Fix MicroPython and busio

[Adafruit_Blinka-hackapet.git] / src / adafruit_blinka / microcontroller / rp2040 / uart.py

diff --git a/src/adafruit_blinka/microcontroller/rp2040/uart.py b/src/adafruit_blinka/microcontroller/rp2040/uart.py
new file mode 100644 (file)
index 0000000..a233b8e
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/rp2040/uart.py
@@ -0,0 +1,48 @@
+"""UART Class for RP2040"""
+from machine import UART as _UART
+from machine import Pin
+from microcontroller.pin import uartPorts
+
+# pylint: disable=protected-access, no-self-use
+class UART:
+    """Custom UART Class for RP2040"""
+
+    # pylint: disable=too-many-arguments
+    def __init__(self, tx, rx, baudrate=9600, bits=8, parity=None, stop=1):
+        # check tx and rx have hardware support
+        for portId, txPin, rxPin in uartPorts:
+            if txPin == tx and rxPin == rx:
+                self._uart = _UART(
+                    portId,
+                    baudrate,
+                    bits=bits,
+                    parity=parity,
+                    stop=stop,
+                    tx=Pin(txPin.id),
+                    rx=Pin(rxPin.id),
+                )
+                break
+        else:
+            raise ValueError(
+                "No Hardware UART on (tx,rx)={}\nValid UART ports: {}".format(
+                    (tx.id, rx.id), uartPorts
+                )
+            )
+
+    # pylint: enable=too-many-arguments
+
+    def read(self, nbytes=None):
+        """Read from the UART"""
+        return self._uart.read(nbytes)
+
+    def readinto(self, buf, nbytes=None):
+        """Read from the UART into a buffer"""
+        return self._uart.readinto(buf, nbytes)
+
+    def readline(self):
+        """Read a line of characters up to a newline charater from the UART"""
+        return self._uart.readline()
+
+    def write(self, buf):
+        """Write to the UART from a buffer"""
+        return self._uart.write(buf)