202 lines
7.6 KiB
C
202 lines
7.6 KiB
C
/*
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* Copyright © 2020 Wolfgang Christl
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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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#include <driver/i2c.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 "ft6x36.h"
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#include "tp_i2c.h"
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#include "../lvgl_i2c_conf.h"
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#define TAG "FT6X36"
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ft6x36_status_t ft6x36_status;
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uint8_t current_dev_addr; // set during init
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esp_err_t ft6x06_i2c_read8(uint8_t slave_addr, uint8_t register_addr, uint8_t *data_buf) {
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i2c_cmd_handle_t i2c_cmd = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd);
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i2c_master_write_byte(i2c_cmd, (slave_addr << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd, register_addr, I2C_MASTER_ACK);
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i2c_master_start(i2c_cmd);
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i2c_master_write_byte(i2c_cmd, (slave_addr << 1) | I2C_MASTER_READ, true);
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i2c_master_read_byte(i2c_cmd, data_buf, I2C_MASTER_NACK);
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i2c_master_stop(i2c_cmd);
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esp_err_t ret = i2c_master_cmd_begin(TOUCH_I2C_PORT, i2c_cmd, 1000 / portTICK_RATE_MS);
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i2c_cmd_link_delete(i2c_cmd);
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return ret;
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}
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/**
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* @brief Read the FT6x36 gesture ID. Initialize first!
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* @param dev_addr: I2C FT6x36 Slave address.
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* @retval The gesture ID or 0x00 in case of failure
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*/
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uint8_t ft6x36_get_gesture_id() {
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if (!ft6x36_status.inited) {
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ESP_LOGE(TAG, "Init first!");
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return 0x00;
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}
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uint8_t data_buf;
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esp_err_t ret;
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if ((ret = ft6x06_i2c_read8(current_dev_addr, FT6X36_GEST_ID_REG, &data_buf) != ESP_OK))
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ESP_LOGE(TAG, "Error reading from device: %s", esp_err_to_name(ret));
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return data_buf;
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}
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/**
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* @brief Initialize for FT6x36 communication via I2C
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* @param dev_addr: Device address on communication Bus (I2C slave address of FT6X36).
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* @retval None
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*/
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void ft6x06_init(uint16_t dev_addr) {
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if (!ft6x36_status.inited) {
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/* I2C master is initialized before calling this function */
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#if 0
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esp_err_t code = i2c_master_init();
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#else
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esp_err_t code = ESP_OK;
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#endif
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if (code != ESP_OK) {
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ft6x36_status.inited = false;
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ESP_LOGE(TAG, "Error during I2C init %s", esp_err_to_name(code));
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} else {
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ft6x36_status.inited = true;
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current_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, "Found touch panel controller");
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if ((ret = ft6x06_i2c_read8(dev_addr, FT6X36_PANEL_ID_REG, &data_buf) != 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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ESP_LOGI(TAG, "\tDevice ID: 0x%02x", data_buf);
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ft6x06_i2c_read8(dev_addr, FT6X36_CHIPSELECT_REG, &data_buf);
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ESP_LOGI(TAG, "\tChip ID: 0x%02x", data_buf);
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ft6x06_i2c_read8(dev_addr, FT6X36_DEV_MODE_REG, &data_buf);
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ESP_LOGI(TAG, "\tDevice mode: 0x%02x", data_buf);
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ft6x06_i2c_read8(dev_addr, FT6X36_FIRMWARE_ID_REG, &data_buf);
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ESP_LOGI(TAG, "\tFirmware ID: 0x%02x", data_buf);
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ft6x06_i2c_read8(dev_addr, FT6X36_RELEASECODE_REG, &data_buf);
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ESP_LOGI(TAG, "\tRelease code: 0x%02x", data_buf);
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}
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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 ft6x36_read(lv_indev_drv_t *drv, lv_indev_data_t *data) {
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uint8_t data_xy[4]; // 2 bytes X | 2 bytes Y
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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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ft6x06_i2c_read8(current_dev_addr, FT6X36_TD_STAT_REG, &touch_pnt_cnt);
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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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// Read X value
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i2c_cmd_handle_t i2c_cmd = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd);
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i2c_master_write_byte(i2c_cmd, (current_dev_addr << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd, FT6X36_P1_XH_REG, I2C_MASTER_ACK);
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i2c_master_start(i2c_cmd);
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i2c_master_write_byte(i2c_cmd, (current_dev_addr << 1) | I2C_MASTER_READ, true);
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i2c_master_read_byte(i2c_cmd, &data_xy[0], I2C_MASTER_ACK); // reads FT6X36_P1_XH_REG
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i2c_master_read_byte(i2c_cmd, &data_xy[1], I2C_MASTER_NACK); // reads FT6X36_P1_XL_REG
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i2c_master_stop(i2c_cmd);
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esp_err_t ret = i2c_master_cmd_begin(TOUCH_I2C_PORT, i2c_cmd, 1000 / portTICK_RATE_MS);
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i2c_cmd_link_delete(i2c_cmd);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Error getting X coordinates: %s", esp_err_to_name(ret));
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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; // no touch detected
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return false;
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}
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// Read Y value
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i2c_cmd = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd);
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i2c_master_write_byte(i2c_cmd, (current_dev_addr << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd, FT6X36_P1_YH_REG, I2C_MASTER_ACK);
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i2c_master_start(i2c_cmd);
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i2c_master_write_byte(i2c_cmd, (current_dev_addr << 1) | I2C_MASTER_READ, true);
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i2c_master_read_byte(i2c_cmd, &data_xy[2], I2C_MASTER_ACK); // reads FT6X36_P1_YH_REG
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i2c_master_read_byte(i2c_cmd, &data_xy[3], I2C_MASTER_NACK); // reads FT6X36_P1_YL_REG
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i2c_master_stop(i2c_cmd);
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ret = i2c_master_cmd_begin(TOUCH_I2C_PORT, i2c_cmd, 1000 / portTICK_RATE_MS);
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i2c_cmd_link_delete(i2c_cmd);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Error getting Y coordinates: %s", esp_err_to_name(ret));
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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; // no touch detected
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return false;
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}
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last_x = ((data_xy[0] & FT6X36_MSB_MASK) << 8) | (data_xy[1] & FT6X36_LSB_MASK);
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last_y = ((data_xy[2] & FT6X36_MSB_MASK) << 8) | (data_xy[3] & FT6X36_LSB_MASK);
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#if CONFIG_LV_FT6X36_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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#if CONFIG_LV_FT6X36_INVERT_X
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last_x = LV_HOR_RES - last_x;
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#endif
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#if CONFIG_LV_FT6X36_INVERT_Y
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last_y = LV_VER_RES - last_y;
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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_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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