twi_soft.h

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#ifndef TWI_SOFT_H_
#define TWI_SOFT_H_
 
    #ifndef F_CPU
        #define F_CPU 20000000UL
    #endif
 
    #ifndef F_SOFT_TWI
        #define F_SOFT_TWI 100000UL
    #endif  
 
    #ifndef TWI_SOFT_CLOCK_PULSE_US
        #define TWI_SOFT_CLOCK_PULSE_US (float)(1000000.0/(F_SOFT_TWI<<1))
    #endif
 
    #ifndef TWI_SOFT_PULLUP_ENABLE
        #define TWI_SOFT_PULLUP_ENABLE
 
        #ifdef _DOXYGEN_    // Used for documentation, can be ignored
            #define TWI_SOFT_PULLUP_ENABLE
        #endif
    #endif
 
    #ifndef TWI_SOFT_PORT
        #define TWI_SOFT_PORT PORTD
    #endif
 
    #ifndef TWI_SOFT_SCL
        #define TWI_SOFT_SCL SET_PIN(2, _bm)
        
        #ifndef TWI_SOFT_SCL_CTRL
            #define TWI_SOFT_SCL_CTRL SET_PIN(2, CTRL)
        #endif
    #endif
 
    #ifndef TWI_SOFT_SDA
         #define TWI_SOFT_SDA SET_PIN(3, _bm)
         
         #ifndef TWI_SOFT_SDA_CTRL
            #define TWI_SOFT_SDA_CTRL SET_PIN(3, CTRL)
         #endif
    #endif

    #ifndef TWI_SOFT_STATUS
        #define TWI_SOFT_STATUS_BUS_INIT_COMPLETE 0x00 
        #define TWI_SOFT_STATUS_TRANSMIT          0x01 
        #define TWI_SOFT_STATUS_RECEIVE           0x02 
        #define TWI_SOFT_STATUS_BUS_ERROR         0xFF 
    #endif
 
    #ifndef TWI_SOFT_BLOCK_IE
        // #define TWI_SOFT_BLOCK_IE
 
        #ifdef _DOXYGEN_    // Used for documentation, can be ignored
            #define TWI_SOFT_BLOCK_IE
        #endif
    #endif
 
    #include <limits.h>
    #include <avr/io.h>
    #include <util/delay.h>
 
    #ifdef TWI_SOFT_BLOCK_IE
        #include <avr/interrupt.h>
    #endif
 
    #include "../../../common/defines/TWI_defines.h"
    #include "../../../common/enums/TWI_enums.h"
    #include "../../../common/macros/PORT_macros.h"

    #define SCL_LOW()  { TWI_SOFT_PORT.OUTCLR = TWI_SOFT_SCL; TWI_SOFT_PORT.DIRSET = TWI_SOFT_SCL; }
    #define SDA_LOW()  { TWI_SOFT_PORT.OUTCLR = TWI_SOFT_SDA; TWI_SOFT_PORT.DIRSET = TWI_SOFT_SDA; }
    #define SCL_HIGH() { TWI_SOFT_PORT.DIRCLR = TWI_SOFT_SCL; TWI_SOFT_PORT.OUTCLR = TWI_SOFT_SCL; }
    #define SDA_HIGH() { TWI_SOFT_PORT.DIRCLR = TWI_SOFT_SDA; TWI_SOFT_PORT.OUTCLR = TWI_SOFT_SDA; }
 
    unsigned char twi_soft_init(void);
             void twi_soft_disable(void);
    unsigned char twi_soft_status(void);
 
    TWI_Error twi_soft_start(void);
            void twi_soft_stop(void);
    TWI_Error twi_soft_address(unsigned char address, TWI_Operation operation);
    TWI_Error twi_soft_set(unsigned char data);
    TWI_Error twi_soft_get(unsigned char *data, TWI_Acknowledge acknowledge);
 
#endif /* TWI_SOFT_H_ */