Limited support for CM108/CM119 GPIO PTT on Windows.

Author: wb2osz

CHANGES.md

@@ -7,6 +7,8 @@
 
 ### New Features: ###
 
+- Limited support for CM109/CM119 GPIO PTT on Windows.
+
 - Dire Wolf now advertises itself using DNS Service Discovery.  This allows suitable APRS / Packet Radio applications to find a network KISS TNC without knowing the IP address or TCP port.    Thanks to Hessu for providing this.  Currently available only for Linux and Mac OSX.  [Read all about it here.](https://github.com/hessu/aprs-specs/blob/master/TCP-KISS-DNS-SD.md)
 
 - The transmit calibration tone (-x) command line option now accepts a radio channel number and/or a single letter mode:  a = alternate tones, m = mark tone, s = space tone, p = PTT only no sound.

CMakeLists.txt

@@ -72,6 +72,7 @@ set(CUSTOM_SRC_DIR "${CMAKE_SOURCE_DIR}/src")
 set(CUSTOM_EXTERNAL_DIR "${CMAKE_SOURCE_DIR}/external")
 set(CUSTOM_MISC_DIR "${CUSTOM_EXTERNAL_DIR}/misc")
 set(CUSTOM_REGEX_DIR "${CUSTOM_EXTERNAL_DIR}/regex")
+set(CUSTOM_HIDAPI_DIR "${CUSTOM_EXTERNAL_DIR}/hidapi")
 set(CUSTOM_GEOTRANZ_DIR "${CUSTOM_EXTERNAL_DIR}/geotranz")
 set(CUSTOM_DATA_DIR "${CMAKE_SOURCE_DIR}/data")
 set(CUSTOM_SCRIPTS_DIR "${CMAKE_SOURCE_DIR}/scripts")
@@ -321,6 +322,7 @@ add_subdirectory(data)
 # external libraries
 add_subdirectory(${CUSTOM_GEOTRANZ_DIR})
 add_subdirectory(${CUSTOM_REGEX_DIR})
+add_subdirectory(${CUSTOM_HIDAPI_DIR})
 add_subdirectory(${CUSTOM_MISC_DIR})
 
 # direwolf source code and utilities

cmake/modules/FindCPUflags.cmake

@@ -78,7 +78,6 @@ endfunction()
 # The default will be set for maximum portability so packagers won't need to
 # to anything special.
 #
-set(FORCE_SSE 1)
 #
 # While ENABLE_GENERIC also had the desired result (for x86_64), I don't think
 # it is the right approach.  It prevents the detection of the architecture,

conf/generic.conf

@@ -263,10 +263,22 @@
 %C%
 %C%#DTMF
 %C%
-%C%#
-%C%# If not using a VOX circuit, the transmitter Push to Talk (PTT)
-%C%# control is usually wired to a serial port with a suitable interface circuit.
-%C%# DON'T connect it directly!
+%L%# If using a C-Media CM108/CM119 or similar USB Audio Adapter,
+%L%# you can use a GPIO pin for PTT control. This is very convenient
+%L%# because a single USB connection is used for both audio and PTT.
+%L%# Example:
+%L%
+%L%#PTT CM108
+%L%
+%W%# If using a C-Media CM108/CM119 or similar USB Audio Adapter,
+%W%# you can use a GPIO pin for PTT control. This is very convenient
+%W%# because a single USB connection is used for both audio and PTT.
+%W%# Example:
+%W%
+%W%#PTT CM108
+%W%%C%#
+%C%# The transmitter Push to Talk (PTT) control can be wired to a serial port
+%C%# with a suitable interface circuit.  DON'T connect it directly!
 %C%#
 %C%# For the PTT command, specify the device and either RTS or DTR.
 %C%# RTS or DTR may be preceded by "-" to invert the signal.

src/CMakeLists.txt

@@ -9,6 +9,7 @@ include_directories(
   ${UDEV_INCLUDE_DIRS}
   ${PORTAUDIO_INCLUDE_DIRS}
   ${CUSTOM_GEOTRANZ_DIR}
+  ${CUSTOM_HIDAPI_DIR}
   )
 
 if(WIN32 OR CYGWIN)
@@ -106,6 +107,7 @@ if(LINUX)
   elseif(WIN32 OR CYGWIN) # windows
     list(APPEND direwolf_SOURCES
       audio_win.c
+      cm108.c
 
       # icon
       # require plain gcc binary or link
@@ -134,6 +136,7 @@ target_link_libraries(direwolf
   ${GEOTRANZ_LIBRARIES}
   ${MISC_LIBRARIES}
   ${REGEX_LIBRARIES}
+  ${HIDAPI_LIBRARIES}
   Threads::Threads
   ${GPSD_LIBRARIES}
   ${HAMLIB_LIBRARIES}
@@ -147,7 +150,7 @@ if(WIN32 OR CYGWIN)
   set_target_properties(direwolf
     PROPERTIES COMPILE_FLAGS "-DUSE_REGEX_STATIC"
     )
-  target_link_libraries(direwolf winmm ws2_32)
+  target_link_libraries(direwolf winmm ws2_32 setupapi)
 endif()
 
 # decode_aprs
@@ -413,8 +416,11 @@ endif()
 
 
 # List USB audio adapters than can use GPIO for PTT.
+# Originally for Linux only (using udev).
+# Version 1.7 adds it for Windows.  Needs hidapi library.
+
 # cm108
-if(UDEV_FOUND)
+if(UDEV_FOUND OR WIN32 OR CYGWIN)
   list(APPEND cm108_SOURCES
     cm108.c
     textcolor.c
@@ -430,8 +436,21 @@ if(UDEV_FOUND)
 
   target_link_libraries(cm108
     ${MISC_LIBRARIES}
-    ${UDEV_LIBRARIES}
     )
+
+  if (LINUX)
+    target_link_libraries(cm108
+      ${UDEV_LIBRARIES}
+      )
+  endif()
+
+  if (WIN32 OR CYGWIN)
+    target_link_libraries(cm108
+      ${HIDAPI_LIBRARIES}
+      ws2_32
+      setupapi
+      )
+  endif()
 endif()
 
 
@@ -496,6 +515,6 @@ install(TARGETS atest DESTINATION ${INSTALL_BIN_DIR})
 install(TARGETS ttcalc DESTINATION ${INSTALL_BIN_DIR})
 install(TARGETS kissutil DESTINATION ${INSTALL_BIN_DIR})
 install(TARGETS appserver DESTINATION ${INSTALL_BIN_DIR})
-if(UDEV_FOUND)
+if(UDEV_FOUND OR WIN32 OR CYGWIN)
   install(TARGETS cm108 DESTINATION ${INSTALL_BIN_DIR})
 endif()

src/audio.h

@@ -240,23 +240,25 @@ struct audio_s {
 
 	        ptt_method_t ptt_method; /* none, serial port, GPIO, LPT, HAMLIB, CM108. */
 
-	        char ptt_device[100];	/* Serial device name for PTT.  e.g. COM1 or /dev/ttyS0 */
+	        char ptt_device[128];	/* Serial device name for PTT.  e.g. COM1 or /dev/ttyS0 */
 					/* Also used for HAMLIB.  Could be host:port when model is 1. */
 					/* For years, 20 characters was plenty then we start getting extreme names like this: */
 					/* /dev/serial/by-id/usb-FTDI_Navigator__CAT___2nd_PTT__00000000-if00-port0 */
 					/* /dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller_D-if00-port0 */
 					/* Issue 104, changed to 100 bytes in version 1.5. */
 
-					/* This same field is also used for CM108 GPIO PTT which will */
-					/* have a name like /dev/hidraw1. */
+					/* This same field is also used for CM108/CM119 GPIO PTT which will */
+					/* have a name like /dev/hidraw1 for Linux or */
+					/* \\?\hid#vid_0d8c&pid_0008&mi_03#8&39d3555&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030} */
+					/* for Windows.  Largest observed was 95 but add some extra to be safe. */
 
 	        ptt_line_t ptt_line;	/* Control line when using serial port. PTT_LINE_RTS, PTT_LINE_DTR. */
 	        ptt_line_t ptt_line2;	/* Optional second one:  PTT_LINE_NONE when not used. */
 
 	        int out_gpio_num;	/* GPIO number.  Originally this was only for PTT. */
 					/* It is now more general. */
 					/* octrl array is indexed by PTT, DCD, or CONnected indicator. */
-					/* For CM108, this should be in range of 1-8. */
+					/* For CM108/CM119, this should be in range of 1-8. */
 
 #define MAX_GPIO_NAME_LEN 20	// 12 would cover any case I've seen so this should be safe