examples: add an example PCF8574 script

GlasgowEmbedded · Oct 9, 2020 · 61480b0 · 61480b0
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diff --git a/examples/i2c-pcf8574.py b/examples/i2c-pcf8574.py
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+"""
+An example of a script that can be used with the run-script mode.
+
+This will read and write the pins of a PCF8574. Once connected, run:
+
+    glasgow run-script i2c-pcf8574.py i2c-initiator -V 3.3
+"""
+
+# read pin values
+p = await iface.read(0x20, 1)
+print('I/O pin state: 0b{:08b}'.format(p))
+
+# write pin values
+await iface.write(0x20, [ 0x55 ])
+
+# power down the device after use
+await device.set_voltage("AB", 0)