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[Adafruit_Blinka-hackapet.git] / src / adafruit_blinka / microcontroller / generic_linux / spi.py

diff --git a/src/adafruit_blinka/microcontroller/generic_linux/spi.py b/src/adafruit_blinka/microcontroller/generic_linux/spi.py
index 58a465db727588abb1b758c1c5987292e1f30f3c..6cce03700b5634a11281e75bbf9301b1b407f225 100755 (executable)
--- a/src/adafruit_blinka/microcontroller/generic_linux/spi.py
+++ b/src/adafruit_blinka/microcontroller/generic_linux/spi.py
@@ -1,8 +1,14 @@
-import spidev
-import time
+# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+"""Generic Linux SPI class using PureIO's SPI class"""
+from Adafruit_PureIO import spi

 from adafruit_blinka.agnostic import detector
 
 from adafruit_blinka.agnostic import detector
 

+

 class SPI:
 class SPI:

+    """SPI Class"""
+

     MSB = 0
     LSB = 1
     CPHA = 1
     MSB = 0
     LSB = 1
     CPHA = 1


@@ -13,92 +19,125 @@ class SPI:
     bits = 8
 
     def __init__(self, portid):
     bits = 8
 
     def __init__(self, portid):

-        self._port = portid
-        self._spi = spidev.SpiDev()
+        if isinstance(portid, tuple):
+            self._spi = spi.SPI(device=portid)
+        else:
+            self._spi = spi.SPI(device=(portid, 0))
+        self.clock_pin = None
+        self.mosi_pin = None
+        self.miso_pin = None
+        self.chip = None

 
 

-    def init(self, baudrate=100000, polarity=0, phase=0, bits=8,
-                  firstbit=MSB, sck=None, mosi=None, miso=None):
+    # pylint: disable=too-many-arguments,unused-argument
+    def init(
+        self,
+        baudrate=100000,
+        polarity=0,
+        phase=0,
+        bits=8,
+        firstbit=MSB,
+        sck=None,
+        mosi=None,
+        miso=None,
+    ):
+        """Initialize SPI"""

         mode = 0
         if polarity:
             mode |= self.CPOL
         if phase:
             mode |= self.CPHA
         mode = 0
         if polarity:
             mode |= self.CPOL
         if phase:
             mode |= self.CPHA

-
-        self.clock_pin = sck
-        self.mosi_pin = mosi
-        self.miso_pin = miso

         self.baudrate = baudrate
         self.mode = mode
         self.bits = bits
         self.chip = detector.chip
 
         self.baudrate = baudrate
         self.mode = mode
         self.bits = bits
         self.chip = detector.chip
 

+        # Pins are not used
+        self.clock_pin = sck
+        self.mosi_pin = mosi
+        self.miso_pin = miso
+
+    # pylint: enable=too-many-arguments,unused-argument
+
+    # pylint: disable=unnecessary-pass

     def set_no_cs(self):
     def set_no_cs(self):

-        # Linux SPI driver for AM33XX chip in BeagleBone and PocketBeagle
-        # does not support setting SPI_NO_CS mode bit (issue #104)
-        if not self.chip.AM33XX and not self.chip.IMX8MX and not self.chip.SAMA5 \
-         and not self.chip.APQ8016 and not self.chip.T210 and not self.chip.T186 \
-         and not self.chip.T194:
-            try:
-                self._spi.no_cs = True  # this doesn't work but try anyways
-            except AttributeError:
-                pass
+        """Setting so that SPI doesn't automatically set the CS pin"""
+        # No kernel seems to support this, so we're just going to pass
+        pass
+
+    # pylint: enable=unnecessary-pass
+
+    @property
+    def frequency(self):
+        """Return the current baudrate"""
+        return self.baudrate

 
     def write(self, buf, start=0, end=None):
 
     def write(self, buf, start=0, end=None):

-        if not buf:
+        """Write data from the buffer to SPI"""
+        if buf is None or len(buf) < 1:

             return
         if end is None:
             end = len(buf)
         try:
             return
         if end is None:
             end = len(buf)
         try:

-            self._spi.open(self._port, 0)
+            # self._spi.open(self._port, 0)

             self.set_no_cs()
             self._spi.max_speed_hz = self.baudrate
             self._spi.mode = self.mode
             self._spi.bits_per_word = self.bits
             self.set_no_cs()
             self._spi.max_speed_hz = self.baudrate
             self._spi.mode = self.mode
             self._spi.bits_per_word = self.bits

-            self._spi.writebytes2(buf[start:end])
-            self._spi.close()
-        except FileNotFoundError as not_found:
+            self._spi.writebytes(buf[start:end])
+            # self._spi.close()
+        except FileNotFoundError:

             print("Could not open SPI device - check if SPI is enabled in kernel!")
             raise
 
     def readinto(self, buf, start=0, end=None, write_value=0):
             print("Could not open SPI device - check if SPI is enabled in kernel!")
             raise
 
     def readinto(self, buf, start=0, end=None, write_value=0):

-        if not buf:
+        """Read data from SPI and into the buffer"""
+        if buf is None or len(buf) < 1:

             return
         if end is None:
             end = len(buf)
         try:
             return
         if end is None:
             end = len(buf)
         try:

-            self._spi.open(self._port, 0)
-            self.set_no_cs()
+            # self._spi.open(self._port, 0)
+            # self.set_no_cs()

             self._spi.max_speed_hz = self.baudrate
             self._spi.mode = self.mode
             self._spi.bits_per_word = self.bits
             self._spi.max_speed_hz = self.baudrate
             self._spi.mode = self.mode
             self._spi.bits_per_word = self.bits

-            data = self._spi.xfer([write_value]*(end-start))
-            for i in range(end-start):  # 'readinto' the given buffer
-              buf[start+i] = data[i]
-            self._spi.close()
-        except FileNotFoundError as not_found:
+            data = self._spi.transfer([write_value] * (end - start))
+            for i in range(end - start):  # 'readinto' the given buffer
+                buf[start + i] = data[i]
+            # self._spi.close()
+        except FileNotFoundError:

             print("Could not open SPI device - check if SPI is enabled in kernel!")
             raise
 
             print("Could not open SPI device - check if SPI is enabled in kernel!")
             raise
 

-    def write_readinto(self, buffer_out, buffer_in, out_start=0,
-                       out_end=None, in_start=0, in_end=None):
-        if not buffer_out or not buffer_in:
+    # pylint: disable=too-many-arguments
+    def write_readinto(
+        self, buffer_out, buffer_in, out_start=0, out_end=None, in_start=0, in_end=None
+    ):
+        """Perform a half-duplex write from buffer_out and then
+        read data into buffer_in
+        """
+        if buffer_out is None or buffer_in is None:
+            return
+        if len(buffer_out) < 1 or len(buffer_in) < 1:

             return
         if out_end is None:
             out_end = len(buffer_out)
         if in_end is None:
             in_end = len(buffer_in)
         if out_end - out_start != in_end - in_start:
             return
         if out_end is None:
             out_end = len(buffer_out)
         if in_end is None:
             in_end = len(buffer_in)
         if out_end - out_start != in_end - in_start:

-            raise RuntimeError('Buffer slices must be of equal length.')
+            raise RuntimeError("Buffer slices must be of equal length.")

         try:
         try:

-            self._spi.open(self._port, 0)
-            self.set_no_cs()
+            # self._spi.open(self._port, 0)
+            # self.set_no_cs()

             self._spi.max_speed_hz = self.baudrate
             self._spi.mode = self.mode
             self._spi.bits_per_word = self.bits
             self._spi.max_speed_hz = self.baudrate
             self._spi.mode = self.mode
             self._spi.bits_per_word = self.bits

-            data = self._spi.xfer(list(buffer_out[out_start:out_end+1]))
+            data = self._spi.transfer(list(buffer_out[out_start : out_end + 1]))

             for i in range((in_end - in_start)):
             for i in range((in_end - in_start)):

-                buffer_in[i+in_start] = data[i]
-            self._spi.close()
-        except FileNotFoundError as not_found:
+                buffer_in[i + in_start] = data[i]
+            # self._spi.close()
+        except FileNotFoundError:

             print("Could not open SPI device - check if SPI is enabled in kernel!")
             raise
             print("Could not open SPI device - check if SPI is enabled in kernel!")
             raise

+
+    # pylint: enable=too-many-arguments