stm32f103c8t6 硬件iic驱动及at24c02读写

1. 硬件I2C驱动

STM32F103C8T6支持硬件I2C通信，需要使用I2C外设，具体步骤如下：

1.1 初始化GPIO

首先需要根据芯片手册设置I2C引脚的模式和速率。以下是一个示例：

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
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);

1.2 初始化I2C

接下来，需要设置I2C参数和初始化I2C外设。以下是一个示例：

RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
I2C_InitTypeDef I2C_InitStructure;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 100000; // 100 kHz
I2C_Init(I2C1, &I2C_InitStructure);
I2C_Cmd(I2C1, ENABLE);

1.3 发送数据

使用以下函数发送数据：

I2C_GenerateSTART(I2C1, ENABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, address, I2C_Direction_Transmitter);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_SendData(I2C1, data);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_GenerateSTOP(I2C1, ENABLE);

1.4 接收数据

使用以下函数接收数据：

I2C_AcknowledgeConfig(I2C1, ENABLE);
I2C_GenerateSTART(I2C1, ENABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, address, I2C_Direction_Receiver);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
data = I2C_ReceiveData(I2C1);
I2C_AcknowledgeConfig(I2C1, DISABLE);
I2C_GenerateSTOP(I2C1, ENABLE);

2. AT24C02读写

AT24C02是一种串行EEPROM存储器，采用I2C接口进行通信。以下是一个示例，演示如何使用STM32F103C8T6与AT24C02通信。

2.1 初始化AT24C02

AT24C02有一个7位地址，用于选择设备。以下是一个示例，演示如何将AT24C02初始化为地址0x50：

#define AT24C02_ADDRESS 0x50

2.2 写入数据

以下是一个示例，演示如何向AT24C02写入数据：

uint8_t data[] = {0x01, 0x02, 0x03, 0x04};
uint8_t address = 0x00;
for (int i = 0; i < sizeof(data); i++) {
    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
    I2C_Send7bitAddress(I2C1, AT24C02_ADDRESS, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
    I2C_SendData(I2C1, address++);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
    I2C_SendData(I2C1, data[i]);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
    I2C_GenerateSTOP(I2C1, ENABLE);
    delay(5);
}

2.3 读取数据

以下是一个示例，演示如何从AT24C02读取数据：

uint8_t data[4];
uint8_t address = 0x00;
for (int i = 0; i < sizeof(data); i++) {
    I2C_AcknowledgeConfig(I2C1, ENABLE);
    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
    I2C_Send7bitAddress(I2C1, AT24C02_ADDRESS, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
    I2C_SendData(I2C1, address++);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
    I2C_Send7bitAddress(I2C1, AT24C02_ADDRESS, I2C_Direction_Receiver);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
    data[i] = I2C_ReceiveData(I2C1);
    I2C_GenerateSTOP(I2C1, ENABLE);
    delay(5);
}