45 lines
1.2 KiB
Lua
45 lines
1.2 KiB
Lua
rs232 = require("luars232")
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-- Linux
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-- port_name = "/dev/ttyS0"
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-- Windows
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port_name = "COM1"
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local out = io.stderr
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-- open port
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local e, p = rs232.open(port_name)
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if e ~= rs232.RS232_ERR_NOERROR then
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-- handle error
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out:write(string.format("can't open serial port '%s', error: '%s'\n",
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port_name, rs232.error_tostring(e)))
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return
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end
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-- set port settings
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assert(p:set_baud_rate(rs232.RS232_BAUD_115200) == rs232.RS232_ERR_NOERROR)
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assert(p:set_data_bits(rs232.RS232_DATA_8) == rs232.RS232_ERR_NOERROR)
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assert(p:set_parity(rs232.RS232_PARITY_NONE) == rs232.RS232_ERR_NOERROR)
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assert(p:set_stop_bits(rs232.RS232_STOP_1) == rs232.RS232_ERR_NOERROR)
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assert(p:set_flow_control(rs232.RS232_FLOW_OFF) == rs232.RS232_ERR_NOERROR)
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out:write(string.format("OK, port open with values '%s'\n", tostring(p)))
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-- read with timeout
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local read_len = 1 -- read one byte
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local timeout = 100 -- in miliseconds
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local err, data_read, size = p:read(read_len, timeout)
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assert(e == rs232.RS232_ERR_NOERROR)
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-- write without timeout
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err, len_written = p:write("test")
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assert(e == rs232.RS232_ERR_NOERROR)
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-- write with timeout 100 msec
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err, len_written = p:write("test\n", timeout)
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assert(e == rs232.RS232_ERR_NOERROR)
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-- close
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assert(p:close() == rs232.RS232_ERR_NOERROR)
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