Serial Wire Debug

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A bunch of ST-Link Clones. These usually cost less than $2

SWD is a ARM specific 2-wire version of JTAG. It enables developers to manipulate the built-in flash (flash new firmware), to debug firmware and to monitor memory locations (variables), live, while the firmware is running.

Here is an example of a Chinese clone ST-Link hooked up to one of our Green Pill boards:

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As can be seen on the photo, the GND and the 3.3V supply lines are also hooked up.

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