https://devzone.nordicsemi.com/f/nordic-q-a/35621/nrf52832-bluefruit-feather-openocd-unable-to-connect-to-the-targetDear all, I did below steps to connect to the BluFruit Feather board via STLink V2: 1) Install OpenOcd and STLink USB driver as: https://pcbreflux.blogspot.com/2016/09/nrf52832-first-steps-with-st-link-v2.html + OpenOcd has been configured asen-USTelligent Community 13Thu, 21 Jun 2018 15:17:52 GMThttps://devzone.nordicsemi.com/thread/137146?ContentTypeID=1Thu, 21 Jun 2018 15:17:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d0d624e0-5ebd-4e4a-a402-402dcff96238DINH LAM<p>I did the job by connecting to proper SWDIO/SWCLK pin.</p> <p><a href="https://devzone.nordicsemi.com/f/nordic-q-a/23361/can-adafruit-feather-be-programmed-with-nrf51-sdk/91835#91835">devzone.nordicsemi.com/.../91835</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/137123?ContentTypeID=1Thu, 21 Jun 2018 13:56:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:367ea1b9-7a5f-4e76-b21d-ec59c04efdc1DINH LAM<p>Hi,</p> <p></p> <p>I would like to add additional log (debug level = 3) when running OpenOcd:</p> <p>./src/openocd -s ../tcl/ -d3 -f openocd_nrf52.cfg<br />Open On-Chip Debugger 0.10.0+dev-00430-g0612315 (2018-06-15-10:18)<br />Licensed under GNU GPL v2<br />For bug reports, read<br /> <a href="http://openocd.org/doc/doxygen/bugs.html">openocd.org/.../bugs.html</a><br />User : 13 3 command.c:544 command_print(): debug_level: 3<br />Debug: 14 3 options.c:184 add_default_dirs(): bindir=/usr/local/bin<br />Debug: 15 3 options.c:185 add_default_dirs(): pkgdatadir=/usr/local/share/openocd<br />Debug: 16 3 options.c:186 add_default_dirs(): exepath=/home/lamdinh/work/tools/openocd/_build/src<br />Debug: 17 3 options.c:187 add_default_dirs(): bin2data=../share/openocd<br />Debug: 18 3 configuration.c:42 add_script_search_dir(): adding /home/lamdinh/.openocd<br />Debug: 19 3 configuration.c:42 add_script_search_dir(): adding /home/lamdinh/work/tools/openocd/_build/src/../share/openocd/site<br />Debug: 20 3 configuration.c:42 add_script_search_dir(): adding /home/lamdinh/work/tools/openocd/_build/src/../share/openocd/scripts<br />Debug: 21 4 configuration.c:97 find_file(): found openocd_nrf52.cfg<br />Debug: 22 4 configuration.c:97 find_file(): found ../tcl//interface/stlink.cfg<br />Debug: 23 4 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_interface hla<br />Debug: 24 4 command.c:143 script_debug(): command - interface ocd_interface hla<br />Debug: 26 4 command.c:364 register_command_handler(): registering &#39;ocd_hla_device_desc&#39;...<br />Debug: 27 4 command.c:364 register_command_handler(): registering &#39;ocd_hla_serial&#39;...<br />Debug: 28 4 command.c:364 register_command_handler(): registering &#39;ocd_hla_layout&#39;...<br />Debug: 29 4 command.c:364 register_command_handler(): registering &#39;ocd_hla_vid_pid&#39;...<br />Debug: 30 4 command.c:364 register_command_handler(): registering &#39;ocd_hla_command&#39;...<br />Debug: 31 4 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_hla_layout stlink<br />Debug: 32 4 command.c:143 script_debug(): command - hla_layout ocd_hla_layout stlink<br />Debug: 34 4 hla_interface.c:244 hl_interface_handle_layout_command(): hl_interface_handle_layout_command<br />Debug: 35 4 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_hla_device_desc ST-LINK<br />Debug: 36 4 command.c:143 script_debug(): command - hla_device_desc ocd_hla_device_desc ST-LINK<br />Debug: 38 4 hla_interface.c:218 hl_interface_handle_device_desc_command(): hl_interface_handle_device_desc_command<br />Debug: 39 4 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_hla_vid_pid 0x0483 0x3744 0x0483 0x3748 0x0483 0x374b<br />Debug: 40 4 command.c:143 script_debug(): command - hla_vid_pid ocd_hla_vid_pid 0x0483 0x3744 0x0483 0x3748 0x0483 0x374b<br />Debug: 42 4 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_transport select hla_swd<br />Debug: 43 5 command.c:143 script_debug(): command - ocd_transport ocd_transport select hla_swd<br />Debug: 44 5 hla_transport.c:191 hl_transport_select(): hl_transport_select<br />Debug: 45 5 command.c:364 register_command_handler(): registering &#39;ocd_hla&#39;...<br />Debug: 46 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag&#39;...<br />Debug: 47 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag&#39;...<br />Debug: 48 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag&#39;...<br />Debug: 49 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag&#39;...<br />Debug: 50 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag&#39;...<br />Debug: 51 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag&#39;...<br />Debug: 52 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag&#39;...<br />Debug: 53 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag&#39;...<br />Debug: 54 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag&#39;...<br />Debug: 55 5 command.c:364 register_command_handler(): registering &#39;ocd_jtag_ntrst_delay&#39;...<br />Debug: 56 5 configuration.c:97 find_file(): found ../tcl//target/nrf52.cfg<br />Debug: 57 5 configuration.c:97 find_file(): found ../tcl//target/swj-dp.tcl<br />Debug: 58 5 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_transport select<br />Debug: 59 5 command.c:143 script_debug(): command - ocd_transport ocd_transport select<br />Debug: 60 5 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_transport select<br />Debug: 61 5 command.c:143 script_debug(): command - ocd_transport ocd_transport select<br />Debug: 62 5 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_transport select<br />Debug: 63 5 command.c:143 script_debug(): command - ocd_transport ocd_transport select<br />Debug: 64 6 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_transport select<br />Debug: 65 6 command.c:143 script_debug(): command - ocd_transport ocd_transport select<br />Debug: 66 6 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_hla newtap nrf52 cpu -expected-id 0x2ba01477<br />Debug: 67 6 command.c:143 script_debug(): command - ocd_hla ocd_hla newtap nrf52 cpu -expected-id 0x2ba01477<br />Debug: 68 6 hla_tcl.c:111 jim_hl_newtap_cmd(): Creating New Tap, Chip: nrf52, Tap: cpu, Dotted: nrf52.cpu, 2 params<br />Debug: 69 6 hla_tcl.c:121 jim_hl_newtap_cmd(): Processing option: -expected-id<br />Debug: 70 6 core.c:1304 jtag_tap_init(): Created Tap: nrf52.cpu @ abs position 0, irlen 0, capture: 0x0 mask: 0x0<br />Debug: 71 6 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_dap create nrf52.dap -chain-position nrf52.cpu<br />Debug: 72 6 command.c:143 script_debug(): command - ocd_dap ocd_dap create nrf52.dap -chain-position nrf52.cpu<br />Debug: 73 6 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_target create nrf52.cpu cortex_m -dap nrf52.dap<br />Debug: 74 6 command.c:143 script_debug(): command - ocd_target ocd_target create nrf52.cpu cortex_m -dap nrf52.dap<br />Info : 75 6 target.c:5532 target_create(): The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD<br />Debug: 76 6 hla_target.c:367 adapter_target_create(): adapter_target_create<br />Debug: 77 6 hla_target.c:338 adapter_init_arch_info(): adapter_init_arch_info<br />Debug: 78 6 command.c:364 register_command_handler(): registering &#39;ocd_arm&#39;...<br />Debug: 79 6 command.c:364 register_command_handler(): registering &#39;ocd_arm&#39;...<br />Debug: 80 6 command.c:364 register_command_handler(): registering &#39;ocd_arm&#39;...<br />Debug: 81 6 command.c:364 register_command_handler(): registering &#39;ocd_arm&#39;...<br />Debug: 82 6 command.c:364 register_command_handler(): registering &#39;ocd_arm&#39;...<br />Debug: 83 6 command.c:364 register_command_handler(): registering &#39;ocd_arm&#39;...<br />Debug: 84 6 command.c:364 register_command_handler(): registering &#39;ocd_arm&#39;...<br />Debug: 85 6 command.c:364 register_command_handler(): registering &#39;ocd_arm&#39;...<br />Debug: 86 6 command.c:364 register_command_handler(): registering &#39;ocd_arm&#39;...<br />Debug: 87 6 command.c:364 register_command_handler(): registering &#39;ocd_tpiu&#39;...<br />Debug: 88 6 command.c:364 register_command_handler(): registering &#39;ocd_itm&#39;...<br />Debug: 89 6 command.c:364 register_command_handler(): registering &#39;ocd_itm&#39;...<br />Debug: 90 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 91 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 92 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 93 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 94 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 95 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 96 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 97 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 98 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 99 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 100 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 101 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 102 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 103 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 104 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 105 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 106 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 107 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 108 6 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 109 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 110 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 111 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 112 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 113 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 114 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 115 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 116 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 117 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 118 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 119 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 120 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 121 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 122 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 123 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 124 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 125 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf52.cpu&#39;...<br />Debug: 126 7 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_adapter_khz 1000<br />Debug: 127 7 command.c:143 script_debug(): command - adapter_khz ocd_adapter_khz 1000<br />Debug: 129 7 core.c:1645 jtag_config_khz(): handle jtag khz<br />Debug: 130 7 core.c:1612 adapter_khz_to_speed(): convert khz to interface specific speed value<br />Debug: 131 7 core.c:1612 adapter_khz_to_speed(): convert khz to interface specific speed value<br />User : 132 7 command.c:544 command_print(): adapter speed: 1000 kHz<br />Debug: 133 7 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_nrf52.cpu configure -work-area-phys 0x20000000 -work-area-size 0x4000 -work-area-backup 0<br />Debug: 134 7 command.c:143 script_debug(): command - ocd_nrf52.cpu ocd_nrf52.cpu configure -work-area-phys 0x20000000 -work-area-size 0x4000 -work-area-backup 0<br />Debug: 135 7 target.c:1971 target_free_all_working_areas_restore(): freeing all working areas<br />Debug: 136 7 target.c:1971 target_free_all_working_areas_restore(): freeing all working areas<br />Debug: 137 7 target.c:1971 target_free_all_working_areas_restore(): freeing all working areas<br />Debug: 138 7 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_transport select<br />Debug: 139 7 command.c:143 script_debug(): command - ocd_transport ocd_transport select<br />Debug: 140 7 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_flash bank nrf52.flash nrf5 0x00000000 0 1 1 nrf52.cpu<br />Debug: 141 7 command.c:143 script_debug(): command - ocd_flash ocd_flash bank nrf52.flash nrf5 0x00000000 0 1 1 nrf52.cpu<br />Debug: 143 7 command.c:323 command_new(): BUG: command &#39;nrf5 mass_erase&#39; does not have the &#39;.usage&#39; field filled out<br />Debug: 144 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf5&#39;...<br />Debug: 145 7 command.c:323 command_new(): BUG: command &#39;nrf51 mass_erase&#39; does not have the &#39;.usage&#39; field filled out<br />Debug: 146 7 command.c:364 register_command_handler(): registering &#39;ocd_nrf51&#39;...<br />Debug: 147 7 tcl.c:1146 handle_flash_bank_command(): &#39;nrf5&#39; driver usage field missing<br />Debug: 148 7 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_flash bank nrf52.uicr nrf5 0x10001000 0 1 1 nrf52.cpu<br />Debug: 149 7 command.c:143 script_debug(): command - ocd_flash ocd_flash bank nrf52.uicr nrf5 0x10001000 0 1 1 nrf52.cpu<br />Debug: 151 7 command.c:399 register_command(): command &#39;nrf5&#39; is already registered in &#39;&lt;global&gt;&#39; context<br />Debug: 152 7 command.c:399 register_command(): command &#39;mass_erase&#39; is already registered in &#39;nrf5&#39; context<br />Debug: 153 7 command.c:399 register_command(): command &#39;nrf51&#39; is already registered in &#39;&lt;global&gt;&#39; context<br />Debug: 154 7 command.c:399 register_command(): command &#39;mass_erase&#39; is already registered in &#39;nrf51&#39; context<br />Debug: 155 7 tcl.c:1146 handle_flash_bank_command(): &#39;nrf5&#39; driver usage field missing<br />Info : 156 8 server.c:307 add_service(): Listening on port 6666 for tcl connections<br />Info : 157 8 server.c:307 add_service(): Listening on port 4444 for telnet connections<br />Debug: 158 8 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_init<br />Debug: 159 8 command.c:143 script_debug(): command - init ocd_init<br />Debug: 161 8 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_target init<br />Debug: 162 8 command.c:143 script_debug(): command - ocd_target ocd_target init<br />Debug: 164 8 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_target names<br />Debug: 165 8 command.c:143 script_debug(): command - ocd_target ocd_target names<br />Debug: 166 8 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_nrf52.cpu cget -event gdb-flash-erase-start<br />Debug: 167 8 command.c:143 script_debug(): command - ocd_nrf52.cpu ocd_nrf52.cpu cget -event gdb-flash-erase-start<br />Debug: 168 8 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_nrf52.cpu configure -event gdb-flash-erase-start reset init<br />Debug: 169 8 command.c:143 script_debug(): command - ocd_nrf52.cpu ocd_nrf52.cpu configure -event gdb-flash-erase-start reset init<br />Debug: 170 8 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_nrf52.cpu cget -event gdb-flash-write-end<br />Debug: 171 8 command.c:143 script_debug(): command - ocd_nrf52.cpu ocd_nrf52.cpu cget -event gdb-flash-write-end<br />Debug: 172 8 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_nrf52.cpu configure -event gdb-flash-write-end reset halt<br />Debug: 173 8 command.c:143 script_debug(): command - ocd_nrf52.cpu ocd_nrf52.cpu configure -event gdb-flash-write-end reset halt<br />Debug: 174 8 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_nrf52.cpu cget -event gdb-attach<br />Debug: 175 8 command.c:143 script_debug(): command - ocd_nrf52.cpu ocd_nrf52.cpu cget -event gdb-attach<br />Debug: 176 8 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_nrf52.cpu configure -event gdb-attach halt<br />Debug: 177 8 command.c:143 script_debug(): command - ocd_nrf52.cpu ocd_nrf52.cpu configure -event gdb-attach halt<br />Debug: 178 8 target.c:1362 handle_target_init_command(): Initializing targets...<br />Debug: 179 8 hla_target.c:357 adapter_init_target(): adapter_init_target<br />Debug: 180 8 semihosting_common.c:97 semihosting_common_init(): <br />Debug: 181 8 command.c:364 register_command_handler(): registering &#39;ocd_target_request&#39;...<br />Debug: 182 8 command.c:364 register_command_handler(): registering &#39;ocd_trace&#39;...<br />Debug: 183 8 command.c:364 register_command_handler(): registering &#39;ocd_trace&#39;...<br />Debug: 184 8 command.c:364 register_command_handler(): registering &#39;ocd_fast_load_image&#39;...<br />Debug: 185 8 command.c:364 register_command_handler(): registering &#39;ocd_fast_load&#39;...<br />Debug: 186 8 command.c:364 register_command_handler(): registering &#39;ocd_profile&#39;...<br />Debug: 187 8 command.c:364 register_command_handler(): registering &#39;ocd_virt2phys&#39;...<br />Debug: 188 9 command.c:364 register_command_handler(): registering &#39;ocd_reg&#39;...<br />Debug: 189 9 command.c:364 register_command_handler(): registering &#39;ocd_poll&#39;...<br />Debug: 190 9 command.c:364 register_command_handler(): registering &#39;ocd_wait_halt&#39;...<br />Debug: 191 9 command.c:364 register_command_handler(): registering &#39;ocd_halt&#39;...<br />Debug: 192 9 command.c:364 register_command_handler(): registering &#39;ocd_resume&#39;...<br />Debug: 193 9 command.c:364 register_command_handler(): registering &#39;ocd_reset&#39;...<br />Debug: 194 9 command.c:364 register_command_handler(): registering &#39;ocd_soft_reset_halt&#39;...<br />Debug: 195 9 command.c:364 register_command_handler(): registering &#39;ocd_step&#39;...<br />Debug: 196 9 command.c:364 register_command_handler(): registering &#39;ocd_mdd&#39;...<br />Debug: 197 9 command.c:364 register_command_handler(): registering &#39;ocd_mdw&#39;...<br />Debug: 198 9 command.c:364 register_command_handler(): registering &#39;ocd_mdh&#39;...<br />Debug: 199 9 command.c:364 register_command_handler(): registering &#39;ocd_mdb&#39;...<br />Debug: 200 9 command.c:364 register_command_handler(): registering &#39;ocd_mwd&#39;...<br />Debug: 201 9 command.c:364 register_command_handler(): registering &#39;ocd_mww&#39;...<br />Debug: 202 9 command.c:364 register_command_handler(): registering &#39;ocd_mwh&#39;...<br />Debug: 203 9 command.c:364 register_command_handler(): registering &#39;ocd_mwb&#39;...<br />Debug: 204 9 command.c:364 register_command_handler(): registering &#39;ocd_bp&#39;...<br />Debug: 205 9 command.c:364 register_command_handler(): registering &#39;ocd_rbp&#39;...<br />Debug: 206 9 command.c:364 register_command_handler(): registering &#39;ocd_wp&#39;...<br />Debug: 207 9 command.c:364 register_command_handler(): registering &#39;ocd_rwp&#39;...<br />Debug: 208 9 command.c:364 register_command_handler(): registering &#39;ocd_load_image&#39;...<br />Debug: 209 9 command.c:364 register_command_handler(): registering &#39;ocd_dump_image&#39;...<br />Debug: 210 9 command.c:364 register_command_handler(): registering &#39;ocd_verify_image_checksum&#39;...<br />Debug: 211 9 command.c:364 register_command_handler(): registering &#39;ocd_verify_image&#39;...<br />Debug: 212 9 command.c:364 register_command_handler(): registering &#39;ocd_test_image&#39;...<br />Debug: 213 9 command.c:364 register_command_handler(): registering &#39;ocd_reset_nag&#39;...<br />Debug: 214 9 command.c:364 register_command_handler(): registering &#39;ocd_ps&#39;...<br />Debug: 215 9 command.c:364 register_command_handler(): registering &#39;ocd_test_mem_access&#39;...<br />Debug: 216 9 hla_interface.c:109 hl_interface_init(): hl_interface_init<br />Debug: 217 9 hla_layout.c:83 hl_layout_init(): hl_layout_init<br />Debug: 218 9 core.c:1612 adapter_khz_to_speed(): convert khz to interface specific speed value<br />Debug: 219 9 core.c:1615 adapter_khz_to_speed(): have interface set up<br />Info : 220 9 stlink_usb.c:1941 stlink_speed(): Unable to match requested speed 1000 kHz, using 950 kHz<br />Debug: 221 9 core.c:1612 adapter_khz_to_speed(): convert khz to interface specific speed value<br />Debug: 222 9 core.c:1615 adapter_khz_to_speed(): have interface set up<br />Info : 223 9 stlink_usb.c:1941 stlink_speed(): Unable to match requested speed 1000 kHz, using 950 kHz<br />Info : 224 9 core.c:1394 adapter_init(): clock speed 950 kHz<br />Debug: 225 9 openocd.c:142 handle_init_command(): Debug Adapter init complete<br />Debug: 226 10 command.c:143 script_debug(): command - ocd_command ocd_command type ocd_transport init<br />Debug: 227 10 command.c:143 script_debug(): command - ocd_transport ocd_transport init<br />Debug: 229 10 transport.c:239 handle_transport_init(): handle_transport_init<br />Debug: 230 10 hla_transport.c:152 hl_transport_init(): hl_transport_init<br />Debug: 231 10 hla_transport.c:169 hl_transport_init(): current transport hla_swd<br />Debug: 232 10 hla_interface.c:42 hl_interface_open(): hl_interface_open<br />Debug: 233 10 hla_layout.c:40 hl_layout_open(): hl_layout_open<br />Debug: 234 10 stlink_usb.c:2010 stlink_usb_open(): stlink_usb_open<br />Debug: 235 10 stlink_usb.c:2024 stlink_usb_open(): transport: 1 vid: 0x0483 pid: 0x3744 serial: <br />Debug: 236 10 stlink_usb.c:2024 stlink_usb_open(): transport: 1 vid: 0x0483 pid: 0x3748 serial: <br />Debug: 237 10 stlink_usb.c:2024 stlink_usb_open(): transport: 1 vid: 0x0483 pid: 0x374b serial: <br />Info : 238 15 stlink_usb.c:641 stlink_usb_version(): STLINK v2 JTAG v17 API v2 SWIM v4 VID 0x0483 PID 0x3748<br />Info : 239 15 stlink_usb.c:2136 stlink_usb_open(): using stlink api v2<br />Debug: 240 15 stlink_usb.c:842 stlink_usb_init_mode(): MODE: 0x01<br />Info : 241 15 stlink_usb.c:673 stlink_usb_check_voltage(): Target voltage: 3.545346<br />Debug: 242 15 stlink_usb.c:897 stlink_usb_init_mode(): MODE: 0x01<br />Debug: 243 16 stlink_usb.c:495 stlink_usb_error_check(): unknown/unexpected STLINK status code 0x9<br />Error: 244 16 stlink_usb.c:2145 stlink_usb_open(): init mode failed (unable to connect to the target)<br />Debug: 245 16 hla_layout.c:47 hl_layout_open(): failed<br />Debug: 246 16 command.c:642 run_command(): Command failed with error code -4<br />User : 247 16 command.c:705 command_run_line(): in procedure &#39;init&#39; <br />in procedure &#39;ocd_bouncer&#39;<br />Debug: 248 16 command.c:642 run_command(): Command failed with error code -4<br />User : 249 16 command.c:705 command_run_line(): <br />Debug: 250 16 target.c:1971 target_free_all_working_areas_restore(): freeing all working areas<br />Warn : 251 16 core.c:189 flash_free_all_banks(): Flash driver of nrf52.flash does not support free_driver_priv()<br />Warn : 252 16 core.c:189 flash_free_all_banks(): Flash driver of nrf52.uicr does not support free_driver_priv()<br />Debug: 253 16 hla_interface.c:117 hl_interface_quit(): hl_interface_quit</p> <p>=&gt; This mean the STLink connection should be the problem.&nbsp;</p><div style="clear:both;"></div>