71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
#pragma once
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#include <stdint.h>
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#include "gpio.h"
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#ifndef JOYSTICK_BUTTON_COUNT
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# define JOYSTICK_BUTTON_COUNT 8
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#elif JOYSTICK_BUTTON_COUNT > 32
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# error Joystick feature only supports up to 32 buttons
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#endif
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#ifndef JOYSTICK_AXES_COUNT
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# define JOYSTICK_AXES_COUNT 4
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#elif JOYSTICK_AXES_COUNT > 6
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# error Joystick feature only supports up to 6 axes
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#endif
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#if JOYSTICK_AXES_COUNT == 0 && JOYSTICK_BUTTON_COUNT == 0
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# error Joystick feature requires at least one axis or button
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#endif
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#ifndef JOYSTICK_AXES_RESOLUTION
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# define JOYSTICK_AXES_RESOLUTION 8
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#elif JOYSTICK_AXES_RESOLUTION < 8 || JOYSTICK_AXES_RESOLUTION > 16
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# error JOYSTICK_AXES_RESOLUTION must be between 8 and 16
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#endif
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#define JOYSTICK_RESOLUTION ((1L << (JOYSTICK_AXES_RESOLUTION - 1)) - 1)
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// configure on input_pin of the joystick_axes array entry to JS_VIRTUAL_AXIS
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// to prevent it from being read from the ADC. This allows outputing forged axis value.
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//
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#define JS_VIRTUAL_AXIS 0xFF
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#define JOYSTICK_AXIS_VIRTUAL \
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{ JS_VIRTUAL_AXIS, JS_VIRTUAL_AXIS, JS_VIRTUAL_AXIS, 0, 1023 }
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#define JOYSTICK_AXIS_IN(INPUT_PIN, LOW, REST, HIGH) \
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{ JS_VIRTUAL_AXIS, INPUT_PIN, JS_VIRTUAL_AXIS, LOW, REST, HIGH }
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#define JOYSTICK_AXIS_IN_OUT(INPUT_PIN, OUTPUT_PIN, LOW, REST, HIGH) \
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{ OUTPUT_PIN, INPUT_PIN, JS_VIRTUAL_AXIS, LOW, REST, HIGH }
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#define JOYSTICK_AXIS_IN_OUT_GROUND(INPUT_PIN, OUTPUT_PIN, GROUND_PIN, LOW, REST, HIGH) \
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{ OUTPUT_PIN, INPUT_PIN, GROUND_PIN, LOW, REST, HIGH }
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typedef struct {
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pin_t output_pin;
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pin_t input_pin;
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pin_t ground_pin;
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// the AVR ADC offers 10 bit precision, with significant bits on the higher part
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uint16_t min_digit;
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uint16_t mid_digit;
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uint16_t max_digit;
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} joystick_config_t;
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extern joystick_config_t joystick_axes[JOYSTICK_AXES_COUNT];
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enum joystick_status { JS_INITIALIZED = 1, JS_UPDATED = 2 };
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typedef struct {
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uint8_t buttons[(JOYSTICK_BUTTON_COUNT - 1) / 8 + 1];
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int16_t axes[JOYSTICK_AXES_COUNT];
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uint8_t status : 2;
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} joystick_t;
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extern joystick_t joystick_status;
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void joystick_flush(void);
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void register_joystick_button(uint8_t button);
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void unregister_joystick_button(uint8_t button);
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