RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/* I2C2 Periph clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
/* Configure I2C2 pins: SCL and SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_Cmd(I2C2, ENABLE);
/* Apply I2C configuration after enabling it */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0xA0;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 400000; /* 100000也不行，PCLK1为18000000Hz */
I2C_Init(I2C2, &I2C_InitStructure);
这里设置断点，SR2的bit1为“1”
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