We have example Python code in voxl-modem to control the B2B GPIO
## All GPIO pins need to be exported before they can be used
#
def gpio_export(num):
subprocess.call("echo " + num + " > /sys/class/gpio/export",
stderr=FNULL, shell=True)
## Each GPIO has to have its direction set prior to use
# @param num pin number
# @param direction 'in' or 'out'
#
def gpio_direction_map(num, direction):
subprocess.call("echo " + direction + " > /sys/class/gpio/gpio" \
+ num + "/direction",
stderr=FNULL, shell=True)
## Set a value to an 'out' gpio
#
def set_gpio(num, value):
subprocess.call("echo " + value + " > /sys/class/gpio/gpio" + num + "/value",
stderr=FNULL, shell=True)
## Reads a GPIO pin
# @apram pin
# pin number
# @return
# integer value [0,1]
def gpio_read_int(pin_int):
gpio_file = '/sys/class/gpio/gpio' + str(pin_int) + '/value'
value = subprocess.check_output(['cat', gpio_file]).strip()
return int(value)
