Merge pull request #34 from roleroz/master

Allow Arduino as ISP as programmer

platformio/platformio.bzl

@@ -178,6 +178,8 @@ def _emit_ini_file_action(ctx, output_files):
     framework=ctx.attr.framework,
     environment_kwargs=environment_kwargs,
     build_flags=build_flags,
+    programmer=ctx.attr.programmer,
+    port=ctx.attr.port,
   ).to_json()
   ctx.actions.run(
     outputs=[output_files.platformio_ini],
@@ -429,6 +431,12 @@ A string, name of the Arduino board to build this project for. You can
 find the supported boards in the
 [PlatformIO Embedded Boards Explorer](http://platformio.org/boards). This is
 mandatory.
+""",
+      ),
+      "port": attr.string(
+        doc = """
+Port where your microcontroller is connected. This field is mandatory if you
+are using arduino_as_isp as your programmer.
 """,
       ),
       "platform": attr.string(
@@ -467,6 +475,21 @@ generated platformio.ini file in the build_flags option for the selected
 env:board section. Refer to the [Project Configuration File manual](
 http://docs.platformio.org/en/latest/projectconf.html) for the available
 options.
+""",
+      ),
+      "programmer": attr.string(
+        default = "direct",
+        values = [
+          "arduino_as_isp",
+          "direct",
+        ],
+        doc = """
+Type of programmer to use:
+- direct: Use the USB connection in the microcontroller deveopment board to
+program it
+- arduino_as_isp: Use an arduino programmed with the Arduino as ISP code to
+in-circuit program another microcontroller (see
+https://docs.arduino.cc/built-in-examples/arduino-isp/ArduinoISP for details).
 """,
       ),
       "deps": attr.label_list(

platformio/platformio.ini.tmpl

@@ -22,3 +22,20 @@ framework =
 {%- for kwarg in environment_kwargs %}
   {{environment_kwargs}}
 {%- endfor %}
+{%- if programmer == "arduino_as_isp" %}
+upload_protocol = custom
+upload_port = {{ port }}
+upload_speed = 19200
+upload_flags =
+    -C
+    ${platformio.packages_dir}/tool-avrdude/avrdude.conf
+    -p
+    $BOARD_MCU
+    -P
+    $UPLOAD_PORT
+    -b
+    $UPLOAD_SPEED
+    -c
+    stk500v1
+upload_command = avrdude $UPLOAD_FLAGS -U flash:w:$SOURCE:i
+{% endif %}

tests/blink/BUILD

@@ -0,0 +1,34 @@
+load("//platformio:platformio.bzl", "platformio_project")
+
+configs = [
+    {
+        "name": "attiny85",
+        "board": "attiny85",
+        "build_flags": ["-DTARGET_PIN=4"],
+        "programmer": "arduino_as_isp",
+        "port": "/dev/ttyUSB0",
+    },
+    {
+        "name": "nano",
+        "board": "nanoatmega328",
+        "build_flags": [],
+        "programmer": "direct",
+        "port": "unused",
+    },
+]
+
+[platformio_project(
+    name = "blink_%s" % config["name"],
+    src = "blink.cc",
+    board = config["board"],
+    framework = "arduino",
+    platform = "atmelavr",
+    build_flags = config["build_flags"],
+    programmer = config["programmer"],
+    port = config["port"],
+    deps = [
+        "//tests/arduino:Arduino_impl",
+        "//tests/arduino:Arduino_interface",
+    ],
+) for config in configs]
+

tests/blink/README.md

@@ -0,0 +1,18 @@
+# A blinking LED
+
+The most classic electronics example, blinking an LED, is an example of an
+Arduino project.
+
+This project has no inputs, and only uses one output to blink the LED.
+
+## The circuit
+
+### On Arduino Nano
+You don't need to connect anything, the Arduino Nano has an internal LED
+connected to the right pin
+
+### On Arduino Mega
+![The clinking LED breadboard](doc/blink_attiny_bb.png)
+
+The [Fritzing](http://fritzing.org) circuit is stored in file
+[binary_counter.fzz](doc/blink_attiny.fzz).

tests/blink/blink.cc

@@ -0,0 +1,41 @@
+// Blink an LED. The "hello world" of electronics.
+//
+// By default this will blink an LED connected to pin 13 (standard Arduino)
+// with a 1/2 Hz frequency and a 50% duty cycle (1 second on, 1 second off).
+//
+// You can change the behaviour with the following macros at compile time:
+// - TARGET_PIN: The number of the pin where the LED is connected to
+// - TIME_HIGH_MS: The number of milliseconds the LED will be on per cycle
+// - TIME_LOW_MS: The number of milliseconds the LED will be off per cycle
+
+#include <Arduino.h>
+#include <Arduino_impl.h>
+#include <Arduino_interface.h>
+
+using arduino::ArduinoImpl;
+using arduino::ArduinoInterface;
+
+#ifndef TARGET_PIN
+// If target pin is not defined, use the Arduino standard 13
+#define TARGET_PIN 13
+#endif
+#ifndef TIME_HIGH_MS
+#define TIME_HIGH_MS 1000
+#endif
+#ifndef TIME_LOW_MS
+#define TIME_LOW_MS 1000
+#endif
+
+// Arduino hardware layer.
+const ArduinoImpl ino = ArduinoImpl();
+
+void setup() {
+    pinMode(TARGET_PIN, OUTPUT);
+}
+
+void loop () {
+    ino.DigitalWrite(TARGET_PIN, HIGH);
+    ino.Delay(TIME_HIGH_MS);
+    ino.DigitalWrite(TARGET_PIN, LOW);
+    ino.Delay(TIME_LOW_MS);
+}