Merge pull request #35 from roleroz/master

With this you can use cheap programmers like https://www.amazon.com/gp/product/B09DG384MK to program your micro-controllers in-circuit

Also, update Travis config for it to work with current versions. All software versions listed in the config were fairly old, and didn't work anymore

.travis.yml

@@ -1,4 +1,4 @@
-dist: trusty
+dist: focal
 
 notifications:
   email:
@@ -11,15 +11,16 @@ addons:
     packages:
       - pkg-config
       - python
-      - python-pip
+      - python3-pip
       - unzip
       - wget
       - zip
 
 before_install:
-  - wget https://github.com/bazelbuild/bazel/releases/download/0.27.2/bazel_0.27.2-linux-x86_64.deb
-  - sha256sum -c bazel/bazel_0.27.2-linux-x86_64.deb.sha256
-  - sudo dpkg --force-all -i bazel_0.27.2-linux-x86_64.deb
+  - wget https://github.com/bazelbuild/bazel/releases/download/6.0.0/bazel_6.0.0-linux-x86_64.deb
+  - wget https://github.com/bazelbuild/bazel/releases/download/6.0.0/bazel_6.0.0-linux-x86_64.deb.sha256
+  - sha256sum -c bazel_6.0.0-linux-x86_64.deb.sha256
+  - sudo dpkg --force-all -i bazel_6.0.0-linux-x86_64.deb
   - sudo /usr/bin/pip install platformio
 
 script:

platformio/platformio.bzl

@@ -482,6 +482,7 @@ options.
         values = [
           "arduino_as_isp",
           "direct",
+          "usbtinyisp",
         ],
         doc = """
 Type of programmer to use:
@@ -490,6 +491,8 @@ 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).
+- usbtinyisp: Use an USBTinyISP programmer, like
+https://www.amazon.com/gp/product/B09DG384MK
 """,
       ),
       "deps": attr.label_list(

platformio/platformio.ini.tmpl

@@ -7,6 +7,13 @@ If you are working on the template, knock yourself out ;) #}
 [platformio]
 default_envs = {{ board }}
 
+{%- if programmer == "usbtinyisp" %}
+[env:myenv]
+platform = atmelavr
+framework = arduino
+upload_protocol = usbtiny
+
+{%- endif %}
 [env:{{ board }}]
 build_flags =
   -Wall
@@ -38,4 +45,16 @@ upload_flags =
     -c
     stk500v1
 upload_command = avrdude $UPLOAD_FLAGS -U flash:w:$SOURCE:i
-{% endif %}
+{%- endif %}
+{%- if programmer == "usbtinyisp" %}
+upload_protocol = custom
+upload_flags =
+    -C
+    ; use "tool-avrdude-megaavr" for the atmelmegaavr platform
+    ${platformio.packages_dir}/tool-avrdude/avrdude.conf
+    -p
+    $BOARD_MCU
+    -c
+    usbtiny
+upload_command = avrdude $UPLOAD_FLAGS -U flash:w:$SOURCE:i
+{%- endif %}