inicial

.gitignore

@@ -0,0 +1,5 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

include/I2C_COM_API.hpp

@@ -0,0 +1,38 @@
+// Comandos del cronómetro
+enum ChronoCommands
+{
+    ForceStart = 0x01, // Forzar inicio
+    ForceStop = 0x02,  // Forzar detención
+    ForceReset = 0x04  // Forcer reinicio del cronómetro
+};
+
+// Modos de operación del dispositivo
+enum DeviceModes
+{
+    CHRONO = 0x00 // Modo Cronómetro
+};
+
+// Estructura para un comando de la API sin datos
+struct ChronoAPICommand
+{
+    const static char type = 0xAA; // Cabecera de Comando
+    ChronoCommands command;        // Comando solicitado
+};
+
+// Unión genérica para serializar y des-serializar tipos
+template <typename T>
+union buffer
+{
+    T data;
+    uint8_t buffer[sizeof(T)];
+};
+
+// Función para enviar un buffer por I2C
+template <typename T>
+void SendBuffer(buffer<T> buffer)
+{
+    Wire.flush();
+    Wire.beginTransmission(0x26);
+    Wire.write(buffer.buffer, sizeof(T));
+    Wire.endTransmission();
+}

include/README

@@ -0,0 +1,39 @@
+
+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

@@ -0,0 +1,46 @@
+
+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

@@ -0,0 +1,25 @@
+; 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:attiny85]
+platform = atmelavr
+board = attiny85
+board_build.f_cpu =8000000L
+framework = arduino
+upload_protocol=stk500v1
+
+upload_port = /dev/ttyUSB1
+upload_speed = 19200
+
+upload_flags = 
+    -b$UPLOAD_SPEED
+    -P$UPLOAD_PORT 
+    
+#lib_deps = nickcengel/TinyWireSio@0.0.0-alpha+sha.722ada4382

src/main.cpp

@@ -0,0 +1,117 @@
+/*
+ * Firmware de cronómetro con detector laser
+ * Este firmware permite detectar el tiempo transcurrido en
+ * milésimas de segundo des de que se interrumpe
+ */
+#include <Arduino.h>
+#include <Wire.h>
+#include <avr/interrupt.h>
+#include <avr/iotn85.h>
+#undef F_CPU
+#define F_CPU 8000000
+
+#include "I2C_COM_API.hpp"
+
+#define I2C_SLAVE_ADDR 0x26
+#define LDR_START PCINT1
+#define LDR_STOP PCINT3
+
+uint8_t master_data[16];
+uint8_t master_data_length;
+
+buffer<long> ms;      // Buffer donde se almacena el valor del cronómetro
+bool started = false; // Flag que indica si el cronómetro está iniciado
+long reference = 0;   // Variable de referencia para calcular el incremento de tiempo
+DeviceModes mode = CHRONO;
+
+// Responder a solicitudes I2C
+void requestHandler()
+{
+  switch (mode)
+  {
+  case CHRONO: // En modo cronómetro o por defecto, enviar buffer de tiempo.
+  default:
+#warning Workarround para el problema de la función millis
+    buffer<long> ms2 = ms;
+    ms2.data *= 2;
+    SendBuffer(ms2);
+    break;
+  }
+}
+
+void receiveHandler(int length)
+{
+  for (uint8_t i = 0; i < length; i++)
+    master_data[i] = Wire.read();
+
+  // El mensaje es un comando de cronómetro
+  //if (master_data[0] == ChronoAPICommand::type)
+  //{
+  //  switch ((ChronoCommands)master_data)
+  //  {
+  //  case (ChronoCommands::ForceStart):
+  //    started = true;
+  //    break;
+  //  case (ChronoCommands::ForceStop):
+  //    started = false;
+  //    break;
+  //  case (ChronoCommands::ForceReset):
+  //    reference = millis();
+  //    break;
+  //  }
+  //}
+}
+
+// Vector INT0 para detectar interrupciones
+ISR(PCINT0_vect)
+{
+  bool strt = !digitalRead(LDR_START); // Invert start signal read
+  bool stop = digitalRead(LDR_STOP);
+
+  if (started)
+  {
+    // El cronómetro está en marcha y se detecta
+    // la condición de parada
+    if (stop)
+      started = false;
+  }
+  else
+  {
+    // El cronómetro está parado y se detecta
+    // la condición de inicio
+    if (strt)
+    {
+      reference = millis();
+      started = true;
+    }
+  }
+}
+
+void setup()
+{
+  // Resetear todas las salidas
+  PORTB = 0x00;
+  // Iniciar el bus I2C
+  Wire.begin(I2C_SLAVE_ADDR);
+  Wire.onReceive(receiveHandler);
+  Wire.onRequest(requestHandler);
+
+  // Poner los pines del comparador en modo entrada
+  pinMode(LDR_START, INPUT);
+  pinMode(LDR_STOP, INPUT);
+
+  // Configurar registros para habilitar las interrupciones
+  cli();
+  MCUCR |= 0b00000001;                  // Interrumpir con cualquier cambio de nivel
+  GIMSK |= (1 << PCIE);                 // Activar PCINT (Pin Change Interrupt)
+  PCMSK |= (1 << PCINT1 | 1 << PCINT3); // Habilitar interrupción para los pines de la LDR
+  sei();
+}
+
+void loop()
+{
+
+  if (started)                      // Si el cronómetro está funcionando:
+    ms.data = millis() - reference; //   Actualizar marca de tiempo
+  delay(1);                         // Darle tiempo al attiny para que se haga un café
+}

test/README

@@ -0,0 +1,11 @@
+
+This directory is intended for PlatformIO 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 PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html