Add base files and configuration for RGB underglow

app/src/behaviors/behavior_rgb_underglow.c

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2020 Nick Winans <nick@winans.codes>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#define DT_DRV_COMPAT zmk_behavior_rgb_underglow
+
+#include <device.h>
+#include <drivers/behavior.h>
+#include <logging/log.h>
+
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
+struct behavior_rgb_underglow_config { };
+struct behavior_rgb_underglow_data { };
+
+static int behavior_rgb_underglow_init(struct device *dev)
+{
+  return 0;
+}

app/src/rgb_underglow.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2020 Nick Winans <nick@winans.codes>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <device.h>
+#include <init.h>
+
+#include <logging/log.h>
+
+#include <drivers/led_strip.h>
+#include <device.h>
+#include <drivers/spi.h>
+
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
+#define STRIP_LABEL		DT_LABEL(DT_ALIAS(led_strip))
+#define STRIP_NUM_PIXELS	DT_PROP(DT_ALIAS(led_strip), chain_length)
+
+#define DELAY_TIME K_MSEC(50)
+
+#define RGB(_r, _g, _b) { .r = (_r), .g = (_g), .b = (_b) }
+
+static const struct led_rgb colors[] = {
+	RGB(0x0f, 0x00, 0x00), /* red */
+	RGB(0x00, 0x0f, 0x00), /* green */
+	RGB(0x00, 0x00, 0x0f), /* blue */
+};
+
+struct led_rgb pixels[STRIP_NUM_PIXELS];
+
+static void zmk_rgb_underglow_start()
+{
+    struct device *strip;
+	size_t cursor = 0, color = 0;
+	int rc;
+
+	strip = device_get_binding(STRIP_LABEL);
+	if (strip) {
+		LOG_INF("Found LED strip device %s", STRIP_LABEL);
+	} else {
+		LOG_ERR("LED strip device %s not found", STRIP_LABEL);
+		return;
+	}
+
+	LOG_INF("Displaying pattern on strip");
+	while (1) {
+		memset(&pixels, 0x00, sizeof(pixels));
+		memcpy(&pixels[cursor], &colors[color], sizeof(struct led_rgb));
+		rc = led_strip_update_rgb(strip, pixels, STRIP_NUM_PIXELS);
+
+		if (rc) {
+			LOG_ERR("couldn't update strip: %d", rc);
+		}
+
+		cursor++;
+		if (cursor >= STRIP_NUM_PIXELS) {
+			cursor = 0;
+			color++;
+			if (color == ARRAY_SIZE(colors)) {
+				color = 0;
+			}
+		}
+
+		k_sleep(DELAY_TIME);
+	}
+}
+
+static int zmk_rgb_underglow_init(struct device *_arg)
+{
+    zmk_rgb_underglow_start();
+
+    return 0;
+}
+
+SYS_INIT(zmk_rgb_underglow_init,
+        APPLICATION,
+        CONFIG_APPLICATION_INIT_PRIORITY);