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#ifndef DRIVE_H
#define DRIVE_H
#include <stdbool.h>
#include <stdint.h>
#define DRIVE_LOOKAHEAD 8
extern const uint8_t SECTORS_PER_TRACK[40];
extern const uint8_t BITRATE_PER_TRACK[40];
extern const uint8_t GCR_CONV[16];
typedef struct drive_s {
volatile bool spinning;
uint8_t timer;
uint8_t *image;
volatile uint8_t track;
volatile uint8_t halftrack;
volatile uint32_t image_ptr;
volatile uint8_t sector;
uint8_t byte;
uint16_t gcr_word;
uint8_t gcr_bits;
uint8_t bit_counter;
uint8_t gap_remain;
uint8_t sync_remain;
uint8_t header_remain;
uint16_t data_remain;
uint8_t data_checksum;
uint8_t current_idx;
uint8_t lookahead_idx;
volatile uint16_t unlatched[DRIVE_LOOKAHEAD];
volatile uint16_t latched[DRIVE_LOOKAHEAD];
volatile bool sync[DRIVE_LOOKAHEAD];
volatile bool byte_ready[DRIVE_LOOKAHEAD];
} drive_t;
void drive_init(drive_t *drive);
void drive_step_up(drive_t *drive);
void drive_step_down(drive_t *drive);
bool drive_advance(drive_t *drive, uint8_t cycles);
void drive_cycle(drive_t *drive);
#endif
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