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Allocation of PIOs to functions
===============================
Connexions Relais
-----------------
- in QRP_n PC1
- out TX_ON PC2
- N/A microphone PC3
- in 1750_n PC4
- out MOD_OFF PC5
- in SQ_n PC6
- in U PC8
- out QRP PC9
- in D PC11
- in REPLIE_n PC13
- in FAX_n PC14
- i/o ? PC15
- i/o Dallas 1-wire PA1
TODO Analog signals
-------------------
- in f_0 deviation
- in SWR forward PA6 (ADC12 IN6)
- in SWR reflected PA7 (ADC12 IN7)
- in Vcc 12V PA5 (ADC12 IN5)
u-blox NEO-M8N GPS module connection
------------------------------------
Yellow out UART3 TX to GPS RX PD8
Orange in UART3 RX to GPS TX PD9
- out GPS RESET_n PD10
Debug USART
-----------
- out UART2 TX to PC RX PA2
- in UART2 RX to PC TX PA3
I2C to Audio Codec
------------------
- o codec reset PD4
- - I2S3 MCK PC7
- - I2S3 CK PC10
- - I2S3 SD PC12
- - I2S3 WS PA4
- i/o I2C1 SDA PB9
- i/o I2C1 SCL PB6
STM32DISCOVERY onboard things
-----------------------------
- out Green LED PD12
- out Orange LED PD13
- out Red LED PD14
- out Blue LED PD15
- in Blue Push Button PA0
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