Mar 29, 2013 - I read the serial port but I receive an echo too and the read() waits until a. Luasocket modules to connect to the tcp port and read/write data.

I'm new to lua and I'm trying to receive data from the port, ttyACM0, I can write to the port by: wserial = io.open('/dev/ttyACM0','w') wserial:write('hellloooo') wserial:flush() I thought since I can write to it in the same way as I would write to a file that I could read it in the same way as I would read a file. But when I try to read it (using the code below) I just end up in an infinite loop. Rserial=io.open('/dev/ttyACM0','r') while chaine==nil do chaine=rserial:read() rserial:flush() end print(chaine) So my question is what am I doing wrong, how do I read from the port, ttyACM0?

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.

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> > 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. Maxsea timezero 2 keygen crack serial number.