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SWD Question

picguy2
Associate II
Posted on October 30, 2010 at 02:55

SWD Question

1 REPLY 1
Posted on May 17, 2011 at 14:13

Per the ST-LINK implementation, I think the minimal connection is 4 pins, perhaps 3 if you share a common voltage.

Pg 22

http://www.st.com/stonline/products/literature/um/17217.pdf

1     VDD_TARGET

2     SWCLK (JTCK)

3     GND

4     SWDIO (JTMS)

See also the debug section of the RM0008 reference manual.

I would be tempted to export USART1 Tx/Rx, the BOOT pins and RESET to either a header, test points or edge castellations.  Depends a lot on if you want standard/common connectors, and the desire for debug/dev or production/test features, and test fixturing.

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