Files
pallectrum/electrum/plugins/jade/jadepy/jade_serial.py
2022-05-20 16:03:46 +01:00

65 lines
1.7 KiB
Python

import serial
import logging
logger = logging.getLogger('jade.serial')
#
# Low-level Serial backend interface to Jade
# Calls to send and receive bytes over the interface.
# Intended for use via JadeInterface wrapper.
#
# Either:
# a) use via JadeInterface.create_serial() (see JadeInterface)
# (recommended)
# or:
# b) use JadeSerialImpl() directly, and call connect() before
# using, and disconnect() when finished,
# (caveat cranium)
#
class JadeSerialImpl:
def __init__(self, device, baud, timeout):
self.device = device
self.baud = baud
self.timeout = timeout
self.ser = None
def connect(self):
assert self.ser is None
logger.info('Connecting to {} at {}'.format(self.device, self.baud))
self.ser = serial.Serial(self.device, self.baud,
timeout=self.timeout,
write_timeout=self.timeout)
assert self.ser is not None
if not self.ser.is_open:
self.ser.open()
# Ensure RTS and DTR are not set (as this can cause the hw to reboot)
self.ser.setRTS(False)
self.ser.setDTR(False)
logger.info('Connected')
def disconnect(self):
assert self.ser is not None
# Ensure RTS and DTR are not set (as this can cause the hw to reboot)
# and then close the connection
self.ser.setRTS(False)
self.ser.setDTR(False)
self.ser.close()
# Reset state
self.ser = None
def write(self, bytes_):
assert self.ser is not None
return self.ser.write(bytes_)
def read(self, n):
assert self.ser is not None
return self.ser.read(n)