166 lines
6.4 KiB
C
166 lines
6.4 KiB
C
#include "joystick.h"
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#include "process_joystick.h"
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#include "analog.h"
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#include <string.h>
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#include <math.h>
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bool process_joystick_buttons(uint16_t keycode, keyrecord_t *record);
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bool process_joystick(uint16_t keycode, keyrecord_t *record) {
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if (process_joystick_buttons(keycode, record) && (joystick_status.status & JS_UPDATED) > 0) {
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send_joystick_packet(&joystick_status);
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joystick_status.status &= ~JS_UPDATED;
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}
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return true;
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}
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__attribute__((weak)) void joystick_task(void) {
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if (process_joystick_analogread() && (joystick_status.status & JS_UPDATED)) {
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send_joystick_packet(&joystick_status);
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joystick_status.status &= ~JS_UPDATED;
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}
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}
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bool process_joystick_buttons(uint16_t keycode, keyrecord_t *record) {
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if (keycode < JS_BUTTON0 || keycode > JS_BUTTON_MAX) {
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return true;
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} else {
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uint8_t button_idx = (keycode - JS_BUTTON0);
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if (record->event.pressed) {
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joystick_status.buttons[button_idx / 8] |= 1 << (button_idx % 8);
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} else {
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joystick_status.buttons[button_idx / 8] &= ~(1 << (button_idx % 8));
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}
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joystick_status.status |= JS_UPDATED;
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}
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return true;
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}
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uint16_t savePinState(pin_t pin) {
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#ifdef __AVR__
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uint8_t pinNumber = pin & 0xF;
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return ((PORTx_ADDRESS(pin) >> pinNumber) & 0x1) << 1 | ((DDRx_ADDRESS(pin) >> pinNumber) & 0x1);
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#elif defined(PROTOCOL_CHIBIOS)
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/*
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The pin configuration is backed up in the following format :
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bit 15 9 8 7 6 5 4 3 2 1 0
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|unused|ODR|IDR|PUPDR|OSPEEDR|OTYPER|MODER|
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*/
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return ((PAL_PORT(pin)->MODER >> (2 * PAL_PAD(pin))) & 0x3) | (((PAL_PORT(pin)->OTYPER >> (1 * PAL_PAD(pin))) & 0x1) << 2) | (((PAL_PORT(pin)->OSPEEDR >> (2 * PAL_PAD(pin))) & 0x3) << 3) | (((PAL_PORT(pin)->PUPDR >> (2 * PAL_PAD(pin))) & 0x3) << 5) | (((PAL_PORT(pin)->IDR >> (1 * PAL_PAD(pin))) & 0x1) << 7) | (((PAL_PORT(pin)->ODR >> (1 * PAL_PAD(pin))) & 0x1) << 8);
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#else
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return 0;
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#endif
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}
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void restorePinState(pin_t pin, uint16_t restoreState) {
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#if defined(PROTOCOL_LUFA)
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uint8_t pinNumber = pin & 0xF;
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PORTx_ADDRESS(pin) = (PORTx_ADDRESS(pin) & ~_BV(pinNumber)) | (((restoreState >> 1) & 0x1) << pinNumber);
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DDRx_ADDRESS(pin) = (DDRx_ADDRESS(pin) & ~_BV(pinNumber)) | ((restoreState & 0x1) << pinNumber);
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#elif defined(PROTOCOL_CHIBIOS)
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PAL_PORT(pin)->MODER = (PAL_PORT(pin)->MODER & ~(0x3 << (2 * PAL_PAD(pin)))) | (restoreState & 0x3) << (2 * PAL_PAD(pin));
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PAL_PORT(pin)->OTYPER = (PAL_PORT(pin)->OTYPER & ~(0x1 << (1 * PAL_PAD(pin)))) | ((restoreState >> 2) & 0x1) << (1 * PAL_PAD(pin));
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PAL_PORT(pin)->OSPEEDR = (PAL_PORT(pin)->OSPEEDR & ~(0x3 << (2 * PAL_PAD(pin)))) | ((restoreState >> 3) & 0x3) << (2 * PAL_PAD(pin));
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PAL_PORT(pin)->PUPDR = (PAL_PORT(pin)->PUPDR & ~(0x3 << (2 * PAL_PAD(pin)))) | ((restoreState >> 5) & 0x3) << (2 * PAL_PAD(pin));
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PAL_PORT(pin)->IDR = (PAL_PORT(pin)->IDR & ~(0x1 << (1 * PAL_PAD(pin)))) | ((restoreState >> 7) & 0x1) << (1 * PAL_PAD(pin));
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PAL_PORT(pin)->ODR = (PAL_PORT(pin)->ODR & ~(0x1 << (1 * PAL_PAD(pin)))) | ((restoreState >> 8) & 0x1) << (1 * PAL_PAD(pin));
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#else
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return;
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#endif
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}
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__attribute__((weak)) bool process_joystick_analogread() {
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return process_joystick_analogread_quantum();
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}
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bool process_joystick_analogread_quantum() {
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#if JOYSTICK_AXES_COUNT > 0
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for (int axis_index = 0; axis_index < JOYSTICK_AXES_COUNT; ++axis_index) {
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if (joystick_axes[axis_index].input_pin == JS_VIRTUAL_AXIS) {
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continue;
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}
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// save previous input pin status as well
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uint16_t inputSavedState = savePinState(joystick_axes[axis_index].input_pin);
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// disable pull-up resistor
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writePinLow(joystick_axes[axis_index].input_pin);
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// if pin was a pull-up input, we need to uncharge it by turning it low
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// before making it a low input
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setPinOutput(joystick_axes[axis_index].input_pin);
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wait_us(10);
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// save and apply output pin status
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uint16_t outputSavedState = 0;
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if (joystick_axes[axis_index].output_pin != JS_VIRTUAL_AXIS) {
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// save previous output pin status
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outputSavedState = savePinState(joystick_axes[axis_index].output_pin);
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setPinOutput(joystick_axes[axis_index].output_pin);
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writePinHigh(joystick_axes[axis_index].output_pin);
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}
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uint16_t groundSavedState = 0;
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if (joystick_axes[axis_index].ground_pin != JS_VIRTUAL_AXIS) {
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// save previous output pin status
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groundSavedState = savePinState(joystick_axes[axis_index].ground_pin);
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setPinOutput(joystick_axes[axis_index].ground_pin);
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writePinLow(joystick_axes[axis_index].ground_pin);
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}
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wait_us(10);
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setPinInput(joystick_axes[axis_index].input_pin);
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wait_us(10);
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# if defined(__AVR__) || defined(PROTOCOL_CHIBIOS)
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int16_t axis_val = analogReadPin(joystick_axes[axis_index].input_pin);
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# else
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// default to resting position
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int16_t axis_val = joystick_axes[axis_index].mid_digit;
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# endif
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// test the converted value against the lower range
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int32_t ref = joystick_axes[axis_index].mid_digit;
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int32_t range = joystick_axes[axis_index].min_digit;
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int32_t ranged_val = ((axis_val - ref) * -JOYSTICK_RESOLUTION) / (range - ref);
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if (ranged_val > 0) {
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// the value is in the higher range
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range = joystick_axes[axis_index].max_digit;
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ranged_val = ((axis_val - ref) * JOYSTICK_RESOLUTION) / (range - ref);
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}
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// clamp the result in the valid range
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ranged_val = ranged_val < -JOYSTICK_RESOLUTION ? -JOYSTICK_RESOLUTION : ranged_val;
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ranged_val = ranged_val > JOYSTICK_RESOLUTION ? JOYSTICK_RESOLUTION : ranged_val;
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if (ranged_val != joystick_status.axes[axis_index]) {
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joystick_status.axes[axis_index] = ranged_val;
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joystick_status.status |= JS_UPDATED;
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}
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// restore output, ground and input status
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if (joystick_axes[axis_index].output_pin != JS_VIRTUAL_AXIS) {
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restorePinState(joystick_axes[axis_index].output_pin, outputSavedState);
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}
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if (joystick_axes[axis_index].ground_pin != JS_VIRTUAL_AXIS) {
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restorePinState(joystick_axes[axis_index].ground_pin, groundSavedState);
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}
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restorePinState(joystick_axes[axis_index].input_pin, inputSavedState);
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}
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#endif
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return true;
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}
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