Merge pull request #160 from caternuson/ft232h_chunky_spi_write

[hackapet/Adafruit_Blinka.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 a8141b96a0e84a0c90c1f5eab05502f8fede8754..58a465db727588abb1b758c1c5987292e1f30f3c 100755 (executable)
--- a/src/adafruit_blinka/microcontroller/generic_linux/spi.py
+++ b/src/adafruit_blinka/microcontroller/generic_linux/spi.py
@@ -1,5 +1,6 @@
 import spidev
 import time
 import spidev
 import time

+from adafruit_blinka.agnostic import detector

 
 class SPI:
     MSB = 0
 
 class SPI:
     MSB = 0


@@ -29,6 +30,18 @@ class SPI:
         self.baudrate = baudrate
         self.mode = mode
         self.bits = bits
         self.baudrate = baudrate
         self.mode = mode
         self.bits = bits

+        self.chip = detector.chip
+
+    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

 
     def write(self, buf, start=0, end=None):
         if not buf:
 
     def write(self, buf, start=0, end=None):
         if not buf:


@@ -37,14 +50,11 @@ class SPI:
             end = len(buf)
         try:
             self._spi.open(self._port, 0)
             end = len(buf)
         try:
             self._spi.open(self._port, 0)

-            try:
-              self._spi.no_cs = True  # this doesn't work but try anyways
-            except AttributeError:
-              pass
+            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

-            self._spi.writebytes([x for x in buf[start:end]])
+            self._spi.writebytes2(buf[start:end])

             self._spi.close()
         except FileNotFoundError as not_found:
             print("Could not open SPI device - check if SPI is enabled in kernel!")
             self._spi.close()
         except FileNotFoundError as not_found:
             print("Could not open SPI device - check if SPI is enabled in kernel!")


@@ -57,10 +67,7 @@ class SPI:
             end = len(buf)
         try:
             self._spi.open(self._port, 0)
             end = len(buf)
         try:
             self._spi.open(self._port, 0)

-            try:
-              self._spi.no_cs = True  # this doesn't work but try anyways
-            except AttributeError:
-              pass
+            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


@@ -84,10 +91,7 @@ class SPI:
             raise RuntimeError('Buffer slices must be of equal length.')
         try:
             self._spi.open(self._port, 0)
             raise RuntimeError('Buffer slices must be of equal length.')
         try:
             self._spi.open(self._port, 0)

-            try:
-                self._spi.no_cs = True  # this doesn't work but try anyways
-            except AttributeError:
-                pass
+            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