#include "i2c.h"
void I2C_Init_(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	I2C_InitTypeDef I2C_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);//GPIOB
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	
	I2C_DeInit(I2C1);
	I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
	I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
	I2C_InitStructure.I2C_OwnAddress1 = 0;     //I2C_OAR1
	I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
	I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
	I2C_InitStructure.I2C_ClockSpeed = 400000;    //400KHz
	I2C_Init(I2C1, &I2C_InitStructure);
	I2C_Cmd(I2C1, ENABLE);
}