qmk_firmware/quantum/joystick.h
Chris Broekema c4b03509da
Save a single byte of memory for joystick buttons (#15555)
Co-authored-by: Joel Challis <git@zvecr.com>
2021-12-24 14:31:15 -08:00

63 lines
1.8 KiB
C

#pragma once
#include "quantum.h"
#include <stdint.h>
#ifndef JOYSTICK_BUTTON_COUNT
# define JOYSTICK_BUTTON_COUNT 8
#endif
#ifndef JOYSTICK_AXES_COUNT
# define JOYSTICK_AXES_COUNT 4
#endif
#ifndef JOYSTICK_AXES_RESOLUTION
# define JOYSTICK_AXES_RESOLUTION 8
#elif JOYSTICK_AXES_RESOLUTION < 8 || JOYSTICK_AXES_RESOLUTION > 16
# error JOYSTICK_AXES_RESOLUTION must be between 8 and 16
#endif
#define JOYSTICK_RESOLUTION ((1L << (JOYSTICK_AXES_RESOLUTION - 1)) - 1)
// configure on input_pin of the joystick_axes array entry to JS_VIRTUAL_AXIS
// to prevent it from being read from the ADC. This allows outputing forged axis value.
//
#define JS_VIRTUAL_AXIS 0xFF
#define JOYSTICK_AXIS_VIRTUAL \
{ JS_VIRTUAL_AXIS, JS_VIRTUAL_AXIS, JS_VIRTUAL_AXIS, 0, 1023 }
#define JOYSTICK_AXIS_IN(INPUT_PIN, LOW, REST, HIGH) \
{ JS_VIRTUAL_AXIS, INPUT_PIN, JS_VIRTUAL_AXIS, LOW, REST, HIGH }
#define JOYSTICK_AXIS_IN_OUT(INPUT_PIN, OUTPUT_PIN, LOW, REST, HIGH) \
{ OUTPUT_PIN, INPUT_PIN, JS_VIRTUAL_AXIS, LOW, REST, HIGH }
#define JOYSTICK_AXIS_IN_OUT_GROUND(INPUT_PIN, OUTPUT_PIN, GROUND_PIN, LOW, REST, HIGH) \
{ OUTPUT_PIN, INPUT_PIN, GROUND_PIN, LOW, REST, HIGH }
typedef struct {
pin_t output_pin;
pin_t input_pin;
pin_t ground_pin;
// the AVR ADC offers 10 bit precision, with significant bits on the higher part
uint16_t min_digit;
uint16_t mid_digit;
uint16_t max_digit;
} joystick_config_t;
extern joystick_config_t joystick_axes[JOYSTICK_AXES_COUNT];
enum joystick_status { JS_INITIALIZED = 1, JS_UPDATED = 2 };
typedef struct {
uint8_t buttons[(JOYSTICK_BUTTON_COUNT - 1) / 8 + 1];
int16_t axes[JOYSTICK_AXES_COUNT];
uint8_t status : 2;
} joystick_t;
extern joystick_t joystick_status;
// to be implemented in the hid protocol library
void send_joystick_packet(joystick_t *joystick);