用c语言并且用IO模拟写一个SH367309的TWI驱动程序代码

以下是一个基础的SH367309 TWI驱动程序代码，使用IO模拟：

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define SDA_PIN 2
#define SCL_PIN 3

#define DELAY() {volatile int i = 0; for(i=0; i<50; i++);}

// Function to set the direction of SDA and SCL pins
void set_pin_direction(int pin, bool is_output)
{
    if(is_output)
    {
        // Set pin as output
        // Write a '1' to the corresponding bit in the DDR register
        DDRB |= (1 << pin);
    }
    else
    {
        // Set pin as input
        // Write a '0' to the corresponding bit in the DDR register
        DDRB &= ~(1 << pin);
    }
}

// Function to set the state of the SDA pin
void set_sda(bool value)
{
    if(value)
    {
        // Set SDA to '1'
        // Write a '1' to the corresponding bit in the PORT register
        PORTB |= (1 << SDA_PIN);
    }
    else
    {
        // Set SDA to '0'
        // Write a '0' to the corresponding bit in the PORT register
        PORTB &= ~(1 << SDA_PIN);
    }
}

// Function to get the state of the SDA pin
bool get_sda()
{
    // Read the value of the SDA pin
    // Read the corresponding bit in the PIN register
    return (PINB & (1 << SDA_PIN));
}

// Function to set the state of the SCL pin
void set_scl(bool value)
{
    if(value)
    {
        // Set SCL to '1'
        // Write a '1' to the corresponding bit in the PORT register
        PORTB |= (1 << SCL_PIN);
    }
    else
    {
        // Set SCL to '0'
        // Write a '0' to the corresponding bit in the PORT register
        PORTB &= ~(1 << SCL_PIN);
    }
}

// Function to generate a clock pulse on the SCL pin
void clock_pulse()
{
    // Set SCL to '1'
    set_scl(true);
    // Wait for a short period of time
    DELAY();
    // Set SCL to '0'
    set_scl(false);
    // Wait for a short period of time
    DELAY();
}

// Function to send a start condition on the bus
void send_start_condition()
{
    // Set SDA to '1'
    set_sda(true);
    // Wait for a short period of time
    DELAY();
    // Set SCL to '1'
    set_scl(true);
    // Wait for a short period of time
    DELAY();
    // Set SDA to '0'
    set_sda(false);
    // Wait for a short period of time
    DELAY();
    // Set SCL to '0'
    set_scl(false);
    // Wait for a short period of time
    DELAY();
}

// Function to send a stop condition on the bus
void send_stop_condition()
{
    // Set SDA to '0'
    set_sda(false);
    // Wait for a short period of time
    DELAY();
    // Set SCL to '1'
    set_scl(true);
    // Wait for a short period of time
    DELAY();
    // Set SDA to '1'
    set_sda(true);
    // Wait for a short period of time
    DELAY();
}

// Function to write a byte to the bus
bool write_byte(unsigned char data)
{
    int i;
    bool ack;

    // Write each bit in the byte to the bus
    for(i=7; i>=0; i--)
    {
        // Set SDA to the value of the current bit
        set_sda((data & (1 << i)) != 0);
        // Generate a clock pulse
        clock_pulse();
    }

    // Wait for the ACK from the receiver
    set_pin_direction(SDA_PIN, false);
    set_sda(true);
    clock_pulse();
    ack = !get_sda();
    set_pin_direction(SDA_PIN, true);

    return ack;
}

// Function to read a byte from the bus
unsigned char read_byte(bool ack)
{
    int i;
    unsigned char data = 0;

    // Read each bit from the bus
    for(i=7; i>=0; i--)
    {
        // Generate a clock pulse
        clock_pulse();
        // Read the value of SDA
        if(get_sda())
        {
            // Set the current bit to '1'
            data |= (1 << i);
        }
    }

    // Send an ACK or a NACK to the sender
    set_sda(!ack);
    clock_pulse();

    return data;
}

// Function to initialize the TWI bus
void twi_init()
{
    set_pin_direction(SDA_PIN, true);
    set_pin_direction(SCL_PIN, true);
}

// Function to send a TWI message on the bus
bool twi_send_message(unsigned char address, unsigned char* data, int length)
{
    int i;
    bool ack;

    // Send a start condition
    send_start_condition();

    // Send the device address with the write bit set
    ack = write_byte((address << 1) | 0x00);

    // Send the data bytes
    for(i=0; i<length; i++)
    {
        ack &= write_byte(data[i]);
    }

    // Send a stop condition
    send_stop_condition();

    return ack;
}

// Function to receive a TWI message from the bus
bool twi_receive_message(unsigned char address, unsigned char* data, int length)
{
    int i;
    bool ack;

    // Send a start condition
    send_start_condition();

    // Send the device address with the read bit set
    ack = write_byte((address << 1) | 0x01);

    // Read the data bytes
    for(i=0; i<length; i++)
    {
        data[i] = read_byte(i < length - 1);
    }

    // Send a stop condition
    send_stop_condition();

    return ack;
}

int main()
{
    unsigned char data[3];
    bool ack;
    int i;

    // Initialize the TWI bus
    twi_init();

    // Send a message to the device with address 0x50
    data[0] = 0x00;
    data[1] = 0x12;
    data[2] = 0x34;
    ack = twi_send_message(0x50, data, 3);

    if(ack)
    {
        printf("Data sent successfully!\n");
    }
    else
    {
        printf("Error sending data!\n");
    }

    // Receive a message from the device with address 0x50
    ack = twi_receive_message(0x50, data, 3);

    if(ack)
    {
        printf("Data received successfully:\n");
        for(i=0; i<3; i++)
        {
            printf("data[%d] = 0x%02X\n", i, data[i]);
        }
    }
    else
    {
        printf("Error receiving data!\n");
    }

    return 0;
}

需要注意的是，这段代码是基于假定你在使用ATmega328P微控制器。如果使用其他微控制器，需要根据具体的IO引脚和寄存器地址进行修改。