STM32 矩阵键盘密码验证：8位密码输入与 OLED 显示

#include "stm32f10x.h" #include "stm32f10x_gpio.h" #include "stm32f10x_rcc.h" #include "stm32f10x_usart.h" #include "stm32f10x_i2c.h" #include "stdio.h" #include "stdlib.h" #include "string.h" #include "oled.h"

#define ROW_NUM 4 #define COL_NUM 4 #define PASSWORD_LENGTH 8

char password[PASSWORD_LENGTH] = '12345678'; char input[PASSWORD_LENGTH];

void delay_ms(uint16_t ms) { while (ms--) { uint16_t count = 16000; while (count--); } }

void GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

}

uint8_t ReadRow(void) { uint8_t row = 0; row |= (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_11) << 3); row |= (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_12) << 2); row |= (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_13) << 1); row |= GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_14); return row; }

uint8_t ReadCol(void) { uint8_t col = 0; col |= (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_4) << 3); col |= (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_5) << 2); col |= (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_6) << 1); col |= GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_7); return col; }

uint8_t GetKeyPress(void) { uint8_t row, col; GPIO_ResetBits(GPIOC, GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7); GPIO_SetBits(GPIOC, GPIO_Pin_4); col = ReadCol(); if (col != 0) { while (ReadCol() != 0); return col; }

GPIO_ResetBits(GPIOC, GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7);
GPIO_SetBits(GPIOC, GPIO_Pin_5);
col = ReadCol();
if (col != 0) {
    while (ReadCol() != 0);
    return col + 4;
}

GPIO_ResetBits(GPIOC, GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7);
GPIO_SetBits(GPIOC, GPIO_Pin_6);
col = ReadCol();
if (col != 0) {
    while (ReadCol() != 0);
    return col + 8;
}

GPIO_ResetBits(GPIOC, GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7);
GPIO_SetBits(GPIOC, GPIO_Pin_7);
col = ReadCol();
if (col != 0) {
    while (ReadCol() != 0);
    return col + 12;
}

return 0;

}

void USART_Configuration(void) { USART_InitTypeDef USART_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

USART_InitStructure.USART_BaudRate = 115200;
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 USART_SendString(char* str) { while (*str) { while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); USART_SendData(USART1, *str++); } }

void Buzzer_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

}

void Buzzer_On(void) { GPIO_SetBits(GPIOA, GPIO_Pin_8); }

void Buzzer_Off(void) { GPIO_ResetBits(GPIOA, GPIO_Pin_8); }

void OLED_Display(char* str) { OLED_Clear(); OLED_ShowString(0, 0, str); OLED_Refresh_Gram(); }

int main(void) { GPIO_Configuration(); USART_Configuration(); Buzzer_Init(); OLED_Init();

OLED_Display("Please enter password:");

uint8_t index = 0;
while (1) {
    uint8_t key = GetKeyPress();
    if (key != 0) {
        input[index++] = key;
        Buzzer_On();
        delay_ms(100);
        Buzzer_Off();
        if (index == PASSWORD_LENGTH) {
            if (strcmp(password, input) == 0) {
                OLED_Display("Pass!");
                USART_SendString("Pass!\r\n");
                delay_ms(1000);
                Buzzer_On();
                delay_ms(500);
                Buzzer_Off();
                delay_ms(500);
                Buzzer_On();
                delay_ms(500);
                Buzzer_Off();
            } else {
                OLED_Display("Warning!");
                USART_SendString("Warning!\r\n");
                while (1) {
                    Buzzer_On();
                    delay_ms(250);
                    Buzzer_Off();
                    delay_ms(250);
                }
            }
        }
    }
}