使用openocd遇到的一个问题的解决

PS D:\openocd> .\openocd.exe -f .\interface\jlink.cfg -f .\target\stm32f4x.cfg
Open On-Chip Debugger 0.10.0
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
Info : auto-selecting first available session transport "jtag". To override use 'transport select <transport>'.
adapter speed: 2000 kHz
adapter_nsrst_delay: 100
jtag_ntrst_delay: 100
none separate
cortex_m reset_config sysresetreq
Info : No device selected, using first device.
Info : J-Link V9 compiled Feb  2 2021 16:34:10
Info : Hardware version: 9.50
Info : VTarget = 3.325 V
Info : clock speed 2000 kHz
Error: JTAG scan chain interrogation failed: all zeroes
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: stm32f4x.cpu: IR capture error; saw 0x00 not 0x01
Warn : Bypassing JTAG setup events due to errors
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Invalid ACK (0) in DAP response
Error: Could not initialize the debug port

连接的设备平台是不支持jtag的，请检查自己设备的设置，是否使用的jtag的transport协议。
解决方法很简单。openocd命令在没有指定的情况下默认会选择jtag协议。如果自己的设备使用了swd协议。需要单独指定。cp一份openocd的interface/XX.cfg文件，比如我使用的是j-link，我cp一份jlink.cfg并命名为jlnk-swd.cfg，文本内容如下
interface jlink
transport select swd

注：openocd支持的transport可以使用命令查看
openocd -c 'transport list'

PS D:\openocd> .\openocd.exe -f .\interface\jlink_swd.cfg -f .\target\stm32f4x.cfg
Open On-Chip Debugger 0.10.0
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
swd
adapter speed: 2000 kHz
adapter_nsrst_delay: 100
none separate
cortex_m reset_config sysresetreq
Info : No device selected, using first device.
Info : J-Link V9 compiled Feb  2 2021 16:34:10
Info : Hardware version: 9.50
Info : VTarget = 3.325 V
Info : clock speed 2000 kHz
Info : SWD DPIDR 0x2ba01477
Info : stm32f4x.cpu: hardware has 6 breakpoints, 4 watchpoints