initial commit

.gitignore

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+.pio

cpp/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

cpp/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

cpp/lib/color_utils/color_utils.cpp

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+#include <Arduino.h>
+
+uint16_t rgb_to_12bit(float r, float g, float b) {
+  return ((uint16_t)(r*15) << 8) | ((uint16_t)(g*15) << 4) | (uint16_t)(b*15);
+}
+

cpp/lib/color_utils/color_utils.h

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+uint16_t rgb_to_12bit(float r, float g, float b);

cpp/lib/keyboard/keyboard.cpp

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+#include <Arduino.h>
+#include "keyboard.h"
+//#include <Wire.h>
+
+// this is slightly inefficient because not all 5 rows have 13 keys each and we could have fit escape in there
+unsigned long keys_down[5 * 13 + 1];
+// this is inefficient because we only need one bit per key
+byte keys_pressed[5 * 13 + 1];
+
+#define KEY_REPEAT 200
+
+/*
+void requestEvent() {
+    Wire.write(keys, 8);
+    for (int i=0; i<8; ++i) {
+        keys[i] = 0;
+    }
+}
+*/
+
+void keyboard_init() {
+    pinMode(R0, OUTPUT);
+    pinMode(R1, OUTPUT);
+    pinMode(R2, OUTPUT);
+    pinMode(R3, OUTPUT);
+    pinMode(R4, OUTPUT);
+
+    pinMode(C0, INPUT_PULLDOWN);
+    pinMode(C1, INPUT_PULLDOWN);
+    pinMode(C2, INPUT_PULLDOWN);
+    pinMode(C3, INPUT_PULLDOWN);
+    pinMode(C4, INPUT_PULLDOWN);
+    pinMode(C5, INPUT_PULLDOWN);
+    pinMode(C6, INPUT_PULLDOWN);
+    pinMode(C7, INPUT_PULLDOWN);
+    pinMode(C8, INPUT_PULLDOWN);
+    pinMode(C9, INPUT_PULLDOWN);
+    pinMode(C10, INPUT_PULLDOWN);
+    pinMode(C11, INPUT_PULLDOWN);
+    pinMode(C12, INPUT_PULLDOWN);
+
+    pinMode(ESC, INPUT_PULLDOWN);
+
+    //Wire.begin();
+    //Wire.begin(8);
+    //Wire.onRequest(requestEvent);
+}
+
+
+void key_press(uint8_t index, unsigned long time) {
+  keys_down[index] = time;
+  keys_pressed[index] = 1;
+}
+
+void key_up(uint8_t index) {
+  keys_down[index] = 0;
+}
+
+void check_key(uint8_t index, byte value) {
+  if (value == HIGH) {
+    unsigned long time = millis();
+
+    // TODO: we probably don't even need this check if we only have presses and no keydown events as time - 0 will also be >= KEY_REPEAT
+    if (keys_down[index]) {
+      // ignore unless it has been long enough to repeat
+      if (time - keys_down[index] >= KEY_REPEAT) {
+        key_press(index, time);
+      }
+    }
+    else {
+      // wasn't down before, is now so it is pressed
+      // TODO: do we want keydown events too?
+      key_press(index, time);
+    }
+  }
+  else {
+    // TODO: we don't technically have to check this until we have keyup events
+    if (keys_down[index]) {
+      key_up(index);
+    }
+  }
+}
+
+void keyboard_poll() {
+    for (int r=0; r<5; r++) {
+        // TODO: this can be optimised a lot
+
+        digitalWrite(R0, (r == 0) ? HIGH : LOW);
+        digitalWrite(R1, (r == 1) ? HIGH : LOW);
+        digitalWrite(R2, (r == 2) ? HIGH : LOW);
+        digitalWrite(R3, (r == 3) ? HIGH : LOW);
+        digitalWrite(R4, (r == 4) ? HIGH : LOW);
+
+        check_key(r*13 + 0, digitalRead(C0));
+        check_key(r*13 + 1, digitalRead(C1));
+        check_key(r*13 + 2, digitalRead(C2));
+        check_key(r*13 + 3, digitalRead(C3));
+        check_key(r*13 + 4, digitalRead(C4));
+        check_key(r*13 + 5, digitalRead(C5));
+        check_key(r*13 + 6, digitalRead(C6));
+        check_key(r*13 + 7, digitalRead(C7));
+        check_key(r*13 + 8, digitalRead(C8));
+        check_key(r*13 + 9, digitalRead(C9));
+        check_key(r*13 + 10, digitalRead(C10));
+        check_key(r*13 + 11, digitalRead(C11));
+        check_key(r*13 + 12, digitalRead(C12));
+    }
+
+    check_key(5*13, digitalRead(ESC));
+}

cpp/lib/keyboard/keyboard.h

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+#define R0 PC11
+#define R1 PC12
+#define R2 PC13
+#define R3 PC14
+#define R4 PC15
+#define C0 PF1
+#define C1 PC0
+#define C2 PC1
+#define C3 PC2
+#define C4 PC3
+#define C5 PA0
+#define C6 PA1
+#define C7 PA2
+#define C8 PA3
+#define C9 PA4
+#define C10 PA5
+#define C11 PA6
+#define C12 PA7
+#define ESC PF0
+
+extern unsigned long keys_down[5 * 13 + 1];
+extern byte keys_pressed[5 * 13 + 1];
+
+void keyboard_init();
+void keyboard_poll();