/**
 * @file app_display.h
 * @brief YF30137 7-segment display driver.
 *
 * The YF30137 is a 7-pin Charlieplexed LED module:
 *   - 5 seven-segment digits (DIG1..DIG5, segments A..G)
 *   - DIG6 holds two single indicators: A6 = "deg F", B6 = decimal point
 *
 * A dedicated FreeRTOS task (display_task) scans the module continuously.
 * Every other task updates the display simply by calling display_set();
 * the scan task only reads the global state and never blocks callers.
 */
#ifndef __APP_DISPLAY_H__
#define __APP_DISPLAY_H__

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>

/* Display type / unit (controls the DIG6 "deg F" indicator A6) */
#define DISP_TYPE_CELSIUS    0u   /* degree C: A6 off */
#define DISP_TYPE_FAHRENHEIT 1u   /* degree F: A6 on  */

/* Number base for the displayed value */
#define DISP_BASE_DECIMAL    10u
#define DISP_BASE_HEX        16u

/**
 * @brief  Update what the display should show (read by the scan task).
 * @param  value  floating value to display
 * @param  type   DISP_TYPE_CELSIUS / DISP_TYPE_FAHRENHEIT
 * @param  base   DISP_BASE_DECIMAL (1 decimal place) / DISP_BASE_HEX
 * @note   Non-blocking; may be called from any task context.
 */
void display_set(float value, uint8_t type, uint8_t base);

/**
 * @brief  Display driver FreeRTOS task: Charlieplexing scan loop, never returns.
 */
void display_task(void *pvParameters);

#ifdef __cplusplus
}
#endif

#endif /* __APP_DISPLAY_H__ */