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STM32F103C8Tx medium-density LQFP48
Pin mapping: see datasheet Table 5
## GPIO inputs
Analog RX AGC measurement (S-Meter)
* PA5
Digital buttons
* BTN0 PB1
* BTN1 PB0
* 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
CW output
* Sidetone PA8 (TIM1 CH1)
Microphone switches
* SW1 PA3 ADC12_IN3
* SW2 PA4 ADC12_IN4
## GPIO outputs
* SEQ0n PB3
* SEQ1 PB4
* SEQ2 PB5
* CW_KEYn PA15
* MUTE_SPKR PA2
* MUTE_MICn PA1
## 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
## Timers
TIM1 is an advanced control timer, TIM2,3,4 are general purpose
* TIM1 CW Sidetone PWM output
* TIM2 Clock timer
* TIM3 QEI decoder
* TIM4
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