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一个linux下rs485驱动程序的源代码

There are located simple applications, which can be used
as start for larger projects.

  ul_spy	- uLan message monitor
  ul_sendhex	- intelhex downloader and uploader
  ul_lcabsp	- pasive receive and show absorbancy 
 		  send by LCD5000

Basic parameters are common to all these programs 

  -d, --uldev  <name>      name of uLan device [/dev/ulan]
  -m, --module <num>       messages from/to module
  -p, --print  <max>       print modules to max address
      --debug-kernel <m>   flags to debug kernel
  -V, --version            show version
  -h, --help               this usage screen

Other parameters are program specific.

    ul_spy
    ======

Additional parameters of ul_spy enable to select filter
for specific messages. If module is specified, only messages
send to/from this module are printed. Next options can be used
to more restrict printed messages.

  -s, --source <num>       source of messages
  -t, --target <num>       destination of messages
  -c, --command <num>      commands of printed messages

Data of message body are not normaly printed.

  -a, --all-data           show all messages data

ul_spy prints messages frames in next format optionally followed
by frame body data. Pritnt of following frames of multi-frame 
messages start with state written in lower case characters.

  <state> (s:<saddr>,d:<daddr>,c:<cmd>,f:<flg>,l:<len>)

The state can be REC, PROC or FAIL.

    ul_sendhex
    ==========

This program enables to download Intel HEX files into
target module.

usage: ul_sendhex <parameters> <hex_file>

  -t, --type   <num>       target module memory space
  -s, --start  <addr>      start address of transfer
  -l, --length <num>       length of upload block
  -g, --go     <addr>      start program from address
  -r, --reset              reset before download
  -u, --upload             upload memory block [download]