今天写了个硬件IIC程序，写的是存一个数据，然后读出来（这个和书上的代码不同，书上的代码不能确定字节地址的）。直接烧录到开发板上用串口查看，发现得到的数值比预计的多1，然后仿真看数值，结果是一样的，求解。
#define EEP_Firstbyte 0x01
u8 I2c_Buf_Write;
u8 I2c_Buf_Read;
void I2C_EE_ByteWrite(u8 pBuffer, u8 WriteAddr)
{
/* Send STRAT condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/* Send the EEPROM's internal address to write to */
I2C_SendData(I2C1, WriteAddr);
/* Test on EARM and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send the byte to be written */
I2C_SendData(I2C1, pBuffer);
/* Test on EARM and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send STOP condition */
I2C_GenerateSTOP(I2C1, ENABLE);
}
void I2C_EE_ByteRead(u8 ReadAddr)
{
//*((u8 *)0x4001080c) |=0x80;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); // Added by Najoua 27/08/2008
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);
//*((u8 *)0x4001080c) &=~0x80;
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/* Clear EV6 by setting again the PE bit */
I2C_Cmd(I2C1, ENABLE);
/* Send the EEPROM's internal address to write to */
I2C_SendData(I2C1, ReadAddr);
/* Test on EARM and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send STRAT condition a second time */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/* Send EEPROM address for read */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Receiver);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
I2c_Buf_Read = I2C_ReceiveData(I2C1);
// while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
I2C_AcknowledgeConfig(I2C1, DISABLE);
/* Send STOP Condition */
I2C_GenerateSTOP(I2C1, ENABLE);
}
void I2C_Test(void)
{
printf("写入的数据\n\r");
I2c_Buf_Write=10;
I2C_EE_ByteWrite(I2c_Buf_Write, EEP_Firstbyte);
I2C_EE_WaitEepromStandbyState();
printf("\n\r写成功\n\r");
printf("\n\r读出的数据\n\r");
I2C_EE_ByteRead(EEP_Firstbyte);
if(I2c_Buf_Read != I2c_Buf_Write)
{
printf("0x%02X ", I2c_Buf_Read);
printf("错误:I2C EEPROM写入与读出的数据不一致\n\r");
return;
}
printf("0x%02X \n", I2c_Buf_Read);
printf("I2C(AT24C02)读写测试成功\n\r");
} |
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