fix merge conflict in branch

[hackapet/Adafruit_Blinka.git] / src / adafruit_blinka / microcontroller / mips24kec / spi2.py

diff --git a/src/adafruit_blinka/microcontroller/mips24kec/spi2.py b/src/adafruit_blinka/microcontroller/mips24kec/spi2.py
new file mode 100755 (executable)
index 0000000..1ad3c9b
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/mips24kec/spi2.py
@@ -0,0 +1,93 @@
+from periphery import SPI
+import time
+from adafruit_blinka.agnostic import detector
+
+class SPI:
+    MSB = 0
+    LSB = 1
+    CPHA = 1
+    CPOL = 2
+
+    baudrate = 100000
+    mode = 0
+    bits = 8
+
+    def __init__(self, portid):
+        if isinstance(portid, tuple):
+            self._bus_id = portid[0]
+            self._device_id = portid[1]
+        else:
+            self._bus_id = portid
+            self._device_id = 0
+
+    def init(self, baudrate=100000, polarity=0, phase=0, bits=8,
+                  firstbit=MSB, sck=None, mosi=None, miso=None):
+        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
+
+    def set_no_cs(self):
+        # No kernel seems to support this, so we're just going to pass
+        pass
+
+    @property
+    def frequency(self):
+        return self.baudrate
+
+    def write(self, buf, start=0, end=None):
+        if not buf:
+            return
+        if end is None:
+            end = len(buf)
+        try:
+            self._spi = SPI("/dev/spidev{}.{}".format(self._bus_id, self._device_id), self.mode, self.baudrate, bits_per_word=self.bits)
+            data_in = spi.transfer(buf[start:end])
+            self._spi.close()
+        except FileNotFoundError as not_found:
+            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:
+            return
+        if end is None:
+            end = len(buf)
+        try:
+            self._spi = SPI("/dev/spidev{}.{}".format(self._bus_id, self._device_id), self.mode, self.baudrate, bits_per_word=self.bits)
+            data = 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 as not_found:
+            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:
+            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.')
+        try:
+            self._spi = SPI("/dev/spidev{}.{}".format(self._bus_id, self._device_id), self.mode, self.baudrate, bits_per_word=self.bits)
+            data = spi.transfer(list(buffer_out[out_start:out_end+1]))
+            for i in range((in_end - in_start)):
+                buffer_in[i+in_start] = data[i]
+            self._spi.close()
+        except FileNotFoundError as not_found:
+            print("Could not open SPI device - check if SPI is enabled in kernel!")
+            raise