Add writeto_then_readfrom for non-stop transactions on linux

[hackapet/Adafruit_Blinka.git] / src / busio.py

diff --git a/src/busio.py b/src/busio.py
index 3523acd7289e172357725233f5a55439558f35a4..ad96061017680014bff213ba61700747af0bfae1 100755 (executable)
--- a/src/busio.py
+++ b/src/busio.py
@@ -53,6 +53,8 @@ class I2C(Lockable):
         return self._i2c.readfrom_into(address, buffer, stop)
 
     def writeto(self, address, buffer, start=0, end=None, stop=True):
+        if isinstance(buffer, str):
+            buffer = bytes([ord(x) for x in buffer])
         if start is not 0 or end is not None:
             if end is None:
                 return self._i2c.writeto(address, memoryview(buffer)[start:], stop)
@@ -60,6 +62,8 @@ class I2C(Lockable):
                 return self._i2c.writeto(address, memoryview(buffer)[start:end], stop)
         return self._i2c.writeto(address, buffer, stop)
 
+    def writeto_then_readfrom(self, address, buffer_out, buffer_in, out_start=0, out_end=None, in_start=0, in_end=None, stop=False):
+        return self._i2c.write_readinto(address, buffer_out, buffer_in, out_start, out_end, in_start, in_end, stop)
 
 class SPI(Lockable):
     def __init__(self, clock, MOSI=None, MISO=None):
@@ -70,7 +74,9 @@ class SPI(Lockable):
             from machine import SPI as _SPI
         from microcontroller.pin import spiPorts
         for portId, portSck, portMosi, portMiso in spiPorts:
-            if clock == portSck and MOSI == portMosi and MISO == portMiso:
+            if ((clock == portSck) and                   # Clock is required!
+                (MOSI == portMosi or MOSI == None) and   # But can do with just output
+                (MISO == portMiso or MISO == None)):      # Or just input
                 self._spi = _SPI(portId)
                 self._pins = (portSck, portMosi, portMiso)
                 break
@@ -106,11 +112,11 @@ class SPI(Lockable):
         self._spi = None
         self._pinIds = None
 
-    def write(self, buf):
-        return self._spi.write(buf)
+    def write(self, buf, start=0, end=None):
+        return self._spi.write(buf, start, end)
 
-    def readinto(self, buf):
-        return self._spi.readinto(buf)
+    def readinto(self, buf, start=0, end=None, write_value=0):
+        return self._spi.readinto(buf, start, end)
 
     def write_readinto(self, buffer_out, buffer_in,  out_start=0, out_end=None, in_start=0, in_end=None):
         return self._spi.write_readinto(buffer_out, buffer_in, out_start, out_end, in_start, in_end)