stm32对at24c04的读写
时间: 2023-08-03 21:09:48 浏览: 60
以下是基于STM32的I2C接口与AT24C04进行读写操作的示例代码:
```c
#include "stm32f10x.h"
#include "stm32f10x_i2c.h"
#define I2C1_OWN_ADDRESS7 0xA0
#define I2C_SPEED 100000 // I2C速度为100kHz
#define I2C_TIMEOUT 0x1000 // I2C超时时间为1s
#define I2C1_SCL_GPIO_PORT GPIOB
#define I2C1_SCL_GPIO_PIN GPIO_Pin_6
#define I2C1_SDA_GPIO_PORT GPIOB
#define I2C1_SDA_GPIO_PIN GPIO_Pin_7
void I2C1_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
GPIO_InitStructure.GPIO_Pin = I2C1_SCL_GPIO_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(I2C1_SCL_GPIO_PORT, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = I2C1_SDA_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(I2C1_SDA_GPIO_PORT, &GPIO_InitStructure);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = I2C1_OWN_ADDRESS7;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;
I2C_Init(I2C1, &I2C_InitStructure);
I2C_Cmd(I2C1, ENABLE);
}
int I2C1_Write(uint8_t deviceAddress, uint8_t registerAddress, uint8_t data)
{
int status = 0;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, deviceAddress, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_SendData(I2C1, registerAddress);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_SendData(I2C1, data);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_GenerateSTOP(I2C1, ENABLE);
return status;
}
int I2C1_Read(uint8_t deviceAddress, uint8_t registerAddress, uint8_t* data)
{
int status = 0;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, deviceAddress, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_SendData(I2C1, registerAddress);
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, deviceAddress, 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);
return status;
}
int main(void)
{
uint8_t data = 0;
I2C1_Configuration();
// 读取AT24C04的0x01地址中的数据
I2C1_Read(0xA0, 0x01, &data);
// 向AT24C04的0x01地址中写入数据0x55
I2C1_Write(0xA0, 0x01, 0x55);
while(1);
}
```
注意:以上代码仅供参考,具体实现方式需要根据实际情况进行调整。