lvgl_esp32_drivers/lvgl_touch/ra8875_touch.c

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/**
* @file RA8875_TOUCH.c
*/
/*********************
* INCLUDES
*********************/
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include <stddef.h>
#include "ra8875_touch.h"
#include "../lvgl_tft/ra8875.h"
#ifndef CONFIG_LV_TFT_DISPLAY_CONTROLLER_RA8875
#error "Display controller must be RA8875"
#endif
/*********************
* DEFINES
*********************/
#define DEBUG false
#define TAG "RA8875-Touch"
#define DIV_ROUND_UP(n, d) (((n)+(d)-1)/(d))
#define INTC2_TP_INT (0x04)
#define TPCR0_ADC_TIMING ((CONFIG_LV_TOUCH_RA8875_SAMPLE_TIME << 4) | CONFIG_LV_TOUCH_RA8875_ADC_CLOCK)
#if LVGL_TOUCH_RA8875_WAKEUP_ENABLE
#define TPCR0_VAL (0x08 | TPCR0_ADC_TIMING)
#else
#define TPCR0_VAL (TPCR0_ADC_TIMING)
#endif
#if LVGL_TOUCH_RA8875_EXTERNAL_VREF
#if LVGL_TOUCH_RA8875_DEBOUNCE_ENABLE
#define TPCR1_VAL (0x24)
#else
#define TPCR1_VAL (0x20)
#endif
#else
#if LVGL_TOUCH_RA8875_DEBOUNCE_ENABLE
#define TPCR1_VAL (0x04)
#else
#define TPCR1_VAL (0x00)
#endif
#endif
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void ra8875_corr(int * x, int * y);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
void ra8875_touch_init(void)
{
struct {
uint8_t cmd; // Register address of command
uint8_t data; // Value to write to register
} init_cmds[] = {
{RA8875_REG_TPCR0, TPCR0_VAL}, // Touch Panel Control Register 0 (TPCR0)
{RA8875_REG_TPCR1, TPCR1_VAL}, // Touch Panel Control Register 1 (TPCR1)
};
#define INIT_CMDS_SIZE (sizeof(init_cmds)/sizeof(init_cmds[0]))
ESP_LOGI(TAG, "Initializing RA8875 Touch...");
// Send all the commands
for (unsigned int i = 0; i < INIT_CMDS_SIZE; i++) {
ra8875_write_cmd(init_cmds[i].cmd, init_cmds[i].data);
}
ra8875_touch_enable(true);
}
void ra8875_touch_enable(bool enable)
{
ESP_LOGI(TAG, "%s touch.", enable ? "Enabling" : "Disabling");
uint8_t val = enable ? (0x80 | TPCR0_VAL) : (TPCR0_VAL);
ra8875_write_cmd(RA8875_REG_TPCR0, val);
}
/**
* Get the current position and state of the touchscreen
* @param data store the read data here
* @return false: because no more data to be read
*/
bool ra8875_touch_read(lv_indev_drv_t * drv, lv_indev_data_t * data)
{
static int x = 0;
static int y = 0;
int intr = ra8875_read_cmd(RA8875_REG_INTC2); // Interrupt Control Register2 (INTC2)
data->state = (intr & INTC2_TP_INT) ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL;
if (data->state == LV_INDEV_STATE_PR) {
x = ra8875_read_cmd(RA8875_REG_TPXH); // Touch Panel X High Byte Data Register (TPXH)
y = ra8875_read_cmd(RA8875_REG_TPYH); // Touch Panel Y High Byte Data Register (TPYH)
int xy = ra8875_read_cmd(RA8875_REG_TPXYL); // Touch Panel X/Y Low Byte Data Register (TPXYL)
x = (x << 2) | (xy & 0x03);
y = (y << 2) | ((xy >> 2) & 0x03);
#if DEBUG
ESP_LOGI(TAG, "Touch Poll Raw: %d,%d", x, y);
#endif
// Convert to display coordinates
ra8875_corr(&x, &y);
// Clear interrupt
ra8875_write_cmd(RA8875_REG_INTC2, INTC2_TP_INT); // Interrupt Control Register2 (INTC2)
}
data->point.x = x;
data->point.y = y;
#if DEBUG
ESP_LOGI(TAG, "Touch Poll - Event: %d; %d,%d", data->state, data->point.x, data->point.y);
#endif
return false;
}
/**********************
* STATIC FUNCTIONS
**********************/
static void ra8875_corr(int * x, int * y)
{
#if RA8875_XY_SWAP != 0
int tmp = *x;
*x = *y;
*y = tmp;
#endif
if ((*x) <= RA8875_X_MIN) {
(*x) = 0;
} else if ((*x) >= RA8875_X_MAX) {
(*x) = LV_HOR_RES-1;
} else {
(*x) = (((*x) - RA8875_X_MIN) * (LV_HOR_RES-1)) / (RA8875_X_MAX - RA8875_X_MIN);
}
if ((*y) <= RA8875_Y_MIN) {
(*y) = 0;
} else if ((*y) >= RA8875_Y_MAX) {
(*y) = LV_VER_RES-1;
} else {
(*y) = (((*y) - RA8875_Y_MIN) * (LV_VER_RES-1)) / (RA8875_Y_MAX - RA8875_Y_MIN);
}
#if RA8875_X_INV != 0
(*x) = (LV_HOR_RES-1) - (*x);
#endif
#if RA8875_Y_INV != 0
(*y) = (LV_VER_RES-1) - (*y);
#endif
}