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Pins connection SWD st-link to an external STM32F103RBT6

SIDRI.1
Associate III

‎2020-05-08 04:09 AM

Hi!

I'm trying to use my ST_linkV2 debugger to program an external STM32 microcontroller using SWD, is this configuration ok ?

: CN4 (STLlink) Vdd----------> Vdd (stm32 MCU)

SWCLK------> PA14 (SWCLK)

GND---------> GND

SWDIO------> PA13 (SWDIO) + 100K pull up resistor) )

Thank you in advance for your response

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3 REPLIES 3
Uwe Bonnes
Principal II

‎2020-05-08 04:20 AM

VDD connection is not needed. Pullup not needed. Otherweise ok. Additional ground connection enhance reliability

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SIDRI.1
Associate III
In response to Uwe Bonnes

‎2020-05-08 04:41 AM

Thank you for you quick response, VDD is used to power the external microcontroller during programming mode, i guess

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Uwe Bonnes
Principal II

‎2020-05-08 07:05 AM

If you use a stand alone STLINk, VDD line is used to report target voltage. Other debugger may use the VDD line to power level translation between target and debugger. Build-in stlinks only report STLink voltage.

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