STM32：ADC采集数据实例(采用DMA模式)

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;