Merge pull request #11 from chibiegg/feat/spi_gpio

Supports SPI with Raspberry Pi GPIO

Author: chibiegg

README.md

@@ -6,7 +6,7 @@
 
 This library contains two functions.
 One is to connect to Sakura Communication Modules (for Hardware).
-Onother one is to connect to Platform API in https://api.sakura.io/ (for Service).
+Another one is to connect to Platform API in https://api.sakura.io/ (for Service).
 
 
 ## Documentation
@@ -29,12 +29,10 @@ It currently supports I2C (SMBus) ONLY, and tested with Raspberry Pi.
 
 * Python >= 3.4
 * python3-smbus (for I2C)
-
+* python3-rpi.gpio (for GPIO on Raspberry Pi)
 
 ### Install
 
-
-
 ```bash
 # From PyPi
 sudo pip3 install sakuraio
@@ -44,13 +42,25 @@ sudo pip3 install -e git+https://github.com/sakuraio/python-sakuraio.git#egg=sak
 
 ### Example
 
+#### I2C (SMBus)
+
 ```python
 from sakuraio.hardware.rpi import SakuraIOSMBus
 
 sakuraio = SakuraIOSMBus()
 print(sakuraio.get_unique_id())
 ```
 
+#### SPI (GPIO)
+
+```python
+from sakuraio.hardware.rpi import SakuraIOGPIO
+
+sakuraio = SakuraIOGPIO()
+print(sakuraio.get_unique_id())
+```
+
+
 #### output
 
 ```

sakuraio/hardware/rpi/__init__.py

@@ -26,6 +26,55 @@ def recv_byte(self):
         return value
 
 
+class SakuraIOGPIO(SakuraIOBase):
+
+    def __init__(self, miso=9, mosi=10, clk=11, cs=8):
+        from RPi import GPIO
+        self.GPIO = GPIO
+        self.miso = miso
+        self.mosi = mosi
+        self.clk = clk
+        self.cs = cs
+        GPIO.setmode(GPIO.BCM)
+        GPIO.setup(self.miso, GPIO.IN)
+        GPIO.setup(self.mosi, GPIO.OUT)
+        GPIO.setup(self.clk, GPIO.OUT)
+        GPIO.setup(self.cs, GPIO.OUT)
+
+        self.GPIO.output(self.cs, self.GPIO.HIGH)
+        self.GPIO.output(self.clk, self.GPIO.LOW)
+
+    def start(self, write=True):
+        self.GPIO.output(self.cs, self.GPIO.LOW)
+
+    def end(self):
+        self.GPIO.output(self.cs, self.GPIO.HIGH)
+
+    def send_byte(self, value):
+        ret = 0x00
+        for bit in range(8):
+
+            if value & 0x80:
+                self.GPIO.output(self.mosi, self.GPIO.HIGH)
+            else:
+                self.GPIO.output(self.mosi, self.GPIO.LOW)
+
+            self.GPIO.output(self.clk, self.GPIO.HIGH)
+
+            ret <<= 1
+            if self.GPIO.input(self.miso):
+                ret |= 0x01
+
+            self.GPIO.output(self.clk, self.GPIO.LOW)
+
+            value <<= 1
+
+        return ret
+
+    def recv_byte(self):
+        return self.send_byte(0x00)
+
+
 class SakuraIOSPI(SakuraIOBase):
     def __init__(self):
         raise NotImplementedError()