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86 lines
2.3 KiB
86 lines
2.3 KiB
#include <stdio.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_log.h"
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#include "driver/touch_pad.h"
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#include "soc/rtc_cntl_reg.h"
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#include "soc/sens_reg.h"
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#include "Arduino.h"
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#include "keyboard.h"
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using namespace std;
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void (*Keyboard::callbacks[TOUCH_PAD_NUM])();
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Keyboard::Keyboard() {
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}
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/*
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Handle an interrupt triggered when a pad is touched.
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Recognize what pad has been touched and save it in a table.
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https://github.com/espressif/esp-idf/blob/master/examples/peripherals/touch_pad_interrupt/main/tp_interrupt_main.c
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*/
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static void tp_example_rtc_intr(void *arg) {
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uint32_t pad_intr = READ_PERI_REG(SENS_SAR_TOUCH_CTRL2_REG) & 0x3ff;
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uint32_t rtc_intr = READ_PERI_REG(RTC_CNTL_INT_ST_REG);
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//clear interrupt
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WRITE_PERI_REG(RTC_CNTL_INT_CLR_REG, rtc_intr);
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SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_EN_CLR);
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if (rtc_intr & RTC_CNTL_TOUCH_INT_ST) {
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for (int i = 0; i < TOUCH_PAD_NUM; i++) {
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if ((pad_intr >> i) & 0x01) {
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s_pad_activated[i] = true;
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//if (Keyboard::callbacks[i]) Keyboard::callbacks[i]();
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}
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}
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}
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}
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bool Keyboard::getTouchDetected(uint8_t pad) {
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if (pad==8) pad=9; // fix hardware wiring
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if (pad==1) pad=8;
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bool res = s_pad_activated[pad];
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s_pad_activated[pad] = false;
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return res;
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}
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void Keyboard::setCallback(uint8_t key_id, void(*new_function)()) {
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Keyboard::callbacks[key_id] = new_function;
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}
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void Keyboard::init() {
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touch_pad_init();
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Serial.println("touchpad values:");
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for (int i=0; i<TOUCH_PAD_NUM; i++) {
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uint16_t touch_value;
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touch_pad_read((touch_pad_t)i, &touch_value);
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Serial.println(touch_value, DEC);
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}
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// set thresholds // ToDo: what if someone touches something on startup?
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uint16_t touch_value;
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for (int i=0; i<TOUCH_PAD_NUM; i++) {
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touch_pad_read((touch_pad_t)i, &touch_value);
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touch_pad_config((touch_pad_t)i, touch_value/2);
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}
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/*
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threshold[0] = 50;
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threshold[1] = 0;
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threshold[2] = 0;
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threshold[3] = 50;
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threshold[4] = 50;
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threshold[5] = 50;
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threshold[6] = 50;
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threshold[7] = 50;
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threshold[8] = 50;
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threshold[9] = 50;
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for (int i=0; i<TOUCH_PAD_NUM; i++) touch_pad_config((touch_pad_t)i, threshold[i]);
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*/
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// interrupt handler
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touch_pad_isr_handler_register(tp_example_rtc_intr, NULL, 0, NULL);
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}
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