initial

.gitignore

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

.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

.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"
+    ]
+}

.vscode/settings.json

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+{
+    "python.pythonPath": "C:\\Users\\lord\\.platformio\\penv\\Scripts\\python.exe"
+}

extra_script.py

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+Import("env")
+
+env.Replace(
+    UPLOADCMD="scp $SOURCE pi@retropie:dev/fw.elf &&  ssh pi@retropie dev/prog_avr.sh dev/fw.elf"
+)

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

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

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:pro8MHzatmega328]
+platform = atmelavr
+board = pro8MHzatmega328
+framework = arduino
+extra_scripts = extra_script.py
+upload_protocol = custom
+build_flags = -Wall -O3 

src/main.cpp

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+#include <Arduino.h>
+
+static const uint8_t PORTD_ROWN = 0xFF;
+static const uint8_t PORTD_ROW0 = ~((1 << PD0));
+static const uint8_t PORTD_ROW1 = ~((1 << PD3));
+static const uint8_t PORTD_ROW2 = ~((1 << PD1));
+
+static const uint8_t OUT_LEN = 2;
+
+volatile uint8_t output[OUT_LEN];
+
+static inline void wait(uint16_t del) {
+  auto begin = millis();
+  while (millis() - begin < del);
+}
+
+static inline void update_output() {
+  PORTD = PORTD_ROW0;
+  delayMicroseconds(30);
+  uint8_t tmp = (PIND >> 4) & 0x0F;
+
+  PORTD = PORTD_ROW1;
+  delayMicroseconds(30);
+  tmp |= (PIND & 0xF0);
+
+  output[0] = tmp;
+
+  PORTD = PORTD_ROW2;
+  delayMicroseconds(30);
+  output[1] = (PIND >> 4) & 0x0F;
+
+  PORTD = PORTD_ROWN;
+  delayMicroseconds(30);
+}
+
+volatile uint8_t ctr = 0;
+// ISR(SPI_STC_vect) {
+//   SPDR = output[ctr];
+//   ctr = (ctr + 1) % OUT_LEN;
+// }
+
+ISR(PCINT0_vect){
+  if (!(PINB & (1 << PB2))) {
+  while(!(SPSR & (1<<SPIF)));
+  SPDR = output[1];
+  while(!(SPSR & (1<<SPIF)));
+  SPDR = output[0];
+  }
+  
+  // if (PINB & (1 << PB2)) {
+  //   SPDR = output[0];
+  // } else {
+  //   while(!(SPSR & (1<<SPIF)));
+  //   SPDR = output[1];
+  // }
+}
+
+void setup() {
+  Serial.end();
+
+  // port D for Button Matrix
+  DDRD = (1 << PD0) | (1 << PD1) | (1 << PD3);
+  PORTD = PORTD_ROWN;
+
+  // port B for SPI slave
+  DDRB &= ~((1 << 2) | (1 << 3) | (1 << 5));
+  DDRB |= (1 << 4);
+  PORTB |= 0x1E;
+
+  // Button Buffer
+  output[0] = 00;
+  output[1] = 00;
+
+  // SPI slave
+  SPCR &= ~(1 << MSTR);
+  SPCR |= (1 << SPE) /*| (1 << SPIE)*/ | (1 << DORD);
+
+  // SPI CS int
+  PCMSK0 |= (1<<PCINT2);
+  PCICR |= (1<<PCIE0);
+
+  // SPI prepare
+  update_output();
+  // SPDR = output[0];
+  // ctr = 1;
+}
+
+void loop() {
+  update_output();
+
+  wait(100);
+
+  // if (PINB & (1 << PB2)) {
+    // SPDR = output[0];
+  //   ctr = 1;
+  // } else {
+  //   ctr=0;
+  // }
+}

test/README

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+
+This directory is intended for PIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html