分享 C++ GUI Qt4 编程.第二版,example程序源码,带工程文件

关于Qt的各个版本

Qt4.8.7 是Qt4的最后一个版本,所以说4版本的坑基本都被填完了,另外Qt4也是很多嵌入式软件的运行环境,为了兼容Qt4,这个版本是最好的。
Qt5.7.0 最后的支持XP的版本。

 没有最好,只有适合

Demo 目录:

需要对应原书下载的,欢迎私信

### DS18B20 Sensor Simulation on STM32 Tutorial For simulating the DS18B20 temperature sensor with an STM32 microcontroller, such as the STM32F103C8T6, one can follow a structured approach to understand and implement this functionality. The process involves configuring the hardware connections between the STM32 and the DS18B20 sensor along with writing software code that interfaces these components effectively. #### Hardware Configuration The DS18B20 is a digital thermometer providing 9-bit to 12-bit Celsius temperature measurements. Connecting it to the STM32 requires wiring three pins: VCC (power), GND (ground), and DQ (data). A pull-up resistor should be connected between the data line and power supply because the communication protocol used by DS18B20 relies on open-drain outputs which require external pull-ups for proper operation[^1]. ```c // Example of initializing GPIO pin for DS18B20 Data Line in HAL library. GPIO_InitTypeDef GPIO_InitStruct = {0}; __HAL_RCC_GPIOA_CLK_ENABLE(); // Enable clock control for Port A GPIO_InitStruct.Pin = GPIO_PIN_4; // Selecting Pin PA4 for example purposes GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); ``` #### Software Implementation To simulate or emulate the behavior of the DS18B20 without having physical access to the device during development phases, developers often use predefined datasets representing typical output values from actual sensors under various conditions. This method allows testing algorithms responsible for processing raw readings into meaningful information like displaying temperatures on LCD screens. In terms of coding practices when working specifically within embedded systems environments using C/C++ languages alongside libraries provided by STMicroelectronics: - Utilize functions offered through OneWire API available either natively supported inside some versions of CubeMX-generated projects targeting specific families including F1 series where applicable or via third-party implementations compatible across different platforms. Below demonstrates how to initialize the One-Wire bus interface necessary before any read/write operations occur over the single-wire connection established earlier between MCU and peripheral devices sharing same medium. ```c #include "onewire.h" OneWire ds(PA_4); // Initialize OneWire object associated with previously configured port/pin combination void setup(void){ ... } ``` After setting up communications properly according to manufacturer guidelines found elsewhere documented online resources related directly towards interfacing particular models together successfully then proceed onto crafting routines capable enough at fetching current ambient air surrounding environment's thermal state periodically while ensuring accuracy remains consistent throughout entire application lifecycle span. --related questions-- 1. What are common challenges encountered when integrating DS18B20 sensors with STM32 controllers? 2. How does changing the resolution affect measurement precision in DS18B20 sensors? 3. Can you provide examples of applications benefiting most significantly from utilizing DS18B20 alongside STM32 boards? 4. Are there alternative methods besides direct hardware attachment for connecting DS18B20s to STM32 units remotely?
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