LIN Master-Slave Communication Issue for MPC5748G

sjoshi33 — Fri, 14 May 2021 13:53:31 GMT

Hi,

I am testing LIN Master-Slave Communication over MPC5748. I am using LINFlexD_0 as Slave and LINFlexD_2 as Master. Schematic for LIN transceiver is attached. (Note – Jumper J1 is not used)
I am using example code from - https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/Example-MPC5748G-LINFlex-LIN-Master-Slave-test-GHS616/ta-p/1117197
I observe that the program is infinitely stuck in the while(0 == LINFlexD_2.LINSR.B.DTF) of below function.

void TransmitData(uint16_t bidr_value)
{
/* store the data in the message buffer BDR */
LINFlexD_2.BDRL.B.DATA0 = 'H';
LINFlexD_2.BDRL.B.DATA1 = 'e';
LINFlexD_2.BDRL.B.DATA2 = 'l';
LINFlexD_2.BDRL.B.DATA3 = 'l';

LINFlexD_2.BDRM.B.DATA4 = 'o';
LINFlexD_2.BDRM.B.DATA5 = '!';
LINFlexD_2.BDRM.B.DATA6 = '!';
LINFlexD_2.BDRM.B.DATA7 = '!';

/* Master to publish x bytes with ID and CCS from bidr_value */
LINFlexD_2.BIDR.R = bidr_value;

/* Request header transmission */
LINFlexD_2.LINCR2.B.HTRQ = 1;

/* Wait for data transfer complete flag */
while(0 == LINFlexD_2.LINSR.B.DTF);

/* clear the DTF bit */
LINFlexD_2.LINSR.R = 0x0002;
}

Please advise.

Regards,
Shantanu Joshi

Re: LIN Master-Slave Communication Issue for MPC5748G

jnaulet — Fri, 17 Dec 2021 16:02:04 GMT

It's a little late but i think you forgot to configure BIDR DIR & DFL fields

topic Re: LIN Master-Slave Communication Issue for MPC5748G in MPC5xxx

LIN Master-Slave Communication Issue for MPC5748G

Re: LIN Master-Slave Communication Issue for MPC5748G