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. /* Enable peripheral clocks --------------------------------------------------*/
5. /* GPIOB Periph clock enable */
6. //RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);
7. //启动GPIO模块时钟
8. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
9. //把雕饰设置普通IO口
10. GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable,ENABLE);
11. /* I2C1 Periph clock enable */
12. RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

二、I2C_初始化

1. /* Configure I2C1 pins: SCL and SDA */
2. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
3. GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
4. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
5. GPIO_Init(GPIOB, &GPIO_InitStructure);
6. I2C_InitTypeDef I2C_InitStructure;
7. /* I2C configuration */
8. I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
9. I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
10. I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;
11. I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
12. I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
13. I2C_InitStructure.I2C_ClockSpeed = 100000;
14. /* I2C Peripheral Enable */
15. I2C_Cmd(I2C1, ENABLE);
16. /* Apply I2C configuration after enabling it */
17. 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. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
6. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
7. GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
8. GPIO_Init(GPIOA, &GPIO_InitStructure);
9. USART_InitStructure.USART_BaudRate = 115200;
10. USART_InitStructure.USART_WordLength = USART_WordLength_8b;
11. USART_InitStructure.USART_StopBits = USART_StopBits_1;
12. USART_InitStructure.USART_Parity = USART_Parity_No;
13. USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
14. USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
15. USART_Init(USART1, &USART_InitStructure);
16. USART_Cmd(USART1, ENABLE);

四、main函数测试程序

1. while (1)
2. {
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。