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Document and auto-build SAMD21 port #182

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Merged
merged 4 commits into from
Apr 11, 2023
Merged

Document and auto-build SAMD21 port #182

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4224d0a
Add SAMD auto-builds
tfry-git Apr 11, 2023
b449c21
Add documentation for SAMD port
tfry-git Apr 11, 2023
e1dd226
Built on a board with a DAC
tfry-git Apr 11, 2023
982e7a3
Fix board id
tfry-git Apr 11, 2023
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4 changes: 4 additions & 0 deletions .github/workflows/compile_examples.yml
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Expand Up @@ -41,6 +41,10 @@ jobs:
platforms: |
- name: esp8266:esp8266
source-url: https://arduino.esp8266.com/stable/package_esp8266com_index.json
# SAMD boards. There is also an Adrafruit fork of this core, and the two seem to have diverged, considerably. I have no idea on the differences.
- fqbn: arduino:samd:adafruit_circuitplayground_m0
platforms: |
- name: arduino:samd

steps:
- name: Checkout repository
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2 changes: 1 addition & 1 deletion MozziGuts_impl_SAMD.hpp
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Expand Up @@ -123,7 +123,7 @@ static void startAudio() {
}

#endif
analogWriteResolution(10);
analogWriteResolution(AUDIO_BITS);
#if (EXTERNAL_AUDIO_OUTPUT != true)
analogWrite(AUDIO_CHANNEL_1_PIN, 0);
#endif
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8 changes: 8 additions & 0 deletions README.md
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Expand Up @@ -230,6 +230,14 @@ Some of the differences for Teensy 4.*:

- Contrary to the Teensy 3, the Teensy 4 do not have any DAC. The output is done on pin A8 (PWM) by default (editable in `AudioConfigTeensy4.h`

### SAMD21 architecture (Arduino Circuitplayground M0 and others)
port by Adrian Freed

- Currently, only output on the inbuilt DAC (pin DAC0) is supported. So, obviously, boards without a DAC are not yet convered (in theory you can still use EXTERNAL_AUDIO_OUTPUT)
- Output resolution is fixed at 10 bits. If your board supports more, configure in AudioConfigSAMD21.h
- mozziAnalogRead() and AUDIO_INPUT are not implemented (contributions welcome)
- We don't have a lot of data, which boards this port has been tested on. Success or not, let us know, if you are using Mozzi on SAMD21 boards

### ESP8266
port by Thomas Friedrichsmeier

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