Lua Read Write Serial Port

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? 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].

How to read from a serial port in lua. Right when I do cat /dev/ttyACM0 I don\'t get anything but I tried to read and write to the file by python and I could.

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.

You could then use the default nixio[4] (which comes bundled with luci) or luasocket modules to connect to the tcp port and read/write data. [3]: [4]: > > Thank you for your help, I appreciate it. > HTH, Philipp.

> 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.

Find showtimes, watch trailers, browse photos, track your Watchlist and rate your favorite movies and TV shows on your phone or tablet! IMDb Mobile site. Watch latest \'Dance India Dance Season 4\' episodes on http://www.zeetv.com. Season 1 fortnite. DANCE PLUS 4| Season 1 video 2018. How to download dance plus 4 full episode|Dance +4|Dance +4 full episode|Nasrullah. Varun Dhawan & Jacqueline Fernandez. Dance India Dance (also called by the acronym DID; tagline:Dance Ka Asli ID D.I.D.) is an Indian dance competition reality television series that airs on Zee TV, created & produced by Essel Vision Productions. It premiered on 30 January 2009.

...'>Lua Read Write Serial Port(18.04.2019)