Update

attiny1616-dev-board/firmware/t1616-starter/.gitignore

@@ -0,0 +1,5 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

attiny1616-dev-board/firmware/t1616-starter/.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

attiny1616-dev-board/firmware/t1616-starter/platformio.ini

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+[env]
+platform = atmelmegaavr
+framework = arduino
+monitor_speed = 115200
+monitor_port = /dev/ttyUSB1
+upload_port = /dev/ttyUSB0
+board_build.f_cpu = 20000000ul
+build_flags =
+    -D ws2812_port=A
+    -D ws2812_pin=7
+lib_deps = 
+  SPI
+  adafruit/Adafruit NeoPixel @ 1.10.7
+
+[env:tiny1616-jtag2updi]
+board = ATtiny1616
+upload_protocol = jtag2updi
+
+[env:tiny1616-serialupdi]
+board = ATtiny1616
+upload_speed = 230400
+upload_flags =
+    --tool
+    uart
+    --device
+    attiny1616
+    --uart
+    $UPLOAD_PORT
+    --clk
+    $UPLOAD_SPEED
+upload_command = pymcuprog write --erase $UPLOAD_FLAGS --filename $SOURCE

attiny1616-dev-board/firmware/t1616-starter/src/main.cpp

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+#include <Arduino.h>
+#include <Adafruit_NeoPixel.h>
+
+#define PIN_LED PIN_PB4 // 5
+#define PIN_RGB PIN_PA7
+#define PIN_BTN PIN_PA0
+
+uint8_t seq = 0;
+
+Adafruit_NeoPixel pixels(1, PIN_RGB, NEO_GRB + NEO_KHZ800);
+
+void setup() {
+
+  pinMode(PIN_LED, OUTPUT);
+  pinMode(PIN_BTN, INPUT);
+
+  delay(1000);
+  Serial.begin(115200);
+  Serial.printf("Started at %d MHz\n", F_CPU);
+
+  pixels.begin();
+}
+
+uint8_t btn_state = HIGH;
+
+void loop() {
+  seq++;
+
+  Serial.print('.');
+
+  if (btn_state != digitalRead(PIN_BTN)) {
+    btn_state = !btn_state;
+    Serial.print("Button state is ");
+    Serial.println(btn_state);
+  }
+
+  digitalWrite(PIN_LED, seq % 2);
+
+  pixels.clear();
+  if (seq % 2 == 0)
+    pixels.setPixelColor(0, pixels.Color((0xff - seq) % 0xff, seq % 0xff, seq % 0x7f + (0xff - seq) % 0x7f));
+  pixels.show();
+
+  delay(500);
+}