New hardware synth support added. Untested, so consider this experimental.

docs/fenrir.1

@@ -238,6 +238,14 @@ speechdDriver - Speech-dispatcher (recommended)
 .IP \[bu] 4  
 genericDriver - Command-line TTS (espeak, etc.)
 .IP \[bu] 4
+dectalkDriver - DECtalk-compatible serial hardware speech
+.IP \[bu] 4
+litetalkDriver - LiteTalk-compatible serial hardware speech
+.IP \[bu] 4
+doubletalkDriver - DoubleTalk LT-compatible serial hardware speech
+.IP \[bu] 4
+tripletalkDriver - TripleTalk-compatible serial hardware speech
+.IP \[bu] 4
 debugDriver - Debug/testing
 
 .TP

docs/fenrir.adoc

@@ -1548,8 +1548,12 @@ enabled=True
 Values: on=`+True+`, off=`+False+`
 
 # Select speech driver, options are speechdDriver (default),
-genericDriver or espeakDriver: driver=speechdDriver #driver=espeakDriver
+genericDriver, dectalkDriver, litetalkDriver, doubletalkDriver or tripletalkDriver: driver=speechdDriver
 #driver=genericDriver
+#driver=dectalkDriver
+#driver=litetalkDriver
+#driver=doubletalkDriver
+#driver=tripletalkDriver
 
 This Selects the driver used to generate speech output.
 
@@ -1677,6 +1681,29 @@ the pico module:
 language=de-DE
 ....
 
+Hardware speech drivers use a serial device. The default `+auto+` checks
+`+/dev/ttyACM*+` first, then `+/dev/ttyUSB*+`. Set an explicit path for
+stable systems.
+
+....
+hardware_device=auto
+hardware_device=/dev/ttyACM0
+hardware_device=/dev/ttyUSB0
+hardware_device=/dev/ttyS0
+....
+
+Hardware speech drivers use 9600 baud by default.
+
+....
+hardware_baud_rate=9600
+....
+
+The `+doubletalkDriver+` targets DoubleTalk LT-style serial devices. It does
+not support the internal DoubleTalk PC ISA card.
+USB hardware speech synthesizers are supported only when Linux exposes them as
+a serial tty such as `+/dev/ttyACM0+` or `+/dev/ttyUSB0+`. USB-only TripleTalk
+models with no tty device need a separate driver.
+
 Read new text as it occurs auto_read_incoming=True Values: on=`+True+`,
 off=`+False+`
 

docs/user.md

@@ -100,6 +100,8 @@ driver=speechdDriver
 rate=0.5
 pitch=0.5
 volume=1.0
+hardware_device=auto
+hardware_baud_rate=9600
 
 [sound] 
 enabled=True
@@ -330,6 +332,19 @@ Fenrir automatically detects and provides audio feedback for progress indicators
 ### Speech Drivers
 - **speechdDriver** - Speech-dispatcher (recommended)
 - **genericDriver** - Command-line TTS (espeak, etc.)
+- **dectalkDriver** - Serial DECtalk-compatible hardware speech
+- **litetalkDriver** - Serial LiteTalk-compatible hardware speech
+- **doubletalkDriver** - Serial DoubleTalk LT-compatible hardware speech
+- **tripletalkDriver** - Serial TripleTalk-compatible hardware speech
+
+For hardware speech, set `speech#hardware_device` to `auto` or an explicit
+serial path. RPITalk gadget mode usually appears as `/dev/ttyACM0`; USB serial
+adapters usually appear as `/dev/ttyUSB0`; built-in serial ports may be
+`/dev/ttyS0`. The default baud rate is `9600`. `doubletalkDriver` targets
+DoubleTalk LT-style serial devices, not the internal DoubleTalk PC ISA card.
+USB TripleTalk devices work only if Linux exposes them as a serial tty such as
+`/dev/ttyACM0` or `/dev/ttyUSB0`; USB-only models with no tty device need a
+separate driver.
 
 ### Sound Drivers  
 - **genericDriver** - Sox-based (default)

docs/user.txt

@@ -878,10 +878,13 @@ Turn speech on or off:
   enabled=True
 Values: on=''True'', off=''False''
 
-# Select speech driver, options are speechdDriver (default), genericDriver or espeakDriver:
+# Select speech driver, options are speechdDriver (default), genericDriver, dectalkDriver, litetalkDriver, doubletalkDriver or tripletalkDriver:
 driver=speechdDriver
-#driver=espeakDriver
 #driver=genericDriver
+#driver=dectalkDriver
+#driver=litetalkDriver
+#driver=doubletalkDriver
+#driver=tripletalkDriver
 
 Select the driver used to generate speech output.
 
@@ -890,7 +893,10 @@ Select the driver used to generate speech output.
 Available Drivers:
   * ''genericDriver'' using the generic driver, for Fenrir <1.5 this is not available
   * ''speechdDriver'' using speech-dispatcher, for Fenrir <1.5 just use ''speechd''
-  * ''espeakDriver'' using the espeak directly, for Fenrir <1.5 just use ''espeak''
+  * ''dectalkDriver'' using DECtalk-compatible serial hardware or RPITalk
+  * ''litetalkDriver'' using LiteTalk-compatible serial hardware or RPITalk
+  * ''doubletalkDriver'' using DoubleTalk LT-compatible serial hardware
+  * ''tripletalkDriver'' using TripleTalk-compatible serial hardware
 
 The rate selects how fast Fenrir will speak. 
   rate=0.65
@@ -921,6 +927,18 @@ Select the language you want Fenrir to use.
   language=english-us
 Values: Text, see your TTS synths documentation what is available.
 
+Hardware speech drivers use a serial device. The default ''auto'' checks /dev/ttyACM* first, then /dev/ttyUSB*. Set an explicit path for stable systems.
+  hardware_device=auto
+  hardware_device=/dev/ttyACM0
+  hardware_device=/dev/ttyUSB0
+  hardware_device=/dev/ttyS0
+
+Hardware speech drivers use 9600 baud by default.
+  hardware_baud_rate=9600
+
+The doubletalkDriver targets DoubleTalk LT-style serial devices. It does not support the internal DoubleTalk PC ISA card.
+USB hardware speech synthesizers are supported only when Linux exposes them as a serial tty such as /dev/ttyACM0 or /dev/ttyUSB0. USB-only TripleTalk models with no tty device need a separate driver.
+
 Read new text as it occurs
 auto_read_incoming=True
 Values: on=''True'', off=''False''