At Akiduki Denshi, you can buy consumer Infra Red Modules.
Gniibe bought PL-IRM-2161-C438 (100.- JPY for two modules), and connect one to STM32 part of STM8S Discovery Kit. We can input PIN with IR remote controller.
Since IR signal is easily monitored, it is not secure at all. This is just an experiment.
Yes, gniibe use FTDI2232D Module as JTAG dongle to write flash ROM on its STM32.
Here is the figure of the circuit.
PL-IRM-2161-C438
---------
| |
| |
| GND | -+- 3.3V --> + of C19
--------- |
Vout| | |Vcc |
Pin 4 of CN7 <--------+ | +-----+
_|_
/// --> Pin 3 of CN7
Gniibe uses the IR controller which comes with Dell Vostro.