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Jlink

zhinkgit/embeddedskills
169 installs314 stars
Summary

If you're working with J-Link probes and need to flash firmware, read RTT logs, or debug ARM targets without leaving your editor, this handles the full workflow. It wraps JLink.exe, JLinkGDBServerCL, and arm-none-eabi-gdb into a unified interface with JSON output. You can halt execution, step through instructions, set breakpoints by address, or drop into source-level GDB sessions when you have an ELF file. The config setup is two-tier: tool paths live in the skill directory, device parameters (chip model, SWD vs JTAG, speed) live in your workspace. It won't guess your chip type or auto-select probes, which is the right call when a wrong guess bricks something.

Install to Claude Code

npx -y skills add zhinkgit/embeddedskills --skill jlink --agent claude-code

Installs into .claude/skills of the current project.

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Files
SKILL.mdView on GitHub

J-Link 下载与在线调试

本 skill 提供 J-Link 探针的设备探测、固件烧录、内存读写、寄存器查看、目标复位、RTT 日志读取,以及轻量在线调试和 GDB 源码级调试能力。

配置

环境级配置(skill/config.json)

skill 目录下的 config.json 包含环境级配置(工具路径、端口号等),首次使用前确认 exe 路径正确:

{
  "exe": "C:\\Program Files\\SEGGER\\JLink\\JLink.exe",
  "gdbserver_exe": "C:\\Program Files\\SEGGER\\JLink\\JLinkGDBServerCL.exe",
  "rtt_exe": "C:\\Program Files\\SEGGER\\JLink\\JLinkRTTClient.exe",
  "gdb_exe": "C:\\Program Files\\Arm\\GNU Toolchain mingw-w64-x86_64-arm-none-eabi\\bin\\arm-none-eabi-gdb.exe",
  "serial_no": "",
  "rtt_telnet_port": 0,
  "swo_command": [],
  "operation_mode": 1
}
  • exe:JLink.exe 完整路径(必填)
  • gdbserver_exe:JLinkGDBServerCL.exe 路径,RTT 和 GDB 调试需要
  • rtt_exe:JLinkRTTClient.exe 路径
  • gdb_exe:arm-none-eabi-gdb 路径,GDB 源码级调试需要
  • serial_no:默认探针序列号,多探针场景下使用
  • rtt_telnet_port:RTT 端口,0 表示使用工具默认值
  • swo_command:可选,完整 SWO viewer 命令数组,供 jlink_swo.py 包装
  • operation_mode:1 直接执行 / 2 输出风险摘要但不阻塞 / 3 执行前确认

工程级配置(.embeddedskills/config.json)

设备参数(device/interface/speed)统一在工作区的 .embeddedskills/config.json 中管理:

{
  "jlink": {
    "device": "STM32F407VG",
    "interface": "SWD",
    "speed": "4000"
  }
}
  • device:芯片型号(如 STM32F407VG、GD32F470ZG)
  • interface:调试接口,SWD 或 JTAG,默认 SWD
  • speed:调试速率 kHz,默认 4000

参数解析优先级:CLI 显式参数 > .embeddedskills/config.json(工程级)> skill/config.json(环境级)> .embeddedskills/state.json > 默认值/报错

成功执行后,确认过的 device/interface/speed 会自动写回工程配置。

子命令

基础操作

子命令用途风险
info探测探针与目标连通性低
flash烧录固件(.hex / .bin / .elf)高
read-mem读取内存区域低
write-mem写入内存高
regs查看 CPU 寄存器低
reset复位目标芯片高
rtt读取 RTT 日志输出低
swo包装外部 SWO viewer 为统一事件流低

在线调试(JLink Commander)

子命令用途风险
halt暂停 CPU,返回寄存器状态低
go恢复 CPU 运行低
step单步执行(支持指定步数),返回执行的指令和寄存器低
run-to设置断点并运行,等待命中后返回状态低

GDB 源码级调试

子命令用途依赖
gdb backtrace/locals查看调用栈和局部变量arm-none-eabi-gdb
gdb break/continue/next/step/finish/untilone-shot 控制执行流arm-none-eabi-gdb
gdb frame/print/watch/disassemble/threads/crash-reportone-shot 源码级诊断arm-none-eabi-gdb

执行流程

  1. 读取 skill/config.json,确认 exe 路径有效
  2. 读取 .embeddedskills/config.json 获取工程级配置(device/interface/speed)
  3. 读取 .embeddedskills/state.json 获取历史状态
  4. 参数解析优先级:CLI 显式参数 > .embeddedskills/config.json(工程级)> skill/config.json(环境级)> .embeddedskills/state.json > 默认值/报错
  5. 若当前动作需要 device 且仍为空,直接要求用户补充,绝不猜测
  6. 多探针场景未指定 serial_no 时,列出探针让用户选择,不自动选择
  7. 按 operation_mode 决定是否需要确认后执行
  8. 使用模板生成临时 .jlink 命令文件,调用 JLink.exe 时带 -NoGui 1 -ExitOnError 1 -AutoConnect 1
  9. 解析输出和返回码,返回结构化结果
  10. 成功执行后,将确认过的 device/interface/speed 写回 .embeddedskills/config.json

脚本调用

skill 目录下有四个 Python 脚本,使用标准库实现,无额外依赖。

jlink_exec.py — 基础操作 + 轻量调试

# 探测连通性
python <skill-dir>/scripts/jlink_exec.py info --device GD32F470ZG --json

# 烧录固件
python <skill-dir>/scripts/jlink_exec.py flash --file build/app.hex --device GD32F470ZG --json

# 烧录 .bin(必须提供地址)
python <skill-dir>/scripts/jlink_exec.py flash --file build/app.bin --device GD32F470ZG --address 0x08000000 --json

# 读取内存
python <skill-dir>/scripts/jlink_exec.py read-mem --address 0x08000000 --length 256 --device GD32F470ZG --json

# 写入内存
python <skill-dir>/scripts/jlink_exec.py write-mem --address 0x20000000 --value 0x12345678 --device GD32F470ZG --json

# 查看寄存器
python <skill-dir>/scripts/jlink_exec.py regs --device GD32F470ZG --json

# 复位目标
python <skill-dir>/scripts/jlink_exec.py reset --device GD32F470ZG --json

# 暂停 CPU
python <skill-dir>/scripts/jlink_exec.py halt --device GD32F470ZG --json

# 恢复运行
python <skill-dir>/scripts/jlink_exec.py go --device GD32F470ZG --json

# 单步执行(3 步)
python <skill-dir>/scripts/jlink_exec.py step --device GD32F470ZG --count 3 --json

# 运行到断点地址
python <skill-dir>/scripts/jlink_exec.py run-to --device GD32F470ZG --address 0x08001234 --timeout-ms 3000 --json

通用可选参数:--interface SWD|JTAG、--speed 4000、--serial-no <序列号>、--exe <JLink.exe路径>

jlink_rtt.py — RTT 日志读取

python <skill-dir>/scripts/jlink_rtt.py --device GD32F470ZG --json

可选参数:--serial-no、--channel、--encoding、--rtt-port、--gdbserver-exe <路径>、--rtt-exe <路径>

RTT 工作原理:脚本先通过 JLinkGDBServerCL.exe 建立调试连接,再启动 JLinkRTTClient.exe 读取 RTT 数据。--json 模式输出 JSON Lines。

jlink_swo.py — SWO 事件流包装

# 使用 config.json 里的 swo_command
python <skill-dir>/scripts/jlink_swo.py --json

# 或显式传入 viewer 命令
python <skill-dir>/scripts/jlink_swo.py \
  --viewer-cmd JLinkSWOViewerCL.exe -device GD32F470ZG -itf SWD -speed 4000 \
  --json

jlink_swo.py 不直接实现 SWO 协议,而是把外部 viewer 的 stdout/stderr 统一包装成 JSON Lines,便于上层 workflow 或 AI 继续消费。

jlink_gdb.py — GDB 源码级调试(需要 arm-none-eabi-gdb)

# 执行自定义 GDB 命令序列
python <skill-dir>/scripts/jlink_gdb.py run \
  --gdbserver-exe <路径> --gdb-exe <arm-none-eabi-gdb路径> \
  --device GD32F470ZG --elf build/app.elf \
  --commands "break main" "continue" "backtrace" "info locals" --json

# 快捷:获取调用栈
python <skill-dir>/scripts/jlink_gdb.py backtrace \
  --gdbserver-exe <路径> --gdb-exe <路径> \
  --device GD32F470ZG --elf build/app.elf --json

# 快捷:查看局部变量
python <skill-dir>/scripts/jlink_gdb.py locals \
  --gdbserver-exe <路径> --gdb-exe <路径> \
  --device GD32F470ZG --elf build/app.elf --json

GDB 调试需要 ELF 文件才能进行源码级调试(断点到函数名、查看变量)。没有 ELF 时仍可使用地址级调试。

输出格式

所有脚本以 JSON 格式返回,基础字段为 status(ok/error)、action、summary、details,并可能附带 context、artifacts、metrics、state、next_actions、timing。流式观测命令使用 JSON Lines,并统一输出 source、channel_type、stream_type。

成功示例:

{
  "status": "ok",
  "action": "halt",
  "summary": "已暂停,PC=0x08049ABC",
  "details": {
    "device": "GD32F470ZG",
    "registers": { "PC": "0x08049ABC", "R0": "0x00000004", "..." : "..." }
  }
}

step 示例(包含执行的指令):

{
  "status": "ok",
  "action": "step",
  "summary": "单步3次,PC=0x08049AB4",
  "details": {
    "steps": [
      { "address": "0x08049AB8", "opcode": "80 1B", "instruction": "SUBS R0, R0, R6" },
      { "address": "0x08049ABA", "opcode": "A8 42", "instruction": "CMP R0, R5" },
      { "address": "0x08049ABC", "opcode": "FA D3", "instruction": "BCC #-0x0C" }
    ],
    "registers": { "PC": "0x08049AB4", "..." : "..." }
  }
}

run-to 示例(断点命中):

{
  "status": "ok",
  "action": "run-to",
  "summary": "断点命中 @ 0x08049AB4,PC=0x08049AB4",
  "details": {
    "bp_address": "0x08049AB4",
    "bp_hit": true,
    "registers": { "PC": "0x08049AB4", "..." : "..." }
  }
}

核心规则

  • 不自动猜测 device 芯片型号,缺失时必须询问用户
  • 多探针场景不自动选择探针,必须让用户指定序列号
  • 参数解析优先级为:CLI 显式参数 > .embeddedskills/config.json(工程级)> skill/config.json(环境级)> .embeddedskills/state.json > 默认值/报错
  • .bin 文件必须显式提供烧录地址,缺失时报错
  • 连接失败时给出排查建议(检查连线、供电、接口类型、速度),不自动尝试更激进参数
  • 烧录、写内存、复位在参数完整且用户意图明确时直接执行
  • run-to 的断点在单次 JLink 会话内完成设置和清除,不存在跨会话 handle 问题
  • 结果回显中始终包含目标芯片、接口类型和执行动作
  • 产物路径(elf/file)不进入工程配置,仍只依赖 state.json
  • last_flash/last_debug 等运行状态继续写入 state.json

调试典型工作流

快速排查(JLink Commander)

halt → regs → read-mem → step → go

适合查看当前执行位置、寄存器状态、内存值,无需 ELF 和 GDB。

断点调试(JLink Commander)

run-to(address) → regs → read-mem → go

在指定地址设置断点并等待命中,查看此时的状态。

源码级调试(GDB)

gdb run --elf app.elf --commands "break main" "continue" "backtrace" "info locals"

需要 ELF 文件和 arm-none-eabi-gdb,支持函数名断点和变量查看。

参考

遇到芯片型号问题时可查阅 references/common_devices.md。

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First SeenJun 3, 2026
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