Hi Dries,
Thank´s for your reply.
First I read the TID Serial number of each Tag by I2C (Addresses 4006h,4007h,4008h,4009h, 400Ah, 400Bh). In this case, I don´t have problems to obtain this Serial number.
As I have verified, the EPC ID is identical in all tags, but I need different EPC IDs in all tags that I´m going to use. So I want to write TID Serial number in the EPC ID memory bank.
I want to write the TID serial number by I2c in this EPC ID addresses (200Ah,200Bh,200Ch,200Dh,200Eh) but I can´t.
I don´t know why. Is this memory bank probably locked?
The reading process is always correct but the writing process always fail me. I use the same function to read/write by I2C in other pheripherals.
Settings of i2C:
Cpu frequency: 8Mhz
I2C clock frequency: 400khz
The functions I use are as follow:
uchar SL3S4011_Write (uint uiRegister, uint uiDate)
{
uchar ucResult = FALSE;
/* I2C */
unsigned char messageBuf[5];
unsigned char TWI_targetSlaveAddress;
TWI_targetSlaveAddress = 0x51;
// Send the request-for-data command to the Slave
messageBuf[0] = (TWI_targetSlaveAddress<<TWI_ADR_BITS) | (FALSE<<TWI_READ_BIT); // The first byte must always consit of General Call code or the TWI slave address.
messageBuf[1] = (uchar)(uiRegister >> 8);//Address
messageBuf[2] = (uchar)(uiRegister);
messageBuf[3] = (uchar) (uiDate >> 8);//Date
messageBuf[4] = (uchar)(uiDate);
TWI_Start_Transceiver_With_Data( messageBuf, 5 );
return (ucResult);
}
/****************************************************************************
Call this function to send a prepared message. The first byte must contain the slave address and the
read/write bit. Consecutive bytes contain the data to be sent, or empty locations for data to be read
from the slave. Also include how many bytes that should be sent/read including the address byte.
The function will hold execution (loop) until the TWI_ISR has completed with the previous operation,
then initialize the next operation and return.
****************************************************************************/
void TWI_Start_Transceiver_With_Data( unsigned char *msg, unsigned char msgSize )
{
unsigned char temp;
while ( TWI_Transceiver_Busy() ); // Wait until TWI is ready for next transmission.
TWI_msgSize = msgSize; // Number of data to transmit.
TWI_buf[0] = msg[0]; // Store slave address with R/W setting.
if (!( msg[0] & (TRUE<<TWI_READ_BIT) )) // If it is a write operation, then also copy data.
{
for ( temp = 1; temp < msgSize; temp++ )
TWI_buf[ temp ] = msg[ temp ];
}
TWI_statusReg.all = 0;
TWI_state = TWI_NO_STATE ;
TWCR = (1<<TWEN)| // TWI Interface enabled.
(1<<TWIE)|(1<<TWINT)| // Enable TWI Interupt and clear the flag.
(0<<TWEA)|(1<<TWSTA)|(0<<TWSTO)| // Initiate a START condition.
(0<<TWWC);
}
I found this information in other Post of this community:
https://community.nxp.com/thread/464218
I hope your answer.
Oscar.
