diff --git a/pico/lib/dma.py b/pico/lib/dma.py
index 1abb96f..04abead 100644
--- a/pico/lib/dma.py
+++ b/pico/lib/dma.py
@@ -93,9 +93,8 @@ class PIO_DMA_Transfer():
         self.dma_chan.CTRL_TRIG.INCR_WRITE = 0
         self.dma_chan.CTRL_TRIG.INCR_READ = 1
             
-    def start_transfer(self, buffer, offset=0):
-        """Start DMA from buffer at byte offset (no copy; DMA reads from buffer + offset)."""
-        self.dma_chan.READ_ADDR_REG = uctypes.addressof(buffer) + offset
+    def start_transfer(self, buffer):
+        self.dma_chan.READ_ADDR_REG = uctypes.addressof(buffer)
         self.dma_chan.CTRL_TRIG.EN = 1
 
     def transfer_count(self):
diff --git a/pico/lib/ws2812.py b/pico/lib/ws2812.py
index 99a77e8..5d0b865 100644
--- a/pico/lib/ws2812.py
+++ b/pico/lib/ws2812.py
@@ -1,83 +1,68 @@
-
-import array, time
-from machine import Pin
-import rp2
-from time import sleep
-import dma
-
-@rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=8)
-def ws2812():
-    T1 = 2
-    T2 = 5
-    T3 = 3
-    wrap_target()
-    label("bitloop")
-    out(x, 1)               .side(0)    [T3 - 1]
-    jmp(not_x, "do_zero")   .side(1)    [T1 - 1]
-    jmp("bitloop")          .side(1)    [T2 - 1]
-    label("do_zero")
-    nop()                   .side(0)    [T2 - 1]
-    wrap()
-
-class WS2812B:
-    BLACK = (0, 0, 0)
-    RED = (255, 0, 0)
-    YELLOW = (255, 150, 0)
-    GREEN = (0, 255, 0)
-    CYAN = (0, 255, 255)
-    BLUE = (0, 0, 255)
-    PURPLE = (180, 0, 255)
-    WHITE = (255, 255, 255)
-    COLORS = (BLACK, RED, YELLOW, GREEN, CYAN, BLUE, PURPLE, WHITE)
-
-    def __init__(self, num_leds, pin, state_machine, brightness=0.1):
-        self.sm = rp2.StateMachine(state_machine, ws2812, freq=8_000_000, sideset_base=Pin(pin))
-        self.sm.active(1)
-        self.ar = bytearray(num_leds * 3)
-        self.num_leds = num_leds
-        self.brightness = brightness
-        self.pio_dma = dma.PIO_DMA_Transfer(state_machine, state_machine, 8, num_leds * 3)
-        # Pre-built bytearrays, one per color (GRB, brightness applied) for fast show
-        self.color_buffers = [self._color_to_buffer(c) for c in self.COLORS]
-
-    def _color_to_buffer(self, color):
-        """One bytearray of length num_leds*3, all pixels same color (GRB)."""
-        r, g, b = color[0], color[1], color[2]
-        g = int(g * self.brightness) & 0xFF
-        r = int(r * self.brightness) & 0xFF
-        b = int(b * self.brightness) & 0xFF
-        return bytearray([g, r, b] * self.num_leds)
-
-    def show(self, buffer=None, offset=0):
-        """Push buffer to PIO via DMA. If buffer is None, use self.ar (offset must be 0).
-        With offset, DMA reads directly from buffer[offset:offset+num_leds*3]; no copy."""
-        buf = buffer if buffer is not None else self.ar
-        self.pio_dma.start_transfer(buf, offset)
-
-    def show_color(self, color_index):
-        """Show pre-built buffer for COLORS[color_index]. No fill() needed."""
-        self.show(self.color_buffers[color_index])
-
-    def set(self, i, color):
-        self.ar[i*3] = int(color[1]*self.brightness)
-        self.ar[i*3+1] = int(color[0]*self.brightness)
-        self.ar[i*3+2] = int(color[2]*self.brightness)
-
-    def fill(self, color):
-        for i in range(self.num_leds):
-            self.set(i, color)
-
-    def busy(self):
-        return self.pio_dma.busy()
-
-if __name__ == "__main__":
-    num_leds, pin, sm, brightness = 10, 2, 0, 1
-    ws0 = WS2812B(num_leds, pin, sm, brightness)
-    while True:
-        for color in ws0.COLORS:
-            ws0.fill(color)
-            ws0.show()
-            time.sleep(1)
-
-
-
+
+import array, time
+from machine import Pin
+import rp2
+from time import sleep
+import dma
+
+@rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=8)
+def ws2812():
+    T1 = 2
+    T2 = 5
+    T3 = 3
+    wrap_target()
+    label("bitloop")
+    out(x, 1)               .side(0)    [T3 - 1]
+    jmp(not_x, "do_zero")   .side(1)    [T1 - 1]
+    jmp("bitloop")          .side(1)    [T2 - 1]
+    label("do_zero")
+    nop()                   .side(0)    [T2 - 1]
+    wrap()
+
+class WS2812B: 
+    def __init__(self, num_leds, pin, state_machine, brightness=0.1, invert=False):
+        self.sm = rp2.StateMachine(state_machine, ws2812, freq=8_000_000, sideset_base=Pin(pin))
+        self.sm.active(1)
+        self.ar = bytearray(num_leds*3)
+        self.num_leds = num_leds
+        self.brightness = brightness
+        self.invert = invert
+        self.pio_dma = dma.PIO_DMA_Transfer(state_machine+4, state_machine, 8, num_leds*3)
+
+    def show(self):
+        self.pio_dma.start_transfer(self.ar)
+        
+    def set(self, i, color):
+        self.ar[i*3] = int(color[1]*self.brightness)
+        self.ar[i*3+1] = int(color[0]*self.brightness)
+        self.ar[i*3+2] = int(color[2]*self.brightness)
+    
+    def fill(self, color):
+        for i in range(self.num_leds):
+            self.set(i, color)
+
+    def busy(self):
+        return self.pio_dma.busy()
+    
+    BLACK = (0, 0, 0)
+    RED = (255, 0, 0)
+    YELLOW = (255, 150, 0)
+    GREEN = (0, 255, 0)
+    CYAN = (0, 255, 255)
+    BLUE = (0, 0, 255)
+    PURPLE = (180, 0, 255)
+    WHITE = (255, 255, 255)
+    COLORS = (BLACK, RED, YELLOW, GREEN, CYAN, BLUE, PURPLE, WHITE)
+
+if __name__ == "__main__":
+    num_leds, pin, sm, brightness = 293, 2, 0, 0.1
+    ws0 = WS2812B(num_leds, pin, sm, brightness)
+    while True:
+        for color in ws0.COLORS:
+            ws0.fill(color)
+            ws0.show()
+            time.sleep(1)
+
+
+
+