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105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/* Touch Pad Interrupt Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#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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static const char* TAG = "Touch pad";
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static bool touch_pad_activated[TOUCH_PAD_MAX];
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/*
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Read values sensed at all available touch pads.
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Use half of read value as the threshold
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to trigger interrupt when the pad is touched.
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Note: this routine demonstrates a simple way
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to configure activation threshold for the touch pads.
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Do not touch any pads when this routine
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is running (on application start).
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*/
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static void touch_pad_set_thresholds(void)
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{
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uint16_t touch_value;
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for (int i=0; i<TOUCH_PAD_MAX; i++) {
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ESP_ERROR_CHECK(touch_pad_read(i, &touch_value));
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ESP_ERROR_CHECK(touch_pad_config(i, touch_value/2));
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}
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}
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/*
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Check if any of touch pads has been activated
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by reading a table updated by rtc_intr()
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If so, then print it out on a serial monitor.
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Clear related entry in the table afterwards
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*/
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static void touch_pad_read_task(void *pvParameter)
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{
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static int show_message;
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while (1) {
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for (int i=0; i<TOUCH_PAD_MAX; i++) {
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if (touch_pad_activated[i] == true) {
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ESP_LOGI(TAG, "T%d activated!", i);
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// Wait a while for the pad being released
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vTaskDelay(200 / portTICK_PERIOD_MS);
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// Clear information on pad activation
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touch_pad_activated[i] = false;
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// Reset the counter triggering a message
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// that application is running
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show_message = 1;
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}
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}
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// If no pad is touched, every couple of seconds, show a message
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// that application is running
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if (show_message++ % 500 == 0) {
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ESP_LOGI(TAG, "Waiting for any pad being touched...");
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}
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vTaskDelay(10 / portTICK_PERIOD_MS);
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}
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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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*/
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static void touch_pad_rtc_intr(void * arg)
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{
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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_MAX; i++) {
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if ((pad_intr >> i) & 0x01) {
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touch_pad_activated[i] = true;
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}
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}
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}
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}
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void app_main()
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{
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// Initialize touch pad peripheral
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ESP_LOGI(TAG, "Initializing touch pad");
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touch_pad_init();
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touch_pad_set_thresholds();
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touch_pad_isr_handler_register(touch_pad_rtc_intr, NULL, 0, NULL);
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// Start a task to show what pads have been touched
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xTaskCreate(&touch_pad_read_task, "touch_pad_read_task", 2048, NULL, 5, NULL);
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}
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