example
.......\adc
.......\...\adc.c
.......\gpio
.......\....\input.c
.......\....\output.c
.......\i2c
.......\...\i2c
.......\...\i2c-0
.......\...\write.c
.......\Serial
.......\......\comtest.c
.......\spi
.......\...\readme.txt
.......\...\spidev_test
.......\...\spidev_test.c