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Revision as of 17:04, 3 August 2010

Examples using Python

The following application note covers the use of Electrum100's peripherals using Python. SYSFS method has been used to access the GPIO's. To create the interfaces for GPIO's under /sys/class/gpio/*, the following configuration has to be enabled in the board configuration file

CONFIG_GPIO_SYSFS=Y

Blinky Example

import sys
import time

print "Blinking User LED"
print "Enter CTRL+C to exit"

def ledon():
        value = open("/sys/class/leds/ds2/brightness","w")
        value.write(str(1))
        value.close()

def ledoff():
        value = open("/sys/class/leds/ds2/brightness","w")
        value.write(str(0))
        value.close()

while True:
        ledon()
        time.sleep(.5)
        ledoff()
        time.sleep(.5)

Button Example

import sys
import time

print "Button Example"
print "Press CTRL + C to exit"

def pins_export():
        try:
                pin1export = open("/sys/class/gpio/export","w")
                pin1export.write(str(63))
                pin1export.close()
        except IOError:
                print "INFO: GPIO 63 already Exists, so skipping export gpio"

def read_button():
        fp1 = open("/sys/class/gpio/gpio63/value","r")
        value = fp1.read()
        return value
        fp1.close()

def write_led(value):
        fp2 =  open("/sys/class/leds/ds2/brightness","w")
        fp2.write(str(value))
        fp2.close()

pins_export()
while True:
        button_value =  read_button()
        write_led(button_value)