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+STM32F103C8Tx medium-density LQFP48
+
+Pin mapping: see datasheet Table 5
+
+## GPIO inputs
+
+Analog multi-level button inputs
+ * BTN0 PB1
+ * BTN1 PB0
+
+Digital buttons
+ * BTN2 PB12
+ * BTN3 PB13
+
+Digital rotary encoder
+ * ENC_A PA6 (TIM3 CH1)
+ * ENC_B PA7 (TIM3 CH2)
+ * ENC_BTN PC15 (limited current)
+
+CW paddle
+ * CW_TIP PB8
+ * CW_RING PB9
+
+Microphone switches
+ * SW1 PA3
+ * SW2 PA4
+
+## I2C1 for Si5351A-B-GT
+
+ * SCL PB6 default alternate function
+ * SDA PB7 default alternate function
+
+## I2C2 for Display, on address 0100<A2><A1><A0> depending on the solder bridges.
+
+ * SCL PB10 default alternate function
+ * SDA PB11 default alternate function