I'm trying to wrap my head around the APP_USBD driver, but I'm running into a mental block. I am implementing a report descriptor for the Battery System usage page, and all of the characteristics are features. So would I use an in or out endpoint? or both? I'm in the middle of trying this now and I'm not getting an error, but I'm not seeing the endpoint on the host either - so I'm not sure if this is caused by the endpoint definition or the report.
It has also lead me down a bit of a rabbit hole. I actually have a composite device with two endpoints working nicely (joystick and keyboard). When I was adding on this third piece, I remembered that the default keyboard descriptor from the example has an output in it, but there is only an in endpoint. So this has me feeling like I don't understand what's going on. Shouldn't there also have to be an out endpoint for the keyboard to get the output from the host? I thought I would try it, but when I added an out endpoint, the GLOBAL_DEF macro didn't like it and I'm not sure why:
#define HID_KEYBOARD_EPIN NRF_DRV_USBD_EPIN(2)
#define HID_KEYBOARD_EPOUT NRF_DRV_USBD_EPOUT(1)
#define ENDPOINT_LIST_KEYBOARD() \
( \
HID_KEYBOARD_EPIN, \
HID_KEYBOARD_EPOUT \
)
APP_USBD_HID_KBD_GLOBAL_DEF(m_app_hid_keyboard,
HID_KEYBOARD_INTERFACE,
ENDPOINT_LIST_KEYBOARD(),
hid_kbd_user_ev_handler,
APP_USBD_HID_SUBCLASS_NONE);
gives an "initializer element is not constant" error:
7> Compiling ‘main.c’ 7> In file included from ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd.h:58, 7> from C:\some_path\main.c:96: 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd_internal.h:116:1: error: initializer element is not constant 7> ../../../../../../components/libraries/util/app_util.h:712:37: note: in expansion of macro 'APP_USBD_HID_KBD_INTERVAL' 7> ../../../../../../components/libraries/util/nordic_common.h:118:31: note: in expansion of macro 'MACRO_MAP_1' 7> ../../../../../../components/libraries/util/app_util.h:700:29: note: in expansion of macro 'MACRO_MAP_N_' 7> ../../../../../../components/libraries/util/app_util.h:679:25: note: in expansion of macro 'MACRO_MAP_N' 7> ../../../../../../components/libraries/util/app_util.h:678:24: note: in expansion of macro 'MACRO_MAP_' 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd_internal.h:167:52: note: in expansion of macro 'MACRO_MAP' 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd.h:233:9: note: in expansion of macro 'APP_USBD_HID_KBD_GLOBAL_DEF_INTERNAL' 7> C:\some_path\main.c:619:1: note: in expansion of macro 'APP_USBD_HID_KBD_GLOBAL_DEF' 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd_internal.h:116:1: note: (near initialization for 'm_app_hid_keyboard_ep') 7> ../../../../../../components/libraries/util/app_util.h:712:37: note: in expansion of macro 'APP_USBD_HID_KBD_INTERVAL' 7> ../../../../../../components/libraries/util/nordic_common.h:118:31: note: in expansion of macro 'MACRO_MAP_1' 7> ../../../../../../components/libraries/util/app_util.h:700:29: note: in expansion of macro 'MACRO_MAP_N_' 7> ../../../../../../components/libraries/util/app_util.h:679:25: note: in expansion of macro 'MACRO_MAP_N' 7> ../../../../../../components/libraries/util/app_util.h:678:24: note: in expansion of macro 'MACRO_MAP_' 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd_internal.h:167:52: note: in expansion of macro 'MACRO_MAP' 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd.h:233:9: note: in expansion of macro 'APP_USBD_HID_KBD_GLOBAL_DEF_INTERNAL' 7> C:\some_path\main.c:619:1: note: in expansion of macro 'APP_USBD_HID_KBD_GLOBAL_DEF' 7> In file included from ../../../../../../components/libraries/usbd/app_usbd.h:46, 7> from C:\some_path\main.c:92: 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:463:18: error: initializer element is not constant 7> ../../../../../../components/libraries/util/app_util.h:747:41: note: in expansion of macro 'APP_USBD_CLASS_IFACE_EP_EXTRACT_1__' 7> ../../../../../../components/libraries/util/nordic_common.h:118:31: note: in expansion of macro 'MACRO_MAP_REC_1' 7> ../../../../../../components/libraries/util/app_util.h:708:33: note: in expansion of macro 'MACRO_MAP_REC_N_' 7> ../../../../../../components/libraries/util/app_util.h:687:29: note: in expansion of macro 'MACRO_MAP_REC_N' 7> ../../../../../../components/libraries/util/app_util.h:686:28: note: in expansion of macro 'MACRO_MAP_REC_' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:460:17: note: in expansion of macro 'MACRO_MAP_REC' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:457:17: note: in expansion of macro 'APP_USBD_CLASS_IFACE_EP_EXTRACT_1_' 7> ../../../../../../components/libraries/util/nordic_common.h:118:31: note: in expansion of macro 'APP_USBD_CLASS_IFACE_EP_EXTRACT_1' 7> ../../../../../../components/libraries/util/nordic_common.h:116:31: note: in expansion of macro 'CONCAT_2_' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:440:9: note: in expansion of macro 'CONCAT_2' 7> ../../../../../../components/libraries/util/app_util.h:712:37: note: in expansion of macro 'APP_USBD_CLASS_IFACE_EP_EXTRACT_' 7> ../../../../../../components/libraries/util/nordic_common.h:118:31: note: in expansion of macro 'MACRO_MAP_1' 7> ../../../../../../components/libraries/util/app_util.h:700:29: note: in expansion of macro 'MACRO_MAP_N_' 7> ../../../../../../components/libraries/util/app_util.h:679:25: note: in expansion of macro 'MACRO_MAP_N' 7> ../../../../../../components/libraries/util/app_util.h:678:24: note: in expansion of macro 'MACRO_MAP_' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:583:5: note: in expansion of macro 'MACRO_MAP' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:811:29: note: in expansion of macro 'APP_USBD_CLASS_IFACES_EP_EXTRACT' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:946:9: note: in expansion of macro 'APP_USBD_CLASS_INSTANCE_INITVAL' 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd_internal.h:169:5: note: in expansion of macro 'APP_USBD_CLASS_INST_GLOBAL_DEF' 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd.h:233:9: note: in expansion of macro 'APP_USBD_HID_KBD_GLOBAL_DEF_INTERNAL' 7> C:\some_path\main.c:619:1: note: in expansion of macro 'APP_USBD_HID_KBD_GLOBAL_DEF' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:463:18: note: (near initialization for 'm_app_hid_keyboard.specific.iface.ep[0].address') 7> ../../../../../../components/libraries/util/app_util.h:747:41: note: in expansion of macro 'APP_USBD_CLASS_IFACE_EP_EXTRACT_1__' 7> ../../../../../../components/libraries/util/nordic_common.h:118:31: note: in expansion of macro 'MACRO_MAP_REC_1' 7> ../../../../../../components/libraries/util/app_util.h:708:33: note: in expansion of macro 'MACRO_MAP_REC_N_' 7> ../../../../../../components/libraries/util/app_util.h:687:29: note: in expansion of macro 'MACRO_MAP_REC_N' 7> ../../../../../../components/libraries/util/app_util.h:686:28: note: in expansion of macro 'MACRO_MAP_REC_' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:460:17: note: in expansion of macro 'MACRO_MAP_REC' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:457:17: note: in expansion of macro 'APP_USBD_CLASS_IFACE_EP_EXTRACT_1_' 7> ../../../../../../components/libraries/util/nordic_common.h:118:31: note: in expansion of macro 'APP_USBD_CLASS_IFACE_EP_EXTRACT_1' 7> ../../../../../../components/libraries/util/nordic_common.h:116:31: note: in expansion of macro 'CONCAT_2_' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:440:9: note: in expansion of macro 'CONCAT_2' 7> ../../../../../../components/libraries/util/app_util.h:712:37: note: in expansion of macro 'APP_USBD_CLASS_IFACE_EP_EXTRACT_' 7> ../../../../../../components/libraries/util/nordic_common.h:118:31: note: in expansion of macro 'MACRO_MAP_1' 7> ../../../../../../components/libraries/util/app_util.h:700:29: note: in expansion of macro 'MACRO_MAP_N_' 7> ../../../../../../components/libraries/util/app_util.h:679:25: note: in expansion of macro 'MACRO_MAP_N' 7> ../../../../../../components/libraries/util/app_util.h:678:24: note: in expansion of macro 'MACRO_MAP_' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:583:5: note: in expansion of macro 'MACRO_MAP' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:811:29: note: in expansion of macro 'APP_USBD_CLASS_IFACES_EP_EXTRACT' 7> ../../../../../../components/libraries/usbd/app_usbd_class_base.h:946:9: note: in expansion of macro 'APP_USBD_CLASS_INSTANCE_INITVAL' 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd_internal.h:169:5: note: in expansion of macro 'APP_USBD_CLASS_INST_GLOBAL_DEF' 7> ../../../../../../components/libraries/usbd/class/hid/kbd/app_usbd_hid_kbd.h:233:9: note: in expansion of macro 'APP_USBD_HID_KBD_GLOBAL_DEF_INTERNAL' 7> C:\some_path\main.c:619:1: note: in expansion of macro 'APP_USBD_HID_KBD_GLOBAL_DEF' Build failed
which I don't understand. How could it not be constant? I got the endpoints the same way I did when there was only one of them.
Anyway, I think maybe I have asked too many questions here, but I'm not 100% if I'm asking the right things so I'm hoping that there is an answer that kind of gets everything since they are related. If this is wrong, I can always break this into different questions. Then I can also make another one for my confusion about what the interface parameter does... :-P
