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Flow control for KISS interfaces, Transport Identity implemented

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Mark Qvist 2018-04-24 17:50:58 +02:00
parent 5c94324230
commit eed78798f2
5 changed files with 206 additions and 74 deletions
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51
RNS/Interfaces/KISSInterface.py
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@ -20,6 +20,7 @@ class KISS():
CMD_TXTAIL = chr(0x04)
CMD_FULLDUPLEX = chr(0x05)
CMD_SETHARDWARE = chr(0x06)
CMD_READY = chr(0x0F)
CMD_RETURN = chr(0xFF)
class KISSInterface(Interface):
@ -33,7 +34,7 @@ class KISSInterface(Interface):
stopbits = None
serial = None
def __init__(self, owner, name, port, speed, databits, parity, stopbits, preamble, txtail, persistence, slottime):
def __init__(self, owner, name, port, speed, databits, parity, stopbits, preamble, txtail, persistence, slottime, flow_control):
self.serial = None
self.owner = owner
self.name = name
@ -45,6 +46,10 @@ class KISSInterface(Interface):
self.timeout = 100
self.online = False
self.packet_queue = []
self.flow_control = flow_control
self.interface_ready = False
self.preamble = preamble if preamble != None else 350;
self.txtail = txtail if txtail != None else 20;
self.persistence = persistence if persistence != None else 64;
@ -88,6 +93,8 @@ class KISSInterface(Interface):
self.setTxTail(self.txtail)
self.setPersistence(self.persistence)
self.setSlotTime(self.slottime)
self.setFlowControl(self.flow_control)
self.interface_ready = True
RNS.log("KISS interface configured")
else:
raise IOError("Could not open serial port")
@ -144,6 +151,15 @@ class KISSInterface(Interface):
if written != len(kiss_command):
raise IOError("Could not configure KISS interface slot time to "+str(slottime_ms)+" (command value "+str(slottime)+")")
def setFlowControl(self, flow_control):
kiss_command = KISS.FEND+KISS.CMD_READY+chr(0x01)+KISS.FEND
written = self.serial.write(kiss_command)
if written != len(kiss_command):
if (flow_control):
raise IOError("Could not enable KISS interface flow control")
else:
raise IOError("Could not enable KISS interface flow control")
def processIncoming(self, data):
self.owner.inbound(data, self)
@ -151,13 +167,30 @@ class KISSInterface(Interface):
def processOutgoing(self,data):
if self.online:
data = data.replace(chr(0xdb), chr(0xdb)+chr(0xdd))
data = data.replace(chr(0xc0), chr(0xdb)+chr(0xdc))
frame = chr(0xc0)+chr(0x00)+data+chr(0xc0)
written = self.serial.write(frame)
if written != len(frame):
raise IOError("Serial interface only wrote "+str(written)+" bytes of "+str(len(data)))
if self.interface_ready:
if self.flow_control:
self.interface_ready = False
data = data.replace(chr(0xdb), chr(0xdb)+chr(0xdd))
data = data.replace(chr(0xc0), chr(0xdb)+chr(0xdc))
frame = chr(0xc0)+chr(0x00)+data+chr(0xc0)
written = self.serial.write(frame)
if written != len(frame):
raise IOError("Serial interface only wrote "+str(written)+" bytes of "+str(len(data)))
else:
self.queue(data)
def queue(self, data):
self.packet_queue.append(data)
def process_queue(self):
if len(self.packet_queue) > 0:
data = self.packet_queue.pop(0)
self.interface_ready = True
self.processOutgoing(data)
elif len(self.packet_queue) == 0:
self.interface_ready = True
def readLoop(self):
try:
@ -196,6 +229,10 @@ class KISSInterface(Interface):
byte = KISS.FESC
escape = False
data_buffer = data_buffer+byte
elif (command == KISS.CMD_READY):
# TODO: add timeout and reset if ready
# command never arrives
self.process_queue()
else:
time_since_last = int(time.time()*1000) - last_read_ms
if len(data_buffer) > 0 and time_since_last > self.timeout: