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Merge #348
348: Update README.md: about the SB10 on old version r=eldruin a=chirping78 Co-authored-by: chirping78 <chirping78@hotmail.com>
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src/06-hello-world/README.md

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> **HEADS UP** The "solder bridge" SB10 (see back of the board) on the STM32F3DISCOVERY, which is
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> required to use the ITM and the `iprint!` macros shown below, is **not** soldered by default
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> (see page 21 of the [User Manual][]).
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> (To be more accurate: this actually depends on the board revision. If you have an old version of
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> the board as the [old User Manual][User Manual v3] said, the SB10 was soldered. Check your board
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> to decide whether you need to fix it.)
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> **TL;DR** You have two options to fix this: Either **solder** the solder bridge SB10 or connect a
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> female to female jumper wire between SWO and PB3 as shown in the picture below.
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[User Manual]: http://www.st.com/resource/en/user_manual/dm00063382.pdf
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[User Manual v3]: https://docs.rs-online.com/5192/0900766b814876f9.pdf
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<p align="center">
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<img height=640 title="Manual SWD connection" src="../assets/f3-swd.png">

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