RFID library

AN2399

20/22

Here are the functions used for I/O Frame register access:

int Write_CRX14_IOFR(UCHAR *DATA)

int Read_CRX14_IOFR(UCHAR *DATA)

8.4

STR710. It is a part of the STR710 library. Some functionality was added in order to receive

(I2C_TIMEOUT_SEND and I2C_TIMEOUT_RECEIVE) inform the application layer about

Below the code added for I2C_ByteSend and I2C_ByteReceive functions.

8.4.1

I2C_ByteSend_with_status function

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

* Function Name

: I2C_ByteSend

* Description

: Send a single byte of data.

* Input

: I2Cx ( I2C0 or I2C1 )

*

Data : the byte to be sent to the slave

* Return

: status: 0-byte sent, 1-transmission error.

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

u8 I2C_ByteSend_with_status (I2C_TypeDef *I2Cx, u8 Data)

{

u8 status=0;

u32 timeout=I2C_TIMEOUT_SEND;

//Wait until the I2C_BTF bit is set

while (((I2Cx->SR1 & 0x08)==0)&&timeout--);

if(!timeout) status=1;

//Write in the DR register the byte to be sent

I2Cx->DR = Data;

return status;

}

8.4.2

I2C_ByteReceive_with_status function

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

* Function Name

: I2C_ByteReceive

* Description

: Returns the received byte.

* Input

: I2Cx ( I2C0 or I2C1 )

* Output

: Data ( variable where store read data )

* Return

: status: 0-byte sent, 1-transmission error.

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

u8 I2C_ByteReceive_with_status (I2C_TypeDef *I2Cx, u8 *Data)

{

u8 status=0;

u32 timeout=I2C_TIMEOUT_RECEIVE;

//Wait till I2C_BTF bit is set

while (((I2Cx->SR1 & 0x08)==0)&&timeout--);

if(!timeout) status=1;

(*Data)=I2Cx->DR;

return status;

}