Freenove ESP32 User Manual

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115
Chapter 11 Touch
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TouchPad.cpp
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#include "TouchPad.h"
static uint32_t s_pad_init_val;
static void tp_example_set_thresholds(void) {
uint16_t touch_value;
// read filtered value
touch_pad_read_filtered(PIN_TOUCH_PAD, &touch_value);
s_pad_init_val = touch_value;
// set interrupt threshold.
touch_pad_set_thresh(PIN_TOUCH_PAD, touch_value * 4 / 5);
}
bool touchPadVal = false;
void isr_touchpad(void *arg) {
// uint16_t touchVal = 0;
uint32_t touchStatus = 0;
touchStatus = touch_pad_get_status(); // TOUCHPAD3 : 0000 1000 = 0x08
if (touchStatus == 0x08) // TOUCHPAD3
{
touchPadVal = true;
}
touch_pad_clear_status();
}
void setupTouchPad(void) {
// Initialize touch pad peripheral, it will start a timer to run a filter
ESP_ERROR_CHECK(touch_pad_init());
// If use interrupt trigger mode, should set touch sensor FSM mode at 'TOUCH_FSM_MODE_TIMER'.
touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
// Set reference voltage for charging/discharging
// For most usage scenarios, we recommend using the following combination:
// the high reference valtage will be 2.7V - 1V = 1.7V, The low reference voltage will be 0.5V.
touch_pad_set_voltage(TOUCH_HVOLT_2V7, TOUCH_LVOLT_0V5, TOUCH_HVOLT_ATTEN_1V);
// Init touch pad IO
touch_pad_config(PIN_TOUCH_PAD, TOUCH_THRESH_NO_USE);
// Initialize and start a software filter to detect slight change of capacitance.
touch_pad_filter_start(TOUCHPAD_FILTER_TOUCH_PERIOD);
// Set thresh hold
tp_example_set_thresholds();
// set isr trigger mode
touch_pad_set_trigger_mode(TOUCH_TRIGGER_BELOW);
// Register touch interrupt ISR
touch_pad_isr_register(isr_touchpad, NULL);
// enable isr

Freenove ESP32 Specifications

General

Brand	Freenove
Model	ESP32
Category	Computer Hardware
Language	English