2026-05-13 10:58 PM - last edited on 2026-05-14 12:56 AM by Andrew Neil
Kindly help me with this. Im using a STM32 blue PILL - stm32F103C8
Open On-Chip Debugger 0.12.0+dev-00608-gd8ed48fef (2025-02-06-11:17) [https://github.com/STMicroelectronics/OpenOCD]
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : STLINK V2J46S7 (API v2) VID:PID 0483:3748
Info : Target voltage: 3.215873
Info : clock speed 4000 kHz
Info : stlink_dap_op_connect(connect)
Info : SWD DPIDR 0x1ba01477
Info : [STM32F103C8Tx.cpu] Cortex-M3 r1p1 processor detected
Info : [STM32F103C8Tx.cpu] target has 6 breakpoints, 4 watchpoints
Info : [STM32F103C8Tx.cpu] Examination succeed
Info : starting gdb server for STM32F103C8Tx.cpu on 3333
Info : Listening on port 3333 for gdb connections
Info : accepting 'gdb' connection on tcp/3333
Info : device id = 0x20036410
Info : flash size = 64 KiB
Warn : GDB connection 1 on target STM32F103C8Tx.cpu not halted
undefined debug reason 8 (UNDEFINED) - target needs reset
Info : accepting 'gdb' connection on tcp/3333
Warn : GDB connection 2 on target STM32F103C8Tx.cpu not halted
undefined debug reason 8 (UNDEFINED) - target needs reset
[STM32F103C8Tx.cpu] halted due to breakpoint, current mode: Thread
xPSR: 0x01000000 pc: 0x08000384 msp: 0x20005000
[STM32F103C8Tx.cpu] halted due to breakpoint, current mode: Thread
xPSR: 0x01000000 pc: 0x08000384 msp: 0x20005000
Info : dropped 'gdb' connection
[STM32F103C8Tx.cpu] halted due to debug-request, current mode: Thread
xPSR: 0x21000000 pc: 0x080004c8 msp: 0x20004fe0
shutdown command invoked
Info : dropped 'gdb' connection
Im a beginner, Kindly pardon my lack of understanding. Please suggest
2026-05-14 12:45 AM - edited 2026-05-14 1:35 AM
Welcome to the forum.
Please see How to write your question to maximize your chances to find a solution for best results - in particular, what other tools, etc, are you using?
Note that Blue Pill is not an ST Product, and most likely contains a fake/clone microcontroller.
Therefore, you most likely will face problems when trying to use it with ST tools - that's a given !
eg, see this; and a forum search for "Blue Pill" will bring up many more such examples.
For a genuine, supported device try a Nucleo-F103RB - note that this comes complete with a genuine ST-Link.
PS:
Here is a diagnostic utility to identify what is actually fitted on your board.
#BluePill #FakeSTM32F103