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I did my own board with STM32F429IGT6, and connect the ST-Link v3 using the ST-Link Utility. "No target detected". Previously I had made my own boards, and the minimum connection is Vcaps to 2.2uF capacitors, nRst with 10k pull-up, and Boot to ground.The boards worked fine. The device is not detected by the programmer. Already checked supply voltages and grounds. Also SWDIO and SWCLK wires.

PIN 124  (TMS_SWDIO) -> PA13
PIN 137  (TCK_SWCLK) -> PA14

enter image description here

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  • \$\begingroup\$ Do you connect all 4 pins of the SWD to ST-Link? \$\endgroup\$ – Justme Sep 25 '19 at 4:02
  • \$\begingroup\$ Yes, everything connected properly. Guess I gotta stop buying stm32f4 from China... \$\endgroup\$ – j.p.mateos Sep 25 '19 at 4:05
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The BYPASS pin should be low to to enable internal regulator. Now it is high and disables internal regulator.

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  • \$\begingroup\$ You are right, that is the error. Thank you \$\endgroup\$ – j.p.mateos Sep 25 '19 at 5:34

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