stm32f103c8t6电子密码锁程序

以下是一个简单的基于STM32F103C8T6的电子密码锁程序：

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

#define PASSWORD_LENGTH 6
#define MAX_ATTEMPTS 3

GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

uint8_t password[PASSWORD_LENGTH] = {'1', '2', '3', '4', '5', '6'};
uint8_t attempt_count = 0;
uint8_t password_index = 0;
uint8_t input_buffer[PASSWORD_LENGTH];
uint8_t input_index = 0;
uint8_t is_locked = 1;

void GPIO_Configuration(void)
{
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); 
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void USART_Configuration(void)
{
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
  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_Tx; 
  USART_Init(USART1, &USART_InitStructure);
  USART_Cmd(USART1, ENABLE);
}

void NVIC_Configuration(void)
{
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void TIM_Configuration(void)
{
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  TIM_TimeBaseStructure.TIM_Period = 2000 - 1;
  TIM_TimeBaseStructure.TIM_Prescaler = 7200 - 1;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
  TIM_Cmd(TIM2, ENABLE);
}

void TIM2_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) {
    USART_SendData(USART1, 'L');
    while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
  }
}

void check_password(void)
{
  if (memcmp(input_buffer, password, PASSWORD_LENGTH) == 0) {
    USART_SendData(USART1, 'U');
    while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
    attempt_count = 0;
    input_index = 0;
  } else {
    ++attempt_count;
    if (attempt_count >= MAX_ATTEMPTS) {
      is_locked = 1;
      USART_SendData(USART1, 'E');
      while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
    } else {
      USART_SendData(USART1, 'F');
      while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
      input_index = 0;
    }
  }
}

int main(void)
{
  GPIO_Configuration();
  USART_Configuration();
  NVIC_Configuration();
  TIM_Configuration();

  while (1) {
    if (!is_locked) {
      if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)) {
        input_buffer[input_index++] = '1';
        while (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0));
      }
      if (input_index == PASSWORD_LENGTH) {
        check_password();
      }
    } else {
      USART_SendData(USART1, 'L');
      while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
    }
  }
}

这个程序使用USART1发送指定的字符以进行锁定，解锁或错误提示。 它还使用定时器TIM2来检测锁定状态并在锁定状态下发送“ L”以指示锁定状态。 它使用GPIOA0作为输入以输入密码。 每当按下按钮时，它将'1'添加到输入缓冲区中，并在输入完成时检查密码。 如果输入与密码匹配，则将尝试计数器重置为0并清除输入缓冲区。 如果输入与密码不匹配，则将尝试计数器递增，并在达到最大尝试次数时将锁定标志设置为1以防止进一步的密码输入。