twi_soft.h

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#ifndef TWI_SOFT_H_
#define TWI_SOFT_H_
 
    #ifndef F_CPU
        #define F_CPU 12000000UL
    #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_DDR
        #define TWI_SOFT_DDR DDRB 
    #endif
 
    #ifndef TWI_SOFT_PORT
        #define TWI_SOFT_PORT PORTB
    #endif
 
    #ifndef TWI_SOFT_PIN
        #define TWI_SOFT_PIN PINB
    #endif
 
    #ifndef TWI_SOFT_SCL
        #define TWI_SOFT_SCL PINB0
    #endif
 
    #ifndef TWI_SOFT_SDA
        #define TWI_SOFT_SDA PINB1
    #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"

    #ifdef TWI_SOFT_PULLUP_ENABLE
        #define SCL_LOW()  { TWI_SOFT_PORT &= ~(1<<TWI_SOFT_SCL); TWI_SOFT_DDR |= (1<<TWI_SOFT_SCL); }
        #define SDA_LOW()  { TWI_SOFT_PORT &= ~(1<<TWI_SOFT_SDA); TWI_SOFT_DDR |= (1<<TWI_SOFT_SDA); }
        #define SCL_HIGH() { TWI_SOFT_DDR &= ~(1<<TWI_SOFT_SCL);  TWI_SOFT_PORT |= (1<<TWI_SOFT_SCL); }
        #define SDA_HIGH() { TWI_SOFT_DDR &= ~(1<<TWI_SOFT_SDA);  TWI_SOFT_PORT |= (1<<TWI_SOFT_SDA); }
    #else
        #define SCL_LOW()  { TWI_SOFT_PORT &= ~(1<<TWI_SOFT_SCL); TWI_SOFT_DDR |= (1<<TWI_SOFT_SCL); }
        #define SDA_LOW()  { TWI_SOFT_PORT &= ~(1<<TWI_SOFT_SCL); TWI_SOFT_DDR |= (1<<TWI_SOFT_SDA); }
        #define SDA_HIGH() { TWI_SOFT_DDR &= ~(1<<TWI_SOFT_SDA);  TWI_SOFT_PORT &= ~(1<<TWI_SOFT_SCL); }
        #define SCL_HIGH() { TWI_SOFT_DDR &= ~(1<<TWI_SOFT_SCL);  TWI_SOFT_PORT &= ~(1<<TWI_SOFT_SCL); }
    #endif
 
    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_ */