I am trying to serially interface a RFID module to LPC2378(MCB2300). I have tried interfacing in the following two ways: i) via the RS232 cable to the DB9 connector ii) directly from the transmitter pin of the RFID to P0.16 of LPC2378. I used a logic-level converter of 5v to 3.3v for the pin-to-pin connection.
None of the above ways worked.
I tried to send data between pin P0.2 (UART0) to P0.16 (UART1) of LPC, which worked.
I sent the same via the logic-level converter in a loop-back mode i.e., input is fed to 3.3v pin, output taken at 5v, this output is looped-back to another 5v and received back at 3.3v, which means the converter is working fine.
The RFID module is also working and I was able to capture its output on the hyperterminal.
The RFID works at 9600bauds/sec (tested on hyperterminal) and we used the same baud rate in LPC as well.
Is there any other parameter that I need to consider?