Handle deadzone, return event type on read_event

Makefile

@@ -2,8 +2,8 @@ TARGET = spnav
 TARGET_LIB = libspnavhdi.so # target lib
 
 CC = gcc
-CFLAGS = -Wall -Wextra -fPIC -pedantic -O2 # C flags for building library
+#CFLAGS = -Wall -Wextra -fPIC -pedantic -O2 # C flags for building library
-#CFLAGS = -Wall -Wextra -pedantic -g # C flags for developpement
+CFLAGS = -Wall -Wextra -pedantic -g # C flags for developpement
 
 LDFLAGS = -Wall -Wextra -O2
 

main.c

@@ -148,7 +148,7 @@ int main(int argc, char const *argv[])
    spnav_event ev;
    spnav_open();
    for (;;) {
-       spnav_wait_event(&ev);
+       spnav_wait_event_timeout(&ev, 400);
        
        switch (ev.type) {
            case MOTION:
@@ -156,6 +156,7 @@ int main(int argc, char const *argv[])
                 printf("rx=%d, ry=%d, rz=%d\n", ev.motion.rx, ev.motion.ry, ev.motion.rz);
                 break;
             case BUTTON:
+                printf("bnum=%d, pressed=%d\n", ev.button.bnum, ev.button.press);
                 break;
        }
 

spnav.c

@@ -37,8 +37,21 @@ int convert_input(int first, unsigned char val) {
     }
 }
 
+bool in_deadzone(unsigned char *data) {
+    /* data[0] is the event type */
+    int i;
+    for (i=1; i<SPNAV_NAXIS; i++) {
+        if (data[i] != 0) {
+            return false;
+        }
+    }
+    DEBUG_PRINT("in_deadzone\n");
+    return true;
+}
+
 int read_event(hid_device *device, spnav_event* ev, int ms) {
     unsigned char buf[64];
+    int i;
     int nbytes = hid_read_timeout(device, buf, sizeof(buf), ms);
     if (nbytes < 0) {
         DEBUG_PRINT("hid_read_timeout() error");
@@ -51,26 +64,42 @@ int read_event(hid_device *device, spnav_event* ev, int ms) {
 
     switch (ev->type) {
         case TRANSLATION:
-            ev->type = 1;
+             if (in_deadzone(buf)) {
+                ev->type = 0;
+                return ev->type;
+            }
+            ev->motion.type = 1;
             ev->motion.x = convert_input((buf[1] & 0x0000ff), buf[2]);
             ev->motion.y = convert_input((buf[3] & 0x0000ff), buf[4]);
             ev->motion.z = convert_input((buf[5] & 0x0000ff), buf[6]);
+            for (i=0; i < SPNAV_NAXIS; i++) {
+                ev->motion.data[i] = buf[i];
+            }
             // DEBUG_PRINT("Translation x=%d, y=%d, z=%d\n", ev->motion.x, ev->motion.y, ev->motion.z);
             break;
         case ROTATION:
-            ev->type = 1;
+            if (in_deadzone(buf)) {
+                ev->type = 0;
+                return ev->type;
+            }
+            ev->motion.type = 1;
             ev->motion.rx = convert_input((buf[1] & 0x0000ff), buf[2]);
             ev->motion.ry = convert_input((buf[3] & 0x0000ff), buf[4]);
             ev->motion.rz = convert_input((buf[5] & 0x0000ff), buf[6]);
+            for (i=0; i < SPNAV_NAXIS; i++) {
+                ev->motion.data[i] = buf[i];
+            }
             // DEBUG_PRINT("Rotation rx=%d, ry=%d, rz=%d\n", ev->motion.rx, ev->motion.ry, ev->motion.rz);
             break;
         case BTN:
-            ev->type = 2;
+            ev->button.type = 2;
-            DEBUG_PRINT("Buttons: %d %d\n", /* btn 1 */buf[1] & 0x01, /* btn 2 */ buf[1] & 0x02);
+            ev->button.press = buf[1] == 0x01;
+            ev->button.bnum = buf[1];
+            //DEBUG_PRINT("Buttons: %d %d\n", /* btn 1 */buf[1] & 0x01, /* btn 2 */ buf[1] & 0x02);
             break;
     }
 
-    return 0;
+    return ev->type;
 }
 
 int set_led(hid_device *dev, char state) {
@@ -81,7 +110,7 @@ int set_led(hid_device *dev, char state) {
                      nbytes, sizeof(led_data));
         return -1;
     }
-    return 0;
+    return nbytes;
 }
 
 int spnav_open() {
@@ -123,17 +152,15 @@ int spnav_wait_event(spnav_event *event) {
         DEBUG_PRINT("spnav_wait_event(): device not connected.\n");
         return -1;
     }
-    read_event(device, event, -1);
+    return read_event(device, event, -1);;
-    return 0;
 }
 
-spnav_wait_event_timeout(spnav_event *event, int milliseconds) {
+int spnav_wait_event_timeout(spnav_event *event, int milliseconds) {
     if (device == NULL) {
         DEBUG_PRINT("spnav_wait_event_timeout(): device not connected.\n");
         return -1;
     }
-    read_event(device, event, milliseconds);
+    return read_event(device, event, milliseconds);;
-    return 0;
 }
 /* 
 int spnav_wait_event(spnav_event *event);

spnav.h

@@ -3,6 +3,7 @@
 
 #define SPNAV_VENDOR_ID 0x046d
 #define SPNAV_PRODUCT_ID 0xc626
+#define SPNAV_NAXIS 6
 
 #ifdef _WIN32
       #define SPNAV_API_EXPORT __declspec(dllexport)
@@ -25,12 +26,12 @@ struct event_motion {
 	int x, y, z;
 	int rx, ry, rz;
 	unsigned int period;
-	int *data;
+	int data[SPNAV_NAXIS];
 };
 
 struct event_button {
 	int type;
-	int press;
+	bool press;
 	int bnum;
 };