SOC：STM32F103RCT6
软件平台：STM官方库V3.5.0
开发工具：Keil
本文章将给出STM32F103RCT6控制AT24C02的代码。如有疑问和错误，欢迎留言告之。
AT24C02使用I2C进行数据访问，板子上使用STM32的I2C控制器2和AT24C02进行连接。
具体来说，PB10作为SCL和AT24C02相连，PB11作为SDL和AT24C02相连。
这里就不给出硬件连接图了，比较简单。
I2C这里使用轮询方法，不是中断，请留意。
首先，给出I2C控制器的初始化代码，和读写代码，一共三个函数，对应三个功能。
注意：这里是使用I2C控制器2。
#include"stm32f10x.h"
#include"stm32f10x_i2c.h"
#include
voidI2C2_Init(I2C_InitTypeDef*I2C_InitStruct)
{
GPIO_InitTypeDefGPIO_InitStruct;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
/*配置IO管脚*/
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_10|GPIO_Pin_11;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_2MHz;
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF_OD;
GPIO_Init(GPIOB,&GPIO_InitStruct);
I2C_Init(I2C2,I2C_InitStruct);
I2C_Cmd(I2C2,ENABLE);
//配置NVIC
/*NVIC_InitStructure.NVIC_IRQChannel=I2C2_EV_IRQn;//I2C事件中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;//抢占优先级1
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x02;//子优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;//使能中断通道
NVIC_Init(&NVIC_InitStructure);//根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器*/
//I2C_ITConfig(I2C2,I2C_IT_EVT,ENABLE);//打开事件中断
}
/*i2c写一个字节*/
/*ByteWrite*/
voidI2C2_WriteByte(uint8_tDeviceAddress,uint8_tMemoryAddress,uint8_tData)
{
while(I2C_GetFlagStatus(I2C2,I2C_FLAG_BUSY));//等待I2C空闲
//start
I2C_GenerateSTART(I2C2,ENABLE);
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_MODE_SELECT)!=SUCCESS);
//deviceaddress
I2C_Send7bitAddress(I2C2,DeviceAddress,I2C_Direction_Transmitter);//写模式
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)!=SUCCESS);
//printf("addressoverrn");
//memoryaddress
I2C_SendData(I2C2,MemoryAddress);
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_BYTE_TRANSMITTED)!=SUCCESS);
//data
I2C_SendData(I2C2,Data);
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_BYTE_TRANSMITTED)!=SUCCESS);
//stop
I2C_GenerateSTOP(I2C2,ENABLE);
}
/*i2c读一个字节*/
/*RandomRead*/
uint8_tI2C2_ReadByte(uint8_tDeviceAddress,uint8_tMemoryAddress)
{
uint8_tData;
while(I2C_GetFlagStatus(I2C2,I2C_FLAG_BUSY));//等待I2C空闲
//start
I2C_GenerateSTART(I2C2,ENABLE);
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_MODE_SELECT)!=SUCCESS);//ev5
//deviceaddress
I2C_Send7bitAddress(I2C2,DeviceAddress,I2C_Direction_Transmitter);//写模式
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)!=SUCCESS);//ev6
//memoryaddress
I2C_SendData(I2C2,MemoryAddress);
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_BYTE_TRANSMITTED)!=SUCCESS);
//start
I2C_GenerateSTART(I2C2,ENABLE);
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_MODE_SELECT)!=SUCCESS);
//deviceaddress
I2C_Send7bitAddress(I2C2,DeviceAddress,I2C_Direction_Receiver);//读模式
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)!=SUCCESS);
/*按照manual的图273，先读取数据，关闭ACK应答，最后发出STOP*/
while(I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_BYTE_RECEIVED)!=SUCCESS);/*等待读取事件，再读取数据*/
Data=I2C_ReceiveData(I2C2);
I2C_AcknowledgeConfig(I2C2,DISABLE);//关闭应答和停止条件产生
printf("receivedrn");
I2C_GenerateSTOP(I2C2,ENABLE);
I2C_AcknowledgeConfig(I2C2,ENABLE);
returnData;
}
接着给出相应的AT24C02访问代码
#include"stm32f10x.h"
#include"stm32f10x_i2c.h"
#include"i2c.h"
#include"delay.h"
#include
/*从AT24CXX的指定地址开始读出一个字节*/
uint8_tAT24CXX_ReadByte(uint8_tReadAddr)
{
returnI2C2_ReadByte(0xA0,ReadAddr);
}
/*向AT24CXX的指定地址开始写入一个字节*/
voidAT24CXX_WriteByte(uint8_tWriteAddr,uint8_tData)
{
I2C2_WriteByte(0xA0,WriteAddr,Data);
}
voidAT24CXX_test(void)
{
uint8_ti;
I2C_InitTypeDefI2C_InitStructure;
I2C_InitStructure.I2C_ClockSpeed=200000;//200kHZ
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
