added i2c-button-blink

sf105 · sf105 · commit 3fb98716ce80 · 2013-04-08T15:49:02.000+01:00
diff --git a/examples/button-blink b/examples/button-blink
@@ -11,5 +11,5 @@ with button, led:
     print("ready")
     
     for v in cycle([1,0]):
-        led.value = v * button.value
+        led.value = v and button.value
         sleep(0.5)
diff --git a/examples/i2c-blink b/examples/i2c-blink
@@ -7,8 +7,8 @@ import quick2wire.i2c as i2c
 from quick2wire.parts.mcp23017 import MCP23017
 from quick2wire.parts.mcp23x17 import Out
 
-# usage: i2c-blank [pin_number]
-# pin_number defaults to 1
+# usage: i2c-blink [led_pin]
+# led_pin defaults to 1
 def the_pin_number():
     if len(sys.argv) < 2:
         return 1
diff --git a/examples/i2c-button-blink b/examples/i2c-button-blink
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+import sys
+from contextlib import closing
+from itertools import cycle
+from time import sleep
+import quick2wire.i2c as i2c
+from quick2wire.parts.mcp23017 import MCP23017
+from quick2wire.parts.mcp23x17 import In, Out
+
+# usage: i2c-button-blink [led_pin button_pin]
+# led_number defaults to 0
+# button_pin defaults to 3
+def the_pin_numbers():
+    if len(sys.argv) < 3:
+        return (0, 3)
+    return (int(sys.argv[1]), int(sys.argv[3]))
+
+i2c_address = 0x20
+pin_bank = 1
+led_pin, button_pin = the_pin_numbers()
+
+with closing(i2c.I2CMaster()) as bus:
+    chip = MCP23017(bus, 0x20)
+    chip.reset()
+    led = chip[pin_bank][led_pin]
+    led.direction = Out
+    button = chip[pin_bank][button_pin]
+    button.direction = In
+
+    try:
+        while True:
+            led.value = (not led.value) and button_pin.value
+            sleep(0.5)
+    finally:
+        chip.reset()
+
