72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/* Touch Pad Read 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 "driver/touch_pad.h"
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#define TOUCH_PAD_NO_CHANGE (-1)
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#define TOUCH_THRESH_NO_USE (0)
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#define TOUCH_FILTER_MODE_EN (1)
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#define TOUCHPAD_FILTER_TOUCH_PERIOD (10)
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/*
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Read values sensed at all available touch pads.
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Print out values in a loop on a serial monitor.
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*/
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static void tp_example_read_task(void *pvParameter)
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{
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uint16_t touch_value;
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uint16_t touch_filter_value;
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#if TOUCH_FILTER_MODE_EN
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printf("Touch Sensor filter mode read, the output format is: \nTouchpad num:[raw data, filtered data]\n\n");
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#else
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printf("Touch Sensor normal mode read, the output format is: \nTouchpad num:[raw data]\n\n");
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#endif
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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_FILTER_MODE_EN
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// If open the filter mode, please use this API to get the touch pad count.
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touch_pad_read_raw_data(i, &touch_value);
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touch_pad_read_filtered(i, &touch_filter_value);
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printf("T%d:[%4d,%4d] ", i, touch_value, touch_filter_value);
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#else
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touch_pad_read(i, &touch_value);
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printf("T%d:[%4d] ", i, touch_value);
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#endif
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}
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printf("\n");
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vTaskDelay(200 / portTICK_PERIOD_MS);
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}
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}
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static void tp_example_touch_pad_init()
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{
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for (int i = 0;i< TOUCH_PAD_MAX;i++) {
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touch_pad_config(i, TOUCH_THRESH_NO_USE);
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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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// The default fsm mode is software trigger mode.
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touch_pad_init();
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// Set reference voltage for charging/discharging
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// In this case, the high reference valtage will be 2.7V - 1V = 1.7V
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// The low reference voltage will be 0.5
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// The larger the range, the larger the pulse count value.
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touch_pad_set_voltage(TOUCH_HVOLT_2V7, TOUCH_LVOLT_0V5, TOUCH_HVOLT_ATTEN_1V);
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tp_example_touch_pad_init();
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#if TOUCH_FILTER_MODE_EN
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touch_pad_filter_start(TOUCHPAD_FILTER_TOUCH_PERIOD);
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#endif
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// Start task to read values sensed by pads
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xTaskCreate(&tp_example_read_task, "touch_pad_read_task", 2048, NULL, 5, NULL);
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}
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