allow setting samplerate and blocksize for Daisy using meta info (#133)

* allow setting samplerate and blocksize for Daisy using meta info

* add sr/bs to Daisy docs

* mention max blocksize; clamp blocksize between 1 and 256

* reword Daisy docs

CHANGELOG.md

@@ -6,6 +6,7 @@ Next Release
 
 * Objects: `[bang~]`
 * Documentation fixes/additions
+* Daisy: ability to set samplerate and blocksize
 * DPF: enum for UI parameter IDs
 * DPF bugfixes: correct input PortGroup names
 

docs/03.gen.daisy.md

@@ -4,13 +4,13 @@ Daisy is an embedded platform for music. It features everything you need for cre
 
 Currently daisy platform is supported for:
 
-* `field`
 * `seed`
 * `pod`
 * `petal`
 * `patch`
 * `patch_init`
 * `patch_sm`
+* `field`
 
 Which can be configured using the `-m` metadata.json `daisy.board` setting:
 
@@ -65,3 +65,18 @@ Printing to serial console can be enabled using the `debug_printing` flag in the
 ```
 
 This will increase the program size with a few kb and will disable `usb_midi` as we currently do not have composite USB device yet.
+
+## Custom samplerate and blocksize
+
+This can be done by adding either to the meta.json:
+
+```json
+{
+    "daisy": {
+        "samplerate": 96000,
+        "blocksize": 128
+    }
+}
+```
+
+Do note that the samplerate will be automatically set to either 16k, 32k, 48k, or 96k. Blocksize will need to be 256 or less and is automatically capped.

hvcc/generators/c2daisy/c2daisy.py

@@ -84,9 +84,17 @@ def compile(
             component_glue['header'] = f"HeavyDaisy_{patch_name}.hpp"
             component_glue['max_channels'] = board_info['channels']
             component_glue['num_output_channels'] = num_output_channels
+            component_glue['has_midi'] = board_info['has_midi']
             component_glue['debug_printing'] = daisy_meta.get('debug_printing', False)
             component_glue['usb_midi'] = daisy_meta.get('usb_midi', False)
-            component_glue['has_midi'] = board_info['has_midi']
+            component_glue['samplerate'] = daisy_meta.get('samplerate')
+
+            blocksize = daisy_meta.get('blocksize')
+
+            if blocksize:
+                component_glue['blocksize'] = max(min(256, blocksize), 1)
+            else:
+                component_glue['blocksize'] = None
 
             component_glue['copyright'] = copyright_c
 

hvcc/generators/c2daisy/templates/HeavyDaisy.cpp

@@ -153,6 +153,12 @@ void HandleMidiMessage(MidiEvent m)
 int main(void)
 {
   hardware.Init(true);
+  {% if samplerate is not none %}
+  hardware.SetAudioSampleRate({{samplerate}});
+  {% endif %}
+  {% if blocksize is not none %}
+  hardware.SetAudioBlockSize({{blocksize}});
+  {% endif %}
   {% if has_midi %}
   MidiUartHandler::Config midi_config;
   hardware.midi.Init(midi_config);