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Why LIN_stack_S12_4_6_3 can't works well in s12xs128 to send SYNCH(0x55) even the data has moved successfully from SCI Data Register to Transmit Shift Register           

Question asked by ANGANG HAO on May 20, 2020
Latest reply on Jun 12, 2020 by Daniel Martynek

My mcu is s12xs128, and transceiver is TJA1020.

All the LIN register  is initialized by LIN_stack in lin_lld_sci.c file. Additionally I have updated _PTM.Bits.PTM6 and _DDRM.Bits.DDRM6 to 1 enable transceiver.

Why is the data in Transmit Shift Register can't be transferred successfully?