initial working ft232h i2c/spi/gpio

[Adafruit_Blinka-hackapet.git] / src / adafruit_blinka / microcontroller / ft232h / spi.py

diff --git a/src/adafruit_blinka/microcontroller/ft232h/spi.py b/src/adafruit_blinka/microcontroller/ft232h/spi.py
new file mode 100644 (file)
index 0000000..26e1bbb
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/ft232h/spi.py
@@ -0,0 +1,50 @@
+from adafruit_blinka.microcontroller.ft232h.pin import Pin
+
+class SPI:
+    MSB = 0
+
+    baudrate = 100000
+    mode = 0
+    bits = 8
+
+    def __init__(self):
+        from pyftdi.spi import SpiController
+        self._spi = SpiController(cs_count=1)
+        self._spi.configure('ftdi:///1')
+        Pin.ft232h_gpio = self._spi.get_gpio()
+
+    def init(self, baudrate=100000, polarity=0, phase=0, bits=8,
+                  firstbit=MSB, sck=None, mosi=None, miso=None):
+        self.cs = 0
+        self.freq = baudrate
+        if polarity == 0 and phase == 0:
+            self.mode = 0
+        elif polarity == 0 and phase == 1:
+            self.mode = 1
+        elif polarity == 1 and phase == 0:
+            raise ValueError("SPI mode 2 is not supported.")
+        elif polarity == 1 and phase == 1:
+            self.mode = 3
+        else:
+            raise ValueError("Unknown SPI mode.")
+
+    def write(self, buf, start=0, end=None):
+        end = end if end else len(buf)
+        port = self._spi.get_port(self.cs, self.freq, self.mode)
+        port.write(buf[start:end])
+
+    def readinto(self, buf, start=0, end=None, write_value=0):
+        end = end if end else len(buf)
+        port = self._spi.get_port(self.cs, self.freq, self.mode)
+        result = port.read(end-start)
+        for i, b in enumerate(result):
+            buf[start+i] = b
+
+    def write_readinto(self, buffer_out, buffer_in,  out_start=0, out_end=None, in_start=0, in_end=None):
+        out_end = out_end if out_end else len(buffer_out)
+        in_end = in_end if in_end else len(buffer_in)
+        port = self._spi.get_port(self.cs, self.freq, self.mode)
+        result = port.exchange(buffer_out[out_start:out_end],
+                               in_end-in_start)
+        for i, b in enumerate(result):
+            buffer_in[in_start+i] = b
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