Add support for .side_set ... pindirs

This also requires a core change to set the respective bit in the
PIO hardware.

adafruit_pioasm.py

@@ -73,6 +73,7 @@ def __init__(self, text_program: str, *, build_debuginfo: bool = False) -> None:
         instructions: List[str] = []
         sideset_count = 0
         sideset_enable = 0
+        sideset_pindirs = False
         wrap = None
         wrap_target = None
         offset = -1
@@ -144,6 +145,7 @@ def parse_rxfifo_brackets(arg, fifo_dir):
             elif line.startswith(".side_set"):
                 sideset_count = int(line.split()[1], 0)
                 sideset_enable = "opt" in line
+                sideset_pindirs = "pindirs" in line
             elif line.startswith(".fifo"):
                 require_before_instruction()
                 fifo_type = line.split()[1]
@@ -470,6 +472,8 @@ def parse_rxfifo_brackets(arg, fifo_dir):
 
         if sideset_count != 0:
             self.pio_kwargs["sideset_pin_count"] = sideset_count
+        if sideset_pindirs:
+            self.pio_kwargs["sideset_pindirs"] = sideset_pindirs
 
         if wrap is not None:
             self.pio_kwargs["wrap"] = wrap

tests/test_pseudo.py

@@ -12,3 +12,20 @@
 def test_offset() -> None:
     assert_pio_kwargs(".origin 7", offset=7, sideset_enable=False)
     assert_assembly_fails("nop\n.origin 7")
+
+
+def test_sideset_pindirs() -> None:
+    assert_pio_kwargs(
+        ".side_set 2 opt pindirs",
+        sideset_pin_count=2,
+        sideset_enable=True,
+        sideset_pindirs=True,
+    )
+    assert_pio_kwargs(
+        ".side_set 2 pindirs",
+        sideset_pin_count=2,
+        sideset_enable=False,
+        sideset_pindirs=True,
+    )
+    # Setting not emitted (as =False) for backwards compat
+    assert_pio_kwargs(".side_set 2", sideset_pin_count=2, sideset_enable=False)