附上i2c读写24c的程序参考,基本上按照开发板上示例搬来的.
附上i2c读写24c的程序参考,基本上按照开发板上示例搬来的.
ErrorStatus I2C_24c16_Status(void)
{
u32 I2C_TimeOut = 0x3FFFF;
/* Clear the I2C1 AF flag */
I2C_ClearFlag(I2C1, I2C_FLAG_AF);
/* Enable I2C1 acknowledgement if it is already disabled by other function */
I2C_AcknowledgeConfig(I2C1, ENABLE);
/*----- Transmission Phase -----*/
/* Send I2C1 START condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on I2C1 EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) /* EV5 */
{
}
//I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT);
/* Send STLM75 slave address for write */
I2C_Send7bitAddress(I2C1, AT24C512_Addr, I2C_Direction_Transmitter);
while((!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) && I2C_TimeOut)/* EV6 */
{
I2C_TimeOut--;
}
if(I2C_GetFlagStatus(I2C1, I2C_FLAG_AF) != 0x0)
{
return ERROR;
}
else
{
return SUCCESS;
}
}
/*******************************************************************************
* Function Name : Read24c16
* Description : Displays the temperature in Celsius and fahrenheit degree.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void Read24c16(u8 *RamAddress,u16 RomAddress,u8 bytes)
{
if(I2C_24c16_Status() == SUCCESS)
{
I2C_SendData(I2C1, (u8)(RomAddress >> 8));
/* Test on I2C1 EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
{
}
I2C_SendData(I2C1, (u8)(RomAddress &0xff));
/* Test on I2C1 EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
{
}
/*----- Reception Phase -----*/
/* Send Re-STRAT condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) /* EV5 */
{
}
/* Send STLM75 slave address for read */
I2C_Send7bitAddress(I2C1, AT24C512_Addr, I2C_Direction_Receiver);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)) /* EV6 */
{
}
/* Test on EV7 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) /* EV7 */
{
}
/* Store I2C1 received data */
while(bytes!=1) {
*RamAddress=I2C_ReceiveData(I2C1);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) /* EV7 */
{
}
RamAddress++;
bytes--;
}
/* Disable I2C1 acknowledgement */
I2C_AcknowledgeConfig(I2C1, DISABLE);
/* Send I2C1 STOP Condition */
I2C_GenerateSTOP(I2C1, ENABLE);
/* Test on EV7 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) /* EV7 */
{
}
/* Store I2C1 received data */
*RamAddress=I2C_ReceiveData(I2C1);
/* Return Temperature value */
}
}
void Write24c16(u8 *Wdata,u16 RomAddress,u8 bytes)
{
if(I2C_24c16_Status() == SUCCESS)
{
I2C_SendData(I2C1, (u8)(RomAddress >> 8));
/* Test on I2C1 EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
{
}
I2C_SendData(I2C1, (u8)(RomAddress &0xff));
/* Test on I2C1 EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
{
}
for(;bytes!=0;bytes--) {
// Write8Bit(*Wdata);
I2C_SendData(I2C1, *Wdata++);
/* Test on I2C1 EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
{
}
}
/* Send I2C1 STOP Condition */
I2C_GenerateSTOP(I2C1, ENABLE);
Delay(10);
}
}
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