lvgl: Add driver for ft6x36 touch screen

This adds basic driver for touch screen controller FT6x36

Signed-off-by: Jerzy Kasenberg <[email protected]>

hw/drivers/display/lvgl/indev/ft6x36/pkg.yml

@@ -0,0 +1,35 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+pkg.name: hw/drivers/display/lvgl/indev/ft6x36
+pkg.description: LVGL touch screen driver for FT6x36
+pkg.author: "Apache Mynewt <[email protected]>"
+pkg.homepage: "http://mynewt.apache.org/"
+pkg.keywords:
+    - touchscreen
+    - lvgl
+
+pkg.deps:
+    - "@apache-mynewt-core/hw/bus/drivers/i2c_common"
+
+pkg.include_dirs:
+    - "@lvgl/src"
+
+pkg.init:
+    ft6x36_os_dev_create: 400
+    ft6x36_register_lv_indev: 1100

hw/drivers/display/lvgl/indev/ft6x36/src/ft6x36.c

@@ -0,0 +1,223 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include <stddef.h>
+#include <os/os_time.h>
+#include <hal/hal_gpio.h>
+#include <bus/drivers/i2c_common.h>
+#include <bsp/bsp.h>
+
+#include <hal/lv_hal_indev.h>
+#include <core/lv_disp.h>
+#include <modlog/modlog.h>
+
+#define FT6X36_ADDR                     0x38
+
+#define FT6X36_REG_DEVICE_MODE          0x00
+#define FT6X36_REG_GESTURE_ID           0x01
+#define FT6X36_REG_NUM_TOUCHES          0x02
+#define FT6X36_REG_P1_XH                0x03
+#define FT6X36_REG_P1_XL                0x04
+#define FT6X36_REG_P1_YH                0x05
+#define FT6X36_REG_P1_YL                0x06
+#define FT6X36_REG_P1_WEIGHT            0x07
+#define FT6X36_REG_P1_MISC              0x08
+#define FT6X36_REG_P2_XH                0x09
+#define FT6X36_REG_P2_XL                0x0A
+#define FT6X36_REG_P2_YH                0x0B
+#define FT6X36_REG_P2_YL                0x0C
+#define FT6X36_REG_P2_WEIGHT            0x0D
+#define FT6X36_REG_P2_MISC              0x0E
+#define FT6X36_REG_THRESHHOLD           0x80
+#define FT6X36_REG_FILTER_COEF          0x85
+#define FT6X36_REG_CTRL                 0x86
+#define FT6X36_REG_TIME_ENTER_MONITOR   0x87
+#define FT6X36_REG_TOUCHRATE_ACTIVE     0x88
+#define FT6X36_REG_TOUCHRATE_MONITOR    0x89
+#define FT6X36_REG_RADIAN_VALUE         0x91
+#define FT6X36_REG_OFFSET_LEFT_RIGHT    0x92
+#define FT6X36_REG_OFFSET_UP_DOWN       0x93
+#define FT6X36_REG_DISTANCE_LEFT_RIGHT  0x94
+#define FT6X36_REG_DISTANCE_UP_DOWN     0x95
+#define FT6X36_REG_DISTANCE_ZOOM        0x96
+#define FT6X36_REG_LIB_VERSION_H        0xA1
+#define FT6X36_REG_LIB_VERSION_L        0xA2
+#define FT6X36_REG_CHIPID               0xA3
+#define FT6X36_REG_INTERRUPT_MODE       0xA4
+#define FT6X36_REG_POWER_MODE           0xA5
+#define FT6X36_REG_FIRMWARE_VERSION     0xA6
+#define FT6X36_REG_PANEL_ID             0xA8
+#define FT6X36_REG_STATE                0xBC
+
+#define FT6X36_PMODE_ACTIVE             0x00
+#define FT6X36_PMODE_MONITOR            0x01
+#define FT6X36_PMODE_STANDBY            0x02
+#define FT6X36_PMODE_HIBERNATE          0x03
+
+#define FT6X36_VENDID                   0x11
+#define FT6206_CHIPID                   0x06
+#define FT6236_CHIPID                   0x36
+#define FT6336_CHIPID                   0x64
+
+#define FT6X36_DEFAULT_THRESHOLD        22
+
+static struct bus_i2c_node touch;
+static struct bus_i2c_node_cfg touch_i2c_cfg = {
+    .node_cfg.bus_name = MYNEWT_VAL(FT6X36_I2C_DEV_NAME),
+    .addr = FT6X36_ADDR,
+    .freq = MYNEWT_VAL(FT6X36_I2C_FREQ),
+};
+
+struct touch_screen_data {
+    int last_x;
+    int last_y;
+};
+
+struct os_dev *touch_dev;
+static lv_indev_drv_t ft6x36drv;
+static lv_indev_t *ft6x36dev;
+static struct touch_screen_data touch_screen_data;
+static bool ft6x36_notify;
+
+static int
+ft6x36_read_registers(struct os_dev *dev, uint8_t reg, uint8_t *buf, size_t buf_size)
+{
+    return bus_node_simple_write_read_transact(dev, &reg, 1, buf, buf_size);
+}
+
+static int
+ft6x36_read_register(struct os_dev *dev, uint8_t reg, uint8_t *reg_val)
+{
+    return bus_node_simple_write_read_transact(dev, &reg, 1, reg_val, 1);
+}
+
+static int
+ft6x36_write_register(struct os_dev *dev, uint8_t reg, uint8_t reg_val)
+{
+    uint8_t buf[2] = { reg, reg_val };
+
+    return bus_node_simple_write(dev, buf, 2);
+}
+
+static void
+ft6x36_int_isr(void *arg)
+{
+    ft6x36_notify = true;
+}
+
+/**
+ * Get the current position and state of the touchpad
+ * @param data store the read data here
+ */
+static void
+ft6x36read(lv_indev_drv_t *indev_drv, lv_indev_data_t *data)
+{
+    struct os_dev *dev = indev_drv->user_data;
+    uint8_t buf[5];
+    int16_t x;
+    int16_t y;
+    int16_t raw_x;
+    int16_t raw_y;
+    bool pressed;
+
+    if (MYNEWT_VAL(FT6X36_INT_PIN) < 0 || ft6x36_notify) {
+        ft6x36_notify = false;
+        ft6x36_read_registers(dev, FT6X36_REG_NUM_TOUCHES, buf, sizeof(buf));
+        raw_x = ((buf[1] << 8) | buf[2]);
+        raw_y = ((buf[3] << 8) | buf[4]);
+        pressed = buf[0] != 0;
+        if (pressed) {
+            x = raw_x & 0xFFF;
+            y = raw_y & 0xFFF;
+
+            if (x != touch_screen_data.last_x || y != touch_screen_data.last_y) {
+                FT6X36_LOG_DEBUG("Touch x=%d y=%d\n", x, y);
+            }
+
+            touch_screen_data.last_x = x;
+            touch_screen_data.last_y = y;
+            data->state = LV_INDEV_STATE_PRESSED;
+        } else {
+            x = touch_screen_data.last_x;
+            y = touch_screen_data.last_y;
+            data->state = LV_INDEV_STATE_RELEASED;
+        }
+        data->point.x = x;
+        data->point.y = y;
+    }
+}
+
+/**
+ * Initialize the FT6X36
+ */
+void
+ft6x36_register_lv_indev(void)
+{
+    uint8_t panel_id;
+    uint8_t chip_id;
+    int ret;
+
+    if (MYNEWT_VAL(FT6X36_RESET_PIN) >= 0) {
+        hal_gpio_init_out(MYNEWT_VAL(FT6X36_RESET_PIN), 1);
+    }
+    do {
+        ret = ft6x36_read_register(touch_dev, FT6X36_REG_PANEL_ID, &panel_id);
+        if (ret || panel_id != FT6X36_VENDID) {
+            FT6X36_LOG_ERROR("Touchscreen not detected.\n");
+            break;
+        }
+        ret = ft6x36_read_register(touch_dev, FT6X36_REG_CHIPID, &chip_id);
+        if (ret || chip_id != FT6336_CHIPID) {
+            FT6X36_LOG_ERROR("Touchscreen not detected.\n");
+            break;
+        }
+        if (MYNEWT_VAL(FT6X36_INT_PIN) >= 0) {
+            hal_gpio_irq_init(MYNEWT_VAL(FT6X36_INT_PIN),
+                              ft6x36_int_isr, NULL, HAL_GPIO_TRIG_FALLING, HAL_GPIO_PULL_NONE);
+        }
+        ft6x36_write_register(touch_dev, FT6X36_REG_DEVICE_MODE, 0x00);
+        ft6x36_write_register(touch_dev, FT6X36_REG_THRESHHOLD, MYNEWT_VAL(FT6X36_THRESHOLD));
+        ft6x36_write_register(touch_dev, FT6X36_REG_TOUCHRATE_ACTIVE, 0x0E);
+
+        /* Register a keypad input device */
+        lv_indev_drv_init(&ft6x36drv);
+        ft6x36drv.type = LV_INDEV_TYPE_POINTER;
+        ft6x36drv.read_cb = ft6x36read;
+        ft6x36drv.user_data = touch_dev;
+        ft6x36dev = lv_indev_drv_register(&ft6x36drv);
+        FT6X36_LOG_INFO("Touchscreen registered\n");
+    } while (0);
+}
+
+void
+ft6x36_os_dev_create(void)
+{
+    struct bus_node_callbacks cbs = {0};
+    int rc;
+
+    if (MYNEWT_VAL(FT6X36_RESET_PIN) >= 0) {
+        hal_gpio_init_out(MYNEWT_VAL(FT6X36_RESET_PIN), 1);
+    }
+
+    bus_node_set_callbacks((struct os_dev *)&touch, &cbs);
+
+    rc = bus_i2c_node_create("touch", &touch, &touch_i2c_cfg, NULL);
+    assert(rc == 0);
+    touch_dev = os_dev_open("touch", 0, NULL);
+}

hw/drivers/display/lvgl/indev/ft6x36/syscfg.yml

@@ -0,0 +1,46 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+syscfg.defs:
+    FT6X36_I2C_DEV_NAME:
+        description: SPI device name that LCD is connected to.
+        value: '"i2c0"'
+    FT6X36_I2C_FREQ:
+        description: I2C device frequency for touch screen
+        value: 400
+    FT6X36_INT_PIN:
+        description: FT6X36 interrupt pin.
+        value: -1
+    FT6X36_RESET_PIN:
+        description: FT6X36 reset pin.
+        value: -1
+    FT6X36_THRESHOLD:
+        description: FT6X36 threshold value.
+        value: 10
+
+    FT6X36_LOG_MODULE:
+        description: 'Numeric module ID to use for FT6X36 log messages.'
+        value: 36
+    FT6X36_LOG_LVL:
+        description: 'Minimum level for the FT6X36 log.'
+        value: 1
+
+syscfg.logs:
+    FT6X36_LOG:
+        module: MYNEWT_VAL(FT6X36_LOG_MODULE)
+        level: MYNEWT_VAL(FT6X36_LOG_LVL)

hw/drivers/display/lvgl/pkg.yml

@@ -75,6 +75,8 @@ pkg.deps.LVGL_XPT2046:
     - "@apache-mynewt-core/hw/drivers/display/lvgl/indev/xpt2046"
 pkg.deps.LVGL_STMPE610:
     - "@apache-mynewt-core/hw/drivers/display/lvgl/indev/stmpe610"
+pkg.deps.LVGL_FT6X36:
+    - "@apache-mynewt-core/hw/drivers/display/lvgl/indev/ft6x36"
 pkg.deps.LVGL_ADC_TOUCH:
     - "@apache-mynewt-core/hw/drivers/display/lvgl/indev/adc_touch"
 pkg.deps.LVGL_TRACKBALL:

hw/drivers/display/lvgl/syscfg.yml

@@ -43,6 +43,9 @@ syscfg.defs:
     LVGL_STMPE610:
         description: Enable STMPE610 touchscreen driver.
         value:
+    LVGL_FT6X36:
+        description: Enable FT6X36 touchscreen driver.
+        value:
     LVGL_CST816S:
         description: Enable CST816S touchscreen driver.
         value: