关于STM32F103ZE的I2C问题咨询

xieyahua 提问时间：2014-6-29 14:04 /

刚接触STM32处理器。在调试STM32F103ZE的I2C时，遇到了问题，请教一下各位高手。
我使用的是的I2C2，初始化程序如下：
void I2C2_Configuration(void)
{
I2C_InitTypeDef I2C_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

/* Configure I2C2 pins: SCL-PB10 and SDA-PB11 */
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);

NVIC_InitStructure.NVIC_IRQChannel = BSP_INT_ID_I2C2_EV; //中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //强占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;//次优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能
NVIC_Init(&NVIC_InitStructure);//初始化中断

NVIC_InitStructure.NVIC_IRQChannel = BSP_INT_ID_I2C2_ER; //中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //强占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;//次优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能
NVIC_Init(&NVIC_InitStructure);//初始化中断

I2C_DeInit(I2C2);

I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x65;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 100000;

I2C_Cmd(I2C2,ENABLE);//打开模块功能

I2C_Init(I2C2,&I2C_InitStructure);

I2C_ITConfig(I2C2,I2C_IT_BUF | I2C_IT_EVT | I2C_IT_ERR,ENABLE);
}
通过示波器观察SCL和SDA的波形，CPU复位后，SCL和SDA都保持高电平，一旦我运行I2C_GenerateSTART(I2C2,ENABLE)后，SDA变成了低电平，并且一直保持低电平，SCL一直为高，但就是不进入I2C事件中断(应当起始条件发送后，SB置，产生中断)。等再次复位CPU后，SCL和SDA又都为高电平。
运行I2C_GenerateSTART(I2C2,ENABLE)后，各寄存器值如下：
I2C2->CR1=0x0501
I2C2->CR2=0x0724
I2C2->SR1=0x0000
I2C2->SR2=0x0002

不知道大家有没有遇到跟我类似的问题，请帮忙看一下问题出在哪里。