#ifndef MESSAGE_H
#define MESSAGE_H

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

typedef enum {
    UI_SPEED_MS,
    UI_BATTERY,
    UI_VOLTAGE,
} MessageType;

typedef union {
    int   battery;
    int   speed_ms;
    float voltage;
} MessageData;

typedef struct {
    MessageType type;
    MessageData data;
    int16_t     crc;
} Message;

void message_create(Message *m, MessageType type, MessageData data);
bool message_validate(const Message *m);
int  message_tests(void);
uint16_t compute_crc16(const uint8_t *data, uint16_t len);

#endif