STM32实现简单的智能家居控制中心

以下是一个基于STM32的简单智能家居控制中心的代码案例。这个控制中心可以通过各种传感器和执行器与其他智能设备进行通信和控制，例如温度传感器、湿度传感器、光照传感器、继电器等。代码案例示范了如何初始化和使用这些传感器和执行器，并通过串口与其他设备进行通信。

首先，我们需要将STM32连接到各种传感器和执行器。假设我们连接了一个温度传感器、一个湿度传感器、一个光照传感器和一个继电器。以下是一个简单的电路连接示意图：

+-------------+

| STM32 |

| |

| PB0 (Tx) |-----------+

| PB1 (Rx) |-----------+

| PB2 (GPIO)|-----+

| PB3 (GPIO)|-----+

| PB4 (GPIO)|-----+

| PB5 (GPIO)|-----+

+-------------+ |

|

+------------------+

|

+----+ | +-----------------+

|Tmp | | | Temperature |

|Sens|-----+ | Sensor |

+----+ +-----------------+

+----+ | +-----------------+

|Hum | | | Humidity |

|Sens|-----+ | Sensor |

+----+ +-----------------+

+----+ | +-----------------+

|Ligh| | | Light |

|Sens|-----+ | Sensor |

+----+ +-----------------+

+----+ | +-----------------+

|Rel | | | Relay |

|ay |-----+ | Actuator |

+----+ +-----------------+

接下来，我们将逐步编写控制中心的代码。

首先，我们需要包含必要的库文件，并定义一些常量和变量：

#include "stm32f4xx.h"

#include "stdio.h"

#define USARTx USART2

#define USARTx_CLK RCC_APB1Periph_USART2

#define USARTx_CLK_INIT RCC_APB1PeriphClockCmd

#define USARTx_IRQn USART2_IRQn

#define USARTx_IRQHandler USART2_IRQHandler

#define USARTx_TX_PIN GPIO_Pin_2

#define USARTx_TX_GPIO_PORT GPIOA

#define USARTx_TX_GPIO_CLK RCC_AHB1Periph_GPIOA

#define USARTx_TX_SOURCE GPIO_PinSource2

#define USARTx_TX_AF GPIO_AF_USART2

#define USARTx_RX_PIN GPIO_Pin_3

#define USARTx_RX_GPIO_PORT GPIOA

#define USARTx_RX_GPIO_CLK RCC_AHB1Periph_GPIOA

#define USARTx_RX_SOURCE GPIO_PinSource3

#define USARTx_RX_AF GPIO_AF_USART2

#define TEMPERATURE_PIN GPIO_Pin_2

#define TEMPERATURE_GPIO_PORT GPIOB

#define TEMPERATURE_GPIO_CLK RCC_AHB1Periph_GPIOB

#define HUMIDITY_PIN GPIO_Pin_3

#define HUMIDITY_GPIO_PORT GPIOB

#define HUMIDITY_GPIO_CLK RCC_AHB1Periph_GPIOB

#define LIGHT_PIN GPIO_Pin_4

#define LIGHT_GPIO_PORT GPIOB

#define LIGHT_GPIO_CLK RCC_AHB1Periph_GPIOB

#define RELAY_PIN GPIO_Pin_5

#define RELAY_GPIO_PORT GPIOB

#define RELAY_GPIO_CLK RCC_AHB1Periph_GPIOB

float temperature = 0;

float humidity = 0;

float light = 0;

void GPIO_Configuration(void);

void USART_Configuration(void);

void ADC_Configuration(void);

void USART_SendString(USART_TypeDef* USARTx, uint8_t* data, uint16_t len);

接下来，我们编写初始化函数：

void GPIO_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHB1PeriphClockCmd(TEMPERATURE_GPIO_CLK | HUMIDITY_GPIO_CLK | LIGHT_GPIO_CLK | RELAY_GPIO_CLK, ENABLE);

GPIO_InitStructure.GPIO_Pin = TEMPERATURE_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(TEMPERATURE_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = HUMIDITY_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(HUMIDITY_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = LIGHT_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(LIGHT_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = RELAY_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(RELAY_GPIO_PORT, &GPIO_InitStructure);

}

void USART_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(USARTx_CLK, ENABLE);

RCC_AHB1PeriphClockCmd(USARTx_TX_GPIO_CLK | USARTx_RX_GPIO_CLK, ENABLE);

GPIO_PinAFConfig(USARTx_TX_GPIO_PORT, USARTx_TX_SOURCE, USARTx_TX_AF);

GPIO_PinAFConfig(USARTx_RX_GPIO_PORT, USARTx_RX_SOURCE, USARTx_RX_AF);

GPIO_InitStructure.GPIO_Pin = USARTx_TX_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = USARTx_RX_PIN;

GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 9600;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;

USART_InitStructure.USART_StopBits = USART_StopBits_1;

USART_InitStructure.USART_Parity = USART_Parity_No;

USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

USART_Init(USARTx, &USART_InitStructure);

USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = USARTx_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

USART_Cmd(USARTx, ENABLE);

}

void ADC_Configuration(void)

{

ADC_InitTypeDef ADC_InitStructure;

ADC_CommonInitTypeDef ADC_CommonInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;

ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;

ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;

ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;

ADC_CommonInit(&ADC_CommonInitStructure);

ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;

ADC_InitStructure.ADC_ScanConvMode = DISABLE;

ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;

ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_NbrOfConversion = 1;

ADC_Init(ADC1, &ADC_InitStructure);

ADC_TempSensorVrefintCmd(ENABLE);

ADC_TempSensorVrefintCmd(ENABLE);

ADC_SelectCalibrationMode(ADC1, ADC_CalibrationMode_Single);