CH32V103的硬件IIC连续读写AT24系列EEPROM

只看该作者 · 2024-3-7 16:53

看到网上没有CH32V系列的关于硬件IIC连续读写AT24系列EEPROM的文章。我在借鉴了网上一些资料后在官方例程基础上做了修改，由于AT24系列EEPROM的写Page是有长度限制的，低容量的是8bytes，高容量的是16/32bytes。所以在写之前先要做地址对齐，先将不对齐的部分写入，然后连续按照页大小写入，最后收尾即可。

要注意的是每次写入之间要加延时，经测试要大于2ms为妙，测试过1ms延时会卡死。

代码如下：

复制

/*

 *@Note

 I2C接口操作EEPROM外设例程： 此代码在官方例程基础上修改，其中部分代码借鉴了stm32等其他类型单片机的IIC流程

 I2C1_SCL(PB10)、I2C1_SDA(PB11)。

 本例程使用 EEPROM 为 AT24Cxx系列。

 操作步骤：

 READ EEPROM：Start + 0xA0 + 8bit Data Address + Start + 0xA1 + Read Data + Stop.

 WRITE EERPOM：Start + 0xA0 + 8bit Data Address + Write Data + Stop.

*/

 

#include "debug.h"

 

/**********************************************************************

*@Note:

AT24Cxx：

READ EEPROM：Start + 0xA0 + 8bit Data Address + Start + 0xA1 + Read Data + Stop.

WRITE EERPOM：Start + 0xA0 + 8bit Data Address + Write Data + Stop.

*******************************************************************************/

/* EERPOM DATA ADDRESS Length Definition */

#define Address_8bit     0

#define Address_16bit    1

 

/* EERPOM DATA ADDRESS Length Selection */

#define Address_Lenth    Address_8bit

//#define Address_Lenth   Address_16bit

 

/* Global define */

#define SIZE             sizeof(TEXT_Buffer)

//写入和读取的初始地址

#define WR_Address       2

//器件的页大小

#define PAGE_SIZE        16

/* Global Variable */

const u8 TEXT_Buffer[] = {"CH32V103 IIC TEST GOOD LUCK!\r Let's Go!\r AT24C02 Page=8,AT24C4/8/16 Page=16,AT24C32/64 Page=32."};

 

/*********************************************************************

 * @fn      IIC_Init

 *

 * [url=home.php?mod=space&uid=247401]@brief[/url]   Initializes the IIC peripheral.

 *

 * [url=home.php?mod=space&uid=266161]@return[/url]  none

 */

void IIC_Init(u32 bound, u16 address)

{

    GPIO_InitTypeDef GPIO_InitStructure = {0};

    I2C_InitTypeDef  I2C_InitTSturcture = {0};

 

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);

 

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOB, &GPIO_InitStructure);

 

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOB, &GPIO_InitStructure);

 

    I2C_InitTSturcture.I2C_ClockSpeed = bound;

    I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;

    I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_2;

    I2C_InitTSturcture.I2C_OwnAddress1 = address;

    I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;

    I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

    I2C_Init(I2C2, &I2C_InitTSturcture);

 

    I2C_Cmd(I2C2, ENABLE);

 

    I2C_AcknowledgeConfig(I2C2, ENABLE);

}

 

/*********************************************************************

 * @fn      AT24CXX_Init

 *

 * @brief   Initializes AT24xx EEPROM.

 *

 * @return  none

 */

void AT24CXX_Init(void)

{

    IIC_Init(100000, 0xA0);

}

 

/*********************************************************************

 * @fn      AT24CXX_ReadOneByte

 *

 * @brief   Read one data from EEPROM.

 *

 * @param   ReadAddr - Read frist address.

 *

 * @return  temp - Read data.

 */

u8 AT24CXX_ReadOneByte(u16 ReadAddr)

{

    u8 temp = 0;

 

    while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY) != RESET);

    I2C_GenerateSTART(I2C2, ENABLE);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C2, 0XA0, I2C_Direction_Transmitter);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

 

#if(Address_Lenth == Address_8bit)

    I2C_SendData(I2C2, (u8)(ReadAddr & 0x00FF));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

#elif(Address_Lenth == Address_16bit)

    I2C_SendData(I2C2, (u8)(ReadAddr >> 8));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

    I2C_SendData(I2C2, (u8)(ReadAddr & 0x00FF));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

#endif

 

    I2C_GenerateSTART(I2C2, ENABLE);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C2, 0XA0, I2C_Direction_Receiver);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

    while(I2C_GetFlagStatus(I2C2, I2C_FLAG_RXNE) == RESET)

        I2C_AcknowledgeConfig(I2C2, DISABLE);

 

    temp = I2C_ReceiveData(I2C2);

    I2C_GenerateSTOP(I2C2, ENABLE);

 

    return temp;

}

 

 

 

/*********************************************************************

 * @fn      AT24CXX_MulitReadByte

 *

 * @brief   Read one data from EEPROM.

 *

 * @param   ReadAddr - Read frist address.

 *          Readbuffer - Read data buffer.

 *          Num - Size will be read.

 *

 * @return  read_count

 */

u8 AT24CXX_MulitReadBytes(u16 ReadAddr,u8 *Readbuffer, u8 Num )

{

    u8 read_count=0;

    while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY) != RESET);

    I2C_GenerateSTART(I2C2, ENABLE);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C2, 0XA0, I2C_Direction_Transmitter);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

 

#if(Address_Lenth == Address_8bit)

    I2C_SendData(I2C2, (u8)(ReadAddr & 0x00FF));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

#elif(Address_Lenth == Address_16bit)

    I2C_SendData(I2C2, (u8)(ReadAddr >> 8));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

    I2C_SendData(I2C2, (u8)(ReadAddr & 0x00FF));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

#endif

 

    I2C_GenerateSTART(I2C2, ENABLE);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C2, 0XA0, I2C_Direction_Receiver);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

 

    while(Num--)

       {

 

        if(Num==0) //最后一个数据产生停止应答信号

        {

         //应答必须关闭，否则下次IIC将不能用

         I2C_AcknowledgeConfig(I2C2, DISABLE);  //需要在接受到最后一位数据前关闭应答

         }

        while(I2C_GetFlagStatus(I2C2, I2C_FLAG_RXNE) == RESET);       //等待收到数据

         *Readbuffer++=I2C_ReceiveData(I2C2);  //收到数据放入缓存

         read_count++;

      }

       I2C_GenerateSTOP(I2C2, ENABLE);          //发送停止信号

       I2C_AcknowledgeConfig(I2C1,ENABLE) ;     //开启应答方便下一次使用

 

       return read_count;

}

 

 

 

/*********************************************************************

 * @fn      AT24CXX_WriteOneByte

 *

 * @brief   Write one data to EEPROM.

 *

 * @param   WriteAddr - Write frist address.

 *

 * @return  DataToWrite - Write data.

 */

void AT24CXX_WriteOneByte(u16 WriteAddr, u8 DataToWrite)

{

    while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY) != RESET);

    I2C_GenerateSTART(I2C2, ENABLE);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C2, 0XA0, I2C_Direction_Transmitter);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

 

#if(Address_Lenth == Address_8bit)

    I2C_SendData(I2C2, (u8)(WriteAddr & 0x00FF));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

#elif(Address_Lenth == Address_16bit)

    I2C_SendData(I2C2, (u8)(WriteAddr >> 8));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

    I2C_SendData(I2C2, (u8)(WriteAddr & 0x00FF));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

#endif

 

    if(I2C_GetFlagStatus(I2C2, I2C_FLAG_TXE) != RESET)

    {

        I2C_SendData(I2C2, DataToWrite);

    }

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) ;

    I2C_GenerateSTOP(I2C2, ENABLE);

}

 

/*********************************************************************

 * @fn      AT24CXX_WritePage

 *

 * @brief   Write one data to EEPROM.

 *

 * @param   WriteAddr - Write frist address.

 *          WriteBuffer - data will be write

 *          Num - data num 1~8,page is 8 byte

 *

 * @return  DataToWrite - Write data.

 */

void AT24CXX_WritePage(u16 WriteAddr, u8 *WriteBuffer, u8 Num)

{

    while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY) != RESET);

    I2C_GenerateSTART(I2C2, ENABLE);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2C2, 0XA0, I2C_Direction_Transmitter);

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

 

#if(Address_Lenth == Address_8bit)

    I2C_SendData(I2C2, (u8)(WriteAddr & 0x00FF));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

#elif(Address_Lenth == Address_16bit)

    I2C_SendData(I2C2, (u8)(WriteAddr >> 8));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

    I2C_SendData(I2C2, (u8)(WriteAddr & 0x00FF));

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

 

#endif

 

    while(!(I2C_GetFlagStatus(I2C2,I2C_FLAG_TXE)));

    I2C_SendData(I2C2, *WriteBuffer++);

    while(!(I2C_GetFlagStatus(I2C2,I2C_FLAG_TXE)));

    while(Num)

    {

        Num--;

        if(Num==0)  break;  //全部发送完毕，直接退出

        //还有数据则继续发送

        I2C_SendData(I2C2, *WriteBuffer++);

        while(!(I2C_GetFlagStatus(I2C2,I2C_FLAG_TXE))); //等待数据发送完毕

    }

 

    while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) ;

    I2C_GenerateSTOP(I2C2, ENABLE);

}

 

 

/*********************************************************************

 * @fn      AT24CXX_Read

 *

 * @brief   Read multiple data from EEPROM.

 *

 * @param   ReadAddr - Read frist address. (AT24c02: 0~255)

 *          pBuffer - Read data.

 *          NumToRead - Data number.

 *

 * @return  none

 */

void AT24CXX_Read(u16 ReadAddr, u8 *pBuffer, u16 NumToRead)

{

    while(NumToRead)

    {

        *pBuffer++ = AT24CXX_ReadOneByte(ReadAddr++);

        NumToRead--;

    }

}

 

/*********************************************************************

 * @fn      AT24CXX_Write

 *

 * @brief   Write multiple data to EEPROM.

 *

 * @param   WriteAddr - Write frist address. (AT24c02: 0~255)

 *          pBuffer - Write data.

 *          NumToWrite - Data number.

 *

 * @return  none

 */

void AT24CXX_Write(u16 WriteAddr, u8 *pBuffer, u16 NumToWrite)

{

    while(NumToWrite--)

    {

        AT24CXX_WriteOneByte(WriteAddr, *pBuffer);

        WriteAddr++;

        pBuffer++;

        Delay_Ms(2);

    }

}

 

 

void AT24CXX_MulitWriteBytes(u16 WriteAddr, u8 *pBuffer, u16 NumToWrite)

{

    BOOL last_time = 0;

    u8 duiqi_count = 0;

    //首先要对齐到页

    if(WriteAddr%PAGE_SIZE !=0 ){

        duiqi_count = ((u8)(WriteAddr/PAGE_SIZE )+1)*PAGE_SIZE -WriteAddr;

        printf("duiqi_count:%d\r\n", duiqi_count);

        AT24CXX_WritePage(WriteAddr, pBuffer,duiqi_count);

        NumToWrite = NumToWrite - duiqi_count;

        WriteAddr = WriteAddr + duiqi_count;

        pBuffer = pBuffer + duiqi_count;

        Delay_Ms(3);

    }

    //将剩余数据写入

    while(!last_time)

        {

            if(NumToWrite <= PAGE_SIZE ) //如果小于页大小，为最后 一次写入

            {

                AT24CXX_WritePage(WriteAddr, pBuffer,NumToWrite);

                last_time = 1;

            }

            else { //连续页写入

                AT24CXX_WritePage(WriteAddr, pBuffer,PAGE_SIZE);

                WriteAddr = WriteAddr + PAGE_SIZE;

                pBuffer = pBuffer + PAGE_SIZE;

                NumToWrite = NumToWrite -PAGE_SIZE;

            }

            Delay_Ms(3);

        }

}

 

/*********************************************************************

 * @fn      main

 *

 * @brief   Main program.

 *

 * @return  none

 */

int main(void)

{

    u8 data[SIZE];

 

    Delay_Init();

    USART_Printf_Init(115200);

    printf("SystemClk:%d\r\n", SystemCoreClock);

 

    AT24CXX_Init();

 

    printf("Start Write 24Cxx....\r\n");

    //AT24CXX_Write(50, (u8 *)TEXT_Buffer, SIZE); //官方是单个写入，多次重复

    AT24CXX_MulitWriteBytes(WR_Address, (u8 *)TEXT_Buffer, SIZE); //修改后是多次页写入

    printf("24Cxx Write Sucess!\r\n");

 

    Delay_Ms(50);

 

    printf("Start Read 24Cxx....\r\n");

    AT24CXX_MulitReadBytes(WR_Address,data,SIZE); //修改后是直接连续读取

    //AT24CXX_Read(100, data, SIZE); //官方程序是单个读取，多次重复

    printf("The Data Readed Is: \r\n");

    printf("%s\r\n", data);

 

    while(1);

}