Trackball rewrite (#600)
- Implement generic trackball settings - Refactor T-Deck trackball driver into generic driver at `Drivers/gpio-trackball-module` - Automatically bind/unbind trackball devices with LVGL - Automatically load settings for trackball devices on boot
This commit is contained in:
Ken Van Hoeylandt
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c729e8340f
@@ -0,0 +1,11 @@
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cmake_minimum_required(VERSION 3.20)
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include("${CMAKE_CURRENT_LIST_DIR}/../../Buildscripts/module.cmake")
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file(GLOB_RECURSE SOURCE_FILES "source/*.c*")
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tactility_add_module(gpio-trackball-module
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SRCS ${SOURCE_FILES}
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INCLUDE_DIRS include/
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REQUIRES TactilityKernel
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)
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@@ -0,0 +1,195 @@
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Apache License
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==============
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@@ -0,0 +1,27 @@
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# GPIO Trackball
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Kernel driver for a 5-way GPIO trackball (4 direction pins + a click button), exposing a
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`TRACKBALL_TYPE` device (`tactility/drivers/trackball.h`).
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Devicetree binding: `tactility,gpio-trackball` (see `bindings/tactility,gpio-trackball.yaml`).
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Each direction pin is wired to a falling-edge interrupt that accumulates a signed delta;
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the click pin is active-low and read on any edge. `read_delta()` drains and resets the
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accumulated delta on each call.
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## Example
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```dts
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trackball {
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compatible = "tactility,gpio-trackball";
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pin-right = <&gpio0 1 GPIO_FLAG_NONE>;
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pin-up = <&gpio0 2 GPIO_FLAG_NONE>;
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pin-left = <&gpio0 3 GPIO_FLAG_NONE>;
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pin-down = <&gpio0 4 GPIO_FLAG_NONE>;
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pin-click = <&gpio0 5 GPIO_FLAG_NONE>;
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};
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```
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## License
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||||
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[Apache License Version 2.0](LICENSE-Apache-2.0.md)
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+2
-2
@@ -1,6 +1,6 @@
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description: LilyGO T-Deck 5-way GPIO trackball (4 directions + click button)
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description: 5-way GPIO trackball (4 directions + click button)
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compatible: "lilygo,tdeck-trackball"
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compatible: "tactility,gpio-trackball"
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properties:
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pin-right:
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@@ -0,0 +1,3 @@
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dependencies:
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- TactilityKernel
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bindings: bindings
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@@ -0,0 +1,7 @@
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include <tactility/bindings/bindings.h>
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#include <drivers/gpio_trackball.h>
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DEFINE_DEVICETREE(gpio_trackball, struct GpioTrackballConfig)
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@@ -0,0 +1,25 @@
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <tactility/drivers/gpio.h>
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#include <tactility/error.h>
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#include <stdbool.h>
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#include <stdint.h>
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struct Device;
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struct GpioTrackballConfig {
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struct GpioPinSpec pin_right;
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struct GpioPinSpec pin_up;
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struct GpioPinSpec pin_left;
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struct GpioPinSpec pin_down;
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struct GpioPinSpec pin_click;
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};
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#ifdef __cplusplus
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}
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#endif
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@@ -0,0 +1,14 @@
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include <tactility/module.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern struct Module gpio_trackball_module;
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#ifdef __cplusplus
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}
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#endif
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+22
-32
@@ -1,20 +1,22 @@
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// SPDX-License-Identifier: Apache-2.0
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#include <lilygo/drivers/tdeck_trackball.h>
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#include <drivers/gpio_trackball.h>
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#include <tactility/device.h>
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#include <tactility/driver.h>
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#include <tactility/drivers/gpio_controller.h>
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#include <tactility/drivers/gpio_descriptor.h>
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#include <tactility/drivers/trackball.h>
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#include <tactility/log.h>
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#include <atomic>
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#include <new>
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#define TAG "tdeck_trackball"
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#define GET_CONFIG(device) (static_cast<const TdeckTrackballConfig*>((device)->config))
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#define GET_INTERNAL(device) (static_cast<TdeckTrackballInternal*>(device_get_driver_data(device)))
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constexpr auto* TAG = "gpio_trackball";
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struct TdeckTrackballInternal {
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#define GET_CONFIG(device) (static_cast<const GpioTrackballConfig*>((device)->config))
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#define GET_INTERNAL(device) (static_cast<GpioTrackballInternal*>(device_get_driver_data(device)))
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struct GpioTrackballInternal {
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GpioDescriptor* pin_right = nullptr;
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GpioDescriptor* pin_up = nullptr;
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GpioDescriptor* pin_left = nullptr;
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@@ -29,23 +31,23 @@ struct TdeckTrackballInternal {
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// region ISR callbacks
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static void on_right(void* arg) {
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static_cast<TdeckTrackballInternal*>(arg)->dx.fetch_add(1, std::memory_order_relaxed);
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static_cast<GpioTrackballInternal*>(arg)->dx.fetch_add(1, std::memory_order_relaxed);
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}
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static void on_left(void* arg) {
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static_cast<TdeckTrackballInternal*>(arg)->dx.fetch_sub(1, std::memory_order_relaxed);
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static_cast<GpioTrackballInternal*>(arg)->dx.fetch_sub(1, std::memory_order_relaxed);
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}
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static void on_down(void* arg) {
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static_cast<TdeckTrackballInternal*>(arg)->dy.fetch_add(1, std::memory_order_relaxed);
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static_cast<GpioTrackballInternal*>(arg)->dy.fetch_add(1, std::memory_order_relaxed);
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}
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static void on_up(void* arg) {
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static_cast<TdeckTrackballInternal*>(arg)->dy.fetch_sub(1, std::memory_order_relaxed);
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static_cast<GpioTrackballInternal*>(arg)->dy.fetch_sub(1, std::memory_order_relaxed);
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}
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static void on_click(void* arg) {
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auto* internal = static_cast<TdeckTrackballInternal*>(arg);
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auto* internal = static_cast<GpioTrackballInternal*>(arg);
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bool high = true;
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gpio_descriptor_get_level(internal->pin_click, &high);
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// Active low: pressed when level is low
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@@ -90,7 +92,7 @@ static void release_pin(GpioDescriptor*& descriptor) {
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descriptor = nullptr;
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}
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static void release_all_pins(TdeckTrackballInternal* internal) {
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static void release_all_pins(GpioTrackballInternal* internal) {
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release_pin(internal->pin_right);
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release_pin(internal->pin_up);
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release_pin(internal->pin_left);
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@@ -114,19 +116,11 @@ static error_t get_button_pressed(Device* device, bool* out_pressed) {
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return ERROR_NONE;
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}
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error_t tdeck_trackball_read_delta(Device* device, int32_t* out_dx, int32_t* out_dy) {
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return read_delta(device, out_dx, out_dy);
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}
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error_t tdeck_trackball_get_button_pressed(Device* device, bool* out_pressed) {
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return get_button_pressed(device, out_pressed);
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||||
}
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||||
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||||
static error_t start(Device* device) {
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LOG_I(TAG, "start %s", device->name);
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auto* config = GET_CONFIG(device);
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auto* internal = new(std::nothrow) TdeckTrackballInternal();
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||||
auto* internal = new(std::nothrow) GpioTrackballInternal();
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||||
if (internal == nullptr) {
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||||
return ERROR_OUT_OF_MEMORY;
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||||
}
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||||
@@ -168,25 +162,21 @@ static error_t stop(Device* device) {
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||||
return ERROR_NONE;
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||||
}
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||||
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||||
static constexpr TdeckTrackballApi TDECK_TRACKBALL_API = {
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||||
static constexpr TrackballApi GPIO_TRACKBALL_API = {
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||||
.read_delta = read_delta,
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||||
.get_button_pressed = get_button_pressed,
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||||
};
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||||
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||||
const struct DeviceType TDECK_TRACKBALL_TYPE {
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||||
.name = "tdeck-trackball"
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||||
};
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||||
extern Module gpio_trackball_module;
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||||
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||||
extern Module lilygo_module;
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||||
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||||
Driver tdeck_trackball_driver = {
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||||
.name = "tdeck_trackball",
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||||
.compatible = (const char*[]) { "lilygo,tdeck-trackball", nullptr },
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||||
Driver gpio_trackball_driver = {
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||||
.name = "gpio_trackball",
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||||
.compatible = (const char*[]) { "tactility,gpio-trackball", nullptr },
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||||
.start_device = start,
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||||
.stop_device = stop,
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||||
.api = &TDECK_TRACKBALL_API,
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||||
.device_type = &TDECK_TRACKBALL_TYPE,
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||||
.owner = &lilygo_module,
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||||
.api = &GPIO_TRACKBALL_API,
|
||||
.device_type = &TRACKBALL_TYPE,
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||||
.owner = &gpio_trackball_module,
|
||||
.internal = nullptr
|
||||
};
|
||||
|
||||
@@ -0,0 +1,19 @@
|
||||
// SPDX-License-Identifier: Apache-2.0
|
||||
#include <tactility/driver.h>
|
||||
#include <tactility/module.h>
|
||||
|
||||
extern "C" {
|
||||
|
||||
extern Driver gpio_trackball_driver;
|
||||
|
||||
static Driver* const gpio_trackball_drivers[] = {
|
||||
&gpio_trackball_driver,
|
||||
nullptr
|
||||
};
|
||||
|
||||
Module gpio_trackball_module = {
|
||||
.name = "gpio-trackball",
|
||||
.drivers = gpio_trackball_drivers
|
||||
};
|
||||
|
||||
} // extern "C"
|
||||
@@ -1,7 +0,0 @@
|
||||
// SPDX-License-Identifier: Apache-2.0
|
||||
#pragma once
|
||||
|
||||
#include <tactility/bindings/bindings.h>
|
||||
#include <lilygo/drivers/tdeck_trackball.h>
|
||||
|
||||
DEFINE_DEVICETREE(tdeck_trackball, struct TdeckTrackballConfig)
|
||||
@@ -1,62 +0,0 @@
|
||||
// SPDX-License-Identifier: Apache-2.0
|
||||
#pragma once
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
#include <tactility/drivers/gpio.h>
|
||||
#include <tactility/error.h>
|
||||
#include <stdbool.h>
|
||||
#include <stdint.h>
|
||||
|
||||
struct Device;
|
||||
struct DeviceType;
|
||||
|
||||
struct TdeckTrackballConfig {
|
||||
struct GpioPinSpec pin_right;
|
||||
struct GpioPinSpec pin_up;
|
||||
struct GpioPinSpec pin_left;
|
||||
struct GpioPinSpec pin_down;
|
||||
struct GpioPinSpec pin_click;
|
||||
};
|
||||
|
||||
/**
|
||||
* @brief API for the T-Deck 5-way trackball driver.
|
||||
* Reports raw, unscaled movement: sensitivity and mode (encoder vs. pointer) are UI concerns
|
||||
* layered on top by the consumer, not something this driver knows about.
|
||||
*/
|
||||
struct TdeckTrackballApi {
|
||||
/**
|
||||
* @brief Reads the accumulated movement since the last read, then resets it to zero.
|
||||
* @param[in] device the trackball device
|
||||
* @param[out] out_dx horizontal movement (right positive), in raw pulses
|
||||
* @param[out] out_dy vertical movement (down positive), in raw pulses
|
||||
* @retval ERROR_NONE when the operation was successful
|
||||
*/
|
||||
error_t (*read_delta)(struct Device* device, int32_t* out_dx, int32_t* out_dy);
|
||||
|
||||
/**
|
||||
* @brief Gets whether the click button is currently pressed.
|
||||
* @param[in] device the trackball device
|
||||
* @param[out] out_pressed true when pressed
|
||||
* @retval ERROR_NONE when the operation was successful
|
||||
*/
|
||||
error_t (*get_button_pressed)(struct Device* device, bool* out_pressed);
|
||||
};
|
||||
|
||||
/**
|
||||
* @brief Reads the accumulated movement using the specified trackball device.
|
||||
*/
|
||||
error_t tdeck_trackball_read_delta(struct Device* device, int32_t* out_dx, int32_t* out_dy);
|
||||
|
||||
/**
|
||||
* @brief Gets whether the click button is currently pressed on the specified trackball device.
|
||||
*/
|
||||
error_t tdeck_trackball_get_button_pressed(struct Device* device, bool* out_pressed);
|
||||
|
||||
extern const struct DeviceType TDECK_TRACKBALL_TYPE;
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
@@ -1,56 +0,0 @@
|
||||
#pragma once
|
||||
|
||||
#include <lvgl.h>
|
||||
|
||||
namespace trackball {
|
||||
|
||||
/**
|
||||
* @brief Trackball operating mode
|
||||
*/
|
||||
enum class Mode {
|
||||
Encoder, // Navigation via enc_diff (scroll wheel behavior)
|
||||
Pointer // Mouse cursor via point.x/y
|
||||
};
|
||||
|
||||
/**
|
||||
* @brief Initialize trackball as an LVGL input device, backed by the kernel tdeck_trackball driver.
|
||||
* @return LVGL input device pointer, or nullptr if the kernel device isn't found/started
|
||||
*/
|
||||
lv_indev_t* init();
|
||||
|
||||
/**
|
||||
* @brief Deinitialize trackball
|
||||
*/
|
||||
void deinit();
|
||||
|
||||
/**
|
||||
* @brief Set encoder mode sensitivity
|
||||
* @param sensitivity Steps per trackball tick (1-10, default: 1)
|
||||
*/
|
||||
void setEncoderSensitivity(uint8_t sensitivity);
|
||||
|
||||
/**
|
||||
* @brief Set pointer mode sensitivity
|
||||
* @param sensitivity Pixels per trackball tick (1-10, default: 10)
|
||||
*/
|
||||
void setPointerSensitivity(uint8_t sensitivity);
|
||||
|
||||
/**
|
||||
* @brief Enable or disable trackball input processing
|
||||
* @param enabled Boolean value to enable or disable
|
||||
*/
|
||||
void setEnabled(bool enabled);
|
||||
|
||||
/**
|
||||
* @brief Set trackball operating mode
|
||||
* @param mode Encoder or Pointer mode
|
||||
*/
|
||||
void setMode(Mode mode);
|
||||
|
||||
/**
|
||||
* @brief Get current trackball operating mode
|
||||
* @return Current mode
|
||||
*/
|
||||
Mode getMode();
|
||||
|
||||
}
|
||||
@@ -6,13 +6,11 @@ extern "C" {
|
||||
|
||||
extern Driver tdeck_keyboard_driver;
|
||||
extern Driver tdeck_keyboard_backlight_driver;
|
||||
extern Driver tdeck_trackball_driver;
|
||||
extern Driver tpager_encoder_driver;
|
||||
|
||||
static Driver* const lilygo_drivers[] = {
|
||||
&tdeck_keyboard_driver,
|
||||
&tdeck_keyboard_backlight_driver,
|
||||
&tdeck_trackball_driver,
|
||||
&tpager_encoder_driver,
|
||||
nullptr
|
||||
};
|
||||
|
||||
@@ -1,201 +0,0 @@
|
||||
#include <lilygo/drivers/trackball.h>
|
||||
#include <lilygo/drivers/tdeck_trackball.h>
|
||||
|
||||
#include <Tactility/Assets.h>
|
||||
|
||||
#include <tactility/device.h>
|
||||
#include <tactility/log.h>
|
||||
|
||||
|
||||
constexpr auto* TAG = "Trackball";
|
||||
|
||||
namespace trackball {
|
||||
|
||||
static lv_indev_t* g_indev = nullptr;
|
||||
static Device* g_device = nullptr;
|
||||
static bool g_enabled = true;
|
||||
static Mode g_mode = Mode::Encoder;
|
||||
static uint8_t g_encoderSensitivity = 1;
|
||||
static uint8_t g_pointerSensitivity = 10;
|
||||
|
||||
// Pointer mode cursor position (screen-relative)
|
||||
static int32_t g_cursorX = 160;
|
||||
static int32_t g_cursorY = 120;
|
||||
|
||||
static lv_obj_t* g_cursor = nullptr;
|
||||
|
||||
// Screen dimensions (T-Deck: 320x240)
|
||||
static constexpr int32_t SCREEN_WIDTH = 320;
|
||||
static constexpr int32_t SCREEN_HEIGHT = 240;
|
||||
static constexpr int32_t CURSOR_SIZE = 16;
|
||||
|
||||
static inline int32_t clamp(int32_t val, int32_t minVal, int32_t maxVal) {
|
||||
if (val < minVal) return minVal;
|
||||
if (val > maxVal) return maxVal;
|
||||
return val;
|
||||
}
|
||||
|
||||
// Note: must be called from the LVGL thread (main thread), same as the setters below.
|
||||
static void read_cb(lv_indev_t* /*indev*/, lv_indev_data_t* data) {
|
||||
// Always drain accumulated movement so it doesn't jump on re-enable, but discard it while disabled.
|
||||
int32_t dx = 0;
|
||||
int32_t dy = 0;
|
||||
tdeck_trackball_read_delta(g_device, &dx, &dy);
|
||||
if (!g_enabled) {
|
||||
dx = 0;
|
||||
dy = 0;
|
||||
}
|
||||
|
||||
if (g_mode == Mode::Encoder) {
|
||||
int32_t ticks = (dx + dy) * static_cast<int32_t>(g_encoderSensitivity);
|
||||
data->enc_diff = static_cast<int16_t>(clamp(ticks, INT16_MIN, INT16_MAX));
|
||||
if (ticks != 0) {
|
||||
lv_display_trigger_activity(nullptr);
|
||||
}
|
||||
} else {
|
||||
g_cursorX = clamp(g_cursorX + dx * static_cast<int32_t>(g_pointerSensitivity), 0, SCREEN_WIDTH - CURSOR_SIZE - 1);
|
||||
g_cursorY = clamp(g_cursorY + dy * static_cast<int32_t>(g_pointerSensitivity), 0, SCREEN_HEIGHT - CURSOR_SIZE - 1);
|
||||
data->point.x = static_cast<int16_t>(g_cursorX);
|
||||
data->point.y = static_cast<int16_t>(g_cursorY);
|
||||
}
|
||||
|
||||
bool pressed = false;
|
||||
if (g_enabled) {
|
||||
tdeck_trackball_get_button_pressed(g_device, &pressed);
|
||||
}
|
||||
data->state = pressed ? LV_INDEV_STATE_PRESSED : LV_INDEV_STATE_RELEASED;
|
||||
|
||||
if (pressed) {
|
||||
lv_display_trigger_activity(nullptr);
|
||||
}
|
||||
}
|
||||
|
||||
lv_indev_t* init() {
|
||||
if (g_indev != nullptr) {
|
||||
LOG_W(TAG, "Already initialized");
|
||||
return g_indev;
|
||||
}
|
||||
|
||||
if (device_get_first_active_by_type(&TDECK_TRACKBALL_TYPE, &g_device) != ERROR_NONE) {
|
||||
LOG_E(TAG, "tdeck_trackball kernel device not found or not started");
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
g_cursorX = SCREEN_WIDTH / 2;
|
||||
g_cursorY = SCREEN_HEIGHT / 2;
|
||||
|
||||
g_indev = lv_indev_create();
|
||||
if (g_indev == nullptr) {
|
||||
LOG_E(TAG, "Failed to register LVGL input device");
|
||||
device_put(g_device);
|
||||
g_device = nullptr;
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
lv_indev_set_type(g_indev, LV_INDEV_TYPE_ENCODER);
|
||||
lv_indev_set_read_cb(g_indev, read_cb);
|
||||
LOG_I(TAG, "Initialized");
|
||||
|
||||
return g_indev;
|
||||
}
|
||||
|
||||
// Create cursor for pointer mode
|
||||
static void createCursor() {
|
||||
if (g_cursor != nullptr || g_indev == nullptr) return;
|
||||
|
||||
g_cursor = lv_image_create(lv_layer_sys());
|
||||
if (g_cursor != nullptr) {
|
||||
lv_obj_remove_flag(g_cursor, LV_OBJ_FLAG_CLICKABLE);
|
||||
lv_image_set_src(g_cursor, TT_ASSETS_UI_CURSOR);
|
||||
lv_indev_set_cursor(g_indev, g_cursor);
|
||||
LOG_D(TAG, "Cursor created");
|
||||
}
|
||||
}
|
||||
|
||||
// Destroy cursor when switching back to encoder mode
|
||||
static void destroyCursor() {
|
||||
if (g_cursor == nullptr) return;
|
||||
|
||||
// Delete the cursor object - this automatically detaches it from the indev
|
||||
lv_obj_delete(g_cursor);
|
||||
g_cursor = nullptr;
|
||||
LOG_D(TAG, "Cursor destroyed");
|
||||
}
|
||||
|
||||
void deinit() {
|
||||
if (g_indev == nullptr) return;
|
||||
|
||||
destroyCursor();
|
||||
|
||||
lv_indev_delete(g_indev);
|
||||
g_indev = nullptr;
|
||||
|
||||
device_put(g_device);
|
||||
g_device = nullptr;
|
||||
|
||||
g_mode = Mode::Encoder;
|
||||
g_enabled = true;
|
||||
LOG_I(TAG, "Deinitialized");
|
||||
}
|
||||
|
||||
void setEncoderSensitivity(uint8_t sensitivity) {
|
||||
if (sensitivity > 0) {
|
||||
g_encoderSensitivity = sensitivity;
|
||||
LOG_D(TAG, "Encoder sensitivity set to %d", sensitivity);
|
||||
}
|
||||
}
|
||||
|
||||
void setPointerSensitivity(uint8_t sensitivity) {
|
||||
if (sensitivity > 0) {
|
||||
g_pointerSensitivity = sensitivity;
|
||||
LOG_D(TAG, "Pointer sensitivity set to %d", sensitivity);
|
||||
}
|
||||
}
|
||||
|
||||
void setEnabled(bool enabled) {
|
||||
g_enabled = enabled;
|
||||
|
||||
if (g_cursor != nullptr) {
|
||||
if (enabled) {
|
||||
lv_obj_clear_flag(g_cursor, LV_OBJ_FLAG_HIDDEN);
|
||||
} else {
|
||||
lv_obj_add_flag(g_cursor, LV_OBJ_FLAG_HIDDEN);
|
||||
}
|
||||
}
|
||||
|
||||
LOG_I(TAG, "%s", enabled ? "Enabled" : "Disabled");
|
||||
}
|
||||
|
||||
void setMode(Mode mode) {
|
||||
if (g_indev == nullptr) {
|
||||
LOG_W(TAG, "Cannot set mode - not initialized");
|
||||
return;
|
||||
}
|
||||
|
||||
if (g_mode == mode) {
|
||||
return;
|
||||
}
|
||||
|
||||
g_mode = mode;
|
||||
|
||||
if (mode == Mode::Pointer) {
|
||||
lv_indev_set_type(g_indev, LV_INDEV_TYPE_POINTER);
|
||||
createCursor();
|
||||
if (!g_enabled && g_cursor != nullptr) {
|
||||
lv_obj_add_flag(g_cursor, LV_OBJ_FLAG_HIDDEN);
|
||||
}
|
||||
g_cursorX = SCREEN_WIDTH / 2;
|
||||
g_cursorY = SCREEN_HEIGHT / 2;
|
||||
LOG_I(TAG, "Switched to Pointer mode");
|
||||
} else {
|
||||
destroyCursor();
|
||||
lv_indev_set_type(g_indev, LV_INDEV_TYPE_ENCODER);
|
||||
LOG_I(TAG, "Switched to Encoder mode");
|
||||
}
|
||||
}
|
||||
|
||||
Mode getMode() {
|
||||
return g_mode;
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user