Rs232 = require( 'luars232 ') -- Linux -- port_name = '/dev/ttyS0' -- (Open)BSD -- port_name = '/dev/cua00' -- Windows port_name = 'COM1 ' local out = io. Stderr -- open port local e, p = rs232. Open(port_name) if e ~= rs232. RS232_ERR_NOERROR then -- handle error out: write( string.format( 'can't open serial port '%s', error: '%s' n ', port_name, rs232. Error_tostring(e))) return end -- set port settings assert(p: set_baud_rate(rs232. RS232_BAUD_115200) == rs232.

RS232_ERR_NOERROR) assert(p: set_data_bits(rs232. RS232_DATA_8) == rs232. RS232_ERR_NOERROR) assert(p: set_parity(rs232. RS232_PARITY_NONE) == rs232.

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.

RS232_ERR_NOERROR) assert(p: set_stop_bits(rs232. RS232_STOP_1) == rs232. RS232_ERR_NOERROR) assert(p: set_flow_control(rs232. RS232_FLOW_OFF) == rs232.

RS232_ERR_NOERROR) out: write( string.format( 'OK, port open with values '%s' n ', tostring(p))) -- read with timeout local read_len = 1 -- read one byte local timeout = 100 -- in miliseconds local err, data_read, size = p: read(read_len, timeout) assert(e == rs232. RS232_ERR_NOERROR) -- write without timeout err, len_written = p: write( 'test ') assert(e == rs232. RS232_ERR_NOERROR) -- write with timeout 100 msec err, len_written = p: write( 'test n ', timeout) assert(e == rs232. RS232_ERR_NOERROR) -- close assert(p: close() == rs232. RS232_ERR_NOERROR) • Copy lines • Copy permalink • Go.