rfid

How would anyone know what the correct code is without knowing what kind of reader is used, what interface it uses, what the application is, what the use case is, etc.?

Nope.I just need the sample code for transmit and receive the data through the rfid reader.

What would be the communication interface between the RA6M3 and the RFID reader ?

i use the UART to connect the RA6m3 RFID

You can check the FSP UART documentation:

https://renesas.github.io/fsp/group___s_c_i___u_a_r_t.html

and the EK-RA6M3 UART example:

https://github.com/renesas/ra-fsp-examples/tree/master/example_projects/ek_ra6m3/sci_uart/sci_uart_ek_ra6m3_ep

However we cannot provide anything specific for your RFID reader.

You can check the FSP UART documentation:

https://renesas.github.io/fsp/group___s_c_i___u_a_r_t.html

and the EK-RA6M3 UART example:

https://github.com/renesas/ra-fsp-examples/tree/master/example_projects/ek_ra6m3/sci_uart/sci_uart_ek_ra6m3_ep

However we cannot provide anything specific for your RFID reader.