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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, all with external pullup
* BTN A PB1
* BTN B PB0
* BTN C PB12
* BTN D PB13
Digital rotary encoder
* ENC_A PA6 (TIM3 CH1)
* ENC_B PA7 (TIM3 CH2)
* ENC_BTN PC15 (external pullup, limited current)
CW paddle
* CW_TIP PB8
* CW_RING PB9
CW output
* Sidetone PA8 (TIM1 CH1)
Microphone switches
* MIC_PTT PA3 ADC12_IN3 (floating)
* VOX_PTTn PA0 ADC12_IN0 (needs internal pullup)
## GPIO outputs
* EN_PA PB3
* EN_RX PB4
* EN_TX PB5
* CW_KEYn PA15
* MUTE_SPKR PA2
* MUTE_MICn PA1
* STATUSn PB14
## Reserved for future use
To XTAL filter board
* GPIO_XTAL PA4 ADC12_IN4
J33 Header
* PB15
* PA9 USART1_TX
* PA10 USART1_RX
## 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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