Fix second slider

Author: dim13

radio/src/targets/common/arm/stm32/usb_driver.cpp

@@ -180,14 +180,16 @@ void usbJoystickUpdate()
   if (USBD_HID_SendReport(&USB_OTG_dev, 0, 0) == USBD_OK) {
 #endif
 
-    // 8 analog values
+    // 4 axes
     for (int i = 0; i < 8; ++i) {
       int16_t value = channelOutputs[i] + 1024;
       if ( value > 2047 ) value = 2047;
       else if ( value < 0 ) value = 0;
       HID_Buffer[i*2 + 0] = uint8_t(value);
       HID_Buffer[i*2 + 1] = uint8_t(value >> 8);
     }
+    // 2 sliders
+    // 4 switches
 
     // buttons
     HID_Buffer[8*2+1] = 0;

radio/src/targets/common/arm/stm32/usbd_hid_joystick.c

@@ -122,7 +122,7 @@ __ALIGN_BEGIN static const uint8_t HID_JOYSTICK_ReportDesc[] __ALIGN_END =
     0x09, 0x34,                    //         USAGE (Ry)
     0x09, 0x35,                    //         USAGE (Rz)
     0x09, 0x36,                    //         USAGE (Slider)
-    0x09, 0x36,                    //         USAGE (Slider)
+    0x09, 0x37,                    //         USAGE (Slider)
     0x16, 0x00, 0x00,              //         LOGICAL_MINIMUM (0)
     0x26, 0xFF, 0x07,              //         LOGICAL_MAXIMUM (2047)
     0x75, 0x10,                    //         REPORT_SIZE (16)