Read arguments to avrdude from cross file and use an option to change default serial port.

Author: tommie-lie

arduino_uno_cross.txt

@@ -6,6 +6,8 @@ strip = '/usr/bin/avr-strip'
 
 [properties]
 variant = 'standard'
+avrdude_speed = '115200'
+avrdude_programmer = 'arduino'
 
 c_args = [
   '-ffunction-sections',

meson.build

@@ -12,6 +12,8 @@ project('arduino blink', 'c', 'cpp',
 assert(meson.is_cross_build(), 'Arduino projects can only be built in a cross build environment.')
 
 cross_variant = meson.get_cross_property('variant')
+avrdude_speed = meson.get_cross_property('avrdude_speed')
+avrdude_programmer = meson.get_cross_property('avrdude_programmer')
 
 dependencies = [['arduinocore', 'arduinocore-avr'],
                 ['arduinocore-main', 'arduinocore-avr']]
@@ -36,9 +38,8 @@ stripped = custom_target('stripped',
 avrdude = find_program('avrdude')
 run_target('upload',
   command : [avrdude,
-  '-C/usr/share/arduino/hardware/tools/avrdude.conf',
-  '-v', '-v', '-v', '-v',
-  '-patmega328p', '-carduino', '-P/dev/ttyACM0', '-b115200',
+  '-v',
+  '-p' + target_machine.cpu(), '-P' + get_option('port'),  '-c' + avrdude_programmer, '-b' + avrdude_speed,
   '-D', '-Uflash:w:@0@:e'.format(stripped.full_path())],
   depends : stripped
 )

meson_options.txt

@@ -0,0 +1 @@
+option('port', type : 'string', value : '/dev/ttyACM0', description : 'The serial port that the Arduino is connected to.')

readme.md

@@ -15,13 +15,15 @@ The result can be uploaded with the following command:
 This command will rebuild the binary before uploading if it is out of
 date.
 
+By default, 'ninja upload' will assume that your Arduino is connected
+as '/dev/ttyACM0'. If your Arduino shows up as a different device,
+you can override the default by setting the meson option 'port', i.e.
+
+    meson --cross-file arduino_uno_cross.txt -Dport=/dev/arduino build
+
 # Porting to other Arduino models
 
 This project hardcodes Arduino Uno. If you have a different model,
 change the compiler specifications and flags in the cross file. There
 does not seem to be a way to easily get these programmatically so you
 have to copy them by hand from Arduino IDE invocations.
-
-The code also assumes a Linux environment and that your Arduino is in
-the serial port `/dev/ttyACM0`. If your setup is different, change the
-program invocations to match.