{"id":75383,"date":"2026-02-12T08:06:39","date_gmt":"2026-02-12T00:06:39","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/75383.html"},"modified":"2026-02-12T08:06:39","modified_gmt":"2026-02-12T00:06:39","slug":"stm32%e8%9c%82%e9%b8%a3%e5%99%a8%e4%b8%8eled%e5%a3%b0%e5%85%89%e6%8a%a5%e8%ad%a6%e7%b3%bb%e7%bb%9f%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/75383.html","title":{"rendered":"STM32\u8702\u9e23\u5668\u4e0eLED\u58f0\u5149\u62a5\u8b66\u7cfb\u7edf\u5b9e\u73b0"},"content":{"rendered":"

\n 1. \u8702\u9e23\u5668\u4e0eLED\u62a5\u8b66\u7cfb\u7edf\u5de5\u7a0b\u5b9e\u73b0
\n<\/h3>\n

\n \u5728\u667a\u80fd\u5bb6\u5c45\u7ec8\u7aef\u8bbe\u5907\u4e2d，\u58f0\u5149\u62a5\u8b66\u662f\u73af\u5883\u5f02\u5e38\u72b6\u6001\u6700\u76f4\u63a5\u3001\u6700\u53ef\u9760\u7684\u672c\u5730\u5316\u53cd\u9988\u673a\u5236\u3002\u672c\u8282\u5c06\u57fa\u4e8eSTM32F103C8T6\u6700\u5c0f\u7cfb\u7edf，\u7ed3\u5408\u539f\u7406\u56fe\u786c\u4ef6\u8bbe\u8ba1，\u5b8c\u6210\u8702\u9e23\u5668\u9a71\u52a8\u3001\u53cc\u8272LED\u72b6\u6001\u6307\u793a\u3001\u591a\u6761\u4ef6\u590d\u5408\u62a5\u8b66\u903b\u8f91\u53ca\u5b9a\u65f6\u5668\u9a71\u52a8\u7684PWM\u5f0f\u62a5\u8b66\u63a7\u5236\u3002\u6574\u4e2a\u5b9e\u73b0\u4e0d\u4f9d\u8d56\u4efb\u4f55\u7b2c\u4e09\u65b9GUI\u5e93\u6216\u4e0a\u5c42\u6846\u67b6，\u5168\u90e8\u91c7\u7528HAL\u5e93\u5e95\u5c42API\u6784\u5efa，\u786e\u4fdd\u4ee3\u7801\u53ef\u79fb\u690d\u6027\u4e0e\u5de5\u7a0b\u53ef\u63a7\u6027\u3002\n<\/p>\n

\n 1.1 \u786c\u4ef6\u8fde\u63a5\u4e0e\u5f15\u811a\u786e\u8ba4
\n<\/h4>\n

\n \u6839\u636e\u539f\u7406\u56fe\u6807\u6ce8，\u8702\u9e23\u5668（Buzzer）\u9a71\u52a8\u7535\u8def\u91c7\u7528NPN\u4e09\u6781\u7ba1（\u5982S8050）\u6784\u6210\u7684\u53cd\u76f8\u5f00\u5173\u7ed3\u6784，\u5176\u57fa\u6781\u76f4\u63a5\u8fde\u63a5\u81f3MCU\u7684GPIOA_Pin0\u5f15\u811a\u3002\u8be5\u8bbe\u8ba1\u610f\u5473\u7740：\u5f53PA0\u8f93\u51fa\u9ad8\u7535\u5e73\u65f6，\u4e09\u6781\u7ba1\u5bfc\u901a，\u8702\u9e23\u5668\u5f97\u7535\u53d1\u58f0；\u5f53PA0\u8f93\u51fa\u4f4e\u7535\u5e73\u65f6，\u4e09\u6781\u7ba1\u622a\u6b62，\u8702\u9e23\u5668\u65ad\u7535\u9759\u97f3\u3002\u6b64\u4e3a\u5178\u578b\u7684\u201c\u9ad8\u7535\u5e73\u6709\u6548\u201d\u9a71\u52a8\u65b9\u5f0f\u3002\n<\/p>\n

\n \u540c\u65f6，\u7cfb\u7edf\u914d\u5907\u4e24\u9897\u72ec\u7acbLED：<\/p>\n

–<\/p>\n

PC13\u5f15\u811a\u8fde\u63a5\u7eff\u8272LED<\/p>\n

：\u7528\u4e8e\u6a21\u62df\u62a5\u8b66\u89e6\u53d1\u72b6\u6001\u6307\u793a；<\/p>\n

–<\/p>\n

PA1\u5f15\u811a\u8fde\u63a5\u7ea2\u8272LED<\/p>\n

：\u7528\u4e8e\u624b\u52a8\u5f00\u5173\u63a7\u5236\u72b6\u6001\u6307\u793a（\u540e\u7eed\u6269\u5c55\u4e3a\u7528\u6237\u64cd\u4f5c\u53cd\u9988\u706f）\u3002\n<\/p>\n

\n \u8be5\u786c\u4ef6\u5e03\u5c40\u5df2\u5728PCB\u5e03\u7ebf\u4e2d\u56fa\u5316，\u65e0\u9700\u8df3\u7ebf\u8c03\u6574\u3002\u9700\u7279\u522b\u6ce8\u610f：PA0\u4e0ePC13\u5747\u5c5e\u4e8e\u4e0d\u540cGPIO\u7aef\u53e3，\u4e14PC13\u4f4d\u4e8eC\u7aef\u53e3\u672b\u5c3e，\u65f6\u949f\u4f7f\u80fd\u987a\u5e8f\u4e0e\u5bc4\u5b58\u5668\u5730\u5740\u504f\u79fb\u5747\u9700\u4e25\u683c\u5bf9\u5e94，\u4e0d\u53ef\u6df7\u6dc6\u3002\n<\/p>\n

\n 1.2 GPIO\u521d\u59cb\u5316\u914d\u7f6e
\n<\/h4>\n

\n \u5728<\/p>\n

MX_GPIO_Init()<\/p>\n

\u51fd\u6570\u4e2d\u5b8c\u6210\u5168\u90e8I\/O\u521d\u59cb\u5316\u3002\u5173\u952e\u914d\u7f6e\u9879\u5982\u4e0b：\n<\/p>\n

\/\/ \u542f\u7528GPIOA\u4e0eGPIOC\u65f6\u949f
\n__HAL_RCC_GPIOA_CLK_ENABLE();
\n__HAL_RCC_GPIOC_CLK_ENABLE();<\/p>\n

\/\/ \u914d\u7f6ePA0\u4e3a\u63a8\u633d\u8f93\u51fa，\u65e0\u4e0a\u62c9\u4e0b\u62c9，\u9ad8\u901f\u6a21\u5f0f（10MHz）
\nGPIO_InitTypeDef GPIO_InitStruct = {0};
\nGPIO_InitStruct.Pin = GPIO_PIN_0;
\nGPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
\nGPIO_InitStruct.Pull = GPIO_NOPULL;
\nGPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
\nHAL_GPIO_Init(GPIOA, &GPIO_InitStruct);<\/p>\n

\/\/ \u914d\u7f6ePC13\u4e3a\u63a8\u633d\u8f93\u51fa，\u65e0\u4e0a\u4e0b\u62c9，\u4e2d\u901f\u6a21\u5f0f（2MHz）
\nGPIO_InitStruct.Pin = GPIO_PIN_13;
\nGPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM;
\nHAL_GPIO_Init(GPIOC, &GPIO_InitStruct);<\/p>\n

\/\/ \u914d\u7f6ePA1\u4e3a\u63a8\u633d\u8f93\u51fa（\u7ea2\u706f），\u7528\u9014\u540e\u7eed\u6269\u5c55
\nGPIO_InitStruct.Pin = GPIO_PIN_1;
\nHAL_GPIO_Init(GPIOA, &GPIO_InitStruct);<\/p>\n

\n \u6b64\u5904\u901f\u5ea6\u914d\u7f6e\u5e76\u975e\u968f\u610f\u9009\u62e9：PA0\u9a71\u52a8\u8702\u9e23\u5668\u9700\u4e00\u5b9a\u9a71\u52a8\u80fd\u529b，\u9009\u7528<\/p>\n

GPIO_SPEED_FREQ_HIGH<\/p>\n

\u786e\u4fdd\u4e0a\u5347\/\u4e0b\u964d\u6cbf\u8db3\u591f\u9661\u5ced，\u907f\u514d\u56e0\u8fb9\u6cbf\u7f13\u6162\u5bfc\u81f4\u8702\u9e23\u5668\u8bef\u89e6\u53d1\u6216\u58f0\u97f3\u5931\u771f；\u800cPC13\u4ec5\u4f5c\u72b6\u6001\u6307\u793a，<\/p>\n

GPIO_SPEED_FREQ_MEDIUM<\/p>\n

\u5df2\u5b8c\u5168\u6ee1\u8db3，\u4e14\u53ef\u964d\u4f4e\u9ad8\u9891\u566a\u58f0\u8f90\u5c04\u3002\n<\/p>\n

\n \u6240\u6709\u5f15\u811a\u521d\u59cb\u7535\u5e73\u7edf\u4e00\u8bbe\u4e3a\u4f4e\u7535\u5e73（<\/p>\n

HAL_GPIO_WritePin(GPIOx, Pin, GPIO_PIN_RESET)<\/p>\n

），\u786e\u4fdd\u4e0a\u7535\u77ac\u95f4\u8702\u9e23\u5668\u4e0eLED\u5747\u5904\u4e8e\u5173\u95ed\u72b6\u6001，\u7b26\u5408\u5b89\u5168\u542f\u52a8\u89c4\u8303\u3002\n<\/p>\n

\n 1.3 \u4f4d\u5e26\u64cd\u4f5c\u5c01\u88c5\u4e0e\u5feb\u901fIO\u63a7\u5236
\n<\/h4>\n

\n \u4e3a\u63d0\u5347\u62a5\u8b66\u54cd\u5e94\u5b9e\u65f6\u6027\u5e76\u7b80\u5316\u4ee3\u7801\u53ef\u8bfb\u6027，\u5f15\u5165ARM Cortex-M3\u4f4d\u5e26（Bit-Band）\u673a\u5236\u3002\u8be5\u673a\u5236\u5141\u8bb8\u5bf9\u5355\u4e2aGPIO\u5f15\u811a\u8fdb\u884c\u539f\u5b50\u7ea7\u8bfb\u5199，\u65e0\u9700\u8bfb-\u6539-\u5199\u64cd\u4f5c，\u5f7b\u5e95\u89c4\u907f\u591a\u4efb\u52a1\u73af\u5883\u4e0bIO\u7ade\u4e89\u98ce\u9669\u3002\n<\/p>\n

\n \u5728<\/p>\n

bitband.h<\/p>\n

\u4e2d\u5b9a\u4e49\u6807\u51c6\u4f4d\u5e26\u5b8f：\n<\/p>\n

#define BITBAND_PERIPH_BASE 0x40000000U
\n#define BITBAND_SRAM_BASE 0x20000000U
\n#define PERIPH_BB_BASE (BITBAND_PERIPH_BASE + 0x02000000U)
\n#define SRAM_BB_BASE (BITBAND_SRAM_BASE + 0x01000000U)<\/p>\n

#define BITBAND_PERIPH(addr, bitnum) \\\\
\n ((uint32_t)(PERIPH_BB_BASE + (((uint32_t)(addr) – BITBAND_PERIPH_BASE) << 5) + ((bitnum) << 2)))
\n#define BITBAND_SRAM(addr, bitnum) \\\\
\n ((uint32_t)(SRAM_BB_BASE + (((uint32_t)(addr) – BITBAND_SRAM_BASE) << 5) + ((bitnum) << 2)))<\/p>\n

#define MEM_ADDR_TO_BITBAND_PERIPH(addr, bitnum) \\\\
\n *(volatile uint32_t*)BITBAND_PERIPH((addr), (bitnum))
\n#define MEM_ADDR_TO_BITBAND_SRAM(addr, bitnum) \\\\
\n *(volatile uint32_t*)BITBAND_SRAM((addr), (bitnum))<\/p>\n

\/\/ \u5feb\u901f\u8bbe\u7f6ePA0（\u8702\u9e23\u5668）
\n#define BUZZER_ON() MEM_ADDR_TO_BITBAND_PERIPH(&GPIOA->ODR, 0) = 1
\n#define BUZZER_OFF() MEM_ADDR_TO_BITBAND_PERIPH(&GPIOA->ODR, 0) = 0<\/p>\n

\/\/ \u5feb\u901f\u8bbe\u7f6ePC13（\u7eff\u706f）
\n#define LED_GREEN_ON() MEM_ADDR_TO_BITBAND_PERIPH(&GPIOC->ODR, 13) = 1
\n#define LED_GREEN_OFF() MEM_ADDR_TO_BITBAND_PERIPH(&GPIOC->ODR, 13) = 0<\/p>\n

\/\/ \u5feb\u901f\u8bbe\u7f6ePA1（\u7ea2\u706f）
\n#define LED_RED_ON() MEM_ADDR_TO_BITBAND_PERIPH(&GPIOA->ODR, 1) = 1
\n#define LED_RED_OFF() MEM_ADDR_TO_BITBAND_PERIPH(&GPIOA->ODR, 1) = 0<\/p>\n

\n \u8be5\u5c01\u88c5\u5c06<\/p>\n

GPIOx->ODR<\/p>\n

\u5bc4\u5b58\u5668\u7684\u67d0\u4e00\u4f4d\u6620\u5c04\u4e3a\u72ec\u7acb\u53ef\u5bfb\u5740\u768432\u4f4d\u5b57，\u901a\u8fc7\u4e00\u6b21\u5199\u64cd\u4f5c\u5373\u53ef\u5b8c\u6210\u5f15\u811a\u7535\u5e73\u5207\u6362，\u6267\u884c\u5468\u671f\u6052\u4e3a1\u4e2a\u7cfb\u7edf\u65f6\u949f\u5468\u671f，\u8fdc\u4f18\u4e8e<\/p>\n

HAL_GPIO_WritePin()<\/p>\n

\u51fd\u6570\u8c03\u7528\u5f00\u9500（\u7ea6\u6570\u5341\u4e2a\u5468\u671f）\u3002\u5728\u62a5\u8b66\u903b\u8f91\u9ad8\u9891\u7ffb\u8f6c\u573a\u666f\u4e0b，\u6b64\u4f18\u5316\u53ef\u663e\u8457\u63d0\u5347\u7cfb\u7edf\u786e\u5b9a\u6027\u3002\n<\/p>\n

\n 1.4 \u5b9a\u65f6\u5668\u9a71\u52a8\u7684\u8702\u9e23\u5668PWM\u63a7\u5236
\n<\/h4>\n

\n \u8702\u9e23\u5668\u6301\u7eed\u53d1\u58f0\u6613\u5f15\u53d1\u542c\u89c9\u75b2\u52b3\u4e14\u529f\u8017\u8f83\u9ad8，\u5de5\u4e1a\u7ea7\u8bbe\u8ba1\u8981\u6c42\u91c7\u7528\u8109\u51b2\u9a71\u52a8\u65b9\u5f0f\u3002\u672c\u65b9\u6848\u9009\u7528TIM3\u5b9a\u65f6\u5668\u5de5\u4f5c\u4e8e\u66f4\u65b0\u4e2d\u65ad\u6a21\u5f0f，\u4ea7\u751f299Hz\u65b9\u6ce2\u4fe1\u53f7\u63a7\u5236\u8702\u9e23\u5668，\u517c\u987e\u4eba\u8033\u654f\u611f\u9891\u6bb5（20Hz\u201320kHz）\u4e0eMCU\u8d44\u6e90\u5360\u7528\u7387\u3002\n<\/p>\n

\n 1.4.1 TIM3\u65f6\u949f\u6811\u914d\u7f6e\u5206\u6790
\n<\/h5>\n

\n STM32F103C8T6\u9ed8\u8ba4HSE=8MHz，\u7ecfPLL\u500d\u9891\u540e\u7cfb\u7edf\u65f6\u949fSYSCLK=72MHz\u3002APB1\u603b\u7ebf（TIM3\u6302\u8f7d\u4e8e\u6b64）\u6700\u9ad8\u652f\u630136MHz，\u5b9e\u9645\u914d\u7f6e\u4e3a36MHz\u3002TIM3\u65f6\u949f\u6e90\u5373\u4e3aAPB1\u65f6\u949f，\u6545\u5176\u8ba1\u6570\u5668\u65f6\u949f\u9891\u7387\u4e3a36MHz\u3002\n<\/p>\n

\n \u76ee\u6807\u9891\u7387299Hz，\u8ba1\u7b97\u5206\u9891\u7cfb\u6570\u4e0e\u81ea\u52a8\u91cd\u88c5\u8f7d\u503c：<\/p>\n

– \u8ba1\u6570\u5668\u65f6\u949f\u9891\u7387<\/p>\n

CK_CNT = 36,000,000 Hz<\/p>\n

– \u76ee\u6807PWM\u5468\u671f<\/p>\n

T_PWM = 1 \/ 299 \u2248 0.003344 s = 3344 \u00b5s<\/p>\n

– \u8ba1\u6570\u5668\u5468\u671f<\/p>\n

ARR + 1 = CK_CNT \u00d7 T_PWM = 36,000,000 \u00d7 0.003344 \u2248 120,384<\/p>\n

\n \u53d6\u6574\u540e\u8bbe<\/p>\n

ARR = 120383<\/p>\n

，\u6b64\u65f6\u5b9e\u9645\u9891\u7387\u4e3a：<\/p>\n

f_actual = 36,000,000 \/ (120383 + 1) \u2248 299.0008 Hz<\/p>\n

\n \u8be5\u8bef\u5dee\u5c0f\u4e8e0.01%，\u5b8c\u5168\u6ee1\u8db3\u58f0\u5b66\u62a5\u8b66\u8981\u6c42\u3002\n<\/p>\n

\n 1.4.2 TIM3\u521d\u59cb\u5316\u4ee3\u7801
\n<\/h5>\n

\n \u5728<\/p>\n

MX_TIM3_Init()<\/p>\n

\u4e2d\u914d\u7f6e：\n<\/p>\n

TIM_HandleTypeDef htim3;<\/p>\n

void MX_TIM3_Init(void)
\n{
\n htim3.Instance = TIM3;
\n htim3.Init.Prescaler = 0; \/\/ \u4e0d\u9884\u5206\u9891，CK_CNT = 36MHz
\n htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
\n htim3.Init.Period = 120383; \/\/ \u81ea\u52a8\u91cd\u88c5\u8f7d\u503c
\n htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
\n htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
\n if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
\n {
\n Error_Handler();
\n }<\/p>\n

\/\/ \u4f7f\u80fdTIM3\u66f4\u65b0\u4e2d\u65ad
\n HAL_NVIC_SetPriority(TIM3_IRQn, 5, 0);
\n HAL_NVIC_EnableIRQ(TIM3_IRQn);
\n}<\/p>\n

\n \u6ce8\u610f\u4e2d\u65ad\u4f18\u5148\u7ea7\u8bbe\u4e3a5：\u4f4e\u4e8eSysTick（\u9ed8\u8ba4\u4e3a0）\u548c\u4e32\u53e3\u4e2d\u65ad（\u901a\u5e38\u4e3a2~3），\u786e\u4fdd\u4f20\u611f\u5668\u6570\u636e\u91c7\u96c6\u4e0e\u901a\u4fe1\u4e0d\u88ab\u62a5\u8b66\u4e2d\u65ad\u963b\u585e；\u4f46\u9ad8\u4e8e\u666e\u901a\u4efb\u52a1\u8c03\u5ea6（\u5982FreeRTOS PendSV\u4e3a15），\u4fdd\u969c\u62a5\u8b66\u54cd\u5e94\u53ca\u65f6\u6027\u3002\n<\/p>\n

\n 1.4.3 \u4e2d\u65ad\u670d\u52a1\u51fd\u6570\u5b9e\u73b0
\n<\/h5>\n

TIM3_IRQHandler<\/p>\n

\u4e2d\u4ec5\u6267\u884c\u6700\u7b80\u903b\u8f91：\n<\/p>\n

extern uint8_t alarm_flag;<\/p>\n

void TIM3_IRQHandler(void)
\n{
\n HAL_TIM_IRQHandler(&htim3);
\n}<\/p>\n

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
\n{
\n if (htim->Instance == TIM3)
\n {
\n if (alarm_flag)
\n {
\n \/\/ \u62a5\u8b66\u4f7f\u80fd\u65f6，\u7ffb\u8f6c\u8702\u9e23\u5668\u4e0e\u7eff\u706f
\n BUZZER_ON(); \/\/ PA0\u7f6e\u9ad8
\n LED_GREEN_ON(); \/\/ PC13\u7f6e\u9ad8
\n }
\n else
\n {
\n BUZZER_OFF(); \/\/ PA0\u7f6e\u4f4e
\n LED_GREEN_OFF(); \/\/ PC13\u7f6e\u4f4e
\n }
\n }
\n}<\/p>\n

\n \u6b64\u5904\u5173\u952e\u70b9\u5728\u4e8e：\u4e2d\u65ad\u56de\u8c03\u4e2d<\/p>\n

\u4e0d\u6267\u884c\u4efb\u4f55\u5ef6\u65f6\u3001\u6d6e\u70b9\u8fd0\u7b97\u6216\u590d\u6742\u5224\u65ad<\/p>\n

，\u4ec5\u505aIO\u7535\u5e73\u5207\u6362\u3002\u6240\u6709\u62a5\u8b66\u6761\u4ef6\u5224\u65ad\u5747\u5728\u4e3b\u5faa\u73af\u4e2d\u5b8c\u6210，\u7531<\/p>\n

alarm_flag<\/p>\n

\u53d8\u91cf\u4f5c\u4e3a\u552f\u4e00\u540c\u6b65\u4fe1\u53f7\u3002\u8fd9\u79cd\u8bbe\u8ba1\u4e25\u683c\u9075\u5faa\u5b9e\u65f6\u7cfb\u7edf\u201c\u4e2d\u65ad\u5feb\u8fdb\u5feb\u51fa\u201d\u539f\u5219，\u5c06\u8017\u65f6\u903b\u8f91\u79fb\u81f3\u4e3b\u4e0a\u4e0b\u6587，\u907f\u514d\u4e2d\u65ad\u5d4c\u5957\u98ce\u9669\u3002\n<\/p>\n

\n 1.5 \u591a\u4f20\u611f\u5668\u9608\u503c\u62a5\u8b66\u903b\u8f91\u5efa\u6a21
\n<\/h4>\n

\n \u62a5\u8b66\u51b3\u7b56\u57fa\u4e8e\u4e09\u7c7b\u73af\u5883\u53c2\u6570\u5b9e\u65f6\u503c：<\/p>\n

– \u6e29\u5ea6（\u2103）：\u6765\u81eaDS18B20\u6216DHT22\u7b49\u4f20\u611f\u5668，\u53d6\u6574\u6570\u90e8\u5206；<\/p>\n

– \u6e7f\u5ea6（%RH）：\u540c\u4e0a，\u53d6\u6574\u6570\u503c；<\/p>\n

– \u5149\u7167\u5f3a\u5ea6（lux）：\u6765\u81eaBH1750\u6216\u7c7b\u4f3cI\u00b2C\u4f20\u611f\u5668，\u5355\u4f4d\u4e3a\u6574\u6570lux\u503c\u3002\n<\/p>\n

\n \u8bbe\u5b9a\u62a5\u8b66\u89e6\u53d1\u6761\u4ef6\u4e3a\u4e09\u8005<\/p>\n

\u4efb\u4e00<\/p>\n

\u8d85\u8fc7\u9608\u503c：<\/p>\n

– \u6e29\u5ea6 > 30\u2103<\/p>\n

– \u6e7f\u5ea6 > 80%RH<\/p>\n

– \u5149\u7167 > 10000 lux\n<\/p>\n

\n \u6b64\u4e3a\u5178\u578b\u7684\u201c\u6216\u903b\u8f91\u201d（OR Logic），\u6570\u5b66\u8868\u8fbe\u4e3a：<\/p>\n

Alarm = (Temp > 30) \u2228 (Humidity > 80) \u2228 (Light > 10000)<\/p>\n

\n 1.5.1 \u5e03\u5c14\u4ee3\u6570\u4f18\u5316\u4e0e\u4ee3\u7801\u5b9e\u73b0
\n<\/h5>\n

\n \u82e5\u6309\u76f4\u89c9\u7f16\u5199\u4e09\u5c42\u5d4c\u5957if\u8bed\u53e5，\u4e0d\u4ec5\u5197\u4f59\u4e14\u6613\u6f0f\u5224\u3002\u66f4\u4f18\u89e3\u662f\u5229\u7528\u5fb7\u00b7\u6469\u6839\u5b9a\u5f8b（De Morgan\u2019s Law）\u8f6c\u6362\u4e3a\u201c\u5168\u4e0d\u6ee1\u8db3\u5219\u4e0d\u62a5\u8b66\u201d，\u5373：\n<\/p>\n

!Alarm = (Temp \u2264 30) \u2227 (Humidity \u2264 80) \u2227 (Light \u2264 10000)<\/p>\n

\u21d2 Alarm = ![(Temp \u2264 30) \u2227 (Humidity \u2264 80) \u2227 (Light \u2264 10000)]<\/p>\n

\n \u6b64\u5f62\u5f0f\u4ec5\u9700\u4e00\u6b21\u903b\u8f91\u975e\u8fd0\u7b97，\u4e14\u6761\u4ef6\u5224\u65ad\u5929\u7136\u77ed\u8def，\u6548\u7387\u66f4\u9ad8\u3002\u5bf9\u5e94C\u4ee3\u7801：\n<\/p>\n

uint8_t alarm_flag = 0;<\/p>\n

\/\/ \u5728\u4e3b\u5faa\u73af\u4e2d\u5468\u671f\u6027\u6267\u884c（\u5982\u6bcf500ms）
\nvoid check_alarm_conditions(void)
\n{
\n int16_t temp = get_temperature(); \/\/ \u83b7\u53d6\u6e29\u5ea6\u6574\u6570\u503c
\n uint16_t humi = get_humidity(); \/\/ \u83b7\u53d6\u6e7f\u5ea6\u6574\u6570\u503c
\n uint32_t light = get_light_lux(); \/\/ \u83b7\u53d6\u5149\u7167\u6574\u6570\u503c<\/p>\n

\/\/ \u6240\u6709\u6761\u4ef6\u5747\u4e0d\u6ee1\u8db3\u65f6，alarm_flag = 0；\u5426\u5219 = 1
\n alarm_flag = !((temp <= 30) && (humi <= 80) && (light <= 10000));<\/p>\n

\/\/ \u540c\u6b65\u66f4\u65b0\u7ea2\u706f\u72b6\u6001：alarm_flag\u4e3a1\u65f6\u7ea2\u706f\u4eae（\u624b\u52a8\u5f00\u5173\u6307\u793a）
\n if (alarm_flag)
\n {
\n LED_RED_ON();
\n }
\n else
\n {
\n LED_RED_OFF();
\n }
\n}<\/p>\n

\n \u8be5\u5b9e\u73b0\u5177\u6709\u4ee5\u4e0b\u4f18\u52bf：<\/p>\n

–<\/p>\n

\u65e0\u5206\u652f\u9884\u6d4b\u5931\u8d25<\/p>\n

：\u73b0\u4ee3ARM\u5904\u7406\u5668\u5bf9<\/p>\n

&&<\/p>\n

\u77ed\u8def\u6c42\u503c\u4f18\u5316\u6781\u4f73，\u5f53<\/p>\n

temp <= 30<\/p>\n

\u4e3a\u5047\u65f6，\u540e\u7eed\u6761\u4ef6\u4e0d\u518d\u8ba1\u7b97；<\/p>\n

–<\/p>\n

\u5185\u5b58\u8bbf\u95ee\u5c40\u90e8\u6027\u597d<\/p>\n

：\u4e09\u4e2a\u53d8\u91cf\u5747\u4e3a\u6574\u578b，\u8fde\u7eed\u5b58\u50a8\u6216\u5bc4\u5b58\u5668\u5206\u914d，\u7f13\u5b58\u547d\u4e2d\u7387\u9ad8；<\/p>\n

–<\/p>\n

\u53ef\u6269\u5c55\u6027\u5f3a<\/p>\n

：\u65b0\u589e\u4f20\u611f\u5668\u6761\u4ef6\u53ea\u9700\u5728<\/p>\n

&&<\/p>\n

\u94fe\u4e2d\u8ffd\u52a0<\/p>\n

(new_sensor <= threshold)<\/p>\n

\u5373\u53ef\u3002\n<\/p>\n

\n 1.5.2 \u5b9e\u9645\u90e8\u7f72\u4e2d\u7684\u8fb9\u754c\u5904\u7406
\n<\/h5>\n

\n \u771f\u5b9e\u4f20\u611f\u5668\u6570\u636e\u5b58\u5728\u566a\u58f0\u4e0e\u6f02\u79fb，\u76f4\u63a5\u6bd4\u8f83\u539f\u59cb\u503c\u6613\u5bfc\u81f4\u8bef\u62a5\u3002\u5de5\u7a0b\u5b9e\u8df5\u4e2d\u5fc5\u987b\u52a0\u5165\u8f6f\u4ef6\u6ee4\u6ce2：\n<\/p>\n

#define TEMP_FILTER_DEPTH 5
\n#define HUMI_FILTER_DEPTH 5
\n#define LIGHT_FILTER_DEPTH 3<\/p>\n

int16_t temp_filter[TEMP_FILTER_DEPTH] = {0};
\nuint16_t humi_filter[HUMI_FILTER_DEPTH] = {0};
\nuint32_t light_filter[LIGHT_FILTER_DEPTH] = {0};
\nuint8_t filter_idx = 0;<\/p>\n

void update_sensor_filters(int16_t t, uint16_t h, uint32_t l)
\n{
\n temp_filter[filter_idx] = t;
\n humi_filter[filter_idx] = h;
\n light_filter[filter_idx] = l;<\/p>\n

filter_idx = (filter_idx + 1) % TEMP_FILTER_DEPTH;<\/p>\n

\/\/ \u4e2d\u503c\u6ee4\u6ce2：\u53d6\u6570\u7ec4\u6392\u5e8f\u540e\u4e2d\u95f4\u503c
\n int16_t temp_sorted[TEMP_FILTER_DEPTH];
\n memcpy(temp_sorted, temp_filter, sizeof(temp_filter));
\n qsort(temp_sorted, TEMP_FILTER_DEPTH, sizeof(int16_t), compare_int16);<\/p>\n

int16_t filtered_temp = temp_sorted[TEMP_FILTER_DEPTH\/2];
\n uint16_t filtered_humi = get_median_uint16(humi_filter, HUMI_FILTER_DEPTH);
\n uint32_t filtered_light = get_median_uint32(light_filter, LIGHT_FILTER_DEPTH);<\/p>\n

\/\/ \u4f7f\u7528\u6ee4\u6ce2\u540e\u503c\u53c2\u4e0e\u62a5\u8b66\u5224\u65ad
\n alarm_flag = !((filtered_temp <= 30) && (filtered_humi <= 80) && (filtered_light <= 10000));
\n}<\/p>\n

\n \u4e2d\u503c\u6ee4\u6ce2\u5bf9\u8109\u51b2\u566a\u58f0\u6291\u5236\u6548\u679c\u663e\u8457，\u4e14\u8ba1\u7b97\u590d\u6742\u5ea6\u8fdc\u4f4e\u4e8e\u5361\u5c14\u66fc\u6ee4\u6ce2，\u9002\u5408\u8d44\u6e90\u53d7\u9650\u7684Cortex-M3\u5e73\u53f0\u3002\n<\/p>\n

\n 1.6 \u7528\u6237\u4ea4\u4e92\u6309\u952e\u4e0e\u62a5\u8b66\u4f7f\u80fd\u63a7\u5236
\n<\/h4>\n

\n \u7cfb\u7edf\u9884\u7559\u4e00\u4e2a\u7269\u7406\u6309\u952e（\u5047\u8bbe\u8fde\u63a5\u81f3PB0），\u7528\u4e8e\u624b\u52a8\u542f\u505c\u62a5\u8b66\u529f\u80fd\u3002\u8be5\u6309\u952e\u9700\u5b9e\u73b0\u786c\u4ef6\u6d88\u6296\u4e0e\u72b6\u6001\u673a\u7ba1\u7406，\u907f\u514d\u673a\u68b0\u6296\u52a8\u5f15\u53d1\u591a\u6b21\u89e6\u53d1\u3002\n<\/p>\n

\n 1.6.1 \u6309\u952e\u72b6\u6001\u673a\u8bbe\u8ba1
\n<\/h5>\n

\n \u5b9a\u4e49\u4e09\u79cd\u7a33\u5b9a\u72b6\u6001：<\/p>\n

–<\/p>\n

KEY_IDLE<\/p>\n

：\u6309\u952e\u672a\u6309\u4e0b，\u7535\u5e73\u4e3a\u9ad8（\u4e0a\u62c9）<\/p>\n

–<\/p>\n

KEY_PRESSED<\/p>\n

：\u68c0\u6d4b\u5230\u4e0b\u964d\u6cbf，\u8fdb\u5165\u6d88\u6296\u8ba1\u65f6<\/p>\n

–<\/p>\n

KEY_RELEASED<\/p>\n

：\u68c0\u6d4b\u5230\u4e0a\u5347\u6cbf，\u786e\u8ba4\u91ca\u653e\n<\/p>\n

\n \u5728<\/p>\n

main.c<\/p>\n

\u4e2d\u6dfb\u52a0：\n<\/p>\n

typedef enum {
\n KEY_IDLE,
\n KEY_PRESSED,
\n KEY_RELEASED
\n} KeyState_t;<\/p>\n

static KeyState_t key_state = KEY_IDLE;
\nstatic uint32_t key_press_time = 0;<\/p>\n

void check_key_state(void)
\n{
\n static uint32_t last_tick = 0;
\n uint32_t current_tick = HAL_GetTick();<\/p>\n

\/\/ \u6bcf10ms\u626b\u63cf\u4e00\u6b21
\n if (current_tick – last_tick < 10) return;
\n last_tick = current_tick;<\/p>\n

switch (key_state)
\n {
\n case KEY_IDLE:
\n if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET) \/\/ \u6309\u4e0b
\n {
\n key_state = KEY_PRESSED;
\n key_press_time = current_tick;
\n }
\n break;<\/p>\n

case KEY_PRESSED:
\n if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_SET) \/\/ \u91ca\u653e
\n {
\n if (current_tick – key_press_time > 20) \/\/ \u6d88\u629620ms
\n {
\n key_state = KEY_RELEASED;
\n \/\/ \u6267\u884c\u62a5\u8b66\u4f7f\u80fd\u5207\u6362
\n alarm_flag = !alarm_flag;
\n \/\/ \u540c\u6b65\u66f4\u65b0\u7ea2\u706f：alarm_flag\u4e3a1\u65f6\u7ea2\u706f\u5e38\u4eae，\u4e3a0\u65f6\u706d
\n if (alarm_flag) LED_RED_ON();
\n else LED_RED_OFF();
\n }
\n }
\n else if (current_tick – key_press_time > 1000) \/\/ \u957f\u63091\u79d2\u8fdb\u5165\u914d\u7f6e\u6a21\u5f0f（\u9884\u7559）
\n {
\n key_state = KEY_IDLE;
\n }
\n break;<\/p>\n

case KEY_RELEASED:
\n if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_SET)
\n {
\n key_state = KEY_IDLE;
\n }
\n break;
\n }
\n}<\/p>\n

\n \u6b64\u72b6\u6001\u673a\u786e\u4fdd：<\/p>\n

– \u5355\u6b21\u6309\u952e\u4ec5\u89e6\u53d1\u4e00\u6b21<\/p>\n

alarm_flag<\/p>\n

\u7ffb\u8f6c；<\/p>\n

– 20ms\u786c\u4ef6\u6d88\u6296\u65f6\u95f4\u8986\u76d6\u7edd\u5927\u591a\u6570\u6309\u952e\u89c4\u683c；<\/p>\n

– \u957f\u6309\u68c0\u6d4b\u4e3a\u540e\u7eed\u529f\u80fd（\u5982\u9608\u503c\u91cd\u8bbe）\u9884\u7559\u63a5\u53e3\u3002\n<\/p>\n

\n 1.6.2 \u4e3b\u5faa\u73af\u96c6\u6210\u4e0e\u6267\u884c\u65f6\u5e8f
\n<\/h5>\n

\n \u6700\u7ec8<\/p>\n

main()<\/p>\n

\u51fd\u6570\u4e3b\u5faa\u73af\u7ed3\u6784\u5982\u4e0b：\n<\/p>\n

int main(void)
\n{
\n HAL_Init();
\n SystemClock_Config();
\n MX_GPIO_Init();
\n MX_TIM3_Init();
\n MX_USART1_UART_Init(); \/\/ \u7528\u4e8e\u8c03\u8bd5\u8f93\u51fa
\n MX_I2C1_Init(); \/\/ \u7528\u4e8e\u5149\u7167\u4f20\u611f\u5668
\n \/\/ … \u5176\u4ed6\u5916\u8bbe\u521d\u59cb\u5316<\/p>\n

\/\/ \u542f\u52a8TIM3
\n HAL_TIM_Base_Start_IT(&htim3);<\/p>\n

uint32_t last_sensor_read = 0;<\/p>\n

while (1)
\n {
\n \/\/ \u6bcf500ms\u8bfb\u53d6\u4e00\u6b21\u4f20\u611f\u5668
\n if (HAL_GetTick() – last_sensor_read >= 500)
\n {
\n read_all_sensors(); \/\/ \u8bfb\u53d6\u539f\u59cb\u503c
\n update_sensor_filters(temp_raw, humi_raw, light_raw); \/\/ \u6ee4\u6ce2
\n last_sensor_read = HAL_GetTick();
\n }<\/p>\n

\/\/ \u6bcf10ms\u68c0\u6d4b\u6309\u952e
\n check_key_state();<\/p>\n

\/\/ \u6bcf100ms\u6253\u5370\u8c03\u8bd5\u4fe1\u606f（\u53ef\u9009）
\n if (HAL_GetTick() % 100 == 0)
\n {
\n printf("T:%d H:%d L:%lu ALARM:%d\\\\r\\\\n",
\n get_filtered_temp(), get_filtered_humi(),
\n get_filtered_light(), alarm_flag);
\n }
\n }
\n}<\/p>\n

\n \u65f6\u5e8f\u8bbe\u8ba1\u8981\u70b9：<\/p>\n

– \u4f20\u611f\u5668\u91c7\u6837\u5468\u671f（500ms）\u8fdc\u5927\u4e8e\u5355\u6b21\u8bfb\u53d6\u8017\u65f6（<10ms），\u907f\u514d\u603b\u7ebf\u963b\u585e；<\/p>\n

– \u6309\u952e\u626b\u63cf（10ms）\u4e0e\u62a5\u8b66\u903b\u8f91\u89e3\u8026，\u786e\u4fdd\u54cd\u5e94\u7075\u654f；<\/p>\n

– \u8c03\u8bd5\u8f93\u51fa\u5f02\u6b65\u8fdb\u884c，\u4e0d\u5f71\u54cd\u5b9e\u65f6\u6027\u3002\n<\/p>\n

\n 1.7 \u7cfb\u7edf\u8054\u8c03\u4e0e\u5e38\u89c1\u95ee\u9898\u6392\u67e5
\n<\/h4>\n

\n \u5b8c\u6210\u7f16\u7801\u540e，\u9700\u8fdb\u884c\u5206\u5c42\u9a8c\u8bc1：\n<\/p>\n

\n 1.7.1 \u786c\u4ef6\u5c42\u9a8c\u8bc1
\n<\/h5>\n