STlink V3 and STlink V2 are two generations of the ST microcontroller debuggers. The evolution of the ST-Link programmer has brought significant advancements from the ST-Link V2 to the ST-Link V3, making it crucial for developers to understand the differences and benefits of each version.
Here’s a breakdown of the key features and improvements that set them apart:
Performance & Speed Comparison
ST-Link V2: Operates at a maximum speed of 12 Mbit/s, which can be limiting when uploading large applications or debugging. If you want to upload large firmware, it might be slower.
ST-Link V3: Support for USB 2.0 Hi-Speed interface, allowing data transfer speeds up to 480 Mbit/s. This enhancement significantly reduces programming time and improves overall productivity for developers who frequently upload large applications.
Software Compatibility (CubeIDE, OpenOCD)
Both V2 and V3 are supported by STM32 Cube Programmer, STM32CubeIDE, OpenOCD, and most debug tools.
Supported Interfaces (SWD, JTAG, UART)
ST-Link V2: Primarily supports basic debugging functions with limited interface options. Supports SWD, JTAG, SWIM. SWIM is for STM8 Microcontrollers
ST-Link V3: Introduces multiple functionalities, including support for JTAG and SWD protocols. Features a modular architecture (e.g., ST-Link V3SET) that allows developers to add extension cards for enhanced functionality, such as power measurement and isolation. This adaptability is particularly beneficial in dynamic development environments where requirements may change. Broader range of applications, including low-power microcontrollers.
Power Supply Capabilities
ST-Link V2: Lacks advanced power management features.
ST-Link V3PWR: Can supply up to 2A to the target STM32 board, providing over-current protection through USB-C. This feature is especially useful for engineers working in the field who need reliable power supply options.
Which ST-Link Should You Buy?
ST-Link V3 vs ST-Link V2: Feature Comparison
| Feature | ST-LINK V2 | ST-LINK V3 |
|---|---|---|
| USB Speed | USB 2.0 Full-Speed (~12 Mb/s) (STMicroelectronics) | USB 2.0 Hi-Speed (~480 Mb/s) (The ST Blog) |
| SWD / JTAG Support | ✔️ (STMicroelectronics) | ✔️ (The ST Blog) |
| Virtual COM Port | ❌ (basic) (STMicroelectronics) | ✔️ (STMicroelectronics) |
| Mass Storage Drag-n-Drop | Optional in V2.1 (Promelec) | ✔️ (The ST Blog) |
| Bridge Interfaces (SPI/I2C etc.) | ❌ | ✔️ (some V3 modules) (STMicroelectronics) |
| Connector | 10-pin MIPI (older) (STMicroelectronics) | STDC-14 & USB-C (new) (The ST Blog) |
| Target Power / Measurement | ❌ | Possible (on V3PWR etc.) (STMicroelectronics) |
| Debug Speed | Moderate | Faster |
Quick comparison
| Feature | ST-Link V2 | ST-Link V3 |
|---|---|---|
| Max Debug Speed | Low | High |
| SWD Support | Yes | Yes |
| JTAG Support | Limited | Full |
| Voltage Range | 1.65–3.6V | 1.6–5.5V |
| Virtual COM Port | Yes | Yes |
| Target Power Output | No | Yes |
| Recommended For | Basic STM32 | Advanced STM32 |
]]>
0 Comments