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esp-idf/components/driver/esp32/touch_sensor.c
chaijie a48b5246cc ESP32: Fix xtal 32k not oscillate or oscillate too slowly issue 
ESP32 in revision0 and revision1 uses touchpad to provide
current to oscillate xtal 32k. But revision2 and revision3
do not need to do that.
Note: touchpad can not work and toupad/ULP wakeup sources
are not available when toupad provides current to xtal 32k
2020-11-23 19:38:11 +08:00

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// Copyright 2016-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdlib.h>
#include <ctype.h>
#include "sdkconfig.h"
#include "esp_types.h"
#include "esp_log.h"
#include "sys/lock.h"
#include "soc/rtc.h"
#include "soc/periph_defs.h"
#include "freertos/FreeRTOS.h"
#include "freertos/xtensa_api.h"
#include "freertos/semphr.h"
#include "freertos/timers.h"
#include "esp_intr_alloc.h"
#include "driver/rtc_io.h"
#include "driver/touch_pad.h"
#include "driver/rtc_cntl.h"
#include "driver/gpio.h"
#ifndef NDEBUG
// Enable built-in checks in queue.h in debug builds
#define INVARIANTS
#endif
#include "sys/queue.h"
#include "hal/touch_sensor_types.h"
#include "hal/touch_sensor_hal.h"
typedef struct {
TimerHandle_t timer;
uint16_t filtered_val[TOUCH_PAD_MAX];
uint16_t raw_val[TOUCH_PAD_MAX];
uint32_t filter_period;
uint32_t period;
bool enable;
} touch_pad_filter_t;
static touch_pad_filter_t *s_touch_pad_filter = NULL;
// check if touch pad be initialized.
static uint16_t s_touch_pad_init_bit = 0x0000;
static filter_cb_t s_filter_cb = NULL;
static SemaphoreHandle_t rtc_touch_mux = NULL;
#define TOUCH_PAD_FILTER_FACTOR_DEFAULT (4) // IIR filter coefficient.
#define TOUCH_PAD_SHIFT_DEFAULT (4) // Increase computing accuracy.
#define TOUCH_PAD_SHIFT_ROUND_DEFAULT (8) // ROUND = 2^(n-1); rounding off for fractional.
static const char *TOUCH_TAG = "TOUCH_SENSOR";
#define TOUCH_CHECK(a, str, ret_val) ({ \
if (!(a)) { \
ESP_LOGE(TOUCH_TAG,"%s(%d): %s", __FUNCTION__, __LINE__, str); \
return (ret_val); \
} \
})
#define TOUCH_CHANNEL_CHECK(channel) TOUCH_CHECK(channel < SOC_TOUCH_SENSOR_NUM, "Touch channel error", ESP_ERR_INVALID_ARG)
#define TOUCH_PARAM_CHECK_STR(s) ""s" parameter error"
extern portMUX_TYPE rtc_spinlock; //TODO: Will be placed in the appropriate position after the rtc module is finished.
#define TOUCH_ENTER_CRITICAL() portENTER_CRITICAL(&rtc_spinlock)
#define TOUCH_EXIT_CRITICAL() portEXIT_CRITICAL(&rtc_spinlock)
/*---------------------------------------------------------------
Touch Pad
---------------------------------------------------------------*/
//Some register bits of touch sensor 8 and 9 are mismatched, we need to swap the bits.
#define BITSWAP(data, n, m) (((data >> n) & 0x1) == ((data >> m) & 0x1) ? (data) : ((data) ^ ((0x1 <<n) | (0x1 << m))))
#define TOUCH_BITS_SWAP(v) BITSWAP(v, TOUCH_PAD_NUM8, TOUCH_PAD_NUM9)
static esp_err_t _touch_pad_read(touch_pad_t touch_num, uint16_t *touch_value, touch_fsm_mode_t mode);
esp_err_t touch_pad_isr_handler_register(void (*fn)(void *), void *arg, int no_use, intr_handle_t *handle_no_use)
{
TOUCH_CHECK(fn, "Touch_Pad ISR null", ESP_ERR_INVALID_ARG);
return rtc_isr_register(fn, arg, RTC_CNTL_TOUCH_INT_ST_M);
}
esp_err_t touch_pad_isr_register(intr_handler_t fn, void *arg)
{
TOUCH_CHECK(fn, "Touch_Pad ISR null", ESP_ERR_INVALID_ARG);
return rtc_isr_register(fn, arg, RTC_CNTL_TOUCH_INT_ST_M);
}
static uint32_t _touch_filter_iir(uint32_t in_now, uint32_t out_last, uint32_t k)
{
if (k == 0) {
return in_now;
} else {
uint32_t out_now = (in_now + (k - 1) * out_last) / k;
return out_now;
}
}
esp_err_t touch_pad_set_filter_read_cb(filter_cb_t read_cb)
{
s_filter_cb = read_cb;
return ESP_OK;
}
static void touch_pad_filter_cb(void *arg)
{
static uint32_t s_filtered_temp[TOUCH_PAD_MAX] = {0};
if (s_touch_pad_filter == NULL || rtc_touch_mux == NULL) {
return;
}
uint16_t val = 0;
touch_fsm_mode_t mode;
xSemaphoreTake(rtc_touch_mux, portMAX_DELAY);
touch_pad_get_fsm_mode(&mode);
for (int i = 0; i < TOUCH_PAD_MAX; i++) {
if ((s_touch_pad_init_bit >> i) & 0x1) {
_touch_pad_read(i, &val, mode);
s_touch_pad_filter->raw_val[i] = val;
s_filtered_temp[i] = s_filtered_temp[i] == 0 ? ((uint32_t)val << TOUCH_PAD_SHIFT_DEFAULT) : s_filtered_temp[i];
s_filtered_temp[i] = _touch_filter_iir((val << TOUCH_PAD_SHIFT_DEFAULT),
s_filtered_temp[i], TOUCH_PAD_FILTER_FACTOR_DEFAULT);
s_touch_pad_filter->filtered_val[i] = (s_filtered_temp[i] + TOUCH_PAD_SHIFT_ROUND_DEFAULT) >> TOUCH_PAD_SHIFT_DEFAULT;
}
}
xTimerReset(s_touch_pad_filter->timer, portMAX_DELAY);
xSemaphoreGive(rtc_touch_mux);
if (s_filter_cb != NULL) {
//return the raw data and filtered data.
s_filter_cb(s_touch_pad_filter->raw_val, s_touch_pad_filter->filtered_val);
}
}
esp_err_t touch_pad_set_meas_time(uint16_t sleep_cycle, uint16_t meas_cycle)
{
TOUCH_ENTER_CRITICAL();
touch_hal_set_meas_time(meas_cycle);
touch_hal_set_sleep_time(sleep_cycle);
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_get_meas_time(uint16_t *sleep_cycle, uint16_t *meas_cycle)
{
TOUCH_ENTER_CRITICAL();
touch_hal_get_meas_time(meas_cycle);
touch_hal_get_sleep_time(sleep_cycle);
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_set_trigger_mode(touch_trigger_mode_t mode)
{
TOUCH_CHECK((mode < TOUCH_TRIGGER_MAX), TOUCH_PARAM_CHECK_STR("mode"), ESP_ERR_INVALID_ARG);
TOUCH_ENTER_CRITICAL();
touch_hal_set_trigger_mode(mode);
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_get_trigger_mode(touch_trigger_mode_t *mode)
{
touch_hal_get_trigger_mode(mode);
return ESP_OK;
}
esp_err_t touch_pad_set_trigger_source(touch_trigger_src_t src)
{
TOUCH_CHECK((src < TOUCH_TRIGGER_SOURCE_MAX), TOUCH_PARAM_CHECK_STR("src"), ESP_ERR_INVALID_ARG);
TOUCH_ENTER_CRITICAL();
touch_hal_set_trigger_source(src);
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_get_trigger_source(touch_trigger_src_t *src)
{
touch_hal_get_trigger_source(src);
return ESP_OK;
}
esp_err_t touch_pad_set_group_mask(uint16_t set1_mask, uint16_t set2_mask, uint16_t en_mask)
{
TOUCH_CHECK((set1_mask <= TOUCH_PAD_BIT_MASK_ALL), "touch set1 bitmask error", ESP_ERR_INVALID_ARG);
TOUCH_CHECK((set2_mask <= TOUCH_PAD_BIT_MASK_ALL), "touch set2 bitmask error", ESP_ERR_INVALID_ARG);
TOUCH_CHECK((en_mask <= TOUCH_PAD_BIT_MASK_ALL), "touch work_en bitmask error", ESP_ERR_INVALID_ARG);
TOUCH_ENTER_CRITICAL();
touch_hal_set_group_mask(set1_mask, set2_mask);
touch_hal_set_channel_mask(en_mask);
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_get_group_mask(uint16_t *set1_mask, uint16_t *set2_mask, uint16_t *en_mask)
{
TOUCH_ENTER_CRITICAL();
touch_hal_get_channel_mask(en_mask);
touch_hal_get_group_mask(set1_mask, set2_mask);
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_clear_group_mask(uint16_t set1_mask, uint16_t set2_mask, uint16_t en_mask)
{
TOUCH_CHECK((set1_mask <= TOUCH_PAD_BIT_MASK_ALL), "touch set1 bitmask error", ESP_ERR_INVALID_ARG);
TOUCH_CHECK((set2_mask <= TOUCH_PAD_BIT_MASK_ALL), "touch set2 bitmask error", ESP_ERR_INVALID_ARG);
TOUCH_CHECK((en_mask <= TOUCH_PAD_BIT_MASK_ALL), "touch work_en bitmask error", ESP_ERR_INVALID_ARG);
TOUCH_ENTER_CRITICAL();
touch_hal_clear_channel_mask(en_mask);
touch_hal_clear_group_mask(set1_mask, set2_mask);
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_intr_enable(void)
{
TOUCH_ENTER_CRITICAL();
touch_hal_intr_enable();
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_intr_disable(void)
{
TOUCH_ENTER_CRITICAL();
touch_hal_intr_disable();
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_intr_clear(void)
{
TOUCH_ENTER_CRITICAL();
touch_hal_intr_clear();
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
bool touch_pad_meas_is_done(void)
{
return touch_hal_meas_is_done();
}
esp_err_t touch_pad_config(touch_pad_t touch_num, uint16_t threshold)
{
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_FAIL);
TOUCH_CHANNEL_CHECK(touch_num);
touch_fsm_mode_t mode;
touch_pad_io_init(touch_num);
TOUCH_ENTER_CRITICAL();
touch_hal_config(touch_num);
touch_hal_set_threshold(touch_num, threshold);
TOUCH_EXIT_CRITICAL();
touch_pad_get_fsm_mode(&mode);
if (TOUCH_FSM_MODE_SW == mode) {
touch_pad_clear_group_mask((1 << touch_num), (1 << touch_num), (1 << touch_num));
s_touch_pad_init_bit |= (1 << touch_num);
} else if (TOUCH_FSM_MODE_TIMER == mode) {
uint16_t sleep_time = 0;
uint16_t meas_cycle = 0;
uint32_t wait_time_ms = 0;
uint32_t wait_tick = 0;
uint32_t rtc_clk = rtc_clk_slow_freq_get_hz();
touch_pad_set_group_mask((1 << touch_num), (1 << touch_num), (1 << touch_num));
touch_pad_get_meas_time(&sleep_time, &meas_cycle);
//If the FSM mode is 'TOUCH_FSM_MODE_TIMER', The data will be ready after one measurement cycle
//after this function is executed, otherwise, the "touch_value" by "touch_pad_read" is 0.
wait_time_ms = sleep_time / (rtc_clk / 1000) + meas_cycle / (RTC_FAST_CLK_FREQ_APPROX / 1000);
wait_tick = wait_time_ms / portTICK_RATE_MS;
vTaskDelay(wait_tick ? wait_tick : 1);
s_touch_pad_init_bit |= (1 << touch_num);
} else {
return ESP_FAIL;
}
return ESP_OK;
}
esp_err_t touch_pad_init(void)
{
#ifdef CONFIG_ESP32_RTC_EXT_CRYST_ADDIT_CURRENT_V2
ESP_LOGE(TOUCH_TAG, "Touch Pad can't work because it provides current to external XTAL");
return ESP_ERR_NOT_SUPPORTED;
#endif // CONFIG_ESP32_RTC_EXT_CRYST_ADDIT_CURRENT_V2
if (rtc_touch_mux == NULL) {
rtc_touch_mux = xSemaphoreCreateMutex();
}
if (rtc_touch_mux == NULL) {
return ESP_FAIL;
}
TOUCH_ENTER_CRITICAL();
touch_hal_init();
TOUCH_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t touch_pad_deinit(void)
{
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_FAIL);
if (s_touch_pad_filter != NULL) {
touch_pad_filter_stop();
touch_pad_filter_delete();
}
xSemaphoreTake(rtc_touch_mux, portMAX_DELAY);
s_touch_pad_init_bit = 0x0000;
TOUCH_ENTER_CRITICAL();
touch_hal_deinit();
TOUCH_EXIT_CRITICAL();
xSemaphoreGive(rtc_touch_mux);
vSemaphoreDelete(rtc_touch_mux);
rtc_touch_mux = NULL;
return ESP_OK;
}
static esp_err_t _touch_pad_read(touch_pad_t touch_num, uint16_t *touch_value, touch_fsm_mode_t mode)
{
esp_err_t res = ESP_OK;
if (TOUCH_FSM_MODE_SW == mode) {
touch_pad_set_group_mask((1 << touch_num), (1 << touch_num), (1 << touch_num));
touch_pad_sw_start();
while (!touch_hal_meas_is_done()) {};
*touch_value = touch_hal_read_raw_data(touch_num);
touch_pad_clear_group_mask((1 << touch_num), (1 << touch_num), (1 << touch_num));
} else if (TOUCH_FSM_MODE_TIMER == mode) {
while (!touch_hal_meas_is_done()) {};
*touch_value = touch_hal_read_raw_data(touch_num);
} else {
res = ESP_FAIL;
}
if (*touch_value == 0) {
res = ESP_ERR_INVALID_STATE;
}
return res;
}
esp_err_t touch_pad_read(touch_pad_t touch_num, uint16_t *touch_value)
{
TOUCH_CHANNEL_CHECK(touch_num);
TOUCH_CHECK(touch_value != NULL, "touch_value", ESP_ERR_INVALID_ARG);
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_FAIL);
esp_err_t res = ESP_OK;
touch_fsm_mode_t mode;
touch_pad_get_fsm_mode(&mode);
xSemaphoreTake(rtc_touch_mux, portMAX_DELAY);
res = _touch_pad_read(touch_num, touch_value, mode);
xSemaphoreGive(rtc_touch_mux);
return res;
}
IRAM_ATTR esp_err_t touch_pad_read_raw_data(touch_pad_t touch_num, uint16_t *touch_value)
{
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_FAIL);
TOUCH_CHANNEL_CHECK(touch_num);
TOUCH_CHECK(touch_value != NULL, "touch_value", ESP_ERR_INVALID_ARG);
TOUCH_CHECK(s_touch_pad_filter != NULL, "Touch pad filter not initialized", ESP_FAIL);
*touch_value = s_touch_pad_filter->raw_val[touch_num];
if (*touch_value == 0) {
return ESP_ERR_INVALID_STATE;
}
return ESP_OK;
}
IRAM_ATTR esp_err_t touch_pad_read_filtered(touch_pad_t touch_num, uint16_t *touch_value)
{
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_FAIL);
TOUCH_CHANNEL_CHECK(touch_num);
TOUCH_CHECK(touch_value != NULL, "touch_value", ESP_ERR_INVALID_ARG);
TOUCH_CHECK(s_touch_pad_filter != NULL, "Touch pad filter not initialized", ESP_FAIL);
*touch_value = (s_touch_pad_filter->filtered_val[touch_num]);
if (*touch_value == 0) {
return ESP_ERR_INVALID_STATE;
}
return ESP_OK;
}
esp_err_t touch_pad_set_filter_period(uint32_t new_period_ms)
{
TOUCH_CHECK(s_touch_pad_filter != NULL, "Touch pad filter not initialized", ESP_ERR_INVALID_STATE);
TOUCH_CHECK(new_period_ms > 0, "Touch pad filter period error", ESP_ERR_INVALID_ARG);
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_ERR_INVALID_STATE);
esp_err_t ret = ESP_OK;
xSemaphoreTake(rtc_touch_mux, portMAX_DELAY);
if (s_touch_pad_filter != NULL) {
xTimerChangePeriod(s_touch_pad_filter->timer, new_period_ms / portTICK_PERIOD_MS, portMAX_DELAY);
s_touch_pad_filter->period = new_period_ms;
} else {
ESP_LOGE(TOUCH_TAG, "Touch pad filter deleted");
ret = ESP_ERR_INVALID_STATE;
}
xSemaphoreGive(rtc_touch_mux);
return ret;
}
esp_err_t touch_pad_get_filter_period(uint32_t *p_period_ms)
{
TOUCH_CHECK(s_touch_pad_filter != NULL, "Touch pad filter not initialized", ESP_ERR_INVALID_STATE);
TOUCH_CHECK(p_period_ms != NULL, "Touch pad period pointer error", ESP_ERR_INVALID_ARG);
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_ERR_INVALID_STATE);
esp_err_t ret = ESP_OK;
xSemaphoreTake(rtc_touch_mux, portMAX_DELAY);
if (s_touch_pad_filter != NULL) {
*p_period_ms = s_touch_pad_filter->period;
} else {
ESP_LOGE(TOUCH_TAG, "Touch pad filter deleted");
ret = ESP_ERR_INVALID_STATE;
}
xSemaphoreGive(rtc_touch_mux);
return ret;
}
esp_err_t touch_pad_filter_start(uint32_t filter_period_ms)
{
TOUCH_CHECK(filter_period_ms >= portTICK_PERIOD_MS, "Touch pad filter period error", ESP_ERR_INVALID_ARG);
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_ERR_INVALID_STATE);
xSemaphoreTake(rtc_touch_mux, portMAX_DELAY);
if (s_touch_pad_filter == NULL) {
s_touch_pad_filter = (touch_pad_filter_t *) calloc(1, sizeof(touch_pad_filter_t));
if (s_touch_pad_filter == NULL) {
goto err_no_mem;
}
}
if (s_touch_pad_filter->timer == NULL) {
s_touch_pad_filter->timer = xTimerCreate("filter_tmr", filter_period_ms / portTICK_PERIOD_MS, pdFALSE,
NULL, (TimerCallbackFunction_t) touch_pad_filter_cb);
if (s_touch_pad_filter->timer == NULL) {
free(s_touch_pad_filter);
s_touch_pad_filter = NULL;
goto err_no_mem;
}
s_touch_pad_filter->period = filter_period_ms;
}
xSemaphoreGive(rtc_touch_mux);
touch_pad_filter_cb(NULL);
return ESP_OK;
err_no_mem:
xSemaphoreGive(rtc_touch_mux);
return ESP_ERR_NO_MEM;
}
esp_err_t touch_pad_filter_stop(void)
{
TOUCH_CHECK(s_touch_pad_filter != NULL, "Touch pad filter not initialized", ESP_ERR_INVALID_STATE);
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_ERR_INVALID_STATE);
esp_err_t ret = ESP_OK;
xSemaphoreTake(rtc_touch_mux, portMAX_DELAY);
if (s_touch_pad_filter != NULL) {
xTimerStop(s_touch_pad_filter->timer, portMAX_DELAY);
} else {
ESP_LOGE(TOUCH_TAG, "Touch pad filter deleted");
ret = ESP_ERR_INVALID_STATE;
}
xSemaphoreGive(rtc_touch_mux);
return ret;
}
esp_err_t touch_pad_filter_delete(void)
{
TOUCH_CHECK(s_touch_pad_filter != NULL, "Touch pad filter not initialized", ESP_ERR_INVALID_STATE);
TOUCH_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_ERR_INVALID_STATE);
xSemaphoreTake(rtc_touch_mux, portMAX_DELAY);
if (s_touch_pad_filter != NULL) {
if (s_touch_pad_filter->timer != NULL) {
xTimerStop(s_touch_pad_filter->timer, portMAX_DELAY);
xTimerDelete(s_touch_pad_filter->timer, portMAX_DELAY);
s_touch_pad_filter->timer = NULL;
}
free(s_touch_pad_filter);
s_touch_pad_filter = NULL;
}
xSemaphoreGive(rtc_touch_mux);
return ESP_OK;
}
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