135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/* 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/>.
|
|
*/
|
|
|
|
#include "joystick.h"
|
|
|
|
#include "analog.h"
|
|
#include "wait.h"
|
|
|
|
joystick_t joystick_state = {
|
|
.buttons = {0},
|
|
.axes =
|
|
{
|
|
#if JOYSTICK_AXIS_COUNT > 0
|
|
0
|
|
#endif
|
|
},
|
|
.dirty = false,
|
|
};
|
|
|
|
// array defining the reading of analog values for each axis
|
|
__attribute__((weak)) joystick_config_t joystick_axes[JOYSTICK_AXIS_COUNT] = {};
|
|
|
|
__attribute__((weak)) void joystick_task(void) {
|
|
joystick_read_axes();
|
|
}
|
|
|
|
void joystick_flush(void) {
|
|
if (joystick_state.dirty) {
|
|
host_joystick_send(&joystick_state);
|
|
joystick_state.dirty = false;
|
|
}
|
|
}
|
|
|
|
void register_joystick_button(uint8_t button) {
|
|
if (button >= JOYSTICK_BUTTON_COUNT) return;
|
|
joystick_state.buttons[button / 8] |= 1 << (button % 8);
|
|
joystick_state.dirty = true;
|
|
joystick_flush();
|
|
}
|
|
|
|
void unregister_joystick_button(uint8_t button) {
|
|
if (button >= JOYSTICK_BUTTON_COUNT) return;
|
|
joystick_state.buttons[button / 8] &= ~(1 << (button % 8));
|
|
joystick_state.dirty = true;
|
|
joystick_flush();
|
|
}
|
|
|
|
int16_t joystick_read_axis(uint8_t axis) {
|
|
if (axis >= JOYSTICK_AXIS_COUNT) return 0;
|
|
|
|
// disable pull-up resistor
|
|
writePinLow(joystick_axes[axis].input_pin);
|
|
|
|
// if pin was a pull-up input, we need to uncharge it by turning it low
|
|
// before making it a low input
|
|
setPinOutput(joystick_axes[axis].input_pin);
|
|
|
|
wait_us(10);
|
|
|
|
if (joystick_axes[axis].output_pin != JS_VIRTUAL_AXIS) {
|
|
setPinOutput(joystick_axes[axis].output_pin);
|
|
writePinHigh(joystick_axes[axis].output_pin);
|
|
}
|
|
|
|
if (joystick_axes[axis].ground_pin != JS_VIRTUAL_AXIS) {
|
|
setPinOutput(joystick_axes[axis].ground_pin);
|
|
writePinLow(joystick_axes[axis].ground_pin);
|
|
}
|
|
|
|
wait_us(10);
|
|
|
|
setPinInput(joystick_axes[axis].input_pin);
|
|
|
|
wait_us(10);
|
|
|
|
#if defined(ANALOG_JOYSTICK_ENABLE) && (defined(__AVR__) || defined(PROTOCOL_CHIBIOS))
|
|
int16_t axis_val = analogReadPin(joystick_axes[axis].input_pin);
|
|
#else
|
|
// default to resting position
|
|
int16_t axis_val = joystick_axes[axis].mid_digit;
|
|
#endif
|
|
|
|
// test the converted value against the lower range
|
|
int32_t ref = joystick_axes[axis].mid_digit;
|
|
int32_t range = joystick_axes[axis].min_digit;
|
|
int32_t ranged_val = ((axis_val - ref) * -JOYSTICK_MAX_VALUE) / (range - ref);
|
|
|
|
if (ranged_val > 0) {
|
|
// the value is in the higher range
|
|
range = joystick_axes[axis].max_digit;
|
|
ranged_val = ((axis_val - ref) * JOYSTICK_MAX_VALUE) / (range - ref);
|
|
}
|
|
|
|
// clamp the result in the valid range
|
|
ranged_val = ranged_val < -JOYSTICK_MAX_VALUE ? -JOYSTICK_MAX_VALUE : ranged_val;
|
|
ranged_val = ranged_val > JOYSTICK_MAX_VALUE ? JOYSTICK_MAX_VALUE : ranged_val;
|
|
|
|
return ranged_val;
|
|
}
|
|
|
|
void joystick_read_axes(void) {
|
|
#if JOYSTICK_AXIS_COUNT > 0
|
|
for (int i = 0; i < JOYSTICK_AXIS_COUNT; ++i) {
|
|
if (joystick_axes[i].input_pin == JS_VIRTUAL_AXIS) {
|
|
continue;
|
|
}
|
|
|
|
joystick_set_axis(i, joystick_read_axis(i));
|
|
}
|
|
|
|
joystick_flush();
|
|
#endif
|
|
}
|
|
|
|
void joystick_set_axis(uint8_t axis, int16_t value) {
|
|
if (axis >= JOYSTICK_AXIS_COUNT) return;
|
|
|
|
if (value != joystick_state.axes[axis]) {
|
|
joystick_state.axes[axis] = value;
|
|
joystick_state.dirty = true;
|
|
}
|
|
}
|