diff --git a/platform/platform.c b/platform/platform.c
index 3b478f6..f2f8cfc 100644
--- a/platform/platform.c
+++ b/platform/platform.c
@@ -78,6 +78,7 @@ void plat_init_resources(void)
 
     // Units supported by the platform (known to work correctly)
     // ureg_add_type(&UNIT_XYZ);
+    ureg_add_type(&UNIT_NEOPIXEL);
 
     // Free all present resources
     {
diff --git a/units/neopixel/unit_neopixel.c b/units/neopixel/unit_neopixel.c
index 58320b7..30f9c62 100644
--- a/units/neopixel/unit_neopixel.c
+++ b/units/neopixel/unit_neopixel.c
@@ -145,6 +145,7 @@ enum PinCmd_ {
     CMD_LOAD = 1,
     CMD_LOAD_U32_LE = 2,
     CMD_LOAD_U32_BE = 3,
+    CMD_GET_LEN = 4,
 };
 
 /** Handle a request message */
@@ -174,6 +175,10 @@ static bool Npx_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, Paylo
             ws2812_load_sparse(priv->port, priv->ll_pin, pp->current, priv->pixels, 1);
             break;
 
+        case CMD_GET_LEN:
+            com_respond_u16(frame_id, priv->pixels);
+            break;
+
         default:
             com_respond_bad_cmd(frame_id);
             return false;
diff --git a/units/neopixel/ws2812.c b/units/neopixel/ws2812.c
index 3033db4..6c764d0 100644
--- a/units/neopixel/ws2812.c
+++ b/units/neopixel/ws2812.c
@@ -4,39 +4,26 @@
 static //inline __attribute__((always_inline))
 void ws2812_byte(GPIO_TypeDef *port, uint32_t ll_pin, uint8_t b)
 {
-    __disable_irq();
 	for (register volatile uint8_t i = 0; i < 8; i++) {
         LL_GPIO_SetOutputPin(port, ll_pin);
 
 		// duty cycle determines bit value
 		if (b & 0x80) {
-            for(uint32_t _i = 0; _i < 10; _i++) asm volatile("nop");
+            __delay_cycles(20);
+            //for(uint32_t _i = 0; _i < 10; _i++) asm volatile("nop");
             LL_GPIO_ResetOutputPin(port, ll_pin);
-            for(uint32_t _i = 0; _i < 10; _i++) asm volatile("nop");
+            //for(uint32_t _i = 0; _i < 10; _i++) asm volatile("nop");
+            __delay_cycles(10);
 		} else {
-            for(uint32_t _i = 0; _i < 5; _i++) asm volatile("nop");
+            __delay_cycles(10);
+            //for(uint32_t _i = 0; _i < 5; _i++) asm volatile("nop");
             LL_GPIO_ResetOutputPin(port, ll_pin);
-            for(uint32_t _i = 0; _i < 10; _i++) asm volatile("nop");
+            __delay_cycles(20);
+            //for(uint32_t _i = 0; _i < 10; _i++) asm volatile("nop");
 		}
 
 		b <<= 1; // shift to next bit
 	}
-    __enable_irq();
-}
-
-
-/** Set many RGBs */
-void ws2812_load(GPIO_TypeDef *port, uint32_t ll_pin, uint32_t *rgbs, uint32_t count)
-{
-    vPortEnterCritical();
-	for (uint32_t i = 0; i < count; i++) {
-		uint32_t rgb = *rgbs++;
-        ws2812_byte(port, ll_pin, rgb_g(rgb));
-        ws2812_byte(port, ll_pin, rgb_r(rgb));
-        ws2812_byte(port, ll_pin, rgb_b(rgb));
-	}
-    vPortExitCritical();
-	// TODO: Delay 50 us
 }
 
 /** Set many RGBs from packed stream */
@@ -82,7 +69,6 @@ void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, uint8_t *rgbs, uint
 	// TODO: Delay 50 us
 }
 
-
 /** Set many RGBs */
 void ws2812_clear(GPIO_TypeDef *port, uint32_t ll_pin, uint32_t count)
 {
diff --git a/units/neopixel/ws2812.h b/units/neopixel/ws2812.h
index 40cf55b..0278767 100644
--- a/units/neopixel/ws2812.h
+++ b/units/neopixel/ws2812.h
@@ -1,47 +1,7 @@
-#pragma once
-
-/* Includes ------------------------------------------------------------------*/
-
-#include "main.h"
-
-/* Exported types ------------------------------------------------------------*/
-/* Exported constants --------------------------------------------------------*/
-
-/* Exported macros -----------------------------------------------------------*/
-
-/**
- * @brief Compose an RGB color.
- * @param r, g, b - components 0xFF
- * @returns integer 0xRRGGBB
- */
-#define rgb(r, g, b) (((0xFF & (r)) << 16) | ((0xFF & (g)) << 8) | (0xFF & (b)))
-
-/* Get components */
-#define rgb_r(rgb) (uint8_t)(((rgb) >> 16) & 0xFF)
-#define rgb_g(rgb) (uint8_t)(((rgb) >> 8) & 0xFF)
-#define rgb_b(rgb) (uint8_t)((rgb) & 0xFF)
-
-typedef union {
-    struct {
-        uint8_t r;
-        uint8_t g;
-        uint8_t b;
-    };
-    uint32_t num;
-} xrgb_t;
-
-/* Exported functions --------------------------------------------------------*/
+#ifndef WS2812_H
+#define WS2812_H
 
-
-/**
- * @brief Set color of multiple chained RGB leds
- *
- * @param port
- * @param ll_pin
- * @param rgbs - array of colors (0xRRGGBB)
- * @param count - number of pixels
- */
-void ws2812_load(GPIO_TypeDef *port, uint32_t ll_pin, uint32_t *rgbs, uint32_t count);
+#include "platform.h"
 
 /**
  * Load RGBs from a packed byte stream
@@ -71,3 +31,5 @@ void ws2812_clear(GPIO_TypeDef *port, uint32_t ll_pin, uint32_t count);
  * @param bigendian - big endian ordering
  */
 void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, uint8_t *rgbs, uint32_t count, bool bigendian);
+
+#endif //WS2812_H
diff --git a/utils/cortex_utils.h b/utils/cortex_utils.h
index d4c8fb2..d7ed7cd 100644
--- a/utils/cortex_utils.h
+++ b/utils/cortex_utils.h
@@ -23,4 +23,10 @@ static inline bool isDynAlloc(const void *obj)
            && ((uint32_t)obj < (uint32_t)__SP);
 }
 
+static inline void __delay_cycles(uint32_t cycles)
+{
+    uint32_t l = cycles/3;
+    asm volatile( "0:" "sub %[count], #1;" "bne 0b;" :[count]"+r"(l) );
+}
+
 #endif //GEX_CORTEX_UTILS_H