X-Git-Url: https://git.ayoreis.com/hackapet/Adafruit_Blinka.git/blobdiff_plain/a9dce262feed0b44f2b441e6e0236dfbc4a189c2..9f302982b22b1ee160bad6d0408a01f4b220b934:/src/adafruit_blinka/microcontroller/raspi_23/spi.py

diff --git a/src/adafruit_blinka/microcontroller/raspi_23/spi.py b/src/adafruit_blinka/microcontroller/raspi_23/spi.py
old mode 100644
new mode 100755
index 7e3eec5..1b6bdc0
--- a/src/adafruit_blinka/microcontroller/raspi_23/spi.py
+++ b/src/adafruit_blinka/microcontroller/raspi_23/spi.py
@@ -64,6 +64,31 @@ class SPI:
             for i in range(len(buf)):  # 'readinto' the given buffer
               buf[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 or in_end is None:
+            out_end = len(buffer_out)
+            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.open(self._port, 0)
+            try:
+                self._spi.no_cs = True  # this doesn't work but try anyways
+            except AttributeError:
+                pass
+            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]))
+            for i in range(len(buffer_in[in_start:in_end])): # 'readinto' the given buffer
+                buffer_in[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
\ No newline at end of file