class FtdiChip:
device = None
def __init__(self, serial_str):
self.serial = serial_str
self.get_device()
self.flush_input()
@staticmethod
def find_all():
devices = Ftdi.find_all([(FTDI_VENDOR_ID, FTDI_PRODUCT_ID)])
return [(serial_str, description) for
vendor_id, product_id, serial_str, num_interfaces,
description in devices]
def get_device(self):
url = "ftdi://ftdi:%s:%s/2" % (PRODUCT_DESCRIPTION, self.serial)
if self.device is not None:
self.device.close()
self.device = SerialFtdi(url, timeout=.001)
def write(self, data):
return self.device.write(data)
def read(self, length):
"""Read data from device
Read data from device, and catch one level of spurious empty
errors.
"""
try:
data = self.device.read(length)
except ftdi.FtdiError as exc:
logger.warning("Spurious PyFTDI 'None' error, recovering...")
if '[Errno None]' in exc.message:
self.get_device()
data = self.device.read(length)
return data
else:
raise
else:
return data
raise Exception("Programming error. I should not be here.")
def flush_input(self):
while self.read(64 * 1024):
logger.info("Flushed input buffer")
def close(self):
self.device.close()
class FtdiChip:
device = None
def __init__(self, serial_str):
self.serial = serial_str
self.get_device()
self.flush_input()
@staticmethod
def find_all():
devices = Ftdi.find_all([(FTDI_VENDOR_ID, FTDI_PRODUCT_ID)])
return [(serial_str, description) for vendor_id, product_id,
serial_str, num_interfaces, description in devices]
def get_device(self):
url = "ftdi://ftdi:%s:%s/2" % (PRODUCT_DESCRIPTION, self.serial)
if self.device is not None:
self.device.close()
self.device = SerialFtdi(url, timeout=.001)
def write(self, data):
return self.device.write(data)
def read(self, length):
"""Read data from device
Read data from device, and catch one level of spurious empty
errors.
"""
try:
data = self.device.read(length)
except ftdi.FtdiError as exc:
logger.warning("Spurious PyFTDI 'None' error, recovering...")
if '[Errno None]' in exc.message:
self.get_device()
data = self.device.read(length)
return data
else:
raise
else:
return data
raise Exception("Programming error. I should not be here.")
def flush_input(self):
while self.read(64 * 1024):
logger.info("Flushed input buffer")
def close(self):
self.device.close()
def get_device(self):
url = "ftdi://ftdi:%s:%s/2" % (PRODUCT_DESCRIPTION, self.serial)
if self.device is not None:
self.device.close()
self.device = SerialFtdi(url, timeout=.001)
def get_device(self):
url = "ftdi://ftdi:%s:%s/2" % (PRODUCT_DESCRIPTION, self.serial)
if self.device is not None:
self.device.close()
self.device = SerialFtdi(url, timeout=.001)
