!191 【轻量级 PR】：add examples/Device/KEY_POLL.PY.

Merge pull request !191 from codercmd/N/A

examples/Device/KEY_POLL.PY

@@ -0,0 +1,33 @@
+from machine import GPIO as STD_GPIO
+
+print('PikaScript LED KEY')
+
+
+LED1 = STD_GPIO()
+LED1.setPin('PE5')
+LED1.setMode('out')
+LED1.enable()
+
+LED2 = STD_GPIO()
+LED2.setPin('PE6')
+LED2.setMode('out')
+LED2.enable()
+
+KEY1 = STD_GPIO()
+KEY1.setPin('PE4')
+# setPull要在setMode前面才行，PikaStdDevice_GPIO.c函数PikaStdDevice_GPIO_setPull不赋值pull
+# PikaStdDevice_GPIO_platformSetMode中才赋值cfg->pull
+KEY1.setPull('up')
+KEY1.setMode('in')
+
+KEY1.enable()
+
+LED1.high()
+LED2.high()
+print(KEY1.read())
+
+while True:
+    if KEY1.read() == 1:
+        LED1.high()
+    else:
+        LED1.low()