I2C_24c02实验

一、RCC初始化

 /* Setup the microcontroller system. Initialize the Embedded Flash Interface,
      initialize the PLL and update the SystemFrequency variable. */
   SystemInit();

 /* Enable peripheral clocks --------------------------------------------------*/
   /* GPIOB Periph clock enable */
   //RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

     //启动GPIO模块时钟
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
     //把雕饰设置普通IO口
     GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable,ENABLE);

   /* I2C1 Periph clock enable */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

二、I2C_初始化

 /* Configure I2C1 pins: SCL and SDA */
   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_InitTypeDef I2C_InitStructure;

   /* I2C configuration */
   I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
   I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
   I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;
   I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
   I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
   I2C_InitStructure.I2C_ClockSpeed = 100000;

   /* I2C Peripheral Enable */
   I2C_Cmd(I2C1, ENABLE);
   /* Apply I2C configuration after enabling it */
   I2C_Init(I2C1, &I2C_InitStructure);

三、USART初始化

     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_Init(GPIOA, &GPIO_InitStructure);

     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_Init(GPIOA, &GPIO_InitStructure);

     USART_InitStructure.USART_BaudRate = 115200;
     USART_InitStructure.USART_WordLength = USART_WordLength_8b;
     USART_InitStructure.USART_StopBits = USART_StopBits_1;
     USART_InitStructure.USART_Parity = USART_Parity_No;
     USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
     USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
     USART_Init(USART1, &USART_InitStructure);
     USART_Cmd(USART1, ENABLE);

四、main函数测试程序

 while (1)
 {
     I2C_EE_BufferWrite(ReadBuff, 0, 3);
     I2C_EE_BufferRead(SendBuff, 0, 3);
     Delay(0xfffff);
     fPutString(SendBuff, 15);
 }

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。

转载于:https://www.cnblogs.com/ch122633/p/7363268.html