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lv_tc.c
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/*********************
* INCLUDES
*********************/
#include "lv_tc.h"
#include "math.h"
#ifdef ESP_PLATFORM
#include "esp_log.h"
#endif
/**********************
* DEFINES
*********************/
#define TAG "lv_tc"
/**********************
* STATIC PROTOTYPES
**********************/
static void lv_tc_indev_read_cb(lv_indev_t *indev, lv_indev_data_t *data);
/**********************
* STATIC VARIABLES
**********************/
static lv_tc_coeff_t calibResult = {false, 0, 0, 0, 0, 0, 0};
static lv_obj_t *registeredTCScreen = NULL;
static bool (*registeredInputCb)(lv_obj_t *screenObj, lv_indev_data_t *data) = NULL;
static void (*registeredSaveCb)(lv_tc_coeff_t coeff) = NULL;
/**********************
* GLOBAL FUNCTIONS
**********************/
void lv_tc_indev_init(lv_indev_t *indev) {
lv_indev_set_user_data(indev, (void*)lv_indev_get_read_cb(indev));
lv_indev_set_read_cb(indev, lv_tc_indev_read_cb);
}
void _lv_tc_register_input_cb(lv_obj_t *screenObj, bool (*inputCb)(lv_obj_t *screenObj, lv_indev_data_t *data)) {
registeredTCScreen = screenObj;
registeredInputCb = inputCb;
}
void lv_tc_register_coeff_save_cb(void (*saveCb)(lv_tc_coeff_t coeff)) {
registeredSaveCb = saveCb;
}
lv_tc_coeff_t* lv_tc_get_coeff() {
return &calibResult;
}
void lv_tc_set_coeff(lv_tc_coeff_t coeff, bool save) {
calibResult = coeff;
if(save) {
lv_tc_save_coeff();
}
}
#if defined CONFIG_USE_CUSTOM_LV_TC_COEFFICIENTS
void lv_tc_load_coeff_from_config() {
lv_tc_coeff_t coeff = {
true,
atoff(CONFIG_LV_TC_COEFFICIENT_A),
atoff(CONFIG_LV_TC_COEFFICIENT_B),
atoff(CONFIG_LV_TC_COEFFICIENT_C),
atoff(CONFIG_LV_TC_COEFFICIENT_D),
atoff(CONFIG_LV_TC_COEFFICIENT_E),
atoff(CONFIG_LV_TC_COEFFICIENT_F)
};
lv_tc_set_coeff(coeff, false);
}
#endif
void lv_tc_save_coeff() {
if(registeredSaveCb) {
registeredSaveCb(calibResult);
}
}
void lv_tc_compute_coeff(lv_point_t *scrP, lv_point_t *tchP, bool save) { //The computation is explained here: https://www.maximintegrated.com/en/design/technical-documents/app-notes/5/5296.html
const lv_tc_val_t divisor = (
(lv_tc_val_t)tchP[0].x * ((lv_tc_val_t)tchP[2].y - (lv_tc_val_t)tchP[1].y)
- (lv_tc_val_t)tchP[1].x * (lv_tc_val_t)tchP[2].y
+ (lv_tc_val_t)tchP[1].y * (lv_tc_val_t)tchP[2].x
+ (lv_tc_val_t)tchP[0].y * ((lv_tc_val_t)tchP[1].x - (lv_tc_val_t)tchP[2].x)
);
lv_tc_coeff_t result = {
true,
(
(lv_tc_val_t)scrP[0].x * ((lv_tc_val_t)tchP[2].y - (lv_tc_val_t)tchP[1].y)
- (lv_tc_val_t)scrP[1].x * (lv_tc_val_t)tchP[2].y
+ (lv_tc_val_t)scrP[2].x * (lv_tc_val_t)tchP[1].y
+ ((lv_tc_val_t)scrP[1].x - (lv_tc_val_t)scrP[2].x) * (lv_tc_val_t)tchP[0].y
) / divisor,
- (
(lv_tc_val_t)scrP[0].x * ((lv_tc_val_t)tchP[2].x - (lv_tc_val_t)tchP[1].x)
- (lv_tc_val_t)scrP[1].x * (lv_tc_val_t)tchP[2].x
+ (lv_tc_val_t)scrP[2].x * (lv_tc_val_t)tchP[1].x
+ ((lv_tc_val_t)scrP[1].x - (lv_tc_val_t)scrP[2].x) * (lv_tc_val_t)tchP[0].x
) / divisor,
(
(lv_tc_val_t)scrP[0].x * ((lv_tc_val_t)tchP[1].y * (lv_tc_val_t)tchP[2].x - (lv_tc_val_t)tchP[1].x * (lv_tc_val_t)tchP[2].y)
+ (lv_tc_val_t)tchP[0].x * ((lv_tc_val_t)scrP[1].x * (lv_tc_val_t)tchP[2].y - (lv_tc_val_t)scrP[2].x * (lv_tc_val_t)tchP[1].y)
+ (lv_tc_val_t)tchP[0].y * ((lv_tc_val_t)scrP[2].x * (lv_tc_val_t)tchP[1].x - (lv_tc_val_t)scrP[1].x * (lv_tc_val_t)tchP[2].x)
) / divisor,
(
(lv_tc_val_t)scrP[0].y * ((lv_tc_val_t)tchP[2].y - (lv_tc_val_t)tchP[1].y)
- (lv_tc_val_t)scrP[1].y * (lv_tc_val_t)tchP[2].y
+ (lv_tc_val_t)scrP[2].y * (lv_tc_val_t)tchP[1].y
+ ((lv_tc_val_t)scrP[1].y - (lv_tc_val_t)scrP[2].y) * (lv_tc_val_t)tchP[0].y
) / divisor,
- (
(lv_tc_val_t)scrP[0].y * ((lv_tc_val_t)tchP[2].x - (lv_tc_val_t)tchP[1].x)
- (lv_tc_val_t)scrP[1].y * (lv_tc_val_t)tchP[2].x
+ (lv_tc_val_t)scrP[2].y * (lv_tc_val_t)tchP[1].x
+ ((lv_tc_val_t)scrP[1].y - (lv_tc_val_t)scrP[2].y) * (lv_tc_val_t)tchP[0].x
) / divisor,
(
(lv_tc_val_t)scrP[0].y * ((lv_tc_val_t)tchP[1].y * (lv_tc_val_t)tchP[2].x - (lv_tc_val_t)tchP[1].x * (lv_tc_val_t)tchP[2].y)
+ (lv_tc_val_t)tchP[0].x * ((lv_tc_val_t)scrP[1].y * (lv_tc_val_t)tchP[2].y - (lv_tc_val_t)scrP[2].y * (lv_tc_val_t)tchP[1].y)
+ (lv_tc_val_t)tchP[0].y * ((lv_tc_val_t)scrP[2].y * (lv_tc_val_t)tchP[1].x - (lv_tc_val_t)scrP[1].y * (lv_tc_val_t)tchP[2].x)
) / divisor
};
lv_tc_set_coeff(result, save);
#ifdef ESP_PLATFORM
ESP_LOGI(TAG, "touch calibration coefficients -> [a: %f, b: %f, c: %f, d: %f, e: %f, f: %f]", result.a, result.b,
result.c, result.d, result.e, result.f);
#endif
}
lv_point_t _lv_tc_transform_point_indev(lv_indev_data_t *data) {
if(data->state == LV_INDEV_STATE_PRESSED) {
return lv_tc_transform_point(data->point);
} else {
//Reject invalid points if the touch panel is in released state
lv_point_t point = {0, 0};
return point;
}
}
lv_point_t lv_tc_transform_point(lv_point_t point) {
lv_point_t transformedPoint = point;
if(calibResult.isValid) {
transformedPoint.x = roundf((lv_tc_val_t)point.x * calibResult.a + (lv_tc_val_t)point.y * calibResult.b + calibResult.c);
transformedPoint.y = roundf((lv_tc_val_t)point.x * calibResult.d + (lv_tc_val_t)point.y * calibResult.e + calibResult.f);
}
return transformedPoint;
}
/**********************
* STATIC FUNCTIONS
**********************/
static void lv_tc_indev_read_cb(lv_indev_t *indev, lv_indev_data_t *data) {
if(!lv_indev_get_user_data(indev)) return;
//Call the actual indev read callback
((void (*)(lv_indev_t*, lv_indev_data_t*))lv_indev_get_user_data(indev))(indev, data);
//Pass the results to an ongoing calibration if there is one
if(registeredTCScreen && registeredInputCb && registeredTCScreen == lv_scr_act()) {
if(!registeredInputCb(registeredTCScreen, data)) {
//Override state and point if the input has been handled by the registered calibration screen
data->state = LV_INDEV_STATE_RELEASED;
lv_point_t point = {0, 0};
data->point = point;
return;
}
}
data->point = _lv_tc_transform_point_indev(data);
}