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Allow hardware and software handshake at same time #61

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38 changes: 23 additions & 15 deletions src/serial.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -727,13 +727,20 @@ pub const StopBits = enum(u2) {
two = 2,
};

pub const Handshake = enum {
/// No handshake is used
none,
pub const Handshake = packed struct(u2) {
/// XON-XOFF software handshake is used.
software,
use_software: bool = false,
/// Hardware handshake with RTS/CTS is used.
hardware,
use_hardware: bool = false,

pub const none = @This(){};
pub const software = @This(){ .use_software = true };
pub const hardware = @This(){ .use_hardware = true };
pub const both = @This(){ .use_software = true, .use_hardware = true };

pub fn isNone(this: @This()) bool {
return !(this.use_software or this.use_hardware);
}
};

pub const WordSize = enum(u4) {
Expand Down Expand Up @@ -773,6 +780,7 @@ pub const SerialConfig = struct {
.none => "",
.hardware => " RTS/CTS",
.software => " XON/XOFF",
.both => " RTS/CTS+XON/XOFF",
},
});
}
Expand Down Expand Up @@ -806,10 +814,10 @@ pub fn configureSerialPort(port: std.Io.File, config: SerialConfig) !void {

dcb.flags = @bitCast(DCBFlags{
.fParity = config.parity != .none,
.fOutxCtsFlow = config.handshake == .hardware,
.fOutX = config.handshake == .software,
.fInX = config.handshake == .software,
.fRtsControl = @as(u2, if (config.handshake == .hardware) 1 else 0),
.fOutxCtsFlow = config.handshake.hardware,
.fOutX = config.handshake.use_software,
.fInX = config.handshake.use_software,
.fRtsControl = @as(u2, if (config.handshake.hardware) 1 else 0),
});

dcb.wReserved = 0;
Expand Down Expand Up @@ -854,7 +862,7 @@ pub fn configureSerialPort(port: std.Io.File, config: SerialConfig) !void {
settings.cflag = @bitCast(@intFromEnum(baudmask));
settings.cflag.PARODD = config.parity == .odd or config.parity == .mark;
settings.cflag.PARENB = config.parity != .none;
settings.cflag.CLOCAL = config.handshake == .none;
settings.cflag.CLOCAL = config.handshake.isNone();
settings.cflag.CSTOPB = config.stop_bits == .two;
settings.cflag.CREAD = true;
settings.cflag.CSIZE = switch (config.word_size) {
Expand All @@ -866,8 +874,8 @@ pub fn configureSerialPort(port: std.Io.File, config: SerialConfig) !void {

settings.iflag = .{};
settings.iflag.INPCK = config.parity != .none;
settings.iflag.IXON = config.handshake == .software;
settings.iflag.IXOFF = config.handshake == .software;
settings.iflag.IXON = config.handshake.use_software;
settings.iflag.IXOFF = config.handshake.use_hardware;
// these are common between linux and macos
// settings.iflag.IGNBRK = false;
// settings.iflag.BRKINT = false;
Expand All @@ -887,7 +895,7 @@ pub fn configureSerialPort(port: std.Io.File, config: SerialConfig) !void {
settings.cflag.CMSPAR = config.parity == .mark;
}
if (@hasField(std.c.tc_cflag_t, "CRTSCTS")) {
settings.cflag.CRTSCTS = config.handshake == .hardware;
settings.cflag.CRTSCTS = config.handshake.use_hardware;
}
// settings.cflag.ADDRB = false;
// settings.iflag.IUCLC = false;
Expand All @@ -896,8 +904,8 @@ pub fn configureSerialPort(port: std.Io.File, config: SerialConfig) !void {
// just setting baud on mac with cfsetspeed
}
if (builtin.os.tag == .macos) {
settings.cflag.CCTS_OFLOW = config.handshake == .hardware;
settings.cflag.CRTS_IFLOW = config.handshake == .hardware;
settings.cflag.CCTS_OFLOW = config.handshake.use_hardware;
settings.cflag.CRTS_IFLOW = config.handshake.use_hardware;
// settings.cflag.CIGNORE = false;
// settings.cflag.CDTR_IFLOW = false;
// settings.cflag.CDSR_OFLOW = false;
Expand Down
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