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#! /usr/bin/env lua
local M = require 'posix.termio'
local F = require 'posix.fcntl'
local U = require 'posix.unistd'
local dev = arg[1] or '/dev/ttyUSB0'
-- Open serial port and do settings
local fds, err = F.open(dev, F.O_RDWR + F.O_NONBLOCK)
if not fds then
print('Could not open serial port ' .. dev .. ':', err)
os.exit(1)
end
M.tcsetattr(fds, 0, {
cflag = M.B115200 + M.CS8 + M.CLOCAL + M.CREAD,
iflag = M.IGNPAR,
oflag = M.OPOST,
cc = {
[M.VTIME] = 0,
[M.VMIN] = 1,
}
})
-- Set stdin to non canonical mode. Save current settings
local save = M.tcgetattr(0)
M.tcsetattr(0, 0, {
cc = {
[M.VTIME] = 0,
[M.VMIN] = 1
}
})
-- Loop, reading and writing between ports. ^C stops
local set = {
[0] = {events={IN=true}},
[fds] = {events={IN =true}},
}
U.write(1, 'Starting terminal, hit ^C to exit\r\n')
local function exit(msg)
M.tcsetattr(0, 0, save)
print '\n'
print(msg)
os.exit(0)
end
while true do
local r = require 'posix.poll'.poll(set, -1)
for fd, d in pairs(set) do
if d.revents and d.revents.IN then
if fd == 0 then
local d, err = U.read(0, 1024)
if not d then
exit(err)
end
if d == string.char(3) then
exit('Bye')
end
local ok, err = U.write(fds, d)
if not ok then
exit(err)
end
end
if fd == fds then
local d, err = U.read(fds, 1024)
if not d then
exit(err)
end
local ok, err = U.write(1, d)
if not ok then
exit(err)
end
end
end
end
end
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