samples: led_strip: Extend ws2812 sample with ws2812b_sw support

Add support for building the WS2812 LED strip driver sample against
the new ws2812b_sw driver. Currently a configuration is only provided
for the BBC micro:bit board.

Signed-off-by: Johan Hedberg <[email protected]>

Author: Johan Hedberg

samples/drivers/led_ws2812/boards/96b_carbon.conf

@@ -1,3 +1,10 @@
+CONFIG_POLL=y
+CONFIG_SPI=y
+# CONFIG_SPI_LEGACY_API is not set
+
+CONFIG_WS2812_STRIP=y
+CONFIG_WS2812_STRIP_SPI_DEV_NAME="ws2812_spi"
+
 CONFIG_SPI_STM32=y
 CONFIG_SPI_STM32_INTERRUPT=y
 CONFIG_SPI_2=y

samples/drivers/led_ws2812/boards/bbc_microbit.conf

@@ -0,0 +1,2 @@
+CONFIG_GPIO=y
+CONFIG_WS2812B_SW=y

samples/drivers/led_ws2812/prj.conf

@@ -2,11 +2,5 @@
 
 CONFIG_SYS_LOG=y
 CONFIG_BOOT_BANNER=y
-CONFIG_POLL=y
-
-CONFIG_SPI=y
-# CONFIG_SPI_LEGACY_API is not set
 
 CONFIG_LED_STRIP=y
-CONFIG_WS2812_STRIP=y
-CONFIG_WS2812_STRIP_SPI_DEV_NAME="ws2812_spi"

samples/drivers/led_ws2812/sample.yaml

@@ -4,5 +4,5 @@ sample:
   platforms: all
 tests:
   test:
-    platform_whitelist: 96b_carbon
+    platform_whitelist: 96b_carbon bbc_microbit
     tags: samples

samples/drivers/led_ws2812/src/main.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2017 Linaro Limited
+ * Copyright (c) 2018 Intel Corporation
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -19,10 +20,15 @@
 /*
  * Number of RGB LEDs in the LED strip, adjust as needed.
  */
+#if defined(CONFIG_WS2812_STRIP)
 #define STRIP_NUM_LEDS 12
+#define STRIP_DEV_NAME CONFIG_WS2812_STRIP_NAME
+#else
+#define STRIP_NUM_LEDS 24
+#define STRIP_DEV_NAME CONFIG_WS2812B_SW_NAME
+#endif
 
 #define SPI_DEV_NAME "ws2812_spi"
-#define STRIP_DEV_NAME CONFIG_WS2812_STRIP_NAME
 #define DELAY_TIME K_MSEC(40)
 
 static const struct led_rgb colors[] = {
@@ -52,8 +58,10 @@ const struct led_rgb *color_at(size_t time, size_t i)
 
 void main(void)
 {
-	struct device *spi, *strip;
+	struct device *strip;
 	size_t i, time;
+#if defined(CONFIG_SPI)
+	struct device *spi;
 
 	/* Double-check the configuration. */
 	spi = device_get_binding(SPI_DEV_NAME);
@@ -65,6 +73,8 @@ void main(void)
 			    SPI_DEV_NAME);
 		return;
 	}
+#endif
+
 	strip = device_get_binding(STRIP_DEV_NAME);
 	if (strip) {
 		SYS_LOG_INF("Found LED strip device %s", STRIP_DEV_NAME);