Updated 03 Mar 2023
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See the code block example for an implementation of the OpenJoyPad HID report as a C struct.
// Structure for OpenJoyPad USB input report Data // Has a length of 10 bytes typedef struct { uint8_t report_id; union { struct { uint8_t button_y : 1; uint8_t button_b : 1; uint8_t button_a : 1; uint8_t button_x : 1; uint8_t trigger_l : 1; uint8_t trigger_r : 1; uint8_t trigger_zl : 1; uint8_t trigger_zr : 1; }; uint8_t buttons_1; }; union { struct { uint8_t button_minus : 1; uint8_t button_plus : 1; uint8_t stick_left : 1; uint8_t stick_right : 1; uint8_t button_home : 1; uint8_t button_capture: 1; uint8_t padding : 2; }; uint8_t buttons_2; }; uint8_t dpad_hat; uint8_t stick_left_x; uint8_t stick_left_y; uint8_t stick_right_x; uint8_t stick_right_y; uint8_t analog_trigger_l; uint8_t analog_trigger_r; } __attribute__ ((packed)) openjoypad_input_s;
See the enumerator table below for definitions you can use to ensure your D-Pad output values are correct.
typedef enum { JP_HAT_TOP = 0x00, JP_HAT_TOP_RIGHT = 0x01, JP_HAT_RIGHT = 0x02, JP_HAT_BOTTOM_RIGHT = 0x03, JP_HAT_BOTTOM = 0x04, JP_HAT_BOTTOM_LEFT = 0x05, JP_HAT_LEFT = 0x06, JP_HAT_TOP_LEFT = 0x07, JP_HAT_CENTER = 0x08, } jp_input_hat_dir_t;