#ifndef OWI_H
#define OWI_H

#include "r_cg_macrodriver.h"
#include "r_cg_serial.h"
#include "r_cg_port.h"
#include <stdint.h>

/* =========================================================
 * OWI GPIO: P70 (P7.0) + HW Open-Drain (POM7.0)
 * ========================================================= */
#define OWI_PORT_P     P7      /* port data (read/write latch) */
#define OWI_PORT_PM    PM7     /* port mode (1=input, 0=output) */
#define OWI_PORT_PU    PU7     /* pull-up enable */
#define OWI_PORT_POM   POM7    /* open-drain enable */

/* P70 = bit0 */
#define OWI_PIN_MASK          (1u << 0)

/* =========================================================
 * Timing
 * ========================================================= */
#define OWI_BIT_PERIOD_US     100u
#define TBIT                  OWI_BIT_PERIOD_US
#define TLOW_0                (TBIT * 0.75)
#define TLOW_1                (TBIT * 0.25)
#define TSTOP_LOW             (TBIT * 2)
#define TIDLE                 (TBIT * 3)
#define TSTART_HOLD           50u
#define SECURE_HIGH           250u
#define SECURE_TOGGLE_COUNT   3u
#define SECURE_TOGGLE_LOW     40u
#define SECURE_TOGGLE_HIGH    60u

#ifndef RAM_BYTES
#define RAM_BYTES 3
#endif

#define OWI_IO_MAX_BYTES 64u

typedef struct {
    uint8_t  ok;
    uint8_t  timeout;
    uint16_t read_len;
    uint8_t  data[OWI_IO_MAX_BYTES];
    uint16_t timeout_byte_index;
    uint8_t  timeout_bit_index;
} owi_io_result_t;

/* =========================================================
 * API
 * ========================================================= */

void GPIO_Clear(void);
void GPIO_Input(void);
int  GPIO_Read(void);

void OWI_Init(uint32_t bit_time_us);
void OWI_Start(void);
void OWI_Stop(void);
void OWI_SecureStop(void);

void    OWI_WriteBit(int bit);
void    OWI_WriteByte(uint8_t data);
uint8_t OWI_ReadBit(void);
uint8_t OWI_ReadByte(void);

void OWI_T_ReadBytesAndPrint(int length);
void OWI_ReadBytesAndPrint(int length, uint8_t id);

void OWI_T_CommandMode(const uint8_t *tx_data, uint8_t tx_len, uint8_t id);
void OWI_CommandMode  (const uint8_t *tx_data, uint8_t tx_len, uint8_t id);
void OWI_A_CommandMode(const uint8_t *tx_data, uint8_t tx_len, uint8_t id);

void OWI_T_CommandModeRaw(const uint8_t *tx_data, uint8_t tx_len, uint8_t id, owi_io_result_t *r);
void OWI_CommandModeRaw  (const uint8_t *tx_data, uint8_t tx_len, uint8_t id, owi_io_result_t *r);
void OWI_ReadBytesRaw    (int length, uint8_t id, owi_io_result_t *r);

void OWI_disable(void);
void GPIO_ForceHighKick(void);

uint8_t  OWI_HasTimeout(void);
void     OWI_ClearTimeout(void);
uint16_t OWI_GetLastTimeoutByteIndex(void);
uint8_t  OWI_GetLastTimeoutBitIndex(void);

#endif /* OWI_H */