt‑Driven Bit Capture The only reliable way to read Wiegand is via edge-triggered interrupts on the D0 and D1 pins. Polling will miss microsecond pulses.