topic MPC5744P Linflex data length set in MPC5xxx

MPC5744P Linflex data length set

doriahuang — Wed, 13 May 2020 11:31:53 GMT

I use MPC5744P LINFLEX port in master mode，about the length setting of Lin in MPC5744P. According to the register configuration data in the data manual, the length is DFL=Number of data bytes -1, which cannot be configured to 0. Now I want to configure this length to 0 in practice, how should I set it?

I want to only send frame header,example ID 0X0F,no need date frame.

Re: MPC5744P Linflex data length set

PetrS — Wed, 13 May 2020 15:23:29 GMT

Hi,

what is a use case in fact?
You can set DIR=0 in BIDR so LINFlex as master will send a header only and wait for response from slave. You can then set a LINCR2[DDRQ] bit to discard a response and return to idle state.

BR,Petr

Re: MPC5744P Linflex data length set

1692470640 — Mon, 29 Jun 2020 02:53:37 GMT

Dear Petr，

How can i send frame data in master mode? In other words,if i only send frame header, when i receive the DTF interrupt,can i send fram data only?

Re: MPC5744P Linflex data length set

1692470640 — Mon, 29 Jun 2020 05:57:04 GMT

Dear Petrel，

There's another problem here：How can i receive frames of any length in either master mode or slave mode.