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