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