Help! nrf24l01 bidirectional communication between two arduinos

I have been trying to communicate my arduino mini and mega via nrf24l01 but it seems impossible for me.

I want to establish a bidirectional communication, so i tested unsuccessfully the RF24 and Mirf libraries.
Please someone has an idea or link? Thanks!

Did you try the GettingStarted example from the RF24 library? The MEGA has the SPI pins in another place. See Arduino Mega2560 R3 pinouts photo