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from os.path import join
from glob import glob
def find_gpio_base(path="/sys/class/gpio/"):
pattern = "gpiochip*"
for gc in glob(join(path, pattern)):
with open(join(gc, "label")) as f:
label = f.readline().strip()
if label == "1e780000.gpio":
with open(join(gc, "base")) as f:
return int(f.readline().strip())
# trigger a file not found exception
open(join(path, "gpiochip"))
GPIO_BASE = find_gpio_base()
def convertGpio(name):
offset = int(filter(str.isdigit, name))
port = filter(str.isalpha, name.upper())
a = ord(port[-1]) - ord('A')
if len(port) > 1:
a += 26
base = a * 8 + GPIO_BASE
return base + offset
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