use global variable pixel_ring as a singleton

Author: Yihui Xiong

respeaker/pixel_ring.py

@@ -1,71 +1,24 @@
-from usb_hid import INTERFACE, usb_backend
-from spi import SPI
-
-CRC8_TABLE = (
-    0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
-    0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
-    0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
-    0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
-    0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
-    0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
-    0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
-    0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
-    0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
-    0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
-    0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
-    0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
-    0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
-    0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
-    0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
-    0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
-    0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
-    0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
-    0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
-    0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
-    0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
-    0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
-    0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
-    0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
-    0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
-    0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
-    0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
-    0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
-    0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
-    0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
-    0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
-    0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
-)
-
-
-def crc8(data):
-    result = 0
-    for b in data:
-        result = CRC8_TABLE[result ^ b]
-    return result
+import usb_hid
+from spi import spi
 
 
 class PixelRing:
-    def __init__(self):
-        self.hid = self.get_hid()
-        if not self.hid:
-            self.spi = SPI()
+    mono_mode = 1
+    listening_mode = 2
+    waiting_mode = 3
+    speaking_mode = 4
 
-    @staticmethod
-    def get_hid():
-        interface = INTERFACE[usb_backend]
-        if interface.isAvailable:
-            boards = interface.getAllConnectedInterface()
-            if boards:
-                return boards[0]
+    def __init__(self):
+        self.hid = usb_hid.get()
 
     def off(self):
         self.set_color(rgb=0)
 
-    def set_color(self, r=0, g=0, b=0, rgb=None):
+    def set_color(self, rgb=None, r=0, g=0, b=0):
         if rgb:
-            self.write(0, [1, rgb & 0xFF, (rgb >> 8) & 0xFF, (rgb >> 16) & 0xFF])
+            self.write(0, [self.mono_mode, rgb & 0xFF, (rgb >> 8) & 0xFF, (rgb >> 16) & 0xFF])
         else:
-            self.write(0, [1, b, g, r])
+            self.write(0, [self.mono_mode, b, g, r])
 
     def listen(self, direction=None):
         if direction is None:
@@ -74,10 +27,10 @@ def listen(self, direction=None):
             self.write(0, [2, 0, direction & 0xFF, (direction >> 8) & 0xFF])
 
     def wait(self):
-        self.write(0, [3, 0, 0, 0])
+        self.write(0, [self.waiting_mode, 0, 0, 0])
 
     def speak(self, strength, direction):
-        self.write(0, [4, strength, direction & 0xFF, (direction >> 8) & 0xFF])
+        self.write(0, [self.speaking_mode, strength, direction & 0xFF, (direction >> 8) & 0xFF])
 
     def set_volume(self, volume):
         self.write(0, [5, 0, 0, volume])
@@ -103,37 +56,37 @@ def write(self, address, data):
         if self.hid:
             packet = bytearray([address & 0xFF, (address >> 8) & 0xFF, length & 0xFF, (length >> 8) & 0xFF]) + data
             self.hid.write(packet)
-        else:
-            crc = crc8(data)
-            packet = bytearray([0xA5, address & 0xFF, length & 0xFF]) + data + bytearray([crc])
-            self.spi.write(packet)
+            print packet
+        spi.write(address=address, data=data)
 
     def close(self):
         if self.hid:
             self.hid.close()
 
 
+pixel_ring = PixelRing()
+
+
 if __name__ == '__main__':
     import time
 
-    ring = PixelRing()
-    ring.listen(0)
+    pixel_ring.listen()
     time.sleep(3)
-    ring.wait()
+    pixel_ring.wait()
     time.sleep(3)
     for level in range(2, 8):
-        ring.speak(level, 0)
+        pixel_ring.speak(level, 0)
         time.sleep(1)
-    ring.set_volume(4)
+    pixel_ring.set_volume(4)
     time.sleep(3)
 
     color = 0x800000
     while True:
         try:
-            ring.set_color(rgb=color)
+            pixel_ring.set_color(rgb=color)
             color += 0x10
             time.sleep(1)
         except KeyboardInterrupt:
             break
 
-    ring.off()
+    pixel_ring.off()