STM32F103 + AT24C256的EEPROM

只看该作者 · 2014-9-17 10:40

STM32F103
我用的3.5的函数库和 AT24C256K的 EEPROM

这段代码我是在微雪电子的程序上修改了下，单看读写函数都没问题

但是我主程序开机要打印一定字节的数据想看看效果的话，发现超过1000个byte程序就无效果了。

读写函数如下：
【读】:
uint8_t I2C_Read(I2C_TypeDef *I2Cx, uint8_t I2C_Addr, uint16_t addr, uint8_t *buf, uint16_t num)    //256K 的EEPROM 传送WORD ADDRESS 是2个字节，修改addr和num类型
{
if(num==0)
return 1;

while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));

I2C_AcknowledgeConfig(I2Cx, ENABLE);

I2C_GenerateSTART(I2Cx, ENABLE);    //开始
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2Cx, ADDR_24C02N, I2C_Direction_Transmitter);    //Device Address    写
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

I2C_SendData(I2Cx, addr >> 8); //1st WORD Address    如果用的是2K的，则只需要传送1个字节
while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

/******************************************************************/ //2nd WORD Address
I2C_SendData(I2Cx, addr & 0xff);
while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/*****************************************************************/

I2C_GenerateSTART(I2Cx, ENABLE); //开始
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2Cx, I2C_Addr, I2C_Direction_Receiver); //Device Address 读
while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

while (num)
{
if(num==1)
{
     I2C_AcknowledgeConfig(I2Cx, DISABLE);
I2C_GenerateSTOP(I2Cx, ENABLE); //如果一定时间无ACK，则会发送停止信号
}

while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED));  /* EV7 */
      *buf = I2C_ReceiveData(I2Cx);    //数据
      buf++;
      /* Decrement the read bytes counter */
      num--;
}

I2C_AcknowledgeConfig(I2Cx, ENABLE);

return 0;
}

【写】：

/*******************************************************************************
* Function Name  : I2C_delay
* Description :
* Input       : None
* Output       : None
* Return       : None
* Attention    : None
*******************************************************************************/
static void I2C_delay(uint16_t cnt)
{
while(cnt--);
}

/*******************************************************************************
* Function Name  : I2C_AcknowledgePolling
* Description :
* Input       : I2C_TypeDef * , uint8_t
* Output       : None
* Return       : None
* Attention    : None
*******************************************************************************/
static void I2C_AcknowledgePolling(I2C_TypeDef *I2Cx, uint8_t I2C_Addr)
{
  vu16 SR1_Tmp;
  do
  {
I2C_GenerateSTART(I2Cx, ENABLE);
SR1_Tmp = I2C_ReadRegister(I2Cx, I2C_Register_SR1);
I2C_Send7bitAddress(I2Cx, I2C_Addr, I2C_Direction_Transmitter);
  }while(!(I2C_ReadRegister(I2Cx, I2C_Register_SR1) & 0x0002));

  I2C_ClearFlag(I2Cx, I2C_FLAG_AF);
  I2C_GenerateSTOP(I2Cx, ENABLE);
}

/*******************************************************************************
      I2C1单字节写函数
*******************************************************************************/
uint8_t I2C_WriteOneByte(I2C_TypeDef *I2Cx, uint8_t I2C_Addr, uint16_t addr, uint8_t value)
{
I2C_GenerateSTART(I2Cx, ENABLE);    //开始
    while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2Cx, I2C_Addr, I2C_Direction_Transmitter);         //Device Address 写
    while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

I2C_SendData(I2Cx, addr >> 8);    //First Word Address
    while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

/*************************************************************************/    //Second Word Address
I2C_SendData(I2Cx, addr & 0xff);
    while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/*************************************************************************/

I2C_SendData(I2Cx, value);    //Data
    while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_GenerateSTOP(I2Cx, ENABLE);    //结束

    I2C_AcknowledgePolling(I2Cx, I2C_Addr);

I2C_delay(2000);

return 0;
}

/*******************************************************************************
I2C1写函数
*******************************************************************************/
uint8_t I2C_Write(I2C_TypeDef *I2Cx, uint8_t I2C_Addr, uint16_t addr, uint8_t *buf, uint16_t num)
{
uint16_t err = 0;

while(num--)
{
if(I2C_WriteOneByte(I2Cx, I2C_Addr, addr++, *buf++))
{
err++;
}
}
if(err)
return 1;
else
return 0;
}

我主程序里如果把这个函数去掉，即使超过1000个字节也能正常

void XTCS_Init()    //系统参数默认值
{
uint8_t xtcs[16] = {0};
I2C_Read(I2C1, ADDR_24C02N, 49, xtcs, 16);
//抽测位置数据报告频度、GPS定位频度、航行速度门限值  判断是否从未保存过系统参数
if(((xtcs[2] == 0x00) || (xtcs[2] == 0xff)) && ((xtcs[3] == 0x00) || (xtcs[3] == 0xff)) && ((xtcs[6] == 0x00) || (xtcs[6] == 0xff)) && ((xtcs[7] == 0x00) || (xtcs[7] == 0xff)) && ((xtcs[10] == 0x00) || (xtcs[10] == 0xff)))
{
XTCS.serviceflag = 0x01;
XTCS.sleepflag = 0x01;
XTCS.positionfreq[0] = 0x00;    // 144 单位：10分钟
XTCS.positionfreq[1] = 0x90;
XTCS.routefreq1 = 0x0F;    // 15  单位：分钟
XTCS.routefreq2 = 0xF0;    // 240  单位：分钟
XTCS.gpsfreq[0] = 0x00;    //10 单位：秒
XTCS.gpsfreq[1] = 0x0A;
XTCS.routevalue = 0x0F;       //15 单位：度
XTCS.zerospeed_thresold = 0x02;    //2  单位： 0.1米/秒
XTCS.speed_thresold = 0x1A;    //26 单位： 0.1米/秒
XTCS.distinguish_thresold = 0x14; //20 单位：10米
XTCS.multidelay_thresold = 0x01;  //1  单位：分钟
XTCS.controlcenterID[0] = 0x00;    // 0 区域报警、多位置报告等自发自收
XTCS.controlcenterID[1] = 0x00;
XTCS.controlcenterID[2] = 0x00;
memset(XTCS.operator_name, 0, 16);//默认操作员名字编码为0
I2C_Write(I2C1, ADDR_24C02N, 49, &(XTCS.serviceflag), 1);
I2C_Write(I2C1, ADDR_24C02N, 50, &(XTCS.sleepflag), 1);
I2C_Write(I2C1, ADDR_24C02N, 51, &(XTCS.positionfreq[0]), 1);
I2C_Write(I2C1, ADDR_24C02N, 52, &(XTCS.positionfreq[1]), 1);
I2C_Write(I2C1, ADDR_24C02N, 53, &(XTCS.routefreq1), 1);
   I2C_Write(I2C1, ADDR_24C02N, 54, &(XTCS.routefreq2), 1);
I2C_Write(I2C1, ADDR_24C02N, 55, &(XTCS.gpsfreq[0]), 1);
I2C_Write(I2C1, ADDR_24C02N, 56, &(XTCS.gpsfreq[1]), 1);
I2C_Write(I2C1, ADDR_24C02N, 57, &(XTCS.routevalue), 1);
I2C_Write(I2C1, ADDR_24C02N, 58, &(XTCS.zerospeed_thresold), 1);
I2C_Write(I2C1, ADDR_24C02N, 59, &(XTCS.speed_thresold), 1);
I2C_Write(I2C1, ADDR_24C02N, 60, &(XTCS.distinguish_thresold), 1);
I2C_Write(I2C1, ADDR_24C02N, 61, &(XTCS.multidelay_thresold), 1);
I2C_Write(I2C1, ADDR_24C02N, 62, &(XTCS.controlcenterID[0]), 1);
I2C_Write(I2C1, ADDR_24C02N, 63, &(XTCS.controlcenterID[1]), 1);
I2C_Write(I2C1, ADDR_24C02N, 64, &(XTCS.controlcenterID[2]), 1);
}
else
{
XTCS.serviceflag = 0x01;
XTCS.sleepflag = 0x01;
XTCS.positionfreq[0] = xtcs[2];
XTCS.positionfreq[1] = xtcs[3];
XTCS.routefreq1 = xtcs[4];
XTCS.routefreq2 = xtcs[5];
XTCS.gpsfreq[0] = xtcs[6];
XTCS.gpsfreq[1] = xtcs[7];
XTCS.routevalue = xtcs[8];
XTCS.zerospeed_thresold = xtcs[9];
XTCS.speed_thresold = xtcs[10];
XTCS.distinguish_thresold = xtcs[11];
XTCS.multidelay_thresold = xtcs[12];
XTCS.controlcenterID[0] = xtcs[13];
XTCS.controlcenterID[1] = xtcs[14];
XTCS.controlcenterID[2] = xtcs[15];
memset(XTCS.operator_name, 0, 16);//默认操作员名字编码为0
}
}

大家能帮我看看，是因为我的读写函数不对了，还是我开机的这个 XTCS_Init() 不对了？