问题：通过IIC往EEPROM中写入一个数据，但是从该地址读取的数据总为0.
代码如下：
static void I2C_GPIO_Config(void)
{
GPIO_InitTypeDef I2C_GPIO_InitStruct;

RCC_AHB1PeriphClockCmd(I2C_SCL_CLK|I2C_SDA_CLK, ENABLE);
GPIO_PinAFConfig(I2C_SDA_PORT, I2C_SDA_PINSOURCE, GPIO_AF_I2C1);
GPIO_PinAFConfig(I2C_SCL_PORT, I2C_SCL_PINSOURCE, GPIO_AF_I2C1);

I2C_GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
I2C_GPIO_InitStruct.GPIO_OType = GPIO_OType_OD; /*经测试必须是OD输出，而不能是PP输出*/
I2C_GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
I2C_GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
I2C_GPIO_InitStruct.GPIO_Pin = I2C_SCL_PIN;
GPIO_Init(I2C_SCL_PORT, &I2C_GPIO_InitStruct);

I2C_GPIO_InitStruct.GPIO_Pin = I2C_SDA_PIN;
GPIO_Init(I2C_SDA_PORT, &I2C_GPIO_InitStruct);

}

void I2C_Config(void)
{
I2C_GPIO_Config();
RCC_APB1PeriphClockCmd(I2C_CLK, ENABLE);

I2C_InitTypeDef I2C_InitStruct;
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct.I2C_ClockSpeed  = 400000;
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable ;
I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStruct.I2C_OwnAddress1 = 0xA0;
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

I2C_Init(I2C1, &I2C_InitStruct);
I2C_Cmd (I2C1, ENABLE);
}

static uint32_t ErrorCallback(u8 error_code)
{
printf("\r\nerror code:%hhd\n\r", error_code);
return 1;
}

/*
@brief: 写入一个字节
@para1: 指向1个字节数据源的指针
@retval: 状态值，0表示正常

*/

uint8_t I2C_SendByte(uint8_t* pBuffer, uint8_t Addr_of_EE)
{
////////////////////
I2C_GenerateSTART(I2C, ENABLE);

uint32_t timer = TIMEOUT;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_MODE_SELECT))
{
timer--;
if(timer == 0)  ErrorCallback(1);
}

////////////////////
I2C_Send7bitAddress(I2C, EEPROM_ADDR, I2C_Direction_Transmitter);
timer = TIMEOUT;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
timer--;
if(timer == 0 ) ErrorCallback(2);
}

////////////////////////
I2C_SendData(I2C, Addr_of_EE);
timer = TIMEOUT;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timer--;
if(timer == 0 ) ErrorCallback(3);
}

I2C_SendData(I2C, *pBuffer);
timer = TIMEOUT;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
timer--;
if(timer == 0 ) ErrorCallback(4);
}

I2C_GenerateSTOP(I2C, ENABLE);
return 0;

}

/*
@brief: 读取字节
@
@retval:

*/

uint8_t I2C_EE_Read(uint8_t* pDstBuffer, uint8_t Addr_of_EE, uint16_t size)
{
Wait_EE_Ready();

I2C_GenerateSTART(I2C, ENABLE);
uint32_t timer = TIMEOUT;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_MODE_SELECT))
{
timer--;
if(timer == 0)  ErrorCallback(9);
}

I2C_Send7bitAddress(I2C, EEPROM_ADDR, I2C_Direction_Transmitter);
timer = TIMEOUT;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
timer--;
if(timer == 0) ErrorCallback(10);
}

I2C_SendData(I2C, Addr_of_EE);
timer = TIMEOUT;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
if(timer-- == 0 ) ErrorCallback(11);
}

Wait_EE_Ready();
I2C_GenerateSTART(I2C, ENABLE);
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_MODE_SELECT))
{
timer--;
if(timer == 0)  ErrorCallback(12);
}

I2C_Send7bitAddress(I2C, EEPROM_ADDR, I2C_Direction_Receiver);
timer =TIMEOUT;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
{
if(timer-- == 0) ErrorCallback(13);
}

I2C_AcknowledgeConfig(I2C, ENABLE);
while(size)
{
if(size == 1)
{
I2C_AcknowledgeConfig(I2C, DISABLE);
I2C_GenerateSTOP(I2C, ENABLE);
}
timer =TIMEOUT;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_RECEIVED))
{
if(timer-- == 0) ErrorCallback(14);
}
*pDstBuffer = I2C_ReceiveData(I2C);
pDstBuffer++;
size--;

}

I2C_AcknowledgeConfig(I2C, ENABLE);

return 0;
}

//main.c

int main(void){

   Usart_Config();
   I2C_Config();
   GPIO_LED_CONFIG();

   printf("测试一下I2C写/读EEPROM，通过串口输出\n");

   uint8_t data[2]= {0xFF,0xAB};
   uint8_t stat;
   uint8_t* pDstBuffer;

   stat = I2C_SendByte(data, 0x00);
   printf("%d\n", stat);
   stat = I2C_EE_Read(pDstBuffer, 0x00, 1);
   printf("%d\n", stat);

   printf("the data @ 0x00 is :%x\n", *pDstBuffer);
   GPIO_LED_RED_ON;

   while(1)
   {
   }

}

求大神帮忙debug

link环境下使用codefirst的技术制作一个《网盘软件》，请问如何断点续传？

zjbonrace

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