成功的时候是这样子：
Open On-Chip Debugger 0.10.0+dev-00021-g524e8c8 (2019-04-12-08:48)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
none separate
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
adapter speed: 8000 kHz
adapter_nsrst_delay: 100
Info : clock speed 8000 kHz
Info : STLINK v2.1 JTAG v31 API v2 M21 VID 0x0483 PID 0x374B
Info : using stlink api v2
Info : Target voltage: 3.255010
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
Info : Stlink adapter speed set to 4000 kHz
Info : STM32F030C8Tx.cpu: hardware has 4 breakpoints, 2 watchpoints
Info : Listening on port 3333 for gdb connections
target halted due to debug-request, current mode: Thread
xPSR: 0xc1000000 pc: 0x08001a34 msp: 0x20002000
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
Info : Stlink adapter speed set to 4000 kHz
Info : Unable to match requested speed 8000 kHz, using 4000 kHz
adapter speed: 4000 kHz
** Programming Started **
auto erase enabled
Info : device id = 0x20006440
Info : flash size = 64kbytes
target halted due to breakpoint, current mode: Thread
xPSR: 0x61000000 pc: 0x2000003a msp: 0x20002000
wrote 7168 bytes from file Debug/lnxlastchance.elf in 0.416740s (16.797 KiB/s)
** Programming Finished **
** Verify Started **
target halted due to breakpoint, current mode: Thread
xPSR: 0x61000000 pc: 0x2000002e msp: 0x20002000
verified 6980 bytes in 0.052969s (128.687 KiB/s)
** Verified OK **
** Resetting Target **
shutdown command invoked
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