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#ifndef HID_H
#define HID_H
struct HID_desc {
uint8_t bLength;
uint8_t bDescriptorType;
uint16_t bcdHID;
uint8_t bCountryCode;
uint8_t bNumDescriptors;
uint8_t bDescriptorType0;
uint16_t wDescriptorLength0;
} __attribute__((packed));
constexpr HID_desc hid_desc(
uint16_t bcdHID,
uint8_t bCountryCode,
uint8_t bNumDescriptors,
uint8_t bDescriptorType,
uint16_t wDescriptorLength
) {
return {
sizeof(HID_desc),
0x21,
bcdHID,
bCountryCode,
bNumDescriptors,
bDescriptorType,
wDescriptorLength
};
}
template <typename T>
struct HID_Item {
uint8_t tag;
T data;
} __attribute__((packed));
template <>
struct HID_Item<void> {
uint8_t tag;
} __attribute__((packed));
constexpr HID_Item<void> hid_item(uint8_t tag) {
return {tag};
}
template <typename T>
constexpr uint8_t hid_item_data_size() {
static_assert(sizeof(T) == 1 || sizeof(T) == 2 || sizeof(T) == 4, "item has invalid size");
return sizeof(T) == 1 ? 1 : sizeof(T) == 2 ? 2 : 3;
}
template <typename T>
constexpr HID_Item<T> hid_item(uint8_t tag, T data) {
return HID_Item<T>{uint8_t(tag | hid_item_data_size<T>()), data};
}
namespace UsagePage {
enum _8 : uint8_t {
Undefined,
Desktop,
Simulation,
VR,
Sport,
Game,
Generic,
Keyboard,
LED,
Button,
Ordinal,
};
}
constexpr HID_Item<UsagePage::_8> usage_page(UsagePage::_8 page) {
return hid_item(0x04, page);
}
constexpr HID_Item<uint16_t> usage_page(uint16_t page) {
return hid_item(0x04, page);
}
namespace DesktopUsage {
enum _8 : uint8_t {
Undefined,
Gamepad = 0x05,
X = 0x30,
Y,
Z,
Rx,
Ry,
Rz,
};
}
enum class Collection : uint8_t {
Physical,
Application,
Logical,
};
constexpr HID_Item<DesktopUsage::_8> usage(DesktopUsage::_8 usage) {
return hid_item(0x08, usage);
}
constexpr HID_Item<uint16_t> usage(uint16_t usage) {
return hid_item(0x08, usage);
}
template <typename... R>
constexpr auto collection(Collection type, R... r) -> decltype(pack(HID_Item<Collection>(), r..., HID_Item<void>())) {
return pack(hid_item(0xa0, type), r..., hid_item(0xc0));
}
constexpr HID_Item<int16_t> usage_minimum(int16_t x) {
return hid_item(0x18, x);
}
constexpr HID_Item<int16_t> usage_maximum(int16_t x) {
return hid_item(0x28, x);
}
constexpr HID_Item<int32_t> logical_minimum(int32_t x) {
return hid_item(0x14, x);
}
constexpr HID_Item<int32_t> logical_maximum(int32_t x) {
return hid_item(0x24, x);
}
constexpr HID_Item<uint8_t> report_count(uint8_t x) {
return hid_item(0x94, x);
}
constexpr HID_Item<uint8_t> report_size(uint8_t x) {
return hid_item(0x74, x);
}
constexpr HID_Item<uint8_t> input(uint8_t x) {
return hid_item(0x80, x);
}
constexpr HID_Item<uint8_t> output(uint8_t x) {
return hid_item(0x90, x);
}
constexpr HID_Item<uint8_t> feature(uint8_t x) {
return hid_item(0xb0, x);
}
constexpr HID_Item<uint8_t> report_id(uint8_t id) {
return hid_item(0x84, id);
}
template <typename... R>
constexpr auto gamepad(R... r) -> decltype(
pack(
usage_page(UsagePage::Desktop),
usage(DesktopUsage::Gamepad),
collection(Collection::Application,
collection(Collection::Physical,
r...
)
)
)) {
return pack(
usage_page(UsagePage::Desktop),
usage(DesktopUsage::Gamepad),
collection(Collection::Application,
collection(Collection::Physical,
r...
)
)
);
}
constexpr auto buttons(uint8_t num) -> decltype(
pack(
usage_page(UsagePage::Button),
usage_minimum(1),
usage_maximum(num),
logical_minimum(0),
logical_maximum(1),
report_count(num),
report_size(1),
input(0x02)
)) {
return pack(
usage_page(UsagePage::Button),
usage_minimum(1),
usage_maximum(num),
logical_minimum(0),
logical_maximum(1),
report_count(num),
report_size(1),
input(0x02)
);
}
constexpr auto padding_in(uint8_t size) -> decltype(
pack(
report_count(1),
report_size(size),
input(0x01)
)) {
return pack(
report_count(1),
report_size(size),
input(0x01)
);
}
constexpr auto padding_out(uint8_t size) -> decltype(
pack(
report_count(1),
report_size(size),
output(0x01)
)) {
return pack(
report_count(1),
report_size(size),
output(0x01)
);
}
#endif
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