-"""
-From introspection of microcontroller.pin on Feather Huzzah running CircuitPython
->>> dir(microcontroller.pin)
-['TOUT', 'XPD_DCDC', 'MTMS', 'MTDI', 'MTCK', 'MTDO', 'GPIO2', 'GPIO0', 'GPIO4', 'SD_DATA_2', 'SD_DATA_3', 'SD_CMD', 'SD_CLK', 'SD_DATA_0', 'SD_DATA_1', 'DVDD', 'U0RXD', 'U0TXD']
->>> dir(board)
-['ADC', 'GPIO16', 'GPIO14', 'SCK', 'GPIO12', 'MISO', 'GPIO13', 'MOSI', 'GPIO15', 'GPIO2', 'GPIO0', 'GPIO4', 'SDA', 'RX', 'TX', 'GPIO5', 'SCL']
-"""
-"""
-class cpu():
- def frequency(self):
- from machine import freq
- return freq()
-"""