Serge NOEL
40 lines
730 B
Python
40 lines
730 B
Python
# Send a DCC packet
|
|
#
|
|
# Author: Bob Jacobsen, copyright 2009
|
|
# Part of the JMRI distribution
|
|
|
|
import jmri
|
|
|
|
# Send a packet; the argument includes _all_ the bytes
|
|
def send(pkt):
|
|
dcc.sendPacket(pkt, 1)
|
|
|
|
# Send a packet; an XOR'd checksum is appended
|
|
def sendXOR(pkt):
|
|
xor = 0
|
|
for x in pkt:
|
|
xor = xor^x
|
|
newpkt = pkt+[xor]
|
|
send(newpkt)
|
|
|
|
# define and send the accessory packet to
|
|
# program CV 514 to 0
|
|
# on accessory decoder 2041
|
|
|
|
Adr = 2041
|
|
Cv = 514
|
|
Val = 0
|
|
|
|
# Define the packet bytes.
|
|
# The following uses "basic addressing" and "all outputs on decoder"
|
|
b1 = 128+Adr/8
|
|
b2 = 128+((Adr&0x7)*16)+8
|
|
b3 = 0xEC+(Cv/256)
|
|
b4 = Cv&0xFF
|
|
b5 = Val
|
|
|
|
# send it with an error correction byte
|
|
sendXOR([b1 b2 b3 b4 b5])
|
|
|
|
|