first and compiling freertos

docs/examples/ws2812b/RP2040-ETH-WS2812B/Python/RP2040-ETH-WS2812B.py

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+import time
+from machine import Pin
+import rp2
+
+max_lum =100
+r=0
+g=0
+b=0
+
+@rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=24)
+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()
+
+
+# Create the StateMachine with the ws2812 program, outputting on Pin(4).
+sm = rp2.StateMachine(0, ws2812, freq=8_000_000, sideset_base=Pin(25))
+
+# Start the StateMachine, it will wait for data on its FIFO.
+sm.active(1)
+
+# Color change
+while True:
+    for i in range(0,max_lum):
+        r=i
+        b=max_lum-i
+        rgb =(g<<24) | (r<<16) | (b<<8)
+        sm.put(rgb)
+        time.sleep_ms(10)
+    time.sleep_ms(300)
+    for i in range(0,max_lum):
+        g=i
+        r=max_lum-i
+        rgb =(g<<24) | (r<<16) | (b<<8)
+        sm.put(rgb)
+        time.sleep_ms(10)
+    time.sleep_ms(300)
+    for i in range(0,max_lum):
+        b=i
+        g=max_lum-i
+        rgb =(g<<24) | (r<<16) | (b<<8)
+        sm.put(rgb)
+        time.sleep_ms(10)
+    time.sleep_ms(300)