STM32F103RCT6开发板控制烟雾传感器模块代码

以下是使用STM32F103RCT6开发板控制烟雾传感器模块的代码示例。代码中使用了ADC模块读取传感器模块的模拟信号，然后根据信号值进行判断，并通过串口输出烟雾浓度值。

#include "stm32f10x.h"
#include "stdio.h"
#include "string.h"

#define SMOKE_SENSOR_PIN GPIO_Pin_0
#define SMOKE_SENSOR_PORT GPIOA
#define SMOKE_SENSOR_ADC_CHANNEL ADC_Channel_0

void USART1_Init(void);
void USART1_SendByte(uint8_t byte);
void USART1_SendString(char* str);
void ADC1_Init(void);
uint16_t ADC1_ReadValue(uint8_t channel);

int main(void)
{
    uint16_t smokeValue;
    char smokeStr[10];
    
    USART1_Init();
    ADC1_Init();
    
    while (1)
    {
        smokeValue = ADC1_ReadValue(SMOKE_SENSOR_ADC_CHANNEL);
        if (smokeValue > 500) {
            sprintf(smokeStr, "%d", smokeValue);
            USART1_SendString("Smoke concentration: ");
            USART1_SendString(smokeStr);
            USART1_SendString("\r\n");
        }
        else {
            USART1_SendString("No smoke detected\r\n");
        }
        delay_ms(1000);
    }
}

void USART1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &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_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);
    
    USART_Cmd(USART1, ENABLE);
}

void USART1_SendByte(uint8_t byte)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
    USART_SendData(USART1, byte);
}

void USART1_SendString(char* str)
{
    while (*str) {
        USART1_SendByte(*str++);
    }
}

void ADC1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    ADC_InitTypeDef ADC_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = SMOKE_SENSOR_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(SMOKE_SENSOR_PORT, &GPIO_InitStructure);
    
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);
    
    ADC_Cmd(ADC1, ENABLE);
    ADC_ResetCalibration(ADC1);
    while (ADC_GetResetCalibrationStatus(ADC1));
    ADC_StartCalibration(ADC1);
    while (ADC_GetCalibrationStatus(ADC1));
}

uint16_t ADC1_ReadValue(uint8_t channel)
{
    ADC_RegularChannelConfig(ADC1, channel, 1, ADC_SampleTime_55Cycles5);
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
    while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
    return ADC_GetConversionValue(ADC1);
}

void delay_ms(uint32_t ms)
{
    SysTick->LOAD = SystemCoreClock / 1000 * ms;
    SysTick->VAL = 0;
    SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;
    while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));
}

需要注意的是，代码中使用了串口输出烟雾浓度值，因此需要连接开发板的USART1的Tx和Rx引脚到电脑，以便通过串口调试助手查看输出结果。同时，代码中还需要定义一个延时函数`delay_ms()`，该函数使用了STM32的SysTick定时器实现，可以根据需要自行实现这个函数。