I am encountering an issue while attempting to debug my STM32F429 microcontroller using STM32CubeIDE (version 1.18.0) with the ST-LINK V2 debugger. The console outputted the following message:
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Info : Listening on port 7777 for tcl connections
Info : Listening on port 5555 for telnet connections
Info : STLINK V2J46S7 (API v2) VID:PID 0483:3748
Info : Target voltage: 2.935230
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
Info : clock speed 4000 kHz
Info : stlink_dap_op_connect(connect)
Info : SWD DPIDR 0x2ba01477
Info : [STM32F429ZITx.cpu] Cortex-M4 r0p1 processor detected
Info : [STM32F429ZITx.cpu] target has 6 breakpoints, 4 watchpoints
Info : [STM32F429ZITx.cpu] Examination succeed
Info : starting gdb server for STM32F429ZITx.cpu on 4444
Info : Listening on port 4444 for gdb connections
Info : accepting 'gdb' connection on tcp/4444
Error: timed out while waiting for target halted
Error executing event gdb-attach on target STM32F429ZITx.cpu:
C:/ST/STM32CubeIDE_1.18.0/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.debug.openocd_2.3.100.202501240831/resources/openocd/st_scripts/gdb_helper.tcl:18: Error: TARGET: STM32F429ZITx.cpu - Not halted
in procedure 'gdb_attach_hook' called at file "C:/ST/STM32CubeIDE_1.18.0/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.debug.openocd_2.3.100.202501240831/resources/openocd/st_scripts/target/stm32f4x.cfg", line 192
in procedure 'first_gdb_attach_hook' called at file "C:/ST/STM32CubeIDE_1.18.0/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.debug.openocd_2.3.100.202501240831/resources/openocd/st_scripts/gdb_helper.tcl", line 18
Info : device id = 0x20036419
Info : flash size = 2048 KiB
Info : Dual Bank 2048 kiB STM32F42x/43x/469/479 found
Warn : GDB connection 1 on target STM32F429ZITx.cpu not halted
undefined debug reason 8 (UNDEFINED) - target needs reset
Info : accepting 'gdb' connection on tcp/4444
Warn : GDB connection 2 on target STM32F429ZITx.cpu not halted
undefined debug reason 8 (UNDEFINED) - target needs reset
Error: timed out while waiting for target halted
Error executing event gdb-flash-erase-start on target STM32F429ZITx.cpu:
TARGET: STM32F429ZITx.cpu - Not halted
Error: Target not halted
Error: failed erasing sectors 0 to 0
Error: flash_erase returned -304
Info : dropped 'gdb' connection
shutdown command invoked
Info : dropped 'gdb' connection
