bridge.py 文件源码

def __init__(self, hid):
        self.file = open(hid, 'rb+', buffering=0)
        fcntl.lockf(self.file, fcntl.LOCK_EX)
        flag = fcntl.fcntl(self.file, fcntl.F_GETFL)
        fcntl.fcntl(self.file, fcntl.F_SETFL, flag | os.O_NONBLOCK)

        # Clock 48 MHz
        fcntl.ioctl(self.file, 0xC0054806, bytes([0xA1, 0x01, 0x02]))

        # No flow control mode
        fcntl.ioctl(self.file, 0xC0054806, bytes([0xA1, 0x03, 0x04]))

        self.gpio = [0x00, 0x00]
        self.read_buffer = []
        self._write_gpio()