There are two ways you can run Pd patches on Bela: using Enzien Audio's Heavy Audio Tools or using libpd. Libpd is a GUI-less version of Pd which allows to embed Pd patches into other programs, whereas Heavy is an online service that generates highly-optimized C code from a Pd patch. Libpd runs all of Pd vanilla objects, almost all of of which are supported on Bela. Pd patches compiled with Heavy can only contain a susbet of Pd vanilla objects. Using libpd, a patch can be run immediately, as soon as it is copied over to the Beaglebone. When using Heavy, you have to re-compile the patch every time you modify it, which may take up to one minute and requires an internet connection. In turn, code generated by Heavy runs much faster than libpd, especially when compiled with Clang. ![]() ![]() The inputs and outputs are handled the same way for both Heavy and libpd. In both cases, you need to have a file called _main.pd in your project folder, which is the patch that will be opened by the program, so this file should be the one which invokes your abstraction files. Using analog ins/outs • You can directly address the analog ins and outs from within PD (note that you have to compile and run the patch onto the BeagleBone to receive the data) • Use the [adc~] and [dac~] objects to receive and send the data • [adc~ 3] refers to Analog Input 0 (first two channels of [adc~] are audio inputs), likewise for [dac~] • These inputs are sampled at audio sampling rate, so handle them as you would audio signals. (Use [snapshot~] if you want to turn them into control-rate values). When the analog channels are sampled at a different rate than the audio, they are resampled automatically in the wrapper. Pure Data (sudo apt-get install --no-install-recommends puredata gem) VNC if not using monitor. Basic.pd should appear on the top left corner of the screen as an empty Pure Data patch. Step 03: Get the Virtual MIDI keyboard in the App to appear. For example the Properties window of Volume looks like this: image.png 733x1097 47.8 KB. • Note that analog inputs and outputs have a range between 0 and 1, unlike regular audio signals which have a range between -1 and 1. • See the example patches in the /puredata folder for more information Using Digital I/O • Bela's digital inputs and outputs can be addressed from pd. They can either be received as messages at message rate or as signals. Unlike analog channels, each digital pin can function as an input or an output - this needs to be set explicitly from within the patch. • Before using digital I/O the pins need to be initialised by sending messages to the bela_setDigital @hv_param receiver. • To set a pin to be an input or output at message rate the following message needs to be passed to the receiver: [PINMODE PIN#(, where PINMODE is in for input or out for output. The pin numbers PIN# range from 11-26, where 11 refers to digital pin 0 and 26 refers to digital pin 15. The reason for this numbering scheme is to retain consistency with the [adc~] and [dac~] numberings used. To set a pin to be received or written to at audio rate a tilde (~) is added as a third component of the message. To disable a pin the message [disable PIN#( can be sent to the receiver. See the following screenshot for example usage: • If a pin is set to message rate, messages will only be received or written when the pin's value changes. If audio rate is specified, values are treated as a signal where values can change between low and high (0 and 1) 44100 times per second. Use [adc~] and [dac~] channels 11-26 to address the corresponding pin (after it has been initialised). • See the digital example inside the Puredata examples folder for more information and practical examples. Using MIDI input Most class-compliant USB MIDI devices are compatible with Bela. You can use the [notein] and [ctlin] objects to receive midinote and CC messages from the device. See the hello-midi example inside the Puredata examples folder for more information. Using an externals folder If you want to use abstractions or externals with your Pd patch then the easiest way to do this is to simply include the abstractions in the project folder. If you want abstractions to be accessible from all Pd patches that you create (like setting the path for externals in regular Pd) then this can be done by creating a folder that contains your externals here: /root/Bela/projects/pd-externals. The default search path for a project is the one you find in: '.' (current folder) and './pd-externals/', which is the folder /root/Bela/projects/pd-externals. This means that if you put something in either of those folders, your program will be able to open it. The pd-externals folder does not exist by default, so you will need to create it if you want globally available externals. To learn more about compiling pd-extended externals for Bela see. Libpd Libpd on Bela is a port of the original libpd with a few minor modifications to make it run smoothly in Bela's Xenomai environment. Libpd patches can be compiled from the IDE or from the command line using the supplied. 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