学习STM32的智能床垫监测
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智能床垫监测系统使用STM32微控制器可以实现许多功能，包括测量压力、体重、体温、呼吸频率和心率等。本文将详细介绍如何使用STM32来实现一个智能床垫监测系统的代码案例。
代码案例一：测量压力
首先，我们需要连接一个压力传感器到STM32微控制器。可以选择使用模拟输入引脚或者I2C接口来连接传感器。以下为使用模拟输入引脚连接压力传感器的示例代码：
#include "stm32f4xx.h"
#define ADC_PORT GPIOA
#define ADC_PIN GPIO_Pin_0
#define ADC_CHANNEL ADC_Channel_0
void ADC_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = ADC_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(ADC_PORT, &GPIO_InitStructure);
ADC_DeInit();
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Cmd(ADC1, ENABLE);
ADC_RegularChannelConfig(ADC1, ADC_CHANNEL, 1, ADC_SampleTime_3Cycles);
ADC_SoftwareStartConv(ADC1);
}
int main(void)
{
uint16_t adc_value;
ADC_Configuration();
while (1)
{
while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET)
;
adc_value = ADC_GetConversionValue(ADC1);
// 进行相关处理
ADC_SoftwareStartConv(ADC1);
}
}
代码解读需要注意的是，上述代码中我们使用了ADC模块来读取压力传感器的数值。在初始化配置中，需要设置ADC的分辨率、采样时间和通道等参数。在主循环中，我们不断读取ADC模块的转换结果，并进行相关处理。
代码案例二：测量体温
接下来，我们将介绍如何使用STM32来测量体温。我们可以使用一个温度传感器来读取体温数值。以下为使用I2C接口连接温度传感器的示例代码：
#include "stm32f4xx.h"
#define I2C_PORT GPIOB
#define I2C_SCL_PIN GPIO_Pin_6
#define I2C_SDA_PIN GPIO_Pin_7
void I2C_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = I2C_SCL_PIN | I2C_SDA_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(I2C_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);
I2C_DeInit(I2C1);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 100000;
I2C_Init(I2C1, &I2C_InitStructure);
I2C_Cmd(I2C1, ENABLE);
}
int main(void)
{
uint16_t temperature;
I2C_Configuration();
while (1)
{
I2C_GenerateSTART(I2C1, ENABLE);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
;
I2C_Send7bitAddress(I2C1, 0x90, I2C_Direction_Receiver);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
;
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
;
temperature = I2C_ReceiveData(I2C1);
I2C_GenerateSTOP(I2C1, ENABLE);
// 进行相关处理
}
}
代码解读在上述代码中，我们使用了I2C接口来读取温度传感器的数据。在初始化配置中，需要设置I2C的时钟速度、自身地址等参数。在主循环中，我们先发送起始信号，然后等待接收模式选择完成。接着，读取接收到的温度数据，并发送停止信号。
代码案例三：测量心率
最后，我们将介绍如何使用STM32来测量心率。我们可以使用一个光电传感器来读取心率数值。以下为使用中断和定时器来连接光电传感器的示例代码：
#include "stm32f4xx.h"
#define SENSOR_PORT GPIOA
#define SENSOR_PIN GPIO_Pin_0
uint32_t counter = 0;
float heart_rate = 0;
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
counter++;
if (counter >= 600)
{
heart_rate = 60 / (counter * 0.001);
counter = 0;
}
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
}
}
void EXTI0_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line0) != RESET)
{
counter = 0;
EXTI_ClearITPendingBit(EXTI_Line0);
}
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
GPIO_InitStructure.GPIO_Pin = SENSOR_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(SENSOR_PORT, &GPIO_InitStructure);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_TimeBaseStructure.TIM_Period = 1000 - 1;
TIM_TimeBaseStructure.TIM_Prescaler = 84 - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
int main(void)
{
GPIO_Configuration();
while (1)
{
// 进行相关处理
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