Add support for the use of CM108 for PTT on Mac

.github/workflows/ci.yml

@@ -96,7 +96,7 @@ jobs:
           elif [ "$RUNNER_OS" == "macOS" ]; then
             # just to simplify I use homebrew but
             # we can use macports (latest direwolf is already available as port)
-            brew install portaudio hamlib gpsd
+            brew install portaudio hamlib gpsd hidapi
           elif [ "$RUNNER_OS" == "Windows" ]; then
             # add the folder to PATH
             echo "C:\msys64\mingw32\bin" >> $GITHUB_PATH

CMakeLists.txt

@@ -350,6 +350,17 @@ elseif (HAVE_SNDIO)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_SNDIO")
   endif()
 
+elseif (APPLE)
+  find_package(Portaudio REQUIRED)
+  if(PORTAUDIO_FOUND)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_PORTAUDIO")
+  endif()
+
+  find_package(hidapi REQUIRED)
+  if(HIDAPI_FOUND)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_CM108")
+  endif()
+
 elseif (NOT WIN32 AND NOT CYGWIN)
   find_package(Portaudio REQUIRED)
   if(PORTAUDIO_FOUND)
@@ -375,7 +386,10 @@ add_subdirectory(data)
 # external libraries
 add_subdirectory(${CUSTOM_GEOTRANZ_DIR})
 add_subdirectory(${CUSTOM_REGEX_DIR})
-add_subdirectory(${CUSTOM_HIDAPI_DIR})
+if(NOT APPLE)
+  # Mac builds use the hidapi library, not custom local files
+  add_subdirectory(${CUSTOM_HIDAPI_DIR})
+endif()
 add_subdirectory(${CUSTOM_MISC_DIR})
 
 # direwolf source code and utilities

README.md

@@ -208,13 +208,43 @@ Results will vary depending on your hardware platform and operating system versi
 	sudo yum install direwolf
 
 
-### Macintosh OS X ###
+### Macintosh macOS - Using Homebrew ###
 
-Read the **User Guide** in the [**doc** directory](https://github.com/wb2osz/direwolf/tree/master/doc).   It is more complicated than Linux.
+The following instructions have been verified on macOS Ventura 13.6 (M2) and macOS High Sierra 10.13.6 (Intel).
+
+First make sure that you have the following tools installed on your Mac:
+
+- [Xcode or Xcode Command Line Tools](https://developer.apple.com/xcode/resources/)
+- [Homebrew](https://brew.sh/)
+
+You will need to install the following packages using Homebrew:
+
+	brew install cmake
+	brew install portaudio
+	brew install hidapi
+
+Then follow the same instructions as above for the Linux `git clone` build:
+
+	cd ~
+	git clone https://www.github.com/wb2osz/direwolf
+	cd direwolf
+	git checkout dev
+	mkdir build && cd build
+	cmake ..
+	make -j4
+	sudo make install
+	make install-conf
+
+This gives you the latest development version.  Leave out the "git checkout dev" to get the most recent stable release.
+
+For more information, see the ***User Guide*** in the [**doc** directory](https://github.com/wb2osz/direwolf/tree/master/doc).
 
 If you have problems,  post them to the [Dire Wolf packet TNC](https://groups.io/g/direwolf) discussion group.
 
-You can also install a pre-built version from Mac Ports.  Keeping this up to date depends on volunteers who perform the packaging. This version could lag behind development.
+
+### Macintosh macOS - Prebuilt version ###
+
+You can also install a pre-built version from MacPorts.  Keeping this up to date depends on volunteers who perform the packaging. This version could lag behind development.
 
 	sudo port install direwolf
 

cmake/modules/Findhidapi.cmake

@@ -0,0 +1,44 @@
+# - Try to find hidapi
+#
+#  HIDAPI_FOUND - system has hidapi
+#  HIDAPI_LIBRARIES - location of the library for hidapi
+#  HIDAPI_INCLUDE_DIRS - location of the include files for hidapi
+
+set(HIDAPI_ROOT_DIR
+  "${HIDAPI_ROOT_DIR}"
+  CACHE
+  PATH
+  "Directory to search for hidapi")
+
+# no need to check pkg-config
+
+find_path(HIDAPI_INCLUDE_DIRS
+  NAMES
+  hidapi.h
+  PATHS
+  /usr/local/include
+  /usr/include
+  /opt/local/include
+  HINTS
+  ${HIDAPI_ROOT_DIR}
+  PATH_SUFFIXES
+  hidapi
+  )
+
+find_library(HIDAPI_LIBRARIES
+  NAMES
+  hidapi
+  PATHS
+  /usr/local/lib
+  /usr/lib
+  /usr/lib64
+  /opt/local/lib
+  HINTS
+  ${HIDAPI_ROOT_DIR}
+  )
+
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(HIDAPI DEFAULT_MSG HIDAPI_INCLUDE_DIRS HIDAPI_LIBRARIES)
+
+mark_as_advanced(HIDAPI_INCLUDE_DIRS HIDAPI_LIBRARIES)

conf/generic.conf

@@ -277,20 +277,14 @@
 %C%# Radio-Interface-Guide.pdf  in  https://github.com/wb2osz/direwolf-doc
 %C%# goes into detail about the various options.
 %C%
-%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%# If using a C-Media CM108/CM119 or similar USB Audio Adapter,
+%C%# you can use a GPIO pin for PTT control. This is very convenient
+%C%# because a single USB connection is used for both audio and PTT.
+%C%# Example:
+%C%
+%C%#PTT CM108
+%C%
+%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%#

src/CMakeLists.txt

@@ -11,15 +11,21 @@ include_directories(
   ${SNDIO_INCLUDE_DIRS}
   ${CUSTOM_GEOTRANZ_DIR}
   ${GPIOD_INCLUDE_DIRS}
-  ${CUSTOM_HIDAPI_DIR}
   )
 
 if(WIN32 OR CYGWIN)
   include_directories(
+    ${CUSTOM_HIDAPI_DIR}
     ${CUSTOM_REGEX_DIR}
   )
 endif()
 
+if(APPLE)
+  include_directories(
+    ${HIDAPI_INCLUDE_DIRS}
+  )
+endif()
+
 
 # direwolf
 list(APPEND direwolf_SOURCES
@@ -133,6 +139,7 @@ if(LINUX)
   else() # macOS freebsd
     list(APPEND direwolf_SOURCES
       audio_portaudio.c
+      cm108.c
       )
     if(USE_MACOS_DNSSD)
       list(APPEND direwolf_SOURCES
@@ -474,10 +481,11 @@ 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.
+# Version 1.7 adds it for Windows.  Uses local hidapi code.
+# Post-1.7 adds it for Mac. Uses hidapi library.
 
 # cm108
-if(UDEV_FOUND OR WIN32 OR CYGWIN)
+if(UDEV_FOUND OR WIN32 OR CYGWIN OR HIDAPI_FOUND)
   list(APPEND cm108_SOURCES
     cm108.c
     textcolor.c
@@ -501,6 +509,12 @@ if(UDEV_FOUND OR WIN32 OR CYGWIN)
       )
   endif()
 
+  if (APPLE)
+    target_link_libraries(cm108
+      ${HIDAPI_LIBRARIES}
+      )
+  endif()
+
   if (WIN32 OR CYGWIN)
     target_link_libraries(cm108
       ${HIDAPI_LIBRARIES}
@@ -573,6 +587,6 @@ install(TARGETS ttcalc DESTINATION ${INSTALL_BIN_DIR})
 install(TARGETS kissutil DESTINATION ${INSTALL_BIN_DIR})
 install(TARGETS tnctest DESTINATION ${INSTALL_BIN_DIR})
 install(TARGETS appserver DESTINATION ${INSTALL_BIN_DIR})
-if(UDEV_FOUND OR WIN32 OR CYGWIN)
+if(UDEV_FOUND OR WIN32 OR CYGWIN OR HIDAPI_FOUND)
   install(TARGETS cm108 DESTINATION ${INSTALL_BIN_DIR})
 endif()

src/cm108.c

@@ -138,6 +138,8 @@ int main (void)
 #if __WIN32__
 #include <wchar.h>
 #include "hidapi.h"
+#elif __APPLE__
+#include "hidapi.h"
 #else
 #include <libudev.h>
 #include <sys/types.h>
@@ -240,7 +242,7 @@ static int cm108_write (char *name, int iomask, int iodata);
 
 // Used to process regular expression matching results.
 
-#ifndef __WIN32__
+#if !defined(__WIN32__) && !defined(__APPLE__)
 
 static void substr_se (char *dest, const char *src, int start, int endp1)
 {
@@ -317,7 +319,7 @@ static void usage(void)
 	dw_printf ("Usage:    cm108  [ device-path [ gpio-num ] ]\n");
 	dw_printf ("\n");
 	dw_printf ("With no command line arguments, this will produce a list of\n");
-#if __WIN32__
+#if __WIN32__ || __APPLE__
 	dw_printf ("Human Interface Devices (HID) and indicate which ones can be\n");
 	dw_printf ("used for GPIO PTT.\n");
 #else
@@ -375,11 +377,11 @@ int main (int argc, char **argv)
 
 	num_things = cm108_inventory (things, MAXX_THINGS);
 
-#if __WIN32__
+#if __WIN32__ || __APPLE__
 
-/////////////////////////////////////////////////////
-// Windows - Remove the sound related columns for now.
-/////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////
+// Windows & Mac - Remove the sound related columns for now.
+////////////////////////////////////////////////////////////
 
 	dw_printf ("    VID  PID   %-*s %-*s"
 						"\n", 	(int)sizeof(things[0].product),	"Product",
@@ -539,7 +541,7 @@ int cm108_inventory (struct thing_s *things, int max_things)
 	int num_things = 0;
 	memset (things, 0, sizeof(struct thing_s) * max_things);
 
-#if __WIN32__
+#if __WIN32__ || __APPLE__
 
 	struct hid_device_info *devs, *cur_dev;
 
@@ -779,7 +781,7 @@ void cm108_find_ptt (char *output_audio_device, char *ptt_device,  int ptt_devic
 	// Possible improvement: Skip if inventory already taken.
 	num_things = cm108_inventory (things, MAXX_THINGS);
 
-#if __WIN32__
+#if __WIN32__ || __APPLE__
 		//  FIXME - This is just a half baked implementation.
 		//  I have not been able to figure out how to find the connection
 		//  between the audio device and HID in the same package.
@@ -934,7 +936,7 @@ int cm108_set_gpio_pin (char *name, int num, int state)
 static int cm108_write (char *name, int iomask, int iodata)
 {
 
-#if __WIN32__
+#if __WIN32__ || __APPLE__
 
 	//text_color_set(DW_COLOR_DEBUG);
 	//dw_printf ("TEMP DEBUG cm108_write:  %s %d %d\n", name, iomask, iodata);