145 lines
5.7 KiB
C
145 lines
5.7 KiB
C
/*
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* Copyright © 2021 Sturnus Inc.
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this
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* software and associated documentation files (the “Software”), to deal in the Software
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* without restriction, including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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* to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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* FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <esp_log.h>
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#ifdef LV_LVGL_H_INCLUDE_SIMPLE
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#include <lvgl.h>
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#else
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#include <lvgl/lvgl.h>
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#endif
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#include "gt911.h"
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#include "lvgl_i2c/i2c_manager.h"
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#define TAG "GT911"
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gt911_status_t gt911_status;
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//TODO: handle multibyte read and refactor to just one read transaction
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esp_err_t gt911_i2c_read(uint8_t slave_addr, uint16_t register_addr, uint8_t *data_buf, uint8_t len) {
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return lvgl_i2c_read(CONFIG_LV_I2C_TOUCH_PORT, slave_addr, register_addr | I2C_REG_16, data_buf, len);
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}
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esp_err_t gt911_i2c_write8(uint8_t slave_addr, uint16_t register_addr, uint8_t data) {
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uint8_t buffer = data;
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return lvgl_i2c_write(CONFIG_LV_I2C_TOUCH_PORT, slave_addr, register_addr | I2C_REG_16, &buffer, 1);
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}
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/**
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* @brief Initialize for GT911 communication via I2C
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* @param dev_addr: Device address on communication Bus (I2C slave address of GT911).
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* @retval None
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*/
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void gt911_init(uint8_t dev_addr) {
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if (!gt911_status.inited) {
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gt911_status.i2c_dev_addr = dev_addr;
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uint8_t data_buf;
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esp_err_t ret;
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ESP_LOGI(TAG, "Checking for GT911 Touch Controller");
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if ((ret = gt911_i2c_read(dev_addr, GT911_PRODUCT_ID1, &data_buf, 1) != ESP_OK)) {
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ESP_LOGE(TAG, "Error reading from device: %s",
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esp_err_to_name(ret)); // Only show error the first time
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return;
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}
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// Read 4 bytes for Product ID in ASCII
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for (int i = 0; i < GT911_PRODUCT_ID_LEN; i++) {
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gt911_i2c_read(dev_addr, (GT911_PRODUCT_ID1 + i), (uint8_t *)&(gt911_status.product_id[i]), 1);
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}
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ESP_LOGI(TAG, "\tProduct ID: %s", gt911_status.product_id);
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gt911_i2c_read(dev_addr, GT911_VENDOR_ID, &data_buf, 1);
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ESP_LOGI(TAG, "\tVendor ID: 0x%02x", data_buf);
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gt911_i2c_read(dev_addr, GT911_X_COORD_RES_L, &data_buf, 1);
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gt911_status.max_x_coord = data_buf;
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gt911_i2c_read(dev_addr, GT911_X_COORD_RES_H, &data_buf, 1);
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gt911_status.max_x_coord |= ((uint16_t)data_buf << 8);
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ESP_LOGI(TAG, "\tX Resolution: %d", gt911_status.max_x_coord);
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gt911_i2c_read(dev_addr, GT911_Y_COORD_RES_L, &data_buf, 1);
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gt911_status.max_y_coord = data_buf;
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gt911_i2c_read(dev_addr, GT911_Y_COORD_RES_H, &data_buf, 1);
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gt911_status.max_y_coord |= ((uint16_t)data_buf << 8);
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ESP_LOGI(TAG, "\tY Resolution: %d", gt911_status.max_y_coord);
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gt911_status.inited = true;
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}
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}
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/**
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* @brief Get the touch screen X and Y positions values. Ignores multi touch
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* @param drv:
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* @param data: Store data here
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* @retval Always false
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*/
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bool gt911_read(lv_indev_drv_t *drv, lv_indev_data_t *data) {
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uint8_t touch_pnt_cnt; // Number of detected touch points
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static int16_t last_x = 0; // 12bit pixel value
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static int16_t last_y = 0; // 12bit pixel value
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uint8_t data_buf;
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uint8_t status_reg;
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gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_STATUS_REG, &status_reg, 1);
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// ESP_LOGI(TAG, "\tstatus: 0x%02x", status_reg);
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touch_pnt_cnt = status_reg & 0x0F;
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if ((status_reg & 0x80) || (touch_pnt_cnt < 6)) {
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//Reset Status Reg Value
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gt911_i2c_write8(gt911_status.i2c_dev_addr, GT911_STATUS_REG, 0x00);
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}
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if (touch_pnt_cnt != 1) { // ignore no touch & multi touch
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data->point.x = last_x;
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data->point.y = last_y;
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data->state = LV_INDEV_STATE_REL;
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return false;
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}
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// gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_TRACK_ID1, &data_buf, 1);
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// ESP_LOGI(TAG, "\ttrack_id: %d", data_buf);
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gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_PT1_X_COORD_L, &data_buf, 1);
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last_x = data_buf;
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gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_PT1_X_COORD_H, &data_buf, 1);
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last_x |= ((uint16_t)data_buf << 8);
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gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_PT1_Y_COORD_L, &data_buf, 1);
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last_y = data_buf;
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gt911_i2c_read(gt911_status.i2c_dev_addr, GT911_PT1_Y_COORD_H, &data_buf, 1);
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last_y |= ((uint16_t)data_buf << 8);
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#if CONFIG_LV_GT911_INVERT_X
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last_x = gt911_status.max_x_coord - last_x;
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#endif
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#if CONFIG_LV_GT911_INVERT_Y
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last_y = gt911_status.max_y_coord - last_y;
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#endif
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#if CONFIG_LV_GT911_SWAPXY
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int16_t swap_buf = last_x;
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last_x = last_y;
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last_y = swap_buf;
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#endif
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data->point.x = last_x;
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data->point.y = last_y;
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data->state = LV_INDEV_STATE_PR;
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ESP_LOGI(TAG, "X=%u Y=%u", data->point.x, data->point.y);
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ESP_LOGV(TAG, "X=%u Y=%u", data->point.x, data->point.y);
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return false;
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}
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