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driver(touchpad): improve touchpad filter mode and update examples.

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This commit is contained in:
Wangjialin
2018-05-18 15:56:45 +08:00
committed by fuzhibo
parent 993b8b7bf6
commit 09181b7d94
6 changed files with 221 additions and 131 deletions
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33
examples/peripherals/touch_pad_interrupt/main/tp_interrupt_main.c
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@@ -17,12 +17,12 @@
static const char* TAG = "Touch pad";
#define TOUCH_THRESH_NO_USE (0)
#define TOUCH_THRESH_PERCENT (99)
#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];
/*
Read values sensed at all available touch pads.
Use 2 / 3 of read value as the threshold
@@ -42,7 +42,7 @@ static void tp_example_set_thresholds(void)
//read filtered value
touch_pad_read_filtered(i, &touch_value);
s_pad_init_val[i] = touch_value;
ESP_LOGI(TAG, "test init touch val: %d\n", touch_value);
ESP_LOGI(TAG, "test init touch val: %d", touch_value);
//set interrupt threshold.
ESP_ERROR_CHECK(touch_pad_set_thresh(i, touch_value * 2 / 3));
@@ -58,7 +58,7 @@ static void tp_example_set_thresholds(void)
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 99% of the initial value, we can
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
@@ -90,12 +90,13 @@ static void tp_example_read_task(void *pvParameter)
} 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\n", value, s_pad_init_val[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;
@@ -115,7 +116,7 @@ static void tp_example_read_task(void *pvParameter)
// We can compare the two different mode.
if (change_mode++ % 2000 == 0) {
filter_mode = !filter_mode;
ESP_LOGI(TAG, "Change mode...%s\n", filter_mode == 0? "interrupt mode": "filter mode");
ESP_LOGW(TAG, "Change mode...%s", filter_mode == 0? "interrupt mode": "filter mode");
}
}
}
@@ -152,26 +153,20 @@ void app_main()
// 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);
// Initialize and start a software filter to detect slight change of capacitance.
touch_pad_filter_start(10);
// Set measuring time and sleep time
// In this case, measurement will sustain 0xffff / 8Mhz = 8.19ms
// Meanwhile, sleep time between two measurement will be 0x1000 / 150Khz = 27.3 ms
touch_pad_set_meas_time(0x1000, 0xffff);
//set reference voltage for charging/discharging
// In this case, the high reference valtage will be 2.4V - 1.5V = 0.9V
// The low reference voltage will be 0.8V, so that the procedure of charging
// and discharging would be very fast.
touch_pad_set_voltage(TOUCH_HVOLT_2V4, TOUCH_LVOLT_0V8, TOUCH_HVOLT_ATTEN_1V5);
touch_pad_filter_start(TOUCHPAD_FILTER_TOUCH_PERIOD);
// Init touch pad IO
tp_example_touch_pad_init();
// 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);
}