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/* Copyright 2022
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
#include "gpio.h"
#ifndef JOYSTICK_BUTTON_COUNT
# define JOYSTICK_BUTTON_COUNT 8
#elif JOYSTICK_BUTTON_COUNT > 32
# error Joystick feature only supports up to 32 buttons
#endif
#ifndef JOYSTICK_AXES_COUNT
# define JOYSTICK_AXES_COUNT 4
#elif JOYSTICK_AXES_COUNT > 6
# error Joystick feature only supports up to 6 axes
#endif
#if JOYSTICK_AXES_COUNT == 0 && JOYSTICK_BUTTON_COUNT == 0
# error Joystick feature requires at least one axis or button
#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,
};
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;
void joystick_task(void);
void joystick_flush(void);
void register_joystick_button(uint8_t button);
void unregister_joystick_button(uint8_t button);
int16_t joystick_read_axis(uint8_t axis);
void joystick_read_axes(void);
void joystick_set_axis(uint8_t axis, int16_t value);
void host_joystick_send(joystick_t *joystick);
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