OpenOCD调试AT32F421记录

自己做的AT32F421最小系统，在OpenOCD下用FT2232H系列的Adapter烧录时总是报错：

• 使用 program 指令时报错 

  embedded:startup.tcl:1194: Error: ** Unable to reset target **
  in procedure 'program'
  in procedure 'program_error' called at file "embedded:startup.tcl", line 1231
  at file "embedded:startup.tcl", line 1194
  SWD DPIDR 0x2ba01477

• 使用 flash write_image 时报错

  >This is target at32f421xx algorithm
  >flash size: 0x10000 byte
  >flash sector num : 0x40
  >flash sector size : 0x400
  >flash bank size : 0x10000
  >at32f421xx
  Write offset: 0x0
  Write count: 0xaa4
  SWD DPIDR 0x2ba01477
  Error setting register xPSR
  SWD DPIDR 0x2ba01477
  Error setting register pc
  SWD DPIDR 0x2ba01477
  Error setting register r4
  SWD DPIDR 0x2ba01477
  Error setting register r3
  SWD DPIDR 0x2ba01477
  Error setting register r2
  SWD DPIDR 0x2ba01477
  Error setting register r1
  SWD DPIDR 0x2ba01477
  Error setting register r0
  SWD DPIDR 0x2ba01477
  timeout waiting for algorithm, a target reset is recommended
  flash write failed at address 0x8000000
  error writing to flash at address 0x08000000 at offset 0x00000000
  embedded:startup.tcl:1194: Error:
  in procedure 'program'
  in procedure 'program_error' called at file "embedded:startup.tcl", line 1231
  at file "embedded:startup.tcl", line 1194
  Polling target at32f421xx.cpu failed, trying to reexamine

遂开始逐个排查问题。

检查过程

1. 检查原理图，PCB，硬件连接；

2. 检查寄存器。

。。。

结论

可能是AT官方在github上开源的OpenOCD的branch代码本身问题。

AT官方的另一个OpenOCD的xpack发行版（截止当前的最新版是v2.0.2）则没有问题。但是这个版本阉割了一些功能（不能使用FT2232系列的Adapter，而这正是本人需要的。）

下面是运行openocd.exe的结果：

1. OpenOCD master 发行版：

   Open On-Chip Debugger 0.11.0 (2021-06-25) [https://github.com/sysprogs/openocd]
   Licensed under GNU GPL v2
   libusb1 09e75e98b4d9ea7909e8837b7a3f00dda4589dc3
   For bug reports, read
           http://openocd.org/doc/doxygen/bugs.html
   embedded:startup.tcl:26: Error: Can't find openocd.cfg
   in procedure 'script'
   at file "embedded:startup.tcl", line 26
   Info : Listening on port 6666 for tcl connections
   Info : Listening on port 4444 for telnet connections
   Error: Debug Adapter has to be specified, see "adapter driver" command
   embedded:startup.tcl:26: Error:
   in procedure 'script'
   at file "embedded:startup.tcl", line 26

2. 自己使用Mingw64编译的适配FT器件的AT官方openocd branch：

   Open On-Chip Debugger 0.11.0+dev-00781-gbbdd75e08 (2022-08-21-22:47)
   Licensed under GNU GPL v2
   For bug reports, read
           http://openocd.org/doc/doxygen/bugs.html
   embedded:startup.tcl:28: Error: Can't find openocd.cfg
   in procedure 'script'
   at file "embedded:startup.tcl", line 28
   Info : Listening on port 6666 for tcl connections
   Info : Listening on port 4444 for telnet connections
   Error: Debug Adapter has to be specified, see "adapter driver" command
   embedded:startup.tcl:28: Error:
   in procedure 'script'
   at file "embedded:startup.tcl", line 28

3. AT官方使用xpack编译的仅适配JLink和CMSIS Dap的openocd：

   Open On-Chip Debugger 0.11.0+dev-snapshot (2022-05-19-16:31)
   Licensed under GNU GPL v2
   For bug reports, read
           http://openocd.org/doc/doxygen/bugs.html
   embedded:startup.tcl:26: Error: Can't find openocd.cfg
   in procedure 'script'
   at file "embedded:startup.tcl", line 26
   Info : Listening on port 6666 for tcl connections
   Info : Listening on port 4444 for telnet connections
   Error: Debug Adapter has to be specified, see "adapter driver" command
   embedded:startup.tcl:26: Error:
   in procedure 'script'
   at file "embedded:startup.tcl", line 26

 解决办法

最终无奈，在不习惯用keil和iar的情况下只好弄了一只ATLink，用官方编译好的OpenOCD去调试了。具体见另一篇文章。