From eed7072d6336a3cfdc8b52eb20166529a4de4d81 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Thu, 11 Apr 2019 16:22:04 +0200
Subject: Add some 1750 detection code to glutt-o-logic

---
 doc/perfboard.svg | 496 +++++++++++++++++++++++++++++++++++++++++++-----------
 doc/pio.txt       |  26 ++-
 doc/schematic.svg | 478 +++++++++++++++++++++++++++++++++++++++++++++++-----
 3 files changed, 850 insertions(+), 150 deletions(-)

(limited to 'doc')

diff --git a/doc/perfboard.svg b/doc/perfboard.svg
index 6aaa0ef..5c2ed38 100644
--- a/doc/perfboard.svg
+++ b/doc/perfboard.svg
@@ -2312,9 +2312,9 @@
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@@ -20672,6 +20672,24 @@
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+    <path
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-           style="font-size:14px;line-height:1.25;font-family:sans-serif">2019-03-02 HB9EGM ­— HB9FOH</tspan></text>
+           style="font-size:14px;line-height:1.25;font-family:sans-serif">2019-03-22 HB9EGM ­— HB9FOH</tspan></text>
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diff --git a/doc/pio.txt b/doc/pio.txt
index c8d74c0..856111c 100644
--- a/doc/pio.txt
+++ b/doc/pio.txt
@@ -24,11 +24,15 @@ Connexions Relais
 
 Analog signals
 --------------
--       in   NF (demod audio)   PB1 (ADC12 IN9)
+
+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
@@ -52,10 +56,20 @@ I2C to Audio Codec
 
 STM32DISCOVERY onboard things
 -----------------------------
--       out   Green LED         PD12
--       out   Orange LED        PD13
--       out   Red LED           PD14
--       out   Blue LED          PD15
--       in    Blue Push Button  PA0
+-       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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