As the following shows two frames, when 28035(slave) transmits frame 1 or frame 2, the checksum in LIN bus (captured by oscilloscope) is correct.
But when 28035(slave) transmits frame 1 and frame 2 alternately, the checksum are incorrect, for frame 1, the checksum is 0x3C (captured by oscilloscope), but not 0x3B, and for frame 2, the checksum is 0xFB (captured by oscilloscope), but not 0xFC.
Why that ? I do not know what is wrong.
Frame 1:
PID: 0xC4
DATA: 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
checksum = 0xFF-0xC4 = 0x3B = 0011 1011b
Frame 2 :
PID:0x03
DATA;0x01 0x01 0x01 0x01 0x01 0x01 0x01 0xF8
checksum = 0xFF-0x03 = 0xFC = 1111 1100b
