diff --git a/cores/arduino/HardwareI2C.h b/cores/arduino/HardwareI2C.h
new file mode 100644
index 0000000..25bf40e
--- /dev/null
+++ b/cores/arduino/HardwareI2C.h
@@ -0,0 +1,43 @@
+/*
+  Copyright (c) 2016 Arduino LLC.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#pragma once
+
+#include <inttypes.h>
+#include "Stream.h"
+
+class HardwareI2C : public Stream
+{
+  public:
+    virtual void begin() = 0;
+    virtual void begin(uint8_t address) = 0;
+    virtual void end() = 0;
+
+    virtual void setClock(uint32_t freq) = 0;
+  
+    virtual void beginTransmission(uint8_t address) = 0;
+    virtual uint8_t endTransmission(bool stopBit) = 0;
+    virtual uint8_t endTransmission(void) = 0;
+
+    virtual uint8_t requestFrom(uint8_t address, size_t len, bool stopBit) = 0;
+    virtual uint8_t requestFrom(uint8_t address, size_t len) = 0;
+
+    virtual void onReceive(void(*)(int)) = 0;
+    virtual void onRequest(void(*)(void)) = 0;
+};
+
diff --git a/cores/arduino/RingBuffer.h b/cores/arduino/RingBuffer.h
index 2d58dca..eca8e8b 100644
--- a/cores/arduino/RingBuffer.h
+++ b/cores/arduino/RingBuffer.h
@@ -27,7 +27,7 @@
 // using a ring buffer (I think), in which head is the index of the location
 // to which to write the next incoming character and tail is the index of the
 // location from which to read.
-#define SERIAL_BUFFER_SIZE 64
+#define RING_BUFFER_SIZE 64
 
 template <int N>
 class RingBufferN
@@ -51,7 +51,7 @@ class RingBufferN
     int nextIndex(int index);
 };
 
-typedef RingBufferN<SERIAL_BUFFER_SIZE> RingBuffer;
+typedef RingBufferN<RING_BUFFER_SIZE> RingBuffer;
 
 
 template <int N>
diff --git a/libraries/Wire/keywords.txt b/libraries/Wire/keywords.txt
new file mode 100644
index 0000000..74f8557
--- /dev/null
+++ b/libraries/Wire/keywords.txt
@@ -0,0 +1,35 @@
+#######################################
+# Syntax Coloring Map For Wire
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+
+begin	KEYWORD2
+setClock	KEYWORD2
+setClockStretchLimit	KEYWORD2
+beginTransmission	KEYWORD2
+endTransmission	KEYWORD2
+requestFrom	KEYWORD2
+send	KEYWORD2
+receive	KEYWORD2
+onReceive	KEYWORD2
+onRequest	KEYWORD2
+
+#######################################
+# Instances (KEYWORD2)
+#######################################
+
+Wire	KEYWORD2
+Wire1	KEYWORD2
+Wire2	KEYWORD2
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+
diff --git a/libraries/Wire/library.properties b/libraries/Wire/library.properties
new file mode 100644
index 0000000..6818aa1
--- /dev/null
+++ b/libraries/Wire/library.properties
@@ -0,0 +1,9 @@
+name=Wire
+version=1.0.0
+author=Bigbits
+maintainer=
+sentence=Allows the communication between devices or sensors connected via Two Wire Interface Bus. For k210 boards. 
+paragraph=
+category=Signal Input/Output
+url=http://arduino.cc/en/Reference/Wire
+architectures=riscv
diff --git a/libraries/Wire/src/Wire.cpp b/libraries/Wire/src/Wire.cpp
new file mode 100644
index 0000000..e51de9d
--- /dev/null
+++ b/libraries/Wire/src/Wire.cpp
@@ -0,0 +1,458 @@
+#include "Arduino.h"
+#include "pins_arduino.h"
+#include "Wire.h"
+
+#include "fpioa.h"
+#include "i2c.h"
+
+static int maix_i2c_slave_irq(void *userdata);
+
+TwoWire::TwoWire(i2c_device_number_t i2c_device)
+{
+    _i2c_num = i2c_device;
+    switch(i2c_device)
+    {
+        case I2C_DEVICE_0:
+            sda_func = FUNC_I2C0_SDA;
+            scl_func = FUNC_I2C0_SCLK;
+            break;
+        case I2C_DEVICE_1:
+            sda_func = FUNC_I2C1_SDA;
+            scl_func = FUNC_I2C1_SCLK;
+            break;
+        case I2C_DEVICE_2:
+            sda_func = FUNC_I2C2_SDA;
+            scl_func = FUNC_I2C2_SCLK;
+            break;
+        default:
+            break;
+    }
+
+}
+
+TwoWire::~TwoWire()
+{
+    //clear
+}
+
+void 
+TwoWire::begin(uint8_t sda, uint8_t scl, uint32_t frequency)
+{
+    i2c_clk = frequency;
+    fpioa_set_function(sda, sda_func);
+    fpioa_set_function(scl, scl_func);
+    volatile i2c_t *i2c_adapter = i2c[_i2c_num];
+    uint8_t speed_mode = I2C_CON_SPEED_STANDARD;
+    //i2c_clk_init
+    sysctl_clock_enable((sysctl_clock_t)(SYSCTL_CLOCK_I2C0 + _i2c_num));
+    sysctl_clock_set_threshold((sysctl_threshold_t)(SYSCTL_THRESHOLD_I2C0 + _i2c_num), 3);
+
+    uint32_t v_i2c_freq = sysctl_clock_get_freq((sysctl_clock_t)(SYSCTL_CLOCK_I2C0 + _i2c_num));
+    uint16_t v_period_clk_cnt = floor( (v_i2c_freq*1.0 / i2c_clk / 2) + 0.5 );
+    
+
+    if(v_period_clk_cnt <= 6)
+        v_period_clk_cnt = 6;
+    if(v_period_clk_cnt >= 65525)//65535-10
+        v_period_clk_cnt = 65525;
+    if((i2c_clk>100000) && (i2c_clk<=1000000))
+        speed_mode = I2C_CON_SPEED_FAST;
+    else
+        speed_mode = I2C_CON_SPEED_HIGH;
+    i2c_adapter->enable = 0;
+    i2c_adapter->con = I2C_CON_MASTER_MODE | I2C_CON_SLAVE_DISABLE | I2C_CON_RESTART_EN |
+                       (address_width == 10 ? I2C_CON_10BITADDR_SLAVE : 0) | I2C_CON_SPEED(speed_mode);
+    i2c_adapter->ss_scl_hcnt = I2C_SS_SCL_HCNT_COUNT(v_period_clk_cnt);
+    i2c_adapter->ss_scl_lcnt = I2C_SS_SCL_LCNT_COUNT(v_period_clk_cnt);
+
+    i2c_adapter->intr_mask = 0;
+    i2c_adapter->dma_cr = 0x3;
+    i2c_adapter->dma_rdlr = 0;
+    i2c_adapter->dma_tdlr = 4;
+    i2c_adapter->enable = I2C_ENABLE_ENABLE;
+    is_master_mode = true;
+    
+    i2c_tx_buff = new RingBuffer();
+    i2c_rx_buff = new RingBuffer();
+
+
+}
+    
+void 
+TwoWire::begin(uint16_t slave_address, uint8_t sda, uint8_t scl)
+{
+    fpioa_set_function(sda, sda_func);
+    fpioa_set_function(scl, scl_func);
+
+    volatile i2c_t *i2c_adapter = i2c[_i2c_num];
+    
+    sysctl_clock_enable((sysctl_clock_t)(SYSCTL_CLOCK_I2C0 + _i2c_num));
+    sysctl_clock_set_threshold((sysctl_threshold_t)(SYSCTL_THRESHOLD_I2C0 + _i2c_num), 3);
+
+    i2c_adapter->enable = 0;
+    i2c_adapter->con =  I2C_CON_SPEED(1) | I2C_CON_STOP_DET_IFADDRESSED;
+    i2c_adapter->ss_scl_hcnt = I2C_SS_SCL_HCNT_COUNT(37);
+    i2c_adapter->ss_scl_lcnt = I2C_SS_SCL_LCNT_COUNT(40);
+    i2c_adapter->sar = I2C_SAR_ADDRESS(slave_address);
+    i2c_adapter->rx_tl = I2C_RX_TL_VALUE(0);
+    i2c_adapter->tx_tl = I2C_TX_TL_VALUE(0);
+    i2c_adapter->intr_mask = I2C_INTR_MASK_RX_FULL | I2C_INTR_MASK_START_DET | I2C_INTR_MASK_STOP_DET | I2C_INTR_MASK_RD_REQ;
+
+    plic_set_priority((plic_irq_t)(IRQN_I2C0_INTERRUPT + _i2c_num), 1);
+    plic_irq_register((plic_irq_t)(IRQN_I2C0_INTERRUPT + _i2c_num), maix_i2c_slave_irq, this);
+    plic_irq_enable((plic_irq_t)(IRQN_I2C0_INTERRUPT + _i2c_num));
+
+    i2c_adapter->enable = I2C_ENABLE_ENABLE;
+    is_master_mode = false;
+
+    i2c_tx_buff = new RingBuffer();
+    i2c_rx_buff = new RingBuffer();
+
+}  
+void
+TwoWire::setTimeOut(uint16_t timeOutMillis)
+{
+    _timeOutMillis = timeOutMillis;
+}
+
+uint16_t 
+TwoWire::getTimeOut()
+{
+    return _timeOutMillis;
+}
+
+void 
+TwoWire::setClock(uint32_t frequency)
+{
+    i2c_clk = frequency;
+    volatile i2c_t *i2c_adapter = i2c[_i2c_num];
+    uint8_t speed_mode = I2C_CON_SPEED_STANDARD;
+
+    uint32_t v_i2c_freq = sysctl_clock_get_freq((sysctl_clock_t)(SYSCTL_CLOCK_I2C0 + _i2c_num));
+    uint16_t v_period_clk_cnt = floor( (v_i2c_freq*1.0 / i2c_clk / 2) + 0.5 );
+
+    if(v_period_clk_cnt <= 6)
+        v_period_clk_cnt = 6;
+    if(v_period_clk_cnt >= 65525)//65535-10
+        v_period_clk_cnt = 65525;
+    if((i2c_clk>100000) && (i2c_clk<=1000000))
+        speed_mode = I2C_CON_SPEED_FAST;
+    else
+        speed_mode = I2C_CON_SPEED_HIGH;
+    i2c_adapter->enable = 0;
+    i2c_adapter->con = I2C_CON_MASTER_MODE | I2C_CON_SLAVE_DISABLE | I2C_CON_RESTART_EN |
+                       (address_width == 10 ? I2C_CON_10BITADDR_SLAVE : 0) | I2C_CON_SPEED(speed_mode);
+    i2c_adapter->ss_scl_hcnt = I2C_SS_SCL_HCNT_COUNT(v_period_clk_cnt);
+    i2c_adapter->ss_scl_lcnt = I2C_SS_SCL_LCNT_COUNT(v_period_clk_cnt);
+    i2c_adapter->enable = I2C_ENABLE_ENABLE;
+
+}
+
+uint32_t 
+TwoWire::getClock()
+{
+    return i2c_clk;
+}
+
+int
+TwoWire::writeTransmission(uint16_t address, uint8_t* send_buf, size_t send_buf_len, bool sendStop)
+{
+    volatile i2c_t* i2c_adapter = i2c[_i2c_num];
+    size_t fifo_len, index;
+    //uint32_t abrt_source;
+
+    if(is_master_mode)
+        i2c_adapter->tar = I2C_TAR_ADDRESS(address);
+    while (send_buf_len)
+    {
+        fifo_len = 8 - i2c_adapter->txflr;
+        fifo_len = send_buf_len < fifo_len ? send_buf_len : fifo_len;
+        for (index = 0; index < fifo_len; index++)
+            i2c_adapter->data_cmd = I2C_DATA_CMD_DATA(*send_buf++);
+        if (i2c_adapter->tx_abrt_source != 0)
+        {
+            i2c_adapter->clr_tx_abrt;
+            usleep(10);
+            return 4;
+        }
+        send_buf_len -= fifo_len;
+    }
+    while ( (i2c_adapter->status & I2C_STATUS_ACTIVITY) ||
+            !(i2c_adapter->status & I2C_STATUS_TFE) )
+    {
+        if (i2c_adapter->tx_abrt_source != 0)
+        {
+            i2c_adapter->clr_tx_abrt;
+            usleep(10);
+            return 4;
+        }
+    }
+
+    return 0;
+}
+
+int
+TwoWire::readTransmission(uint16_t address, uint8_t* receive_buf, size_t receive_buf_len, bool sendStop)
+{ 
+    size_t fifo_len, index;
+    // size_t buf_len; 
+    size_t rx_len;
+    rx_len = receive_buf_len;
+    // buf_len = rx_len;
+    volatile i2c_t* i2c_adapter = i2c[_i2c_num];
+    uint32_t abrt_source;
+
+    if(is_master_mode)
+        i2c_adapter->tar = I2C_TAR_ADDRESS(address);
+
+    while (receive_buf_len || rx_len)
+    {
+        fifo_len = i2c_adapter->rxflr;
+        fifo_len = rx_len < fifo_len ? rx_len : fifo_len;
+        for (index = 0; index < fifo_len; index++)
+            *receive_buf++ = (uint8_t)i2c_adapter->data_cmd;
+        rx_len -= fifo_len;
+        fifo_len = 8 - i2c_adapter->txflr;
+        fifo_len = receive_buf_len < fifo_len ? receive_buf_len : fifo_len;
+        for (index = 0; index < fifo_len; index++)
+            i2c_adapter->data_cmd = I2C_DATA_CMD_CMD;
+        abrt_source = i2c_adapter->tx_abrt_source;
+        if (abrt_source != 0)
+        {
+            i2c_adapter->clr_tx_abrt;
+            usleep(10);
+            // if(receive_buf_len == buf_len)
+            
+            
+            return 4;
+            // retur_buf_len -= fifo_len;
+        }
+        receive_buf_len -= fifo_len;
+    }
+    
+    return 0;
+}
+
+void 
+TwoWire::beginTransmission(uint16_t address)
+{
+    transmitting = 1;
+    txAddress = address;
+}
+
+uint8_t 
+TwoWire::endTransmission(bool sendStop)  //结束时从rxbuff发送数据？
+{
+    int state = -1;
+    int index = 0;
+    uint8_t temp = 0;
+    size_t tx_data_length = i2c_tx_buff->available();
+    if(tx_data_length == 0){
+        state = readTransmission(txAddress, &temp, 1, sendStop);
+        return state;
+    }
+    uint8_t tx_data[RING_BUFFER_SIZE];
+    while(i2c_tx_buff->available())
+    {
+        tx_data[index++] = i2c_tx_buff->read_char();
+    }
+    state = writeTransmission(txAddress, tx_data, tx_data_length,sendStop);
+    return state;
+}
+
+uint8_t
+TwoWire::requestFrom(uint16_t address, uint8_t size, bool sendStop)  //请求数据，存入rxbuff，供read读
+{
+    int state,index = 0;
+    uint8_t rx_data[RING_BUFFER_SIZE];
+    state = readTransmission(address, rx_data, size, sendStop);
+    if(0 == state){
+        while(size)
+        {
+            i2c_rx_buff->store_char(rx_data[index++]); 
+            size--;
+        }
+    }
+    return state;
+}
+
+size_t 
+TwoWire::write(uint8_t data) //写到txbuff
+{
+    if(transmitting) {
+        i2c_tx_buff->store_char(data);
+    }
+    return 0;
+}
+
+size_t 
+TwoWire::write(const uint8_t *data, int quantity)
+{
+    for(size_t i = 0; i < quantity; ++i) {
+        if(!write(data[i])) {
+            return i;
+        }
+    }
+    return quantity;
+}
+
+int TwoWire::available(void)   //rxbuff.available
+{
+    return i2c_rx_buff->available();
+}
+
+int TwoWire::read(void)    //rxbuff.read
+{
+    return i2c_rx_buff->read_char();
+}
+
+int TwoWire::peek(void)    
+{ 
+    return i2c_rx_buff->peek();
+}
+
+int TwoWire::flush(void)
+{
+    i2c_rx_buff->clear();
+    i2c_tx_buff->clear();
+    return 0;
+}
+
+uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop)
+{
+    return requestFrom(static_cast<uint16_t>(address), static_cast<size_t>(quantity), static_cast<bool>(sendStop));
+}
+
+uint8_t TwoWire::requestFrom(uint16_t address, uint8_t quantity, uint8_t sendStop)
+{
+    return requestFrom(address, static_cast<size_t>(quantity), static_cast<bool>(sendStop));
+}
+
+uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity)
+{
+    return requestFrom(static_cast<uint16_t>(address), static_cast<size_t>(quantity), true);
+}
+
+uint8_t TwoWire::requestFrom(uint16_t address, uint8_t quantity)
+{
+    return requestFrom(address, static_cast<size_t>(quantity), true);
+}
+
+uint8_t TwoWire::requestFrom(int address, int quantity)
+{
+    return requestFrom(static_cast<uint16_t>(address), static_cast<size_t>(quantity), true);
+}
+
+uint8_t TwoWire::requestFrom(int address, int quantity, int sendStop)
+{
+    return static_cast<uint8_t>(requestFrom(static_cast<uint16_t>(address), static_cast<size_t>(quantity), static_cast<bool>(sendStop)));
+}
+
+void TwoWire::beginTransmission(int address)
+{
+    beginTransmission(static_cast<uint16_t>(address));
+}
+
+void TwoWire::beginTransmission(uint8_t address)
+{
+    beginTransmission(static_cast<uint16_t>(address));
+}
+
+uint8_t TwoWire::endTransmission(void)
+{
+    return endTransmission(true);
+}
+
+bool 
+TwoWire::busy(void){ 
+    return false;
+}
+
+void 
+TwoWire::onReceive( void (*handler)(int) )
+{
+    slave_recv_handler = handler;
+}
+void
+TwoWire::onRequest( void (*handler)(void) )
+{
+    slave_send_handler = handler;
+}
+
+void
+TwoWire::on_receive(uint8_t rec_data)
+{
+    if(slave_irq_event_start)
+    {
+        i2c_rx_buff->store_char(rec_data);
+        (*slave_recv_handler)((int)1);//此处跳到接收事件函数
+    }
+    return;
+}
+
+uint8_t
+TwoWire::on_transmit()
+{
+    if(slave_irq_event_start){
+        (*slave_send_handler)();//跳到发送事件函数
+        return i2c_tx_buff->read_char();
+    }
+    return 0;
+}
+
+uint8_t 
+TwoWire::on_event(i2c_event_t event)
+{
+    if(event == I2C_EV_START)
+        slave_irq_event_start = true ;
+    else
+        slave_irq_event_start = false;
+    return 0;
+}
+
+static int maix_i2c_slave_irq(void *userdata)
+{
+    auto &driver = *reinterpret_cast<TwoWire *>(userdata); 
+    volatile i2c_t *i2c_adapter = i2c[driver._i2c_num];
+    uint32_t status = i2c_adapter->intr_stat;
+    if (status & I2C_INTR_STAT_START_DET)
+    {
+        driver.on_event(I2C_EV_START);
+        readl(&i2c_adapter->clr_start_det);
+    }
+    if (status & I2C_INTR_STAT_RX_FULL)
+    {
+        driver.on_receive(i2c_adapter->data_cmd);
+    }
+    if (status & I2C_INTR_STAT_RD_REQ)
+    {
+        i2c_adapter->data_cmd = driver.on_transmit();
+        readl(&i2c_adapter->clr_rd_req);
+    }
+    if (status & I2C_INTR_STAT_STOP_DET)
+    {
+        driver.on_event(I2C_EV_STOP);
+        readl(&i2c_adapter->clr_stop_det);
+    }
+    return 0;
+}
+
+
+void
+TwoWire::scan(){
+    uint8_t temp;
+    for (int addr = 0x08; addr < 0x78; ++addr) {
+        // int ret = i2c_p->writeto(self, addr, NULL, 0, true);
+        // printf("find %x\n",addr);
+        int ret = readTransmission(addr,&temp, 1, 1);
+        // printf("ret:%x\n",ret);
+        if (ret == 0) {
+            Serial.print("SCAN Find device:");
+            Serial.println(addr,HEX);
+        }
+    }
+}
+
+TwoWire Wire = TwoWire(I2C_DEVICE_0);
+TwoWire Wire1 = TwoWire(I2C_DEVICE_1);
+TwoWire Wire2 = TwoWire(I2C_DEVICE_2);
\ No newline at end of file
diff --git a/libraries/Wire/src/Wire.h b/libraries/Wire/src/Wire.h
new file mode 100644
index 0000000..fc9fb06
--- /dev/null
+++ b/libraries/Wire/src/Wire.h
@@ -0,0 +1,126 @@
+#ifndef TwoWire_h
+#define TwoWire_h
+
+#include "Arduino.h"
+#include "Stream.h"
+#include "RingBuffer.h"
+
+#include "fpioa.h"
+#include "i2c.h"
+
+#define I2C_BUFFER_LENGTH 128
+
+#define I2C_CON_SPEED_STANDARD                        1 // <=100Kbit/s
+#define I2C_CON_SPEED_FAST                            2 // <=400Kbit/s or <=1000Kbit/s
+#define I2C_CON_SPEED_HIGH                            3 // <=3.4Mbit/s
+
+typedef void(*user_onRequest)(void);
+typedef void(*user_onReceive)(uint8_t*, int);
+
+class TwoWire : public Stream
+{
+public:
+    i2c_device_number_t _i2c_num;
+
+    TwoWire(i2c_device_number_t i2c_device);
+    ~TwoWire();
+    void begin(uint8_t sda = SDA, uint8_t scl = SCL, uint32_t frequency = 500000);
+    void begin(uint16_t slave_address, uint8_t sda = SDA, uint8_t scl = SCL);
+
+    void setClock(uint32_t frequency); 
+    uint32_t getClock();
+
+    void setTimeOut(uint16_t timeOutMillis);
+    uint16_t getTimeOut();
+
+    int writeTransmission(uint16_t address, uint8_t* send_buf, size_t send_buf_len, bool sendStop);
+    int readTransmission(uint16_t address, uint8_t* receive_buf, size_t receive_buf_len, bool sendStop);
+
+    void beginTransmission(uint16_t address);
+    void beginTransmission(uint8_t  address);
+    void beginTransmission(int      address);
+
+    uint8_t endTransmission(bool sendStop);
+    uint8_t endTransmission(void);
+
+    uint8_t requestFrom(uint16_t address, uint8_t size, bool sendStop);
+    uint8_t requestFrom(uint16_t address, uint8_t size, uint8_t sendStop);
+    uint8_t requestFrom(uint16_t address, uint8_t size);
+    uint8_t requestFrom(uint8_t address, uint8_t size, uint8_t sendStop);
+    uint8_t requestFrom(uint8_t address, uint8_t size);
+    uint8_t requestFrom(int address, int size, int sendStop);
+    uint8_t requestFrom(int address, int size);
+
+    size_t write(uint8_t);
+    size_t write(const uint8_t *, int);
+    int available(void);
+    int read(void);
+    int peek(void);
+    int flush(void);
+
+    inline int write(const char * s)
+    {
+        return write((uint8_t*) s, strlen(s));
+    }
+    inline int write(unsigned long n)
+    {
+        return write((uint8_t)n);
+    }
+    inline int write(long n)
+    {
+        return write((uint8_t)n);
+    }
+    inline int write(unsigned int n)
+    {
+        return write((uint8_t)n);
+    }
+    inline int write(int n)
+    {
+        return write((uint8_t)n);
+    }
+
+    void onReceive( void (*)(int) );
+    void onRequest( void (*)(void) );
+
+    uint8_t on_event(i2c_event_t event);
+    uint8_t on_transmit();
+    void on_receive(uint8_t rec_data);
+
+    bool busy();
+
+    void scan();
+
+private:
+    uint16_t i2c_slave_address;
+    bool is_master_mode = false;
+    uint32_t address_width = 7;
+    uint8_t sda = FPIOA_NUM_IO;
+    uint8_t scl = FPIOA_NUM_IO;
+    uint32_t i2c_clk;
+    fpioa_function_t sda_func;
+    fpioa_function_t scl_func;
+
+    RingBuffer *i2c_tx_buff;
+    RingBuffer *i2c_rx_buff;
+
+    uint16_t txAddress;
+    uint8_t transmitting;
+
+    uint16_t _timeOutMillis;
+
+    bool slave_irq_event_start = false;
+
+    void (*slave_recv_handler)(int) ;
+    void (*slave_send_handler)(void) ;
+
+};
+
+
+
+extern volatile i2c_t* const i2c[3];
+
+extern TwoWire Wire;
+extern TwoWire Wire1;
+extern TwoWire Wire2;
+
+#endif //TwoWire_h
\ No newline at end of file
diff --git a/variants/standard/sipeed_go.h b/variants/standard/sipeed_go.h
index 682ec42..23f8775 100644
--- a/variants/standard/sipeed_go.h
+++ b/variants/standard/sipeed_go.h
@@ -62,8 +62,8 @@ extern class UARTClass Serial3;
 #define RX1                   6
 #define TX1                   7
 
-#define SDA                  10
-#define SCL                   9
+#define SDA                  31
+#define SCL                  30
 
 static const uint8_t SS   = SPI0_CS0 ;
 static const uint8_t MOSI = SPI0_MOSI;
diff --git a/variants/standard/sipeedm1.h b/variants/standard/sipeedm1.h
index 9ef0495..867788a 100644
--- a/variants/standard/sipeedm1.h
+++ b/variants/standard/sipeedm1.h
@@ -62,8 +62,8 @@ extern class UARTClass Serial3;
 #define RX1                   6
 #define TX1                   7
 
-#define SDA                  10
-#define SCL                   9
+#define SDA                  31
+#define SCL                  30
 
 static const uint8_t SS   = SPI0_CS0 ;
 static const uint8_t MOSI = SPI0_MOSI;