GPIO LED blinker using SYSFS on the Rock64

[fra87]

Hi
First of all thank you for your work. Very helpful!
I'd like to share a modified version of the function to calculate the pin number, with a bit of validation to be sure that the string is ok (I hope it is ok). The function returns -1 if there was any problem with the string

Code:

def GPIO_name2gpio(value):
    value = value.upper()
    if (value[0:4] != 'GPIO') or (value[5] != '_'):
        return -1
    try:
        bank_num = int(value[4:5], 10)
        pad_nam = GPIO_pads[value[6:7]]
        pad_num = int(value[7:], 10)
        if (bank_num < 0) or (bank_num > 3) or (pad_num < 0) or (pad_num > 7):
            return -1;

        return (bank_num * 32) + (pad_nam * 8) + pad_num
    except (ValueError,KeyError):
        return -1