Connect pins on STM32F072C8 with next

PA0 ----- 1K -----|<|---+ 3.3V   Activity LED
PA1 ----- 100 om ----TARGET RESET
PA2 ----- 100 om ---- TARGET SWCLK
PA3 -------------------- TARGET SWO
PA4 ----- 100 om ---- TARGET SWDIO

PA9 ----- 100 om ---- (COM TX) TARGET RX
PA10 --- 100 om ---- (COM RX) TARGET TX

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