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Implemented ioctl call to set custom baud rate on OSX #48

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Implemented ioctl call to set custom baud rate on OSX #48

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2 changes: 2 additions & 0 deletions lib/rubyserial/osx_constants.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@ module Posix
CCTS_OFLOW = 0x00010000 # Clearing this disables RTS AND CTS.
TCSANOW = 0
NCCS = 20
IOSSIOSPEED = 0x80045402 # ioctl request for OSX custom baud rate

DATA_BITS = {
5 => 0x00000000,
Expand Down Expand Up @@ -188,6 +189,7 @@ class Termios < FFI::Struct

attach_function :tcsetattr, [ :int, :int, RubySerial::Posix::Termios ], :int, blocking: true
attach_function :fcntl, [:int, :int, :varargs], :int, blocking: true
attach_function :ioctl, [:int, :ulong, :pointer], :int, blocking: true
attach_function :open, [:pointer, :int], :int, blocking: true
attach_function :close, [:int], :int, blocking: true
attach_function :write, [:int, :pointer, :int],:int, blocking: true
Expand Down
43 changes: 35 additions & 8 deletions lib/rubyserial/posix.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -21,12 +21,7 @@ def initialize(address, baude_rate=9600, data_bits=8, parity=:none, stop_bits=1)
raise RubySerial::Error, RubySerial::Posix::ERROR_CODES[FFI.errno]
end

@config = build_config(baude_rate, data_bits, parity, stop_bits)

err = RubySerial::Posix.tcsetattr(@fd, RubySerial::Posix::TCSANOW, @config)
if err == -1
raise RubySerial::Error, RubySerial::Posix::ERROR_CODES[FFI.errno]
end
set_termios_attrs(baude_rate, data_bits, parity, stop_bits)
end

def closed?
Expand Down Expand Up @@ -108,12 +103,29 @@ def get_until_sep(sep, limit)
bytes.map { |e| e.chr }.join
end

def set_termios_attrs(baude_rate, data_bits, parity, stop_bits)
@config = build_config(baude_rate, data_bits, parity, stop_bits)

err = RubySerial::Posix.tcsetattr(@fd, RubySerial::Posix::TCSANOW, @config)
if err == -1
raise RubySerial::Error, RubySerial::Posix::ERROR_CODES[FFI.errno]
end

set_custom_baud_rate(baude_rate) if osx_custom_speed?(baude_rate)
end

def build_config(baude_rate, data_bits, parity, stop_bits)
config = RubySerial::Posix::Termios.new

# Use a standard speed of 9600 for tcsetattr config if we are on OSX
# and trying to set non-standard speed value. We can later set it using ioctl
tc_baude_rate = RubySerial::Posix::BAUDE_RATES[
osx_custom_speed?(baude_rate) ? 9600 : baude_rate
]

config[:c_iflag] = RubySerial::Posix::IGNPAR
config[:c_ispeed] = RubySerial::Posix::BAUDE_RATES[baude_rate]
config[:c_ospeed] = RubySerial::Posix::BAUDE_RATES[baude_rate]
config[:c_ispeed] = tc_baude_rate
config[:c_ospeed] = tc_baude_rate
config[:c_cflag] = RubySerial::Posix::DATA_BITS[data_bits] |
RubySerial::Posix::CREAD |
RubySerial::Posix::CLOCAL |
Expand All @@ -129,4 +141,19 @@ def build_config(baude_rate, data_bits, parity, stop_bits)

config
end

def osx_custom_speed?(baude_rate)
!RubySerial::ON_LINUX && !RubySerial::Posix::BAUDE_RATES[baude_rate]
end

def set_custom_baud_rate(baude_rate)
rate_pointer = FFI::MemoryPointer.new(:uint, 1)
rate_pointer.put(:uint, 0, baude_rate)

err = RubySerial::Posix.ioctl(@fd, RubySerial::Posix::IOSSIOSPEED, rate_pointer)

if err == -1
raise RubySerial::Error, RubySerial::Posix::ERROR_CODES[FFI.errno]
end
end
end