stm32samples/F1-nolib/STM32F103R_board.readme

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LEDs: PB8 - D2, PB9 - D1 (connected to +3.3V)
Buttons: PC0 - S2, PC1 - S3 (no pullup/down resistors! Connected to ground)
UNUSED due to JTAG: PA13, PA14, PA15, PB3, PB4.
RS232 (due to jumpers @ P4): PA9, PA10, PA2, PA3
J6 - USB pullup on/off