/*
 * btn.c: handler for user interface with real or capacitive buttons
 */

#include "ch32x035_conf.h"
#include "btn.h"

#include "driver/adc.h"



BtnSub btn[BTN_COUNT];

uint16_t btn_pushed;
uint16_t btn_held;



void btn_push_cb(uint8_t idx)
{
    if (!(btn_pushed & (1 << idx))) {
        btn_pushed |= (1 << idx);
        if (btn[idx].cb_push) btn[idx].cb_push(idx);
    }
}

void btn_hold_cb(uint8_t idx)
{
    btn_held |= (1 << idx);
    if (btn[idx].cb_hold) btn[idx].cb_hold(idx);
}

void btn_release_cb(uint8_t idx)
{
    btn_pushed &= ~(1 << idx);
    btn_held   &= ~(1 << idx);
    if (btn[idx].cb_release) btn[idx].cb_release(idx);
}

void btn_process()
{
    uint16_t i;
	uint32_t x;
    uint16_t btn_state[4] = {0};

    // fill button bitfield
    for (i = 0; i < BTN_COUNT; i++) {
        if (i == 0) {
			// GPIOC pulldown button
			x = GPIOC->INDR & (1 << 10);			// PC10 (or PC17)
        } else if (i < 3) {
			// GPIOB pullup buttons
			x = !(GPIOB->INDR & (1 << (i + 10)));	// PB11, PB12
		} else {
            // touch sensors
            x = adc_get_tkey(i - 3);
        }

        // is pushed?
        if (x) {
            if (btn[i].hold != 0xffff)
                btn[i].hold++;
            
            if (btn[i].hold == DEBOUNCE) {
                btn_state[1] |= (1 << i);
            }
        }
        
        // is held?
        if (btn[i].hold == HOLD_COUNTS) {
            btn_state[2] |= (1 << i);
        }

        // is repeated?
        if (btn[i].repeat && (btn[i].hold == (HOLD_COUNTS + btn[i].repeat))) {
            btn_state[2] |= (1 << i);
            btn[i].hold = HOLD_COUNTS;
        }

        // is released?
        if (!x) {
            if (btn[i].hold) {
                btn[i].hold = 0;
                btn_state[3] |= (1 << i);
            }
        }
    }

    // process callbacks for new events
    for (i = 0; i < BTN_COUNT; i++) {
        if (btn_state[1] & (1 << i)) {
            btn_push_cb(i);
        }
        if (btn_state[2] & (1 << i)) {
            btn_hold_cb(i);
        }
        if (btn_state[3] & (1 << i)) {
            btn_release_cb(i);
        }
    }
}