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#ifndef _I2C_MASTER_H

#define _I2C_MASTER_H

#include <inttypes.h>

#define TWI_STATE_MOTOR_TX                      0

#define TWI_STATE_MOTOR_RX                      5

#define TWI_STATE_GYRO_OFFSET_TX        18

extern volatile uint8_t twi_state;

extern volatile uint8_t motor_write;

extern volatile uint8_t motor_read;

extern volatile uint8_t I2C_TransferActive;

extern uint8_t MissingMotor;

#define MAX_MOTORS      12

#define MOTOR_STATE_PRESENT_MASK                0x80

#define MOTOR_STATE_ERROR_MASK                  0x7F

#define MOTOR_STATE_NEW_PROTOCOL_MASK   0x01

#define BLFLAG_TX_COMPLETE              0x01

#define BLFLAG_READ_VERSION     0x02

extern volatile uint8_t BLFlags;

#define BL_READMODE_STATUS  0

#define BL_READMODE_CONFIG      16

typedef struct

{

        uint8_t Version;                        // the version of the BL (0 = old)

        uint8_t SetPoint;                       // written by attitude controller

        uint8_t SetPointLowerBits;      // for higher Resolution of new BLs

        uint8_t State;                          // 7 bit for I2C error counter, highest bit indicates if motor is present

        uint8_t ReadMode;                       // select data to read

        // the following bytes must be exactly in that order!

        uint8_t Current;                        // in 0.1 A steps, read back from BL

        uint8_t MaxPWM;                         // read back from BL is less than 255 if BL is in current limit

        int8_t  Temperature;            // old BL-Ctrl will return a 255 here, the new version the temp. in °C

} __attribute__((packed)) MotorData_t;

extern MotorData_t Motor[MAX_MOTORS];

#define BLCONFIG_REVISION 2

#define MASK_SET_PWM_SCALING            0x01

#define MASK_SET_CURRENT_LIMIT          0x02

#define MASK_SET_TEMP_LIMIT                     0x04

#define MASK_SET_CURRENT_SCALING        0x08

#define MASK_SET_BITCONFIG                      0x10

#define MASK_RESET_CAPCOUNTER           0x20

#define MASK_SET_DEFAULT_PARAMS         0x40

#define MASK_SET_SAVE_EEPROM            0x80

#define BITCONF_REVERSE_ROTATION 0x01

#define BITCONF_RES1 0x02

#define BITCONF_RES2 0x04

#define BITCONF_RES3 0x08

#define BITCONF_RES4 0x10

#define BITCONF_RES5 0x20

#define BITCONF_RES6 0x40

#define BITCONF_RES7 0x80

typedef struct

{

        uint8_t Revision;                       // must be BL_REVISION

        uint8_t SetMask;                        // settings mask

        uint8_t PwmScaling;                     // maximum value of control pwm, acts like a thrust limit

        uint8_t CurrentLimit;           // current limit in A

        uint8_t TempLimit;                      // in °C

        uint8_t CurrentScaling;         // scaling factor for current measurement

        uint8_t BitConfig;                      // see defines above

        uint8_t crc;                            // checksum

}  __attribute__((packed)) BLConfig_t;

extern BLConfig_t BLConfig;

extern volatile uint16_t I2CTimeout;

void I2C_Init(char); // Initialize I2C

#define I2C_Start(start_state) {twi_state = start_state; BLFlags &= ~BLFLAG_TX_COMPLETE; TWCR = (1<<TWSTA) | (1<<TWEN) | (1<<TWINT) | (1<<TWIE);}

#define I2C_Stop(start_state)  {twi_state = start_state; TWCR = (1<<TWEN) | (1<<TWSTO) | (1<<TWINT);}

void I2C_Reset(void); // Reset I2C

#define BLCONFIG_SUCCESS                             0

#define BLCONFIG_ERR_MOTOR_RUNNING       1

#define BLCONFIG_ERR_MOTOR_NOT_EXIST     2

#define BLCONFIG_ERR_HW_NOT_COMPATIBLE   3

#define BLCONFIG_ERR_SW_NOT_COMPATIBLE   4

#define BLCONFIG_ERR_CHECKSUM            5

#define BLCONFIG_ERR_READ_NOT_POSSIBLE   6

uint8_t I2C_WriteBLConfig(uint8_t motor);

uint8_t I2C_ReadBLConfig(uint8_t motor);

#endif