First commit. Starting to get files up.

feeder/code/firmware_feeder/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

feeder/code/firmware_feeder/.travis.yml

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+# Continuous Integration (CI) is the practice, in software
+# engineering, of merging all developer working copies with a shared mainline
+# several times a day < https://docs.platformio.org/page/ci/index.html >
+#
+# Documentation:
+#
+# * Travis CI Embedded Builds with PlatformIO
+#   < https://docs.travis-ci.com/user/integration/platformio/ >
+#
+# * PlatformIO integration with Travis CI
+#   < https://docs.platformio.org/page/ci/travis.html >
+#
+# * User Guide for `platformio ci` command
+#   < https://docs.platformio.org/page/userguide/cmd_ci.html >
+#
+#
+# Please choose one of the following templates (proposed below) and uncomment
+# it (remove "# " before each line) or use own configuration according to the
+# Travis CI documentation (see above).
+#
+
+
+#
+# Template #1: General project. Test it using existing `platformio.ini`.
+#
+
+# language: python
+# python:
+#     - "2.7"
+#
+# sudo: false
+# cache:
+#     directories:
+#         - "~/.platformio"
+#
+# install:
+#     - pip install -U platformio
+#     - platformio update
+#
+# script:
+#     - platformio run
+
+
+#
+# Template #2: The project is intended to be used as a library with examples.
+#
+
+# language: python
+# python:
+#     - "2.7"
+#
+# sudo: false
+# cache:
+#     directories:
+#         - "~/.platformio"
+#
+# env:
+#     - PLATFORMIO_CI_SRC=path/to/test/file.c
+#     - PLATFORMIO_CI_SRC=examples/file.ino
+#     - PLATFORMIO_CI_SRC=path/to/test/directory
+#
+# install:
+#     - pip install -U platformio
+#     - platformio update
+#
+# script:
+#     - platformio ci --lib="." --board=ID_1 --board=ID_2 --board=ID_N

feeder/code/firmware_feeder/.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}

feeder/code/firmware_feeder/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

feeder/code/firmware_feeder/lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

feeder/code/firmware_feeder/lib/ring/ring.cpp

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+#include "../../src/define.h"
+#include "ring.h"
+
+int Ring::call(){
+
+/*
+
+call() sends a message over RING. it is dependent on:
+    -class variable "timeout" which determines how long it waits for a response before exiting
+    -message_out class variable, which is a byte with all the bits to be sent.
+
+If call() returns 0, the message was sent successfully and the recipient acknowledged it.
+if it returns 1, the recipient never picked up.
+if it returns 2, the recipient picked up, but did not acknowledge
+
+*/
+
+    int status = 0;
+
+    //getting ready to detect response to ring
+    pinMode(DAT, INPUT_PULLUP);
+
+    //starting to ring with pulling clock low
+    pinMode(CLO, OUTPUT);
+    digitalWrite(CLO, LOW);
+
+    //waiting for response
+    unsigned long start_millis;
+    start_millis = millis();
+
+    while(digitalRead(DAT)){
+        if(millis() - start_millis > timeout){
+            status = 1;
+            break;
+        }
+    }
+
+    if(status == 0){ //if we didn't timeout, sent the message
+
+        digitalWrite(CLO, HIGH);
+
+        //give a bit of a delay to wait for recipient to set pins to the appropriate mode
+        delay(15);
+
+        //set DAT to output
+        pinMode(DAT, OUTPUT);
+        digitalWrite(DAT, HIGH);
+
+        //start sending the data!
+        for(int i = 0; i<8; i++){
+            digitalWrite(DAT, message_out[i]);
+            delay(20);
+            digitalWrite(CLO, LOW);
+            delay(10);
+            digitalWrite(CLO, HIGH);
+            delay(20);
+
+        }
+
+        //listen for ACK bit
+        pinMode(DAT, INPUT_PULLUP);
+
+        delay(20);
+
+        //9th ACK CLO Pulse
+
+        digitalWrite(CLO, LOW);
+        int ack = digitalRead(DAT);
+        delay(10);
+
+        pinMode(CLO, INPUT_PULLUP);
+
+        if(!ack){
+            Serial.println("Received ACK bit");
+        }
+        else{
+            Serial.println("Did not receieve ack bit");
+        }
+
+
+    }
+
+    return status;
+
+}
+
+int Ring::pickUp(){
+
+/*
+
+pickUp() listens to a message over RING. pickUp() should be called when it's detected that CLO is pulled low
+
+If pickUp() returns 0, the message was received successfully and the data has been stored in class variable message_in.
+if it returns 1, the communication failed due to timeout.
+
+*/
+
+    //setting status to 0 as default
+    int status = 0;
+
+    //Send signal back through DAT line that we picked up
+    pinMode(DAT, OUTPUT);
+    digitalWrite(DAT, LOW);
+    delay(5);
+
+    pinMode(DAT, INPUT_PULLUP);
+
+    //Listen to 8 bits get clocked in and store them
+
+    for (int i = 0; i<8; i++){
+
+        unsigned long start_millis;
+        start_millis = millis();
+
+        while(digitalRead(CLO)){
+            //do nothing while CLO == HIGH, waiting for clock pulse low from sender
+
+            //timeout
+            if(millis() - start_millis > 100){
+                status = 2;
+                break;
+            }
+        }
+        int bit = digitalRead(DAT);
+        Serial.println(bit);
+        message_in[i] = bit;
+
+        if(!digitalRead(CLO)){
+            while(!digitalRead(CLO)){
+                //do nothing, waiting for clock pulse to end
+            }
+        }
+
+    }
+
+    delay(30);
+
+    //Respond with reciept of response
+    pinMode(DAT, OUTPUT);
+    digitalWrite(DAT, LOW);
+
+    while(digitalRead(CLO)){ //waits for clock pulse to start
+        //do nothing
+        //ADD TIMEOUT
+    }
+    delay(2);
+    while(!digitalRead(CLO)){ //waits for clock pulse to end
+        //do nothing
+        //ADD TIMEOUT
+    }
+
+    //returning clock pin to input pullup
+    pinMode(DAT, INPUT_PULLUP);
+
+    //returning status of message
+    return status;
+
+}

feeder/code/firmware_feeder/lib/ring/ring.h

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+#include <Arduino.h>
+
+class Ring
+{
+    public:
+        unsigned long timeout = 3000;
+        int message_in[8];
+        int message_out[8];
+
+        int call();
+        int pickUp();
+
+};

feeder/code/firmware_feeder/platformio.ini

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+;PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:nanoatmega328]
+platform = atmelavr
+board = nanoatmega328
+framework = arduino
+
+upload_protocol = stk500v1
+upload_flags = 
+    -P$UPLOAD_PORT 
+    -b$UPLOAD_SPEED
+
+# edit these lines
+upload_port = /dev/cu.usbserial-14240
+upload_speed = 19200
+
+
+
+lib_extra_dirs = ../../../lib/cpp

feeder/code/firmware_feeder/src/define.h

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+#define OPTO A3
+#define nSLEEP 2
+#define MOTOR_EN 3
+#define MOTOR_PH 4 //high is ____, low is ____
+#define LED 8      //high is Orange (bottom LEd), low is GREEN (top led)
+#define SW1 7
+#define SW2 6
+#define TDS 5
+
+
+#define BLINK_FREQ 500
+
+//#define DEBUG