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The debug interface present on the nRF52 devices is actually SWD and not JTAG.
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Yatekii 2020-07-17 01:05:16 +02:00 committed by GitHub
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embedded-workshop-book/src/flashing-program.md
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@ -14,4 +14,4 @@ The `cargo-flash` subcommand flashes and runs the program but won't display logs
**🔎 How does flashing work?**
The flashing process consists of the PC communicating with a second microcontroller on the nRF52840 DK over USB (J2 port). This second microcontroller, named J-Link, is connected to the nRF52840 through a electrical interface known as JTAG. The JTAG protocol specifies procedures for reading memory, writing to memory, halting the target processor, reading the target processor registers, etc.
The flashing process consists of the PC communicating with a second microcontroller on the nRF52840 DK over USB (J2 port). This second microcontroller, named J-Link, is connected to the nRF52840 through a electrical interface known as SWD. The SWD protocol specifies procedures for reading memory, writing to memory, halting the target processor, reading the target processor registers, etc.