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I use STM32f103RCT6 to blinking led in pin A8 with 1 second delay, and i try to use logic analyzer to see whether it's right. However, when i setup in "Current Logic Analyzer Signal", i write PA.8 in it and it say "Unknown Signal". I was trying write everything "PORTA.8","PortA.8","PA8" but it always say "Unknown Signal". What signal' name i should write in it???