I think that the part before the highlighted is the switch from JTAG to SWD. The part highlighted looks like the read of DAP register DPIDR. On STLink V2 you get the ACK reply and the value On STLink V3 clone looks like the ACK is missing. But it would require zooming in the picture and analyze the bits to confirm it
--- ** [tickets:#373] ST-LINK V3SET fails to enter SWD ** **Status:** new **Milestone:** 0.11.0 **Created:** Wed Dec 07, 2022 08:57 AM UTC by Tanguy Serrat **Last Updated:** Wed Dec 07, 2022 05:21 PM UTC **Owner:** nobody Hi, I am running into some issues to connect with a target using an ST-LINK V3SET. The setup is : - Target: STM32F723IEK6 - Interface: SWD (dapdirect_swd / hla_swd) - OS: 5.13.0-35-generic #40~20.04.1-Ubuntu - OpenOcd: Open On-Chip Debugger 0.12.0-rc2+dev-00989-g9501b263e (2022-12-06-23:45) - libusb: libusb-1.0-0-dev/focal,now 2:1.0.23-2build1 amd64 The issue seems to be related to USB problems. The error is stlink_usb_error_check(): STLINK_JTAG_GET_IDCODE_ERROR when running : `openocd -d -f /usr/local/share/openocd/scripts/interface/stlink-dap.cfg -f /usr/local/share/openocd/scripts/target/stm32f7x.cfg` Output is: ~~~ Info : 88 3 server.c:297 add_service(): Listening on port 6666 for tcl connections Info : 89 3 server.c:297 add_service(): Listening on port 4444 for telnet connections Debug: 90 3 command.c:155 script_debug(): command - init Debug: 91 3 command.c:155 script_debug(): command - target init Debug: 92 3 command.c:155 script_debug(): command - target names Debug: 93 3 command.c:155 script_debug(): command - stm32f7x.cpu cget -event gdb-flash-erase-start Debug: 94 3 command.c:155 script_debug(): command - stm32f7x.cpu configure -event gdb-flash-erase-start reset init Debug: 95 3 command.c:155 script_debug(): command - stm32f7x.cpu cget -event gdb-flash-write-end Debug: 96 3 command.c:155 script_debug(): command - stm32f7x.cpu configure -event gdb-flash-write-end reset halt Debug: 97 3 command.c:155 script_debug(): command - stm32f7x.cpu cget -event gdb-attach Debug: 98 3 command.c:155 script_debug(): command - stm32f7x.cpu configure -event gdb-attach halt 1000 Debug: 99 3 target.c:1657 handle_target_init_command(): Initializing targets... Debug: 100 3 semihosting_common.c:109 semihosting_common_init(): Debug: 101 3 stlink_usb.c:5081 stlink_dap_init(): stlink_dap_init() Debug: 102 3 stlink_usb.c:3693 stlink_open(): stlink_open Debug: 103 3 stlink_usb.c:3705 stlink_open(): transport: 4 vid: 0x0483 pid: 0x3744 serial: Debug: 104 3 stlink_usb.c:3705 stlink_open(): transport: 4 vid: 0x0483 pid: 0x3748 serial: Debug: 105 3 stlink_usb.c:3705 stlink_open(): transport: 4 vid: 0x0483 pid: 0x374b serial: Debug: 106 3 stlink_usb.c:3705 stlink_open(): transport: 4 vid: 0x0483 pid: 0x374d serial: Debug: 107 3 stlink_usb.c:3705 stlink_open(): transport: 4 vid: 0x0483 pid: 0x374e serial: Debug: 108 3 stlink_usb.c:3705 stlink_open(): transport: 4 vid: 0x0483 pid: 0x374f serial: Debug: 109 3 stlink_usb.c:3705 stlink_open(): transport: 4 vid: 0x0483 pid: 0x3752 serial: Debug: 110 3 stlink_usb.c:3705 stlink_open(): transport: 4 vid: 0x0483 pid: 0x3753 serial: Debug: 111 3 stlink_usb.c:3705 stlink_open(): transport: 4 vid: 0x0483 pid: 0x3754 serial: Info : 112 7 stlink_usb.c:1434 stlink_usb_version(): STLINK V3J10M3B5S1 (API v3) VID:PID 0483:3753 Debug: 113 7 stlink_usb.c:1659 stlink_usb_exit_mode(): MODE: 0x01 Info : 114 7 stlink_usb.c:1470 stlink_usb_check_voltage(): Target voltage: 3.347832 Debug: 115 7 stlink_usb.c:1727 stlink_usb_init_mode(): MODE: 0x01 Debug: 116 7 stlink_usb.c:3093 stlink_dump_speed_map(): Supported clock speeds are: Debug: 117 7 stlink_usb.c:3096 stlink_dump_speed_map(): 24000 kHz Debug: 118 7 stlink_usb.c:3096 stlink_dump_speed_map(): 8000 kHz Debug: 119 7 stlink_usb.c:3096 stlink_dump_speed_map(): 3300 kHz Debug: 120 7 stlink_usb.c:3096 stlink_dump_speed_map(): 1000 kHz Debug: 121 7 stlink_usb.c:3096 stlink_dump_speed_map(): 200 kHz Debug: 122 7 stlink_usb.c:3096 stlink_dump_speed_map(): 50 kHz Debug: 123 7 stlink_usb.c:3096 stlink_dump_speed_map(): 5 kHz Debug: 124 37 stlink_usb.c:1086 stlink_usb_error_check(): STLINK_JTAG_GET_IDCODE_ERROR Error: 125 37 stlink_usb.c:3748 stlink_open(): init mode failed (unable to connect to the target) Debug: 126 37 stlink_usb.c:1659 stlink_usb_exit_mode(): MODE: 0x01 Debug: 127 37 command.c:544 run_command(): Command 'init' failed with error code -4 User : 128 37 command.c:608 command_run_line(): Debug: 129 37 target.c:2199 target_free_all_working_areas_restore(): freeing all working areas ~~~ The usb device is enumerated in dmesg : ~~~ [171481.193449] usb 1-4.2: New USB device found, idVendor=0483, idProduct=3753, bcdDevice= 1.00 [171481.193461] usb 1-4.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [171481.193467] usb 1-4.2: Product: STLINK-V3 [171481.193471] usb 1-4.2: Manufacturer: STMicroelectronics [171481.193475] usb 1-4.2: SerialNumber: 0019001C3656501420363341 [171481.198570] cdc_acm 1-4.2:1.1: ttyACM0: USB ACM device [171481.199678] cdc_acm 1-4.2:1.4: ttyACM1: USB ACM device ~~~ Running stlink command `st-trace -v`: ~~~ Failed to parse flash type or unrecognized flash type 2022-12-07T09:08:55 DEBUG trace.c: show_help = false 2022-12-07T09:08:55 DEBUG trace.c: show_version = false 2022-12-07T09:08:55 DEBUG trace.c: logging_level = 100 2022-12-07T09:08:55 DEBUG trace.c: core_frequency = 0 Hz 2022-12-07T09:08:55 DEBUG trace.c: trace_frequency = 0 Hz 2022-12-07T09:08:55 DEBUG trace.c: reset_board = true 2022-12-07T09:08:55 DEBUG trace.c: force = false 2022-12-07T09:08:55 DEBUG trace.c: serial_number = any 2022-12-07T09:08:55 DEBUG common.c: *** looking up stlink version 2022-12-07T09:08:55 DEBUG common.c: st vid = 0x0483 (expect 0x0483) 2022-12-07T09:08:55 DEBUG common.c: stlink pid = 0x3753 2022-12-07T09:08:55 DEBUG common.c: stlink version = 0x3 2022-12-07T09:08:55 DEBUG common.c: jtag version = 0xa 2022-12-07T09:08:55 DEBUG common.c: swim version = 0x1 2022-12-07T09:08:55 DEBUG common.c: stlink current mode: mass 2022-12-07T09:08:55 DEBUG usb.c: JTAG/SWD freq set to 0 2022-12-07T09:08:55 DEBUG common.c: stlink current mode: mass 2022-12-07T09:08:55 DEBUG common.c: *** stlink_enter_swd_mode *** 2022-12-07T09:08:55 DEBUG usb.c: ENTER_SWD error (0x09) Failed to enter SWD mode 2022-12-07T09:08:55 ERROR trace.c: Your stlink is not connected to a device ~~~ This seems to be somehow related to [#325](https://sourceforge.net/p/openocd/tickets/325/) [#308](https://sourceforge.net/p/openocd/tickets/308/) . 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