RP2040: Get WS2812 LEDs working

CHANGELOG.md

@@ -14,6 +14,9 @@
   - 3.0+ version of the ESP32 Arduino Core now required.
   - USB-CDC (aka native USB) appears to be broken in the 3.0 core. Will eventually hang if sending a lot of data both directions at the same time. Use one of the standard UART interfaces until this is fixed.
 
+- Raspberry Pi Pico (RP2040)
+  - WS2812 LED strips work now.
+
 ### New Peripherals
 
 - ADS1100 Analog-to-Digital Converter:

DEPS_CLI.md

@@ -84,4 +84,5 @@ arduino-cli config add board_manager.additional_urls https://github.com/earlephi
 arduino-cli core update-index
 arduino-cli core install rp2040:rp2040
 arduino-cli lib install [email protected]
+arduino-cli lib install "Adafruit NeoPixel"
 ````

HARDWARE.md

@@ -72,7 +72,7 @@
 
 |    Chip        | Status          | Board Tested          | Notes |
 | :--------      | :------:        | :---------------      |------ |
-| RP2040         | :green_heart:   | Raspberry Pi Pico (W) | WiFi only on W version. No WS1812 LED support.
+| RP2040         | :green_heart:   | Raspberry Pi Pico (W) |
 
 # Single Board Computers
 
@@ -102,7 +102,7 @@ See the [Support](https://github.com/denko-rb/denko-piboard?tab=readme-ov-file#s
 | Maxim OneWire         | :green_heart:   | S     | `OneWire::Bus`           | No overdrive
 | Infrared Emitter      | :green_heart:   | S     | `PulseIO::IRTransmitter` | Except SAM3X, RA4M1
 | Infrared Receiver     | :heart:         | S     | `PulseIO::IRReceiver`    | Doable with existing library
-| WS2812                | :green_heart:   | S     | See LED table            | Except RP2040, RA4M1
+| WS2812                | :green_heart:   | S     | See LED table            | Except RA4M1
 | ESP32-PCNT            | :heart:         | H     | -                        | Only ESP32. Pulse counter (for encoders)
 | ESP32-MCPWM           | :heart:         | H     | -                        | Only ESP32. Motor control PWM
 

lib/denko_cli/targets.rb

@@ -28,6 +28,6 @@ class DenkoCLI::Generator
     esp32:   STANDARD_PACKAGES,
 
     # RP2040 can't use WS2812 yet.
-    rp2040: STANDARD_PACKAGES - [:led_array],
+    rp2040: STANDARD_PACKAGES,
   }
 end

src/lib/DenkoLEDArray.cpp

@@ -13,6 +13,10 @@
   #ifdef ESP32
     #include <esp.c>
   #endif
+
+  #ifdef ARDUINO_ARCH_RP2040
+    Adafruit_NeoPixel ledArray;
+  #endif
 #endif
 
 //
@@ -32,7 +36,14 @@ void Denko::showLEDArray() {
   #ifdef ESP32
     espShow(pin, &auxMsg[WS2812_DATA_OFFSET], val, true);
 
-  // memcpy method for everything else.
+  // Pre-init instance (one PIO) on Pi Pico.
+  #elif defined(ARDUINO_ARCH_RP2040)
+    ledArray.setPin(pin);
+    ledArray.updateLength(val);
+    memcpy(ledArray.getPixels(), &auxMsg[WS2812_DATA_OFFSET], val);
+    ledArray.show();
+
+  // Reinit and memcpy for everything else.
   #else
     // Setup a new LED array object.
     Adafruit_NeoPixel ledArray(val, pin, NEO_GRB + NEO_KHZ800);