This is the code:
Code: Select all
/* Touch Pad Interrupt Example
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "esp_log.h"
#include "driver/touch_pad.h"
#include "soc/rtc_periph.h"
#include "soc/sens_periph.h"
static const char *TAG = "Touch pad";
#define TOUCH_THRESH_NO_USE (0)
#define TOUCH_THRESH_PERCENT (80)
#define TOUCHPAD_FILTER_TOUCH_PERIOD (10)
static bool s_pad_activated[TOUCH_PAD_MAX];
static uint32_t s_pad_init_val[TOUCH_PAD_MAX];
static xQueueHandle touchQueueStatic;
/*
Read values sensed at all available touch pads.
Use 2 / 3 of read value as the threshold
to trigger interrupt when the pad is touched.
Note: this routine demonstrates a simple way
to configure activation threshold for the touch pads.
Do not touch any pads when this routine
is running (on application start).
*/
static void tp_example_set_thresholds(void)
{
uint16_t touch_value;
for (int i = 0; i < TOUCH_PAD_MAX; i++)
{
//read filtered value
touch_pad_read_filtered(i, &touch_value);
s_pad_init_val[i] = touch_value;
ESP_LOGI(TAG, "test init: touch pad [%d] val is %d", i, touch_value);
//set interrupt threshold.
ESP_ERROR_CHECK(touch_pad_set_thresh(i, touch_value * 2 / 3));
}
}
/*
Check if any of touch pads has been activated
by reading a table updated by rtc_intr()
If so, then print it out on a serial monitor.
Clear related entry in the table afterwards
In interrupt mode, the table is updated in touch ISR.
In filter mode, we will compare the current filtered value with the initial one.
If the current filtered value is less than 80% of the initial value, we can
regard it as a 'touched' event.
When calling touch_pad_init, a timer will be started to run the filter.
This mode is designed for the situation that the pad is covered
by a 2-or-3-mm-thick medium, usually glass or plastic.
The difference caused by a 'touch' action could be very small, but we can still use
filter mode to detect a 'touch' event.
*/
static void tp_example_read_task(void *pvParameter)
{
static int show_message;
int change_mode = 0;
int filter_mode = 0;
while (1)
{
if (filter_mode == 0)
{
//interrupt mode, enable touch interrupt
touch_pad_intr_enable();
for (int i = 0; i < TOUCH_PAD_MAX; i++)
{
if (s_pad_activated[i] == true)
{
ESP_LOGI(TAG, "T%d activated!", i);
// Wait a while for the pad being released
vTaskDelay(200 / portTICK_PERIOD_MS);
// Clear information on pad activation
s_pad_activated[i] = false;
// Reset the counter triggering a message
// that application is running
show_message = 1;
}
}
}
else
{
//filter mode, disable touch interrupt
touch_pad_intr_disable();
touch_pad_clear_status();
for (int i = 0; i < TOUCH_PAD_MAX; i++)
{
uint16_t value = 0;
touch_pad_read_filtered(i, &value);
if (value < s_pad_init_val[i] * TOUCH_THRESH_PERCENT / 100)
{
ESP_LOGI(TAG, "T%d activated!", i);
ESP_LOGI(TAG, "value: %d; init val: %d", value, s_pad_init_val[i]);
vTaskDelay(200 / portTICK_PERIOD_MS);
// Reset the counter to stop changing mode.
change_mode = 1;
show_message = 1;
}
}
}
vTaskDelay(10 / portTICK_PERIOD_MS);
// If no pad is touched, every couple of seconds, show a message
// that application is running
if (show_message++ % 500 == 0)
{
ESP_LOGI(TAG, "Waiting for any pad being touched...");
}
// Change mode if no pad is touched for a long time.
// We can compare the two different mode.
if (change_mode++ % 2000 == 0)
{
filter_mode = !filter_mode;
ESP_LOGW(TAG, "Change mode...%s", filter_mode == 0 ? "interrupt mode" : "filter mode");
}
}
}
/*
Handle an interrupt triggered when a pad is touched.
Recognize what pad has been touched and save it in a table.
*/
static void tp_example_rtc_intr(void *arg)
{
BaseType_t xHigherPriorityTaskWoken;
/* We have not woken a task at the start of the ISR. */
xHigherPriorityTaskWoken = pdFALSE;
uint32_t pad_intr = touch_pad_get_status();
//clear interrupt
touch_pad_clear_status();
for (int i = 0; i < TOUCH_PAD_MAX; i++)
{
if ((pad_intr >> i) & 0x01)
{
xQueueSendFromISR(touchQueueStatic, (void *)i, NULL);
s_pad_activated[i] = true;
}
}
}
/*
* Before reading touch pad, we need to initialize the RTC IO.
*/
static void tp_example_touch_pad_init(void)
{
for (int i = 0; i < TOUCH_PAD_MAX; i++)
{
//init RTC IO and mode for touch pad.
touch_pad_config(i, TOUCH_THRESH_NO_USE);
}
}
void app_main(void)
{
// Initialize touch pad peripheral, it will start a timer to run a filter
ESP_LOGI(TAG, "Initializing touch pad");
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
tp_example_touch_pad_init();
// 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();
// Register touch interrupt ISR
touch_pad_isr_register(tp_example_rtc_intr, NULL);
// Start a task to show what pads have been touched
xTaskCreate(&tp_example_read_task, "touch_pad_read_task", 2048, NULL, 5, NULL);
touchQueueStatic = xQueueCreate(10, sizeof(int));
}
Code: Select all
W (42569) Touch pad: Change mode...filter mode
I (47569) Touch pad: Waiting for any pad being touched...
I (52569) Touch pad: Waiting for any pad being touched...
I (57569) Touch pad: Waiting for any pad being touched...
I (62569) Touch pad: Waiting for any pad being touched...
W (62569) Touch pad: Change mode...interrupt mode
I (67569) Touch pad: Waiting for any pad being touched...
I (72569) Touch pad: Waiting for any pad being touched...
I (77569) Touch pad: Waiting for any pad being touched...
Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x4000c310 PS : 0x00060033 A0 : 0x80087730 A1 : 0x3ffb05f0
A2 : 0x3ffb66b0 A3 : 0x00000008 A4 : 0x00000004 A5 : 0x3ffb66b0
A6 : 0x00000001 A7 : 0x00000000 A8 : 0x00000000 A9 : 0x3ffb5980
A10 : 0x3ffb64c0 A11 : 0x40087340 A12 : 0x3ffb4fb0 A13 : 0x3ffb4f90
0x40087340: _frxt_int_enter at C:/Users/tinus/esp/esp-idf/components/freertos/xtensa/portasm.S:119
A14 : 0x00000000 A15 : 0x00000000 SAR : 0x00000000 EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000008 LBEG : 0x4000c2e0 LEND : 0x4000c2f6 LCOUNT : 0xffffffff
Core 0 was running in ISR context:
EPC1 : 0x4000c310 EPC2 : 0x00000000 EPC3 : 0x00000000 EPC4 : 0x00000000
ELF file SHA256: 1d7ebc082521113e2f20cde608f0d831ff883d04d41874a1bbda2d52c6fc6740
Backtrace: 0x4000c30d:0x3ffb05f0 0x4008772d:0x3ffb0600 0x40087c71:0x3ffb0620 0x400d3a51:0x3ffb0640 0x400d4a9a:0x3ffb0660 0x40082139:0x3ffb0680 0x400e3bf7:0x3ffb4f50 0x400d1c43:0x3ffb4f70 0x4008832a:0x3ffb4f90 0x400870bd:0x3ffb4fb0
0x4008772d: prvCopyDataToQueue at C:/Users/tinus/esp/esp-idf/components/freertos/queue.c:1893
0x40087c71: xQueueGenericSendFromISR at C:/Users/tinus/esp/esp-idf/components/freertos/queue.c:1199
0x400d3a51: tp_example_rtc_intr at C:\Users\tinus\Documents\Projects_no_backup\touch_pad_interrupt\build/../main/esp32/tp_interrupt_main.c:152
0x400d4a9a: rtc_isr at C:/Users/tinus/esp/esp-idf/components/driver/rtc_module.c:71
0x40082139: _xt_lowint1 at C:/Users/tinus/esp/esp-idf/components/freertos/xtensa/xtensa_vectors.S:1164
0x400e3bf7: esp_pm_impl_waiti at C:/Users/tinus/esp/esp-idf/components/esp32/pm_esp32.c:484
0x400d1c43: esp_vApplicationIdleHook at C:/Users/tinus/esp/esp-idf/components/esp_common/src/freertos_hooks.c:63
0x4008832a: prvIdleTask at C:/Users/tinus/esp/esp-idf/components/freertos/tasks.c:3385 (discriminator 1)
0x400870bd: vPortTaskWrapper at C:/Users/tinus/esp/esp-idf/components/freertos/xtensa/port.c:143
Rebooting...
ets Jun 8 2016 00:22:57
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:4
load:0x3fff0034,len:7188
load:0x40078000,len:14352
load:0x40080400,len:4448
0x40080400: _init at ??:?
entry 0x400806f0
I (29) boot: ESP-IDF v4.2-dev-318-g605da33c3-dirty 2nd stage bootloader
I (29) boot: compile time 17:01:16
I (30) boot: chip revision: 1
I (34) boot_comm: chip revision: 1, min. bootloader chip revision: 0Thanks in advance!