Hi LexLiu,
Thank you for your help. Due to our special engineering requirements, we may need to connect 1, 2, 3, or 4 fuel injectors in actual use. My current demo only connects 1 and 2 fuel injectors. During the self-test process, the Bootstrap check's rxData=send_stngle_SPI_Cmd (READ, ioobuttostrap_charged, 0x00); I read 0xD394, and this self-test failed, so I annotated this check. May I ask if this is related to the fact that the startup signal is not working after me? Additionally, how can I configure an application that meets my requirement for connecting the number of fuel injectors freely?