I2C_24c02实验

一、RCC初始化

1. /* Setup the microcontroller system. Initialize the Embedded Flash Interface,
   
2.      initialize the PLL and update the SystemFrequency variable. */
   
3.   SystemInit();
   
4. 
   
5. /* Enable peripheral clocks --------------------------------------------------*/
   
6.   /* GPIOB Periph clock enable */
   
7.   //RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
   
8. 
   
9.     //启动GPIO模块时钟
   
10.     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
    
11.     //把雕饰设置普通IO口
    
12.     GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable,ENABLE);
    
13. 
    
14.   /* I2C1 Periph clock enable */
    
15.   RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

二、I2C_初始化

1. 
   
2. /* Configure I2C1 pins: SCL and SDA */
   
3.   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
   
4.   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   
5.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
   
6.   GPIO_Init(GPIOB, &GPIO_InitStructure);
   
7. 
   
8.   I2C_InitTypeDef I2C_InitStructure;
   
9. 
   
10.   /* I2C configuration */
    
11.   I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    
12.   I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    
13.   I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;
    
14.   I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    
15.   I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    
16.   I2C_InitStructure.I2C_ClockSpeed = 100000;
    
17.   
    
18.   /* I2C Peripheral Enable */
    
19.   I2C_Cmd(I2C1, ENABLE);
    
20.   /* Apply I2C configuration after enabling it */
    
21.   I2C_Init(I2C1, &I2C_InitStructure);

三、USART初始化

1.     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
   
2.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   
3.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   
4.     GPIO_Init(GPIOA, &GPIO_InitStructure);
   
5.     
   
6.     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
   
7.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
   
8.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   
9.     GPIO_Init(GPIOA, &GPIO_InitStructure);
   
10. 
    
11.     USART_InitStructure.USART_BaudRate = 115200;
    
12.     USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    
13.     USART_InitStructure.USART_StopBits = USART_StopBits_1;
    
14.     USART_InitStructure.USART_Parity = USART_Parity_No;
    
15.     USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    
16.     USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    
17.     USART_Init(USART1, &USART_InitStructure);
    
18.     USART_Cmd(USART1, ENABLE);

四、main函数测试程序

1. while (1)
   
2. {    
3.     I2C_EE_BufferWrite(ReadBuff, 0, 3);
4.     I2C_EE_BufferRead(SendBuff, 0, 3);
   
5.     Delay(0xfffff);
   
6.     fPutString(SendBuff, 15);
7. }

遇到的问题，我用以前的RCC初始化程序怎么都无法启动I2C。一直在  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));  中跑。
现在还没有搞清楚，I2C需要怎么设置时钟。