Try to add get settings command

.vscode/launch.json

@@ -9,7 +9,7 @@
             "type": "cppdbg",
             "request": "launch",
             "program": "${workspaceFolder}/pikon",
-            "args": ["-p", "/dev/ttyUSB0", "fire_shutter"],
+            "args": ["-p", "/dev/ttyUSB0", "get_settings"],
             "stopAtEntry": false,
             "cwd": "${workspaceFolder}",
             "environment": [],
@@ -28,7 +28,7 @@
             "type": "cppdbg",
             "request": "launch",
             "program": "${workspaceFolder}/pikon",
-            "args": ["-p", "/dev/ttyUSB0", "fire_shutter"],
+            "args": ["-p", "/dev/ttyUSB0", "get_settings"],
             "stopAtEntry": true,
             "cwd": "${workspaceFolder}",
             "environment": [],

src/main.cpp

@@ -11,6 +11,7 @@ struct Options {
 void identify_camera(Options const &opt);
 void focus(Options const &opt);
 void fireShutter(Options const &opt);
+void getCameraSettings(Options const &opt);
 
 int main(int argc, char **argv) {
     CLI::App app("Pikon DataLink");
@@ -31,6 +32,9 @@ int main(int argc, char **argv) {
     CLI::App *cmdFireShutter = app.add_subcommand("fire_shutter", "fire shutter");
     cmdFireShutter->callback([opts]() { fireShutter(*opts); });
 
+    CLI::App *cmdGetSettings = app.add_subcommand("get_settings", "get settings");
+    cmdGetSettings->callback([opts]() { getCameraSettings(*opts); });
+
 
     app.require_subcommand();
 
@@ -84,4 +88,23 @@ void fireShutter(Options const &opt) {
     dl.fireShutter();
 
     dl.endSession();
-} 
+} 
+
+void getCameraSettings(Options const &opt) {
+    NikonDatalink dl(opt.serialPort);
+
+    if (opt.debug) {
+        dl.setLogLevel(LOG_DEBUG);
+    } else {
+        dl.setLogLevel(LOG_INFO);
+    }
+
+    dl.startSession();
+
+    // should switch baudrate before getting infos
+
+    CameraControlGlobals *cameraControls = NULL;
+    cameraControls = dl.getCameraSettings();
+
+    dl.endSession();
+}

src/nikonDatalink.cpp

@@ -662,4 +662,39 @@ void NikonDatalink::fireShutter() {
  */
 int NikonDatalink::getSessionError() {
     return sessionErr;
+}
+
+CameraControlGlobals *NikonDatalink::getCameraSettings() {
+    // should we do something like CameraFormInit of CameraControl.c
+
+    int  err, endErr = 0;
+    CameraControlGlobals *sCCG;
+
+    sCCG->valid = false;
+
+    sendCommand(kReadDataMode, 0x0000FD21, &(sCCG->locationFD21), 1);
+	sendCommand(kReadDataMode, 0x0000FD25, &(sCCG->locationFD25), 9);
+	sendCommand(kReadDataMode, 0x0000FD3A, &(sCCG->locationFD3A), 4);
+	sendCommand(kReadDataMode, 0x0000FD89, &(sCCG->locationFD89), 1);
+	sendCommand(kReadDataMode, 0x0000FD8E, &(sCCG->locationFD8E), 3);
+	sendCommand(kReadDataMode, 0x0000FE20, &(sCCG->locationFE20), 21);
+	sendCommand(kReadDataMode, 0x0000FE3A, &(sCCG->locationFE3A), 1);
+	sendCommand(kReadDataMode, 0x0000FE4F, &(sCCG->locationFE4F), 3);
+	sendCommand(kReadDataMode, 0x0000FD9D, &(sCCG->locationFD9D), 1);
+
+    if ((err = getSessionError()) != 0) goto ERROR;
+
+    sCCG->valid = true;
+
+    return sCCG;
+
+ERROR:
+    endErr = endSession();
+
+    if (err == 0) err = endErr;
+
+    // log error somehow
+
+    return NULL;
+
 }

src/nikonDatalink.h

@@ -36,6 +36,7 @@ class NikonDatalink {
         void fireShutter();
         int getSessionError();
         bool switchBaudrate();
+        CameraControlGlobals *getCameraSettings();
 
         const char *serialPortName;
 

src/nikonPackets.h

@@ -138,3 +138,59 @@ typedef struct {
         unsigned int    byteCount;
 } MemoHolderResponse;
 #define kMemoHolderResponseSize 4
+
+typedef struct CameraControlGlobals {
+	unsigned char	valid;
+	unsigned char	locationFD21;
+	
+	unsigned char	locationFD25;
+	unsigned char	locationFD26;
+	unsigned char	locationFD27;
+	unsigned char	locationFD28;
+	unsigned char	locationFD29;
+	unsigned char	locationFD2A;
+	unsigned char	locationFD2B;
+	unsigned char	locationFD2C;
+	unsigned char	locationFD2D;
+	
+	unsigned char	locationFD3A;
+	unsigned char	locationFD3B;
+	unsigned char	locationFD3C;
+	unsigned char	locationFD3D;
+	
+	unsigned char	locationFD89;
+	
+	unsigned char	locationFD8E;
+	unsigned char	locationFD8F;
+	unsigned char	locationFD90;
+	
+	unsigned char	locationFD9D;
+	
+	unsigned char	locationFE20;
+	unsigned char	locationFE21;
+	unsigned char	locationFE22;
+	unsigned char	locationFE23;
+	unsigned char	locationFE24;
+	unsigned char	locationFE25;
+	unsigned char	locationFE26;
+	unsigned char	locationFE27;
+	unsigned char	locationFE28;
+	unsigned char	locationFE29;
+	unsigned char	locationFE2A;
+	unsigned char	locationFE2B;
+	unsigned char	locationFE2C;
+	unsigned char	locationFE2D;
+	unsigned char	locationFE2E;
+	unsigned char	locationFE2F;
+	unsigned char	locationFE30;
+	unsigned char	locationFE31;
+	unsigned char	locationFE32;
+	unsigned char	locationFE33;
+	unsigned char	locationFE34;
+	
+	unsigned char	locationFE3A;
+	
+	unsigned char	locationFE4F;
+	unsigned char	locationFE50;
+	unsigned char	locationFE51;
+} CameraControlGlobals;