Freenove ESP32 User Manual

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118
Chapter 11 Touch
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touch_pad_intr_enable();
xTaskCreateUniversal(task_Touch, "task_Touch", 4096, NULL, 1, NULL, 1);
}
Touch sensor thread callback function.
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void task_Touch(void *pvParameters) {
Serial.printf("task_Touch is running...\r\n");
while (1) {
task_TouchPad(NULL);
}
}
Touch function threshold setting function. When the sensor is touched, the internal capacitor discharges,
and the data change can be detected at the touch pin. Here, 4/5 of the value of the touch sensor without
contact is set as the threshold trigger range.
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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);
}
Touch sensor interrupt trigger function. Execute this function every time the touch sensor is triggered, to set
touchPadVal to true.
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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();
}

Freenove ESP32 Specifications

General

Brand	Freenove
Model	ESP32
Category	Computer Hardware
Language	English