drivers/ws281x: added arm backend, leveraging the light_ws2812 package

drivers/ws281x/Kconfig

@@ -7,12 +7,13 @@
 
 config MODULE_WS281X
     bool "WS2812/SK6812 RGB LED (NeoPixel)"
-    depends on HAS_CPU_CORE_ATMEGA || HAS_ARCH_ESP32 || HAS_ARCH_NATIVE
+    depends on HAS_CPU_CORE_ATMEGA || HAS_ARCH_ESP32 || HAS_ARCH_NATIVE || HAS_ARCH_ARM
     depends on TEST_KCONFIG
     select MODULE_XTIMER
     select MODULE_WS281X_ATMEGA if HAS_CPU_CORE_ATMEGA
     select MODULE_WS281X_VT100 if HAS_ARCH_NATIVE
     select MODULE_WS281X_ESP32 if HAS_ARCH_ESP32
+    select MODULE_WS281X_ARM if HAS_ARCH_ARM
 
 config MODULE_WS281X_ATMEGA
     bool
@@ -25,3 +26,7 @@ config MODULE_WS281X_VT100
 config MODULE_WS281X_ESP32
     bool
     depends on HAS_ARCH_ESP32
+
+config MODULE_WS281X_ARM
+    bool
+    depends on HAS_ARCH_ARM

drivers/ws281x/Makefile.dep

@@ -1,4 +1,4 @@
-FEATURES_REQUIRED_ANY += cpu_core_atmega|arch_esp32|arch_native
+FEATURES_REQUIRED_ANY += cpu_core_atmega|arch_esp32|arch_native|arch_arm
 
 ifeq (,$(filter ws281x_%,$(USEMODULE)))
   ifneq (,$(filter cpu_core_atmega,$(FEATURES_USED)))
@@ -10,6 +10,10 @@ ifeq (,$(filter ws281x_%,$(USEMODULE)))
   ifneq (,$(filter arch_esp32,$(FEATURES_USED)))
     USEMODULE += ws281x_esp32
   endif
+  ifneq (,$(filter arch_arm,$(FEATURES_USED)))
+    USEMODULE += ws281x_arm
+    USEPKG += light_ws2812
+  endif
 endif
 
 ifneq (,$(filter ws281x_atmega,$(USEMODULE)))

drivers/ws281x/arm.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2022 BISSELL Homecare, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_ws281x
+ *
+ * @{
+ *
+ * @file
+ * @brief       Implementation of `ws281x_write_buffer()` for the ARM CPU
+ *
+ * @author      David VanKampen <[email protected]>
+ *
+ * @}
+ */
+#include <assert.h>
+#include <errno.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "ws281x.h"
+#include "ws281x_params.h"
+#include "ws281x_constants.h"
+
+#include "light_ws2812_cortex.h"
+
+
+void ws281x_write_buffer(ws281x_t *dev, const void *buf, size_t size)
+{
+    assert(dev);
+    ws2812_sendarray((uint8_t*)buf, size);
+}

drivers/ws281x/include/ws281x_backend.h

@@ -51,6 +51,15 @@ extern "C" {
 #endif
 /** @} */
 
+
+/**
+ * @name    Properties of the ARM backend.
+ * @{
+ */
+#ifdef MODULE_WS281X_ARM
+#endif
+/** @} */
+
 #ifdef __cplusplus
 }
 #endif