better neopixel commands for sparse writing

units/neopixel/_npx_api.c

@@ -32,28 +32,16 @@ error_t UU_Npx_Load(Unit *unit, const uint8_t *packed_rgb, uint32_t nbytes)
 }
 
 /* Load U32, LE or BE */
-static error_t load_u32(Unit *unit, const uint8_t *bytes, uint32_t nbytes, bool bige)
+error_t UU_Npx_Load32(Unit *unit, const uint8_t *bytes, uint32_t nbytes, bool order_bgr, bool zero_before)
 {
     CHECK_TYPE(unit, &UNIT_NEOPIXEL);
 
     struct priv *priv = unit->data;
     if (nbytes != 4*priv->cfg.pixels) return E_BAD_COUNT;
-    ws2812_load_sparse(priv->port, priv->ll_pin, bytes, priv->cfg.pixels, bige);
+    ws2812_load_sparse(priv->port, priv->ll_pin, bytes, priv->cfg.pixels, order_bgr, zero_before);
     return E_SUCCESS;
 }
 
-/* Load U32, LE */
-inline error_t UU_Npx_LoadU32LE(Unit *unit, const uint8_t *bytes, uint32_t nbytes)
-{
-    return load_u32(unit, bytes, nbytes, false);
-}
-
-/* Load U32, BE */
-inline error_t UU_Npx_LoadU32BE(Unit *unit, const uint8_t *bytes, uint32_t nbytes)
-{
-    return load_u32(unit, bytes, nbytes, true);
-}
-
 /* Get the pixel count */
 error_t UU_Npx_GetCount(Unit *unit, uint16_t *count)
 {

units/neopixel/unit_neopixel.c

@@ -11,9 +11,11 @@
 enum PinCmd_ {
     CMD_CLEAR = 0,
     CMD_LOAD = 1,
-    CMD_LOAD_U32_LE = 2,
-    CMD_LOAD_U32_BE = 3,
-    CMD_GET_LEN = 4,
+    CMD_LOAD_ZRGB = 0x08, // 0,0 - trail zero, bgr
+    CMD_LOAD_ZBGR = 0x09, // 0,1
+    CMD_LOAD_RGBZ = 0x0A, // 1,0
+    CMD_LOAD_BGRZ = 0x0B, // 1,1
+    CMD_GET_LEN = 0x10,
 };
 
 /** Handle a request message */
@@ -32,15 +34,15 @@ static error_t Npx_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command, Pa
             bytes = pp_tail(pp, &len);
             return UU_Npx_Load(unit, bytes, len);
 
-        /** Load sparse (uint32_t) colors, 0x00RRGGBB, little endian. */
-        case CMD_LOAD_U32_LE:
+        /** Load sparse (uint32_t) colors */
+        case CMD_LOAD_ZRGB:
+        case CMD_LOAD_ZBGR:
+        case CMD_LOAD_RGBZ:
+        case CMD_LOAD_BGRZ:
             bytes = pp_tail(pp, &len);
-            return UU_Npx_LoadU32LE(unit, bytes, len);
-
-        /** Load sparse (uint32_t) colors, 0x00RRGGBB, big endian. */
-        case CMD_LOAD_U32_BE:
-            bytes = pp_tail(pp, &len);
-            return UU_Npx_LoadU32BE(unit, bytes, len);
+            bool trail_zero = (bool) (command & 0b10);
+            bool order_bgr = (bool) (command & 0b01);
+            return UU_Npx_Load32(unit, bytes, len, order_bgr, !trail_zero);
 
         /** Get the Neopixel strip length */
         case CMD_GET_LEN:;

units/neopixel/unit_neopixel.h

@@ -31,26 +31,15 @@ error_t UU_Npx_Clear(Unit *unit);
 error_t UU_Npx_Load(Unit *unit, const uint8_t *packed_rgb, uint32_t nbytes);
 
 /**
- * Load the strip with sparse (uint32_t) colors 0x00RRGGBB as little endian bytes
- * (B, G, R, 0, ...)
- *
+ * Load from 32-bit numbers
  * @param unit
- * @param bytes - bytes to load
- * @param nbytes - number of bytes, must be count*4
+ * @param bytes
+ * @param nbytes
+ * @param order_bgr
+ * @param zero_before
  * @return success
  */
-error_t UU_Npx_LoadU32LE(Unit *unit, const uint8_t *bytes, uint32_t nbytes);
-
-/**
- * Load the strip with sparse (uint32_t) colors 0x00RRGGBB as big endian bytes
- * (0, R, G, B, ...)
- *
- * @param unit
- * @param bytes - bytes to load
- * @param nbytes - number of bytes, must be count*4
- * @return success
- */
-error_t UU_Npx_LoadU32BE(Unit *unit, const uint8_t *bytes, uint32_t nbytes);
+error_t UU_Npx_Load32(Unit *unit, const uint8_t *bytes, uint32_t nbytes, bool order_bgr, bool zero_before);
 
 /**
  * Get number of pixels on the strip

units/neopixel/ws2812.c

@@ -45,13 +45,14 @@ void ws2812_load_raw(GPIO_TypeDef *port, uint32_t ll_pin, const uint8_t *rgbs, u
 }
 
 /** Set many RGBs from uint32 stream */
-void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, const uint8_t *rgbs, uint32_t count, bool bigendian)
+void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, const uint8_t *rgbs, uint32_t count,
+                        bool order_bgr, bool zero_before)
 {
     vPortEnterCritical();
     uint8_t b, g, r;
 	for (uint32_t i = 0; i < count; i++) {
-        if (bigendian) {
-            rgbs++; // skip
+	    if (zero_before) rgbs++; // skip
+        if (order_bgr) {
             b = *rgbs++;
             g = *rgbs++;
             r = *rgbs++;
@@ -59,8 +60,8 @@ void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, const uint8_t *rgbs
             r = *rgbs++;
             g = *rgbs++;
             b = *rgbs++;
-            rgbs++; // skip
         }
+        if (!zero_before) rgbs++; // skip
 
 		ws2812_byte(port, ll_pin, g);
 		ws2812_byte(port, ll_pin, r);

units/neopixel/ws2812.h

@@ -28,8 +28,10 @@ void ws2812_clear(GPIO_TypeDef *port, uint32_t ll_pin, uint32_t count);
  * @param ll_pin
  * @param rgbs - payload
  * @param count - number of pixels
- * @param bigendian - big endian ordering
+ * @param order_bgr - B,G,R colors, false - R,G,B
+ * @param zero_before - insert padding byte before colors, false - after
  */
-void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, const uint8_t *rgbs, uint32_t count, bool bigendian);
+void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, const uint8_t *rgbs, uint32_t count,
+                        bool order_bgr, bool zero_before);
 
 #endif //WS2812_H