STM32F407+TIM+ADC+FFT+DAC+lVGL界面简易信号发生器加示波器源码

<h1 align="center"> LittlevGL - Open-source Embedded GUI Library</h1> <p align="center"> <a href="https://github.com/littlevgl/lvgl/blob/master/LICENCE.txt"><img src="https://img.shields.io/badge/licence-MIT-blue.svg"></a> <a href="https://github.com/littlevgl/lvgl/releases/tag/v6.0"><img src="https://img.shields.io/badge/version-6.0-blue.svg"></a> </p> <p align="center"> <img src="https://littlevgl.com/github/cover_ori_reduced_2.gif"> </p> <p align="center"> LittlevGL provides everything you need to create a Graphical User Interface (GUI) on embedded systems with easy-to-use graphical elements, beautiful visual effects and low memory footprint. </p> <h4 align="center"> <a href="https://littlevgl.com">Website </a> &middot; <a href="https://littlevgl.com/live-demo">Live demo</a> &middot; <a href="https://docs.littlevgl.com/en/html/get-started/pc-simulator.html">Simulator</a> &middot; <a href="https://forum.littlevgl.com">Forum</a> &middot; <a href="https://docs.littlevgl.com/">Docs</a> &middot; <a href="https://blog.littlevgl.com/">Blog</a> </h4> --- - [Features](#features) - [Supported devices](#supported-devices) - [Quick start in a simulator](#quick-start-in-a-simulator) - [Add LittlevGL to your project](#add-littlevgl-to-your-project) - [Learn the basics](#learn-the-basics) - [Examples](#examples) - [Contributing](#contributing) - [Donate](#donate) ## Features * **Powerful building blocks** buttons, charts, lists, sliders, images, etc. * **Advanced graphics** with animations, anti-aliasing, opacity, smooth scrolling * **Simultaneously use various input devices** touchscreen, mouse, keyboard, encoder, buttons, etc. * **Simultaneously use multiple displays** i.e. monochrome and color display * **Multi-language support** with UTF-8 encoding * **Fully customizable** graphical elements * **Hardware independent** to use with any microcontroller or display * **Scalable** to operate with little memory (64 kB Flash, 10 kB RAM) * **OS, External memory and GPU** supported but not required * **Single frame buffer** operation even with advances graphical effects * **Written in C** for maximal compatibility * **Micropython Binding** exposes [LittlevGL API in Micropython](https://blog.littlevgl.com/2019-02-20/micropython-bindings) * **Simulator** to develop on PC without embedded hardware * **Tutorials, examples, themes** for rapid development * **Documentation** and API references ## Supported devices Basically, every modern controller - which is able to drive a display - is suitable to run LittlevGL. The minimal requirements: - 16, 32 or 64 bit microcontroller or processor - &gt; 16 MHz clock speed is recommended - Flash/ROM: &gt; 64 kB for the very essential components (&gt; 180 kB is recommended) - RAM: - Static RAM usage: ~8..16 kB depending on the used features and objects types - Stack: &gt; 2kB (&gt; 4 kB is recommended) - Dynamic data (heap): &gt; 4 KB (&gt; 16 kB is recommended if using several objects). Set by `LV_MEM_SIZE` in *lv_conf.h*. - Display buffer: &gt; *"Horizontal resolution"* pixels (&gt; 10 &times; *"Horizontal resolution"* is recommended) - C99 or newer compiler *Note that the memory usage might vary depending on the architecture, compiler and build options.* Just to mention some **platforms**: - STM32F1, STM32F3, [STM32F4](https://blog.littlevgl.com/2017-07-15/stm32f429_disco_port), [STM32F7](https://github.com/littlevgl/stm32f746_disco_no_os_sw4stm32) - Microchip dsPIC33, PIC24, PIC32MX, PIC32MZ - NXP Kinetis, LPC, iMX - [Linux frame buffer](https://blog.littlevgl.com/2018-01-03/linux_fb) (/dev/fb) - [Raspberry PI](http://www.vk3erw.com/index.php/16-software/63-raspberry-pi-official-7-touchscreen-and-littlevgl) - [Espressif ESP32](https://github.com/littlevgl/esp32_ili9431) - Nordic nrf52 - Quectell M66 ## Quick start in a simulator The easiest way to get started with LittlevGL is to run it in a simulator on your PC without any embedded hardware. Choose a project with your favourite IDE: | Eclipse | CodeBlocks | Visual Studio | PlatformIO | Qt Creator | |-------------|-------------|---------------|-----------|------------| | [](https://github.com/littlevgl/pc_simulator_sdl_eclipse) | [](https://github.com/littlevgl/pc_simulator_win_codeblocks) | [](https://github.com/littlevgl/visual_studio_2017_sdl_x64) | [](https://github.com/littlevgl/pc_simulator_sdl_platformio) | [](https://blog.littlevgl.com/2019-01-03/qt-creator) | | Cross-platform<br>with SDL | Native Windows | Cross-platform<br>with SDL | Cross-platform<br>with SDL | Cross-platform<br>with SDL | ## Add LittlevGL to your project The steps below show how to setup LittlevGL on an embedded system with a display and a touchpad. You can use the [Simulators](https://docs.littlevgl.com/en/html/get-started/pc-simulator) to get ready to use projects which can be run on your PC. 1. [Download](https://littlevgl.com/download) or [Clone](https://github.com/littlevgl/lvgl) the library 2. Copy the `lvgl` folder into your project 3. Copy `lvgl/lv_conf_template.h` as `lv_conf.h` next to the `lvgl` folder and set at least `LV_HOR_RES_MAX`, `LV_VER_RES_MAX` and `LV_COLOR_DEPTH`. 4. Include `lvgl/lvgl.h` where you need to use LittlevGL related functions. 5. Call `lv_tick_inc(x)` every `x` milliseconds **in a Timer or Task** (`x` should be between 1 and 10). It is required for the internal timing of LittlevGL. 6. Call `lv_init()` 7. Create a display buffer for LittlevGL ```c static lv_disp_buf_t disp_buf; static lv_color_t buf[LV_HOR_RES_MAX * 10]; /*Declare a buffer for 10 lines*/ lv_disp_buf_init(&disp_buf, buf, NULL, LV_HOR_RES_MAX * 10); /*Initialize the display buffer*/ ``` 8. Implement and register a function which can **copy a pixel array** to an area of your display: ```c lv_disp_drv_t disp_drv; /*Descriptor of a display driver*/ lv_disp_drv_init(&disp_drv); /*Basic initialization*/ disp_drv.flush_cb = my_disp_flush; /*Set your driver function*/ disp_drv.buffer = &disp_buf; /*Assign the buffer to the display*/ lv_disp_drv_register(&disp_drv); /*Finally register the driver*/ void my_disp_flush(lv_disp_t * disp, const lv_area_t * area, lv_color_t * color_p) { int32_t x, y; for(y = area->y1; y <= area->y2; y++) { for(x = area->x1; x <= area->x2; x++) { set_pixel(x, y, *color_p); /* Put a pixel to the display.*/ color_p++; } } lv_disp_flush_ready(disp); /* Indicate you are ready with the flushing*/ } ``` 9. Implement and register a function which can **read an input device**. E.g. for a touch pad: ```c lv_indev_drv_init(&indev_drv); /*Descriptor of a input device driver*/ indev_drv.type = LV_INDEV_TYPE_POINTER; /*Touch pad is a pointer-like device*/ indev_drv.read_cb = my_touchpad_read; /*Set your driver function*/ lv_indev_drv_register(&indev_drv); /*Finally register the driver*/ bool my_touchpad_read(lv_indev_drv_t * indev_driver, lv_indev_data_t * data) { static lv_coord_t last_x = 0; static lv_coord_t last_y = 0; /*Save the state and save the pressed coordinate*/ data->state = touchpad_is_pressed() ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL; if(data->state == LV_INDEV_STATE_PR) touchpad_get_xy(&last_x, &last_y); /*Set the coordinates (if released use the last pressed coordinates)*/ data->point.x = last_x; data->point.y = last_y; return false; /*Return `false` because we are not buffering and no more data to read*/ } ``` 10. Call `lv_task_handler()` periodically every few milliseconds in the main `while(1)` loop, in Timer interrupt or in an Ope