Lua Read Write Serial Port

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Here's various code and discussions relating to controlling the RS-232 serial communication port from Lua. Decide more consistently when to raise or return on error-- (io.open/fh:read/fh:write return, but Lua. Local alien = require 'alien'-- win32 values for CreateFile local GENERIC_READ = 0x80000000 local GENERIC_WRITE.

I am new in Lua and I just start developing for OpenWRT in a Dragino platform. I want to develop an application that reads data from Uart and print it in a Luci based web page. But I am having a problem that I described here: When I execute the code: print ( 'Dragino Uart Test started n' ) while 1 do serialin = io. Open ( '/dev/ttyS0', 'r' ) print ( serialin: read ()) --print the data serialin: close () end I read the serial port but I receive an echo too and the read() wait s until a new line character to return. There is any other way to read from a serial port?

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Thank you for your help, I appreciate it. > -----Original Message----- > From: [mailto:] On > Behalf Of Helen Fornazier > Sent: vrijdag 29 maart 2013 12:04 > To: > Subject: Lua and Serial Port > > Hello! > > I am new in Lua and I just start developing for OpenWRT in a Dragino > platform. > > I want to develop an application that reads data from Uart and print it in > a Luci based web page.

> But I am having a problem that I described here: > > back-when-i-read-from-serial-port-why > When I execute the code: > print('Dragino Uart Test started n') > while 1 do > serialin=io.open('/dev/ttyS0','r') > print(serialin:read()) --print the data > serialin:close() > end > I read the serial port but I receive an echo too and the read() waits > until a new line character to return. > > > There is any other way to read from a serial port? Have you tried the serial libraries? See Alternatively, I read somewhere that the upcoming release of LuaSocket also supports serial connections. See > Thank you for your help, I appreciate it. > > -- > Helen Fornazier. > > I am new in Lua and I just start developing for OpenWRT in a Dragino > platform.

> > I want to develop an application that reads data from Uart and print it in > a Luci based web page. > > But I am having a problem that I described here: > > > When I execute the code: > > print('Dragino Uart Test started n')while 1 do > serialin=io.open('/dev/ttyS0','r') > print(serialin:read()) --print the data > serialin:close()end > > I read the serial port but I receive an echo too and the read() waits > until a new line character to return. Apart from the wrong call to read() which is already mentioned in lhf's stackoverflow answer, it seems you need to set some terminal attributes via tcsetattr[1]. Unfortunately neither nixio nor luaposix has support for this function. Typically you could execute the stty program to set those attributes from the commandline, but unfortunately busybox (at least on my openwrt) is compiled without support for stty. There is this module[2] and as Thijs already mentioned a version of luasocket which supports serial connections, but you would need to compile those yourself as well.

[1]: [2]: > > There is any other way to read from a serial port? If you don't want to touch a compiler I suggest the ser2net[3] daemon which can be installed via opkg. It handles mappings between terminal files and tcp sockets and forwards data between them. A quick glance at the source shows that it does 'the right thing' in its terminal configuration, which is to disable echo and line buffering.