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Allocation of PIOs to functions
===============================
Ref: Datasheet Table 7 on p. 45 and Table 9 on p. 60
Connexions Relais
-----------------
- in QRP_n PC1
- out TX_ON PC2
- N/A microphone PC3
- in 1750_n bouton PC4
- out MOD_OFF PC5
- in SQ_n PC6
- in U PC8
- out QRP PC9
- in D PC11
- in REPLIE PC13
- out FAX PC14
- out GPS EPPS PC15
- out SQ2 PC0 (ATTN: is also enabling 5V USB OTG, turns on LD7)
- out DET 1750 PA8
- i/o Dallas 1-wire PA1
Analog signals
--------------
on ADC1, configured in single-shot mode, software trigger:
- in Vcc 12V PA5 (ADC12 IN5)
- in SWR forward PA6 (ADC12 IN6)
- in SWR reflected PA7 (ADC12 IN7)
on ADC2, configured in single-shot mode, triggered by a timer:
- in NF (demod audio) PB1 (ADC12 IN9)
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 (launcher) PD12
- out Orange LED (fsm) PD13
- out Red LED (audio) PD14
- out Blue LED (audio in) PD15
- in Blue Push Button PA0
Analog audio input for 1750 tone detector
-----------------------------------------
1. Timer 6 set to 8kHz triggers ADC2 sample.
1. Timer 6 ISR accumulates N samples into a buffer.
1. When buffer full, copy it into queue.
1. `nf_analyse` task retrieves audio from queue, and gives it to tone detector.
1. Tone detector returns one of [yes, no, more samples needed].
1. `nf_analyse` task updates FSM input accordingly.
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