Thank you, you are right that was the problem.
I have one more question, about the I.S.O.18092 (N.F.C.P.I.-1).
How should I use the Perform response RF Collision Avoidance (n = 0) command(0x06), I mean, Is like the transmit with C.R.C. command, for example:
start condition
send the Perform response RF Collision Avoidance (n = 0) command
send the number of bits to the 0x1d an d0x1e registers
send the data to the F.I.F.O.
stop condition
Is like that?
Is similar the 0x05 command, the Perform response RF Collision Avoidance (n = 1,2,3)?
Thank you for your attention,
Daniel