Device migrations, driver migrations and more (#575)
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Ken Van Hoeylandt
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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(cst816t-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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_Version 2.0, January 2004_
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@@ -0,0 +1,16 @@
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# CST816T touch controller
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A driver for the `CST816T` I2C capacitive touch controller by Hynitron.
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Implemented directly against the register. (no `esp_lcd_touch` dependency)
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- Manufacturer datasheet: https://github.com/koendv/cst816t/blob/master/extras/DS-CST816T%E6%95%B0%E6%8D%AE%E6%89%8B%E5%86%8CV2.2.pdf
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- Original/reference code: https://github.com/koendv/cst816t (Arduino driver, `src/cst816t.cpp`/`src/cst816t.h`), licensed under [The Unlicense](https://github.com/koendv/cst816t/blob/master/LICENSE)
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Single-touch only: the datasheet advertises "genuine two-point" support, but neither of the sources above documents a second touch-point register set, so only one point is read.
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`enter_sleep`/`exit_sleep` are unimplemented (`nullptr` in the `PointerApi`, per its "null if not supported" contract).
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The reference driver defines `REG_SLEEP_MODE` (0xE5) but never writes it, and the datasheet says waking from sleep needs
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a hardware reset pulse anyway, not a register write.
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License: [Apache v2.0](LICENSE-Apache-2.0.md)
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@@ -0,0 +1,45 @@
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description: Hynitron CST816T capacitive touch controller
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include: ["i2c-device.yaml"]
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compatible: "hynitron,cst816t"
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bus: i2c
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properties:
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x-max:
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type: int
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required: true
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description: Maximum X coordinate reported by the controller (typically the panel's horizontal resolution)
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y-max:
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type: int
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required: true
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description: Maximum Y coordinate reported by the controller (typically the panel's vertical resolution)
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swap-xy:
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type: boolean
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default: false
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description: Swap the X and Y axes
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mirror-x:
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type: boolean
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default: false
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description: Mirror the X axis
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mirror-y:
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type: boolean
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default: false
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description: Mirror the Y axis
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pin-reset:
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type: phandles
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default: GPIO_PIN_SPEC_NONE
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description: Reset GPIO pin
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pin-interrupt:
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type: phandles
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default: GPIO_PIN_SPEC_NONE
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description: Interrupt GPIO pin (currently unused - reads are polled via read_data())
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reset-active-high:
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type: boolean
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default: false
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description: Whether the reset pin is active high
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interrupt-active-high:
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type: boolean
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default: false
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description: Whether the interrupt pin is active high
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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/cst816t.h>
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DEFINE_DEVICETREE(cst816t, struct Cst816tConfig)
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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 cst816t_module;
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#ifdef __cplusplus
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}
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#endif
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@@ -0,0 +1,28 @@
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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 <stdint.h>
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#include <stdbool.h>
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#include <tactility/drivers/gpio.h>
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struct Cst816tConfig {
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uint8_t address;
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uint16_t x_max;
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uint16_t y_max;
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bool swap_xy;
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bool mirror_x;
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bool mirror_y;
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struct GpioPinSpec pin_reset;
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struct GpioPinSpec pin_interrupt;
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bool reset_active_high;
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bool interrupt_active_high;
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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 +1,254 @@
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// SPDX-License-Identifier: Apache-2.0
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#include <drivers/cst816t.h>
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#include <cst816t_module.h>
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#include <tactility/check.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/i2c_controller.h>
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#include <tactility/drivers/pointer.h>
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#include <tactility/error.h>
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#include <tactility/log.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#include <cstdlib>
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constexpr auto* TAG = "CST816T";
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#define GET_CONFIG(device) (static_cast<const Cst816tConfig*>((device)->config))
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// Register map and reset/bring-up sequence taken from https://github.com/koendv/cst816t
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// (src/cst816t.cpp) - the manufacturer datasheet (DS-CST816T V2.2) covers electrical
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// characteristics and I2C timing only, not the register map.
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static constexpr uint8_t REG_GESTURE_ID = 0x01;
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static constexpr uint8_t REG_CHIP_ID = 0xA7;
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static constexpr uint8_t REG_DIS_AUTOSLEEP = 0xFE;
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static constexpr TickType_t TIMEOUT = pdMS_TO_TICKS(50);
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struct Cst816tInternal {
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GpioDescriptor* reset_descriptor;
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bool swap_xy;
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bool mirror_x;
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bool mirror_y;
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bool touched;
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uint16_t x;
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uint16_t y;
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};
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// region Driver lifecycle
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// Timings match the reference driver linked above: it holds RST high for 100ms (well past the
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// datasheet's Tpor/Tron minimum of 100ms), pulses it low for 10ms (Trst minimum is 0.1ms), then
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// waits another 100ms (Tron) for the chip to finish reinitializing before any I2C traffic.
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static error_t reset_pulse(GpioDescriptor* descriptor, bool active_high) {
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bool idle_level = !active_high;
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bool ok = gpio_descriptor_set_flags(descriptor, GPIO_FLAG_DIRECTION_OUTPUT) == ERROR_NONE;
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ok = ok && gpio_descriptor_set_level(descriptor, idle_level) == ERROR_NONE;
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vTaskDelay(pdMS_TO_TICKS(100));
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ok = ok && gpio_descriptor_set_level(descriptor, active_high) == ERROR_NONE;
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vTaskDelay(pdMS_TO_TICKS(10));
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ok = ok && gpio_descriptor_set_level(descriptor, idle_level) == ERROR_NONE;
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vTaskDelay(pdMS_TO_TICKS(100));
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||||
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return ok ? ERROR_NONE : ERROR_RESOURCE;
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||||
}
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||||
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||||
static error_t start(Device* device) {
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||||
auto* parent = device_get_parent(device);
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||||
check(device_get_type(parent) == &I2C_CONTROLLER_TYPE);
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||||
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||||
const auto* config = GET_CONFIG(device);
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||||
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||||
auto* internal = static_cast<Cst816tInternal*>(malloc(sizeof(Cst816tInternal)));
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||||
if (internal == nullptr) {
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||||
return ERROR_OUT_OF_MEMORY;
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||||
}
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||||
internal->reset_descriptor = nullptr;
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||||
internal->swap_xy = config->swap_xy;
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||||
internal->mirror_x = config->mirror_x;
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||||
internal->mirror_y = config->mirror_y;
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||||
internal->touched = false;
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||||
internal->x = 0;
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internal->y = 0;
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||||
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if (config->pin_reset.gpio_controller != nullptr) {
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||||
internal->reset_descriptor = gpio_descriptor_acquire(config->pin_reset.gpio_controller, config->pin_reset.pin, GPIO_OWNER_GPIO);
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||||
if (internal->reset_descriptor == nullptr) {
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LOG_E(TAG, "Failed to acquire reset pin");
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free(internal);
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return ERROR_RESOURCE;
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||||
}
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||||
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||||
if (reset_pulse(internal->reset_descriptor, config->reset_active_high) != ERROR_NONE) {
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||||
LOG_E(TAG, "Failed to pulse reset pin");
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||||
gpio_descriptor_release(internal->reset_descriptor);
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||||
free(internal);
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||||
return ERROR_RESOURCE;
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||||
}
|
||||
}
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||||
|
||||
uint8_t chip_id = 0;
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||||
if (i2c_controller_register8_get(parent, config->address, REG_CHIP_ID, &chip_id, TIMEOUT) != ERROR_NONE) {
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||||
LOG_E(TAG, "Failed to read chip ID");
|
||||
if (internal->reset_descriptor != nullptr) {
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||||
gpio_descriptor_release(internal->reset_descriptor);
|
||||
}
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||||
free(internal);
|
||||
return ERROR_RESOURCE;
|
||||
}
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||||
LOG_I(TAG, "Chip ID 0x%02X", chip_id);
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||||
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||||
// Auto-sleep would otherwise drop the controller into standby after ~2s of inactivity,
|
||||
// adding wake-up latency to the next touch; disabled since exit_sleep() isn't implemented
|
||||
// here (see README) so there'd be no way back out once it kicked in.
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||||
uint8_t dis_auto_sleep = 0xFF;
|
||||
if (i2c_controller_register8_set(parent, config->address, REG_DIS_AUTOSLEEP, dis_auto_sleep, TIMEOUT) != ERROR_NONE) {
|
||||
LOG_W(TAG, "Failed to disable auto-sleep (non-fatal)");
|
||||
}
|
||||
|
||||
device_set_driver_data(device, internal);
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
static error_t stop(Device* device) {
|
||||
auto* internal = static_cast<Cst816tInternal*>(device_get_driver_data(device));
|
||||
|
||||
if (internal->reset_descriptor != nullptr) {
|
||||
gpio_descriptor_release(internal->reset_descriptor);
|
||||
}
|
||||
|
||||
free(internal);
|
||||
device_set_driver_data(device, nullptr);
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
// endregion
|
||||
|
||||
// region PointerApi
|
||||
|
||||
static error_t cst816t_read_data(Device* device, TickType_t) {
|
||||
auto* internal = static_cast<Cst816tInternal*>(device_get_driver_data(device));
|
||||
const auto* config = GET_CONFIG(device);
|
||||
auto* parent = device_get_parent(device);
|
||||
|
||||
// Burst-reads gesture_id, finger_num and X/Y in one transaction, matching the reference
|
||||
// driver: the chip presents them as one contiguous 6-byte block starting at REG_GESTURE_ID.
|
||||
uint8_t data[6];
|
||||
error_t error = i2c_controller_read_register(parent, config->address, REG_GESTURE_ID, data, sizeof(data), TIMEOUT);
|
||||
if (error != ERROR_NONE) {
|
||||
return error;
|
||||
}
|
||||
|
||||
uint8_t finger_num = data[1];
|
||||
internal->touched = finger_num > 0;
|
||||
// Top nibble of the high byte is reserved/event-type; the coordinate itself is 12-bit.
|
||||
internal->x = static_cast<uint16_t>(((data[2] & 0x0F) << 8) | data[3]);
|
||||
internal->y = static_cast<uint16_t>(((data[4] & 0x0F) << 8) | data[5]);
|
||||
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
// Single-touch only - see README for why.
|
||||
static bool cst816t_get_touched_points(Device* device, uint16_t* x, uint16_t* y, uint16_t* strength, uint8_t* point_count, uint8_t max_point_count) {
|
||||
auto* internal = static_cast<Cst816tInternal*>(device_get_driver_data(device));
|
||||
const auto* config = GET_CONFIG(device);
|
||||
|
||||
if (!internal->touched || max_point_count == 0) {
|
||||
*point_count = 0;
|
||||
return false;
|
||||
}
|
||||
|
||||
// Order matches esp_lcd_touch's own software coordinate adjustment (mirror X, mirror Y,
|
||||
// then swap) so behavior lines up with the other touch modules in this codebase.
|
||||
uint16_t point_x = internal->x;
|
||||
uint16_t point_y = internal->y;
|
||||
if (internal->mirror_x) {
|
||||
point_x = config->x_max - point_x;
|
||||
}
|
||||
if (internal->mirror_y) {
|
||||
point_y = config->y_max - point_y;
|
||||
}
|
||||
if (internal->swap_xy) {
|
||||
uint16_t tmp = point_x;
|
||||
point_x = point_y;
|
||||
point_y = tmp;
|
||||
}
|
||||
|
||||
x[0] = point_x;
|
||||
y[0] = point_y;
|
||||
if (strength != nullptr) {
|
||||
strength[0] = 0;
|
||||
}
|
||||
*point_count = 1;
|
||||
return true;
|
||||
}
|
||||
|
||||
static error_t cst816t_set_swap_xy(Device* device, bool swap) {
|
||||
auto* internal = static_cast<Cst816tInternal*>(device_get_driver_data(device));
|
||||
internal->swap_xy = swap;
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
static error_t cst816t_get_swap_xy(Device* device, bool* swap) {
|
||||
auto* internal = static_cast<Cst816tInternal*>(device_get_driver_data(device));
|
||||
*swap = internal->swap_xy;
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
static error_t cst816t_set_mirror_x(Device* device, bool mirror) {
|
||||
auto* internal = static_cast<Cst816tInternal*>(device_get_driver_data(device));
|
||||
internal->mirror_x = mirror;
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
static error_t cst816t_get_mirror_x(Device* device, bool* mirror) {
|
||||
auto* internal = static_cast<Cst816tInternal*>(device_get_driver_data(device));
|
||||
*mirror = internal->mirror_x;
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
static error_t cst816t_set_mirror_y(Device* device, bool mirror) {
|
||||
auto* internal = static_cast<Cst816tInternal*>(device_get_driver_data(device));
|
||||
internal->mirror_y = mirror;
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
static error_t cst816t_get_mirror_y(Device* device, bool* mirror) {
|
||||
auto* internal = static_cast<Cst816tInternal*>(device_get_driver_data(device));
|
||||
*mirror = internal->mirror_y;
|
||||
return ERROR_NONE;
|
||||
}
|
||||
|
||||
// endregion
|
||||
|
||||
static const PointerApi cst816t_pointer_api = {
|
||||
// Unsupported (null per PointerApi's contract): the reference driver defines
|
||||
// REG_SLEEP_MODE (0xE5) but never writes it, and the datasheet says waking up needs a
|
||||
// hardware reset pulse rather than a register write.
|
||||
.enter_sleep = nullptr,
|
||||
.exit_sleep = nullptr,
|
||||
.read_data = cst816t_read_data,
|
||||
.get_touched_points = cst816t_get_touched_points,
|
||||
.set_swap_xy = cst816t_set_swap_xy,
|
||||
.get_swap_xy = cst816t_get_swap_xy,
|
||||
.set_mirror_x = cst816t_set_mirror_x,
|
||||
.get_mirror_x = cst816t_get_mirror_x,
|
||||
.set_mirror_y = cst816t_set_mirror_y,
|
||||
.get_mirror_y = cst816t_get_mirror_y,
|
||||
};
|
||||
|
||||
Driver cst816t_driver = {
|
||||
.name = "cst816t",
|
||||
.compatible = (const char*[]) { "hynitron,cst816t", nullptr },
|
||||
.start_device = start,
|
||||
.stop_device = stop,
|
||||
.api = &cst816t_pointer_api,
|
||||
.device_type = &POINTER_TYPE,
|
||||
.owner = &cst816t_module,
|
||||
.internal = nullptr
|
||||
};
|
||||
@@ -0,0 +1,26 @@
|
||||
// SPDX-License-Identifier: Apache-2.0
|
||||
#include <tactility/check.h>
|
||||
#include <tactility/driver.h>
|
||||
#include <tactility/module.h>
|
||||
|
||||
extern "C" {
|
||||
|
||||
extern Driver cst816t_driver;
|
||||
|
||||
static error_t start() {
|
||||
return driver_construct_add(&cst816t_driver);
|
||||
}
|
||||
|
||||
static error_t stop() {
|
||||
return driver_remove_destruct(&cst816t_driver);
|
||||
}
|
||||
|
||||
Module cst816t_module = {
|
||||
.name = "cst816t",
|
||||
.start = start,
|
||||
.stop = stop,
|
||||
.symbols = nullptr,
|
||||
.internal = nullptr
|
||||
};
|
||||
|
||||
} // extern "C"
|
||||
Reference in New Issue
Block a user