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I designed a PCB that has a STM32F405RGT6 as its MCU. I took out the USB in the design because I thought that I only need it for the power. Now I am wondering if I can program it via SWD with only the ST-Link/V2 and a LiPo battery as the power input. Any insights are very helpful!

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No, you don't need USB.

Yes, as long as you power the board and MCU gets 3.3V supply, you can program with SWD or JTAG. Using ST-Link. That's what they are for. Except for ST-Link clones, they are a waste of time and money.

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  • \$\begingroup\$ Thank you very much! I already have the PCB, right now I am waiting for the battery to arrive and I thought that I already screwed up. \$\endgroup\$
    – Robert
    Commented Sep 14 at 16:38

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