pydsview 0.1.7

Python bindings for DSView's libsigrok4DSL — control DreamSourceLab logic analyzers and oscilloscopes

pydsview

English | 中文

---

English

Python bindings for DSView's libsigrok4DSL — control DreamSourceLab logic analyzers and oscilloscopes (DSLogic, DSCope) from Python.

Installation

pip install pydsview

Features

• Discover and activate DSLogic/DSCope/Demo devices
• Configure samplerate, sample count, channels, triggers
• Synchronous and asynchronous capture
• NumPy array output
• Export to CSV (with compressed mode), VCD, and DSView session (.dsl) format
• Prebuilt Windows DLLs and firmware included — plug and play

Architecture

Python user code
    └── pydsview (Python package)
            ├── DSContext  — library lifecycle, device list
            ├── Device     — config, channels, capture
            ├── Capture    — sync/async data collection
            ├── Trigger    — trigger configuration
            └── Exporter   — CSV / VCD / session export
                    └── _binding.py (cffi ABI-mode)
                            └── libsigrok4dsl.dll/.so + shim.c
                                    └── libusb / glib / zlib

Quick Start (Windows)

Prebuilt DLLs and firmware are bundled. Just install and use:

pip install pydsview

For development:

git clone https://github.com/fankai777/pydsview.git
cd pydsview
pip install -e ".[dev]"

import pydsview

with pydsview.DSContext() as ctx:
    for info in ctx.list_devices():
        print(info.name, info.handle)

    dev = ctx.get_device(1)                        # DSLogic Plus
    dev.set_config(pydsview.Config.OPERATION_MODE, 1)  # stream mode
    dev.set_config(pydsview.Config.VTH, 1.0)           # threshold 1.0V
    dev.samplerate = pydsview.SR_MHZ(1)
    dev.sample_count = 1_000_000

    result = dev.capture(timeout=10.0)

    # NumPy data
    data = result.to_numpy()
    ch0 = result.channel_data(0)   # bool array

    # Export (compressed CSV — only writes rows where values change)
    pydsview.export.Exporter.to_csv(result, "data.csv")
    pydsview.export.Exporter.to_vcd(result, "data.vcd")

Building from Source (Linux / rebuild DLL)

If you need to rebuild the native library:

cd pydsview/csrc
mkdir build && cd build
cmake .. -G "MinGW Makefiles"   # Windows (MSYS2 mingw64)
# cmake .. -G "Unix Makefiles"  # Linux
cmake --build .
cmake --install .               # copies DLL/SO into pydsview/_libs/

Build dependencies (same as DSView):

• glib-2.0 (via pkg-config)
• libusb-1.0
• zlib
• pthreads

API Reference

DSContext(firmware_dir=None, user_data_dir=None)

Initialize the library. Use as a context manager. Firmware is bundled in pydsview/res/ and loaded automatically.

• list_devices() → list[DeviceInfo]
• get_device(index) → Device
• load_session_file(path) → Device
• lib_version → str

Device

Wraps the currently active device.

• name, mode, device_type, channels
• samplerate (get/set), sample_count (get/set)
• get_config(key), set_config(key, value)
• enable_channel(index, enabled), set_channel_name(index, name)
• capture(timeout=None) → CaptureResult (synchronous)
• start_capture() → CaptureSession (asynchronous)

CaptureResult

• to_numpy() → np.ndarray
• to_channel_arrays() → list[np.ndarray] (per-channel bool arrays)
• channel_data(index) → np.ndarray (bool, logic only)
• dso_data() → np.ndarray
• analog_data() → np.ndarray

TriggerConfig

• reset(), set_enabled(bool), set_mode(TriggerMode)
• set_position(percent), set_channel_trigger(ch, spec)

Exporter

• Exporter.to_csv(result, path, channels=None, time_column=True, compressed=True)
• Exporter.to_vcd(result, path, channels=None, timescale="1ns")
• Exporter.save_session(result, path)

Windows Source Patches

To build libsigrok4DSL on Windows (without the Qt GUI event loop), two files in DSView/libsigrok4DSL/hardware/DSL/ require patching:

dslogic.c

1. Dummy source polling — libusb_get_pollfds() returns FDs that Windows g_poll() cannot monitor. Three #ifdef _WIN32 blocks replace real FD polling with a dummy source (fd=-1, timeout=10ms) so receive_data() is called via the freewheel/timeout path in sr_session_run():

   • hw_dev_acquisition_start(): use sr_source_add(-1, 0, 10, ...) instead of iterating libusb_get_pollfds()
   • remove_sources(): remove the single dummy fd instead of iterating devc->usbfd[]
   • receive_data(): set libusb_handle_events_timeout to 10ms (instead of 0) to drive Windows overlapped I/O

2. Extra libusb_unref_device — Windows needs an additional libusb_unref_device() call after firmware upload to properly release the device handle before reconnect.

dsl.c

3. logic.unitsize assignment — In receive_transfer(), added logic.unitsize = (dsl_en_ch_num(sdi) + 7) / 8; so the SR_DF_LOGIC packet carries the correct unit size for downstream data decoding.

Running Tests

pytest tests/

test_export.py works without hardware. test_context.py, test_device.py, and test_capture.py require the compiled library and use the Demo device.

License

GPL-3.0-or-later (same as DSView). Bundled firmware files are from DreamSourceLab/DSView under the same license.

---

中文

DSView libsigrok4DSL 的 Python 绑定 — 用 Python 控制 DreamSourceLab 逻辑分析仪和示波器（DSLogic、DSCope），无需 Qt GUI。

安装

pip install pydsview

功能

• 发现并激活 DSLogic/DSCope/Demo 设备
• 配置采样率、采样数、通道、触发器
• 同步和异步采集
• NumPy 数组输出
• 导出 CSV（支持压缩模式）、VCD 和 DSView 会话文件（.dsl）
• 预编译 Windows DLL 和固件已内置 — 即装即用

架构

Python 用户代码
    └── pydsview (Python 包)
            ├── DSContext  — 库生命周期、设备列表
            ├── Device     — 配置、通道、采集
            ├── Capture    — 同步/异步数据采集
            ├── Trigger    — 触发器配置
            └── Exporter   — CSV / VCD / 会话导出
                    └── _binding.py (cffi ABI 模式)
                            └── libsigrok4dsl.dll/.so + shim.c
                                    └── libusb / glib / zlib

快速开始（Windows）

预编译 DLL 和固件已打包，直接安装即可使用：

pip install pydsview

开发模式：

git clone https://github.com/fankai777/pydsview.git
cd pydsview
pip install -e ".[dev]"

import pydsview

with pydsview.DSContext() as ctx:
    for info in ctx.list_devices():
        print(info.name, info.handle)

    dev = ctx.get_device(1)                            # DSLogic Plus
    dev.set_config(pydsview.Config.OPERATION_MODE, 1)  # 流模式
    dev.set_config(pydsview.Config.VTH, 1.0)           # 阈值电压 1.0V
    dev.samplerate = pydsview.SR_MHZ(1)
    dev.sample_count = 1_000_000

    result = dev.capture(timeout=10.0)

    # NumPy 数据
    data = result.to_numpy()
    ch0 = result.channel_data(0)   # bool 数组

    # 导出（压缩 CSV — 仅在信号变化时写入行）
    pydsview.export.Exporter.to_csv(result, "data.csv")
    pydsview.export.Exporter.to_vcd(result, "data.vcd")

从源码编译（Linux / 重新编译 DLL）

如需重新编译原生库：

cd pydsview/csrc
mkdir build && cd build
cmake .. -G "MinGW Makefiles"   # Windows (MSYS2 mingw64)
# cmake .. -G "Unix Makefiles"  # Linux
cmake --build .
cmake --install .               # 将 DLL/SO 复制到 pydsview/_libs/

编译依赖（与 DSView 相同）：

• glib-2.0（通过 pkg-config）
• libusb-1.0
• zlib
• pthreads

API 参考

DSContext(firmware_dir=None, user_data_dir=None)

初始化库，作为上下文管理器使用。固件已打包在 pydsview/res/ 中，自动加载。

• list_devices() → list[DeviceInfo]
• get_device(index) → Device
• load_session_file(path) → Device
• lib_version → str

Device

封装当前激活的设备。

• name、mode、device_type、channels
• samplerate（读/写）、sample_count（读/写）
• get_config(key)、set_config(key, value)
• enable_channel(index, enabled)、set_channel_name(index, name)
• capture(timeout=None) → CaptureResult（同步采集）
• start_capture() → CaptureSession（异步采集）

CaptureResult

• to_numpy() → np.ndarray
• to_channel_arrays() → list[np.ndarray]（逐通道 bool 数组）
• channel_data(index) → np.ndarray（bool，仅逻辑模式）
• dso_data() → np.ndarray
• analog_data() → np.ndarray

TriggerConfig

• reset()、set_enabled(bool)、set_mode(TriggerMode)
• set_position(percent)、set_channel_trigger(ch, spec)

Exporter

• Exporter.to_csv(result, path, channels=None, time_column=True, compressed=True)
• Exporter.to_vcd(result, path, channels=None, timescale="1ns")
• Exporter.save_session(result, path)

Windows 源码补丁

在 Windows 上编译 libsigrok4DSL（不依赖 Qt GUI 事件循环）需要修改 DSView/libsigrok4DSL/hardware/DSL/ 下的两个文件：

dslogic.c

1. 虚拟源轮询 — Windows 上 libusb_get_pollfds() 返回的 FD 无法被 g_poll() 监听。通过三处 #ifdef _WIN32 替换为虚拟源（fd=-1, timeout=10ms），使 receive_data() 通过 sr_session_run() 的超时路径被调用：

   • hw_dev_acquisition_start()：使用 sr_source_add(-1, 0, 10, ...) 替代遍历 libusb_get_pollfds()
   • remove_sources()：移除单个虚拟 fd 替代遍历 devc->usbfd[]
   • receive_data()：libusb_handle_events_timeout 设为 10ms（而非 0）以驱动 Windows overlapped I/O

2. 额外的 libusb_unref_device — Windows 需要在固件上传后额外调用一次 libusb_unref_device() 以正确释放设备句柄。

dsl.c

3. logic.unitsize 赋值 — 在 receive_transfer() 中添加 logic.unitsize = (dsl_en_ch_num(sdi) + 7) / 8;，使 SR_DF_LOGIC 数据包携带正确的单位大小，供下游数据解码使用。

运行测试

pytest tests/

test_export.py 无需硬件即可运行。test_context.py、test_device.py、test_capture.py 需要编译好的库并使用 Demo 设备。

许可证

GPL-3.0-or-later（与 DSView 一致）。内置的固件文件来自 DreamSourceLab/DSView，采用相同许可证。