硬件IIC测试成功！

只看该作者 · 2014-2-10 20:18

寻觅了好多代码，终于找到一个成功的。与大家分享下：
**********************************************************************/
/*IIC配置                                           */
/*

   */
/**********************************************************************/
void Iic_Init()
{
GPIO_InitTypeDef GPIO_InitStructure;

I2C_InitTypeDef I2C_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
/* Configure IO connected to IIC*********************/
GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);

I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0xa0;  //这里是eeprom地址
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 200000;

I2C_Cmd(I2C2, ENABLE);

I2C_Init(I2C2, &I2C_InitStructure);
}
/**********************************************************************/
/*IIC写一个字节                                           */
/* id：eeprom地址 write_address：要写入的地址    byte：写入的数据

   */
/**********************************************************************/
void I2C_WriteByte(unsigned char id,unsigned char write_address,unsigned char byte)
{
I2C_GenerateSTART(I2C2,ENABLE);
//产生起始条件
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));
//等待ACK
I2C_Send7bitAddress(I2C2,id,I2C_Direction_Transmitter);
//向设备发送设备地址
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
//等待ACK
I2C_SendData(I2C2, write_address);
//寄存器地址
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
//等待ACK
I2C_SendData(I2C2, byte);
//发送数据
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
//发送完成
I2C_GenerateSTOP(I2C2, ENABLE);
//产生结束信号
}
/**********************************************************************/
/*IIC读数据                                                 */
/*

   */
/**********************************************************************/
unsigned char I2C_ReadByte(unsigned char  id, unsigned char read_address)
{
unsigned char temp;

while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));
    //等待I2C
    I2C_GenerateSTART(I2C2, ENABLE);
    //产生起始信号
    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));
//EV5
    I2C_Send7bitAddress(I2C2, id, I2C_Direction_Transmitter);
//发送地址
    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
    //EV6
    I2C_Cmd(I2C2, ENABLE);
//重新设置可以清楚EV6
    I2C_SendData(I2C2, read_address);
//发送读得地址
    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
    //EV8
    I2C_GenerateSTART(I2C2, ENABLE);
//重新发送
    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));
    //EV5
    I2C_Send7bitAddress(I2C2, id, I2C_Direction_Receiver);
    //发送读地址
    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
    //EV6
I2C_AcknowledgeConfig(I2C2, DISABLE);
I2C_GenerateSTOP(I2C2, ENABLE);
//关闭应答和停止条件产生
while(!(I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED)));

temp = I2C_ReceiveData(I2C2);

    I2C_AcknowledgeConfig(I2C2, ENABLE);

return temp;
}