WIP

luma/lcd/const.py

@@ -12,6 +12,7 @@ class st7735(object):
     DISPLAYON = 0x29
     DISPLAYOFF = 0x28
 
+
 class ht1621(object):
     DISPLAYON = 0x06
     DISPLAYOFF = 0x04

luma/lcd/device.py

@@ -229,7 +229,6 @@ def command(self, cmd, *args):
             self._serial_interface.data(list(args))
 
 
-import time
 @rpi_gpio
 class ht1621(device):
     def __init__(self, gpio=None, rotate=0, WR=11, DAT=10, CS=8, **kwargs):
@@ -244,10 +243,9 @@ def __init__(self, gpio=None, rotate=0, WR=11, DAT=10, CS=8, **kwargs):
         self.command(0x30)   # Internal RC oscillator @ 256KHz
         self.command(0x52)   # 1/2 Bias and 4 commons
         self.command(0x02)   # System enable
-        self.command(0x06)   # Turn on Bias generator (LCD on)
 
-        #self.clear()
-        #self.show()
+        self.clear()
+        self.show()
 
     def _configure(self, pin):
         if pin is not None:
@@ -278,7 +276,6 @@ def display(self, image):
 
     def command(self, cmd):
         gpio = self._gpio
-        print(self._CS)
         gpio.output(self._CS, gpio.LOW)
         self._write_bits(0x80, 4)   # Command mode
         self._write_bits(cmd, 8)
@@ -294,14 +291,18 @@ def data(self, data):
         gpio.output(self._CS, gpio.HIGH)
 
     def _write_bits(self, value, num_bits):
-        print("_write_bits(0x{0:02x}, {1})".format(value, num_bits))
         gpio = self._gpio
-
         for _ in range(num_bits):
             gpio.output(self._WR, gpio.LOW)
             bit = gpio.HIGH if value & 0x80 > 0 else gpio.LOW
             gpio.output(self._DAT, bit)
             value <<= 1
-            print(bit)
             gpio.output(self._WR, gpio.HIGH)
 
+    def cleanup(self):
+        """
+        Attempt to reset the device & switching it off prior to exiting the
+        python process.
+        """
+        super(ht1621, self).cleanup()
+        self._gpio.cleanup()

test.py

@@ -11,10 +11,36 @@
 
 from luma.lcd.device import ht1621
 from luma.core.render import canvas
+from luma.led_matrix.virtual import sevensegment
+from luma.led_matrix.segment_mapper import _DIGITS, regular
 
-device = ht1621()
+# 0x3e = 0b0011 1110
+# 0x6d = 0b0110 1101
+
+def swap(byte, i, j):
+    x = ((byte >> i) ^ (byte >> j)) & 1
+    return byte ^ ((x << i) | (x << j))
+
+
+def flip(mapper):
+    def wrapped(text, notfound="_"):
+        for byte in mapper(text, notfound):
+            yield swap(swap(byte, 0, 1), 4, 6)
+
+    return wrapped
+
+
+device = sevensegment(ht1621(), mapper=flip(regular))
+
+device.text = "HELLO"
+time.sleep(5)
+
+device.text = "123456"
+time.sleep(5)
+
+#for ch in _DIGITS.keys():
+#    print(ch)
+#    device.text = ch * 6
+#    time.sleep(1)
 
-with canvas(device) as draw:
-    draw.rectangle(device.bounding_box, outline="white")
 
-time.sleep(10)