C文件：

-------------------------------------------------------------------------------------

#include"Si2c.h"

//Bus driver implementation
Si2c_device         Si2c_device_nu[MY_SI2C_DEVICE_NU];

enum Si2c_err MY_Si2c_err;

void Si2c_delay( unsigned int dy ) {
    unsigned int        i     = 0;
    for( i = 0; i < dy; i++ )
        ;
}
//
void My_Si2c_GPIO_init( void ) {
    rcu_periph_clock_enable( RCU_GPIOB );
    gpio_init( GPIOB, GPIO_MODE_OUT_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_12 ); //scl
    gpio_init( GPIOB, GPIO_MODE_OUT_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_13 ); //sda
    gpio_bit_write( GPIOB, GPIO_PIN_13, SET );
    gpio_bit_write( GPIOB, GPIO_PIN_12, SET );
    Si2c_delay( MY_SI2C_DELAY );
    Si2c_delay( MY_SI2C_DELAY );
}

//
//1
void My_Si2c_SDA_set( void ) {
    gpio_bit_write( GPIOB, GPIO_PIN_13, SET );
}

//
//0
void My_Si2c_SDA_reset( void ) {
    gpio_bit_write( GPIOB, GPIO_PIN_13, RESET );
}

//
//1
void My_Si2c_SCL_set( void ) {
    gpio_bit_write( GPIOB, GPIO_PIN_12, SET );
}

//
//0
void My_Si2c_SCL_reset( void ) {
    gpio_bit_write( GPIOB, GPIO_PIN_12, RESET );
}

//if STM32
//In open drain mode, read access to the input data register yields I/O status
//if LPCxxx
//The software can read the state of all GPIO pins except those selected as analog input or output in the I/O configuration logic
//Outside. To read the state of a pin, it is not necessary to select GPIO in the I/O configuration.
//if STC of 51
//Open-drain, internal pull-up resistance is disconnected
//Open leakage mode can read the external state and output (high level or low current)
//Flat). If you want to read the external state correctly or need to output high level, you need external
//Add pull resistance, otherwise can not read the external state, also can not output high level.
unsigned char My_Si2c_SCL_read( void ) {
    return gpio_input_bit_get( GPIOB, GPIO_PIN_12 );
}

unsigned char My_Si2c_SDA_read( void ) {
    return gpio_input_bit_get( GPIOB, GPIO_PIN_13 );
}

//Check the reply
unsigned char MY_Si2c_check_reply( unsigned char nu ) {
    //SCL  ____---____
    //SDA  ????ACK????
    unsigned char     tmp;
    Si2c_delay( MY_SI2C_DELAY / 2 );
    Si2c_device_nu[nu].Si2c_SDA_set();
    Si2c_delay( MY_SI2C_DELAY / 2 );
    Si2c_device_nu[nu].Si2c_SCL_set();
    Si2c_delay( MY_SI2C_DELAY / 2 );
    if( 0 == Si2c_device_nu[nu].Si2c_SDA_read() ) {
        tmp                                 = S_OK;
    } else {
        tmp                                 = bus_noack;
    }
    Si2c_delay( MY_SI2C_DELAY / 2 );
    Si2c_device_nu[nu].Si2c_SCL_reset();
    return tmp;
}

//Start signal
unsigned char MY_Si2c_start( unsigned char nu ) {
    //SCL     --------------------------_________
    //SDA     --------------------_______________
    if( 1 == Si2c_device_nu[nu].Si2c_SCL_read() && 1 == Si2c_device_nu[nu].Si2c_SDA_read() ) {
        Si2c_device_nu[nu].Si2c_SDA_reset();
        Si2c_delay( MY_SI2C_DELAY / 2 );
        Si2c_device_nu[nu].Si2c_SCL_reset();
        Si2c_delay( MY_SI2C_DELAY / 2 );
    } else {
        return bus_err;
    }
    return S_OK;
}

//Send reply signal
void MY_Si2c_send_ack( unsigned char nu ) {
    //SCL ____
    //SDA ----
    Si2c_device_nu[nu].Si2c_SDA_reset();
    Si2c_delay( MY_SI2C_DELAY / 2 );
    Si2c_device_nu[nu].Si2c_SCL_set();
    Si2c_delay( MY_SI2C_DELAY );
    Si2c_device_nu[nu].Si2c_SCL_reset();
    Si2c_delay( MY_SI2C_DELAY / 2 );
    Si2c_device_nu[nu].Si2c_SDA_set();
    //SCL ____
    //SDA ----
}

void MY_Si2c_stop( unsigned char nu ) {
    //SCL  ______-----------------
    //SDA  ???______________------
    Si2c_delay( MY_SI2C_DELAY / 2 );
    Si2c_device_nu[nu].Si2c_SDA_reset();
    Si2c_delay( MY_SI2C_DELAY / 2 );
    Si2c_device_nu[nu].Si2c_SCL_set();
    Si2c_delay( MY_SI2C_DELAY / 2 );
    Si2c_device_nu[nu].Si2c_SDA_set();
    Si2c_delay( MY_SI2C_DELAY );
    //SCL  --------
    //SDA  --------
}

void MY_Si2c_send_nack( unsigned char nu ) {
    //SCL ____
    //SDA ----
    Si2c_device_nu[nu].Si2c_SDA_set();
    Si2c_delay( MY_SI2C_DELAY / 2 );
    Si2c_device_nu[nu].Si2c_SCL_set();
    Si2c_delay( MY_SI2C_DELAY );
    Si2c_device_nu[nu].Si2c_SCL_reset();
    Si2c_delay( MY_SI2C_DELAY / 2 );
}

unsigned char MY_Si2c_addressing( unsigned char nu, unsigned char addr,
                                  unsigned char rw ) {
    //SCL  __---___---
    //SDA  C-----C-------
    unsigned char     i     = 0;
    unsigned char     tmp = ( addr << 1 ) | rw;
    for( i = 0; i < 8; i++ ) {
        if( tmp & 0x80 ) {
            Si2c_device_nu[nu].Si2c_SDA_set();
        } else {
            Si2c_device_nu[nu].Si2c_SDA_reset();
        }
        tmp <<= 1;
        Si2c_delay( MY_SI2C_DELAY / 2 );
        Si2c_device_nu[nu].Si2c_SCL_set();
        Si2c_delay( MY_SI2C_DELAY / 2 );
        Si2c_device_nu[nu].Si2c_SCL_reset();
    }
    //SCL  ____
    //SDA  ????
    if( S_OK == MY_Si2c_check_reply( nu ) ) {
        return S_OK;
    } else {
        return bus_noack;
    }
    //SCL ____
    //SDA ????
}

void MY_Si2c_send_char( unsigned char nu, unsigned char tmp ) {
    unsigned char     i     = 0;
    for( i = 0; i < 8; i++ ) {
        if( tmp & 0x80 ) {
            Si2c_device_nu[nu].Si2c_SDA_set();
        } else {
            Si2c_device_nu[nu].Si2c_SDA_reset();
        }
        Si2c_delay( MY_SI2C_DELAY / 2 );
        Si2c_device_nu[nu].Si2c_SCL_set();
        Si2c_delay( MY_SI2C_DELAY );
        Si2c_device_nu[nu].Si2c_SCL_reset();
        if( i == 7 ) {
            Si2c_device_nu[nu].Si2c_SDA_set();
        }
        tmp <<= 1;
    }
}

void MY_Si2c_read_char( unsigned char nu, unsigned char* data ) {
    //SCL ____
    //SDA ????
    unsigned char     i     = 0;
    Si2c_delay( MY_SI2C_DELAY / 2 );
    for( i = 0; i < 8; i++ ) {
        *data <<= 1;
        Si2c_device_nu[nu].Si2c_SCL_set();
        Si2c_delay( MY_SI2C_DELAY / 2 );
        if( 1 == Si2c_device_nu[nu].Si2c_SDA_read() ) {
            ( *data ) |= 1;
        }
        Si2c_device_nu[nu].Si2c_SCL_reset();
        Si2c_delay( MY_SI2C_DELAY / 2 );
    }
}

unsigned char MY_Si2c_Multibyte_sending( unsigned char nu, unsigned char addr,
        unsigned char* buffer, unsigned char len ) {
    unsigned char     i     = 0;
    MY_Si2c_start( nu );
    if( S_OK == MY_Si2c_addressing( nu, addr, MY_SI2C_WRITE ) ) {
        //SCL ____
        //SDA ????
        for( i = 0; i < len; i++ ) {
            MY_Si2c_send_char( nu, buffer[i] );
            if( S_OK != MY_Si2c_check_reply( nu ) ) {
                Si2c_device_nu[nu].Si2c_SCL_set();
                return bus_noack;
            }
        }
    } else {
        Si2c_device_nu[nu].Si2c_SCL_set();
        return bus_noack;
    }
    MY_Si2c_stop( nu );
    return S_OK;
}

unsigned char MY_Si2c_Multibyte_reading( unsigned char nu, unsigned char addr,
        unsigned char* buffer, unsigned char len ) {
    unsigned char     i     = 0;
    MY_Si2c_start( nu );
    if( S_OK == MY_Si2c_addressing( nu, addr, MY_SI2C_READ ) ) {
        //SCL ____
        //SDA ????
        for( i = 0; i < len; i++ ) {
            MY_Si2c_read_char( nu, &buffer[i] );
            //SCL ____
            //SDA ????
            if( i == ( len - 1 ) )
                MY_Si2c_send_nack( nu );
            else
                MY_Si2c_send_ack( nu );
            //SCL ____
            //SDA ----
        }
    } else {
        return bus_noack;
    }
    MY_Si2c_stop( nu );
    return S_OK;
}

unsigned char MY_Si2c_writeandread( unsigned char nu, unsigned char addr, unsigned char* mregister,
                                    unsigned char rsize, unsigned char* buff, unsigned char bsize ) {
    unsigned char     i     = 0;
    MY_Si2c_start( nu );
    if( S_OK == MY_Si2c_addressing( nu, addr, MY_SI2C_WRITE ) ) {
        //SCL ____
        //SDA ????
        for( i = 0; i < rsize; i++ ) {
            MY_Si2c_send_char( nu, mregister[i] );
            if( S_OK != MY_Si2c_check_reply( nu ) ) {
                return bus_noack;
            }
        }
        //SCL ____
        //SDA ----
        Si2c_delay( MY_SI2C_DELAY / 2 );
        Si2c_device_nu[nu].Si2c_SCL_set();
        Si2c_delay( MY_SI2C_DELAY / 2 );
        Si2c_device_nu[nu].Si2c_SDA_reset();
        Si2c_delay( MY_SI2C_DELAY / 2 );
        Si2c_device_nu[nu].Si2c_SCL_reset();
        Si2c_delay( MY_SI2C_DELAY / 2 );
        if( S_OK != MY_Si2c_addressing( nu, addr, MY_SI2C_READ ) )
            return bus_noack;
        for( i = 0; i < bsize; i++ ) {
            MY_Si2c_read_char( nu, &buff[i] );
            if( i == ( bsize - 1 ) )
                MY_Si2c_send_nack( nu );
            else
                MY_Si2c_send_ack( nu );
        }
    } else {
        return bus_noack;
    }
    MY_Si2c_stop( nu );
    return S_OK;
}

void MY_Si2c_unlockbus( unsigned char nu ) {
    unsigned char i = 0;
    Si2c_device_nu[nu].Si2c_SDA_set();

Si2c_delay( MY_SI2C_DELAY * 2 );
    for( i = 0; i < 9; i++ ) {
        Si2c_device_nu[nu].Si2c_SCL_set();
        Si2c_delay( MY_SI2C_DELAY * 2 );
        Si2c_device_nu[nu].Si2c_SCL_reset();
        Si2c_delay( MY_SI2C_DELAY * 2 );
    }
    Si2c_device_nu[nu].Si2c_SCL_set();
    Si2c_delay( MY_SI2C_DELAY * 4 );
}

void My_Si2c_Querying_secondary_Devices( unsigned char nu, unsigned char* myaddrs ) {
//7F
    unsigned char i = 0;
    unsigned char tmp = 0;
    unsigned char j = 0;
    for( i = 0; i < ( 0x7F + 1 ); i++ ) {
        MY_Si2c_start( nu );
        tmp = MY_Si2c_addressing( nu, i, MY_SI2C_READ );
        MY_Si2c_stop( nu );
        if( S_OK == tmp ) {
            myaddrs[j++] = i;
        }
        Si2c_delay( MY_SI2C_DELAY );
    }
}

void Si2c_initial( void ) {
    Si2c_device_nu[0].Si2c_GPIO_init = My_Si2c_GPIO_init;
    Si2c_device_nu[0].Si2c_SDA_set = My_Si2c_SDA_set;
    Si2c_device_nu[0].Si2c_SDA_reset = My_Si2c_SDA_reset;
    Si2c_device_nu[0].Si2c_SDA_read = My_Si2c_SDA_read;
    Si2c_device_nu[0].Si2c_SCL_set = My_Si2c_SCL_set;
    Si2c_device_nu[0].Si2c_SCL_reset = My_Si2c_SCL_reset;
    Si2c_device_nu[0].Si2c_SCL_read = My_Si2c_SCL_read;
    Si2c_device_nu[0].Si2c_GPIO_init();
}

H文件

----------------------------------------------------------------------------------

#ifndef __MY_SI2C__
#define __MY_SI2C__

#include "gd32f30x_gpio.h"
#include "gd32f30x_rcu.h"

#define MY_SI2C_DEVICE_NU 2  //The bus number
#define MY_SI2C_READ 1
#define MY_SI2C_WRITE 0

#define MY_SI2C_ADDR1 (0x68)    //Device address

#define MY_SI2C_DELAY 150 //The bus delay

#define Si2c_LOG

//Bus error type
enum Si2c_err {
    S_OK = 0,
    bus_err,
    bus_busy,
    bus_noack,
};

extern enum Si2c_err MY_Si2c_err;

//Bus driver implementation
typedef struct {
    void ( *Si2c_GPIO_init )( void );
    void ( *Si2c_SDA_set )( void );
    void ( *Si2c_SDA_reset )( void );
    void ( *Si2c_SCL_set )( void );
    void ( *Si2c_SCL_reset )( void );
    unsigned char ( *Si2c_SCL_read )( void );
    unsigned char ( *Si2c_SDA_read )( void );
} Si2c_device;

//Bus driver implementation
extern Si2c_device Si2c_device_nu[MY_SI2C_DEVICE_NU];

void Si2c_delay( unsigned int dy );
void My_Si2c_GPIO_init( void );
void My_Si2c_SDA_set( void );
void My_Si2c_SDA_reset( void );
void My_Si2c_SCL_set( void );
void My_Si2c_SCL_reset( void );
unsigned char My_Si2c_SCL_read( void );
unsigned char My_Si2c_SDA_read( void );

//Check the reply
unsigned char MY_Si2c_check_reply( unsigned char nu );

//Start signal
unsigned char MY_Si2c_start( unsigned char nu );

//Send reply signal
void MY_Si2c_send_ack( unsigned char nu );
void MY_Si2c_stop( unsigned char nu );
void MY_Si2c_send_nack( unsigned char nu );
unsigned char MY_Si2c_addressing( unsigned char nu, unsigned char addr, unsigned char rw );
void MY_Si2c_send_char( unsigned char nu, unsigned char tmp );
void MY_Si2c_read_char( unsigned char nu, unsigned char* data );
unsigned char MY_Si2c_Multibyte_sending( unsigned char nu, unsigned char addr, unsigned char* buffer, unsigned char len );
unsigned char MY_Si2c_Multibyte_reading( unsigned char nu, unsigned char addr, unsigned char* buffer, unsigned char len );
unsigned char MY_Si2c_writeandread( unsigned char nu, unsigned char addr, unsigned char* mregister, unsigned char rsize, unsigned char* buff, unsigned char bsize );
void My_Si2c_Querying_secondary_Devices( unsigned char nu, unsigned char* myaddrs );
void Si2c_initial( void );
void MY_Si2c_unlockbus( unsigned char nu );

#endif

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