88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
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/*
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* Created on: Jul 27, 2024
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*
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* generic button handler like I do on most of my projects
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*/
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#include <ch32v00x.h>
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#include "btn.h"
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struct Btn btn[BTN_COUNT] = {0};
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void btn_init()
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{
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uint8_t i;
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// configure GPIO
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BTN_PORT->BSHR = (BTN1_PUPD << BTN1_PIN) | (BTN2_PUPD << BTN2_PIN);
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BTN_PORT->CFGLR &= ~((0xff << (BTN1_PIN*4)) | ((0xff << (BTN2_PIN*4))));
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BTN_PORT->CFGLR |= (0x80 << (BTN1_PIN*4)) | (0x80 << (BTN2_PIN*4));
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// configure default setup
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for (i = 0; i < BTN_COUNT; i++) {
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btn[i]._mask = 0;
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}
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btn[0]._pintype = BTN1_PIN | 0x10;
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btn[1]._pintype = BTN2_PIN;
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}
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void btn_poll()
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{
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uint8_t i;
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uint8_t r;
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uint8_t ignore;
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for (i = 0; i < BTN_COUNT; i++) {
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ignore = btn[i]._mask & BTN_IGNORE;
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r = BTN_PORT->INDR & (1 << (btn[i]._pintype & 0xf));
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if ((!r && (btn[i]._pintype & 0x10)) || (r && !(btn[i]._pintype & 0x10))) {
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// is pushed
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if (btn[i]._count < BTN_DEBOUNCE) continue;
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// hold counter
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if (btn[i]._count < 0xffff) btn[i]._count++;
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// first push?
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if (!btn[i]._mask & BTN_PUSH) {
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btn[i]._mask = BTN_PUSH;
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if (btn[i].cb_push) {
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btn[i].cb_push(i);
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btn[i]._mask |= (BTN_PUSH << 4);
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}
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} else if (btn[i]._count >= btn[i].hold) {
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// held to count limit
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// if button is not repeatable, do not retrigger
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if ((btn[i]._mask && BTN_HOLD) && !btn[i].repeat) continue;
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btn[i]._mask |= BTN_HOLD;
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// call callback only if not in ignore state
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if (btn[i].cb_hold && !ignore) {
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btn[i].cb_hold(i);
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btn[i]._mask |= (BTN_HOLD << 4);
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}
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// apply repeat rate to count
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btn[i]._count -= btn[i].repeat;
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}
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} else {
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// is not pushed
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if (!btn[i]._mask & BTN_RELEASE) {
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btn[i]._mask = BTN_RELEASE;
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btn[i]._count = 0;
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// call callback only if not in ignore state
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if (btn[i].cb_release && !ignore) {
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btn[i].cb_release(i);
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btn[i]._mask |= (BTN_RELEASE << 4);
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}
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}
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}
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}
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}
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