51单片机和stm32串口通信，stm32 上按键B11按下，51 单片机蜂鸣器鸣叫报警时间增加，分别写出51和32keil的代码

51单片机的代码：

#include <reg51.h>
sbit beep = P2^3;   //定义蜂鸣器控制引脚
unsigned char time = 0;  //计时器
void main()
{
    TMOD = 0x01;   //设置定时器1为模式1
    TH1 = 0xFC;    //计时器初值
    TL1 = 0x66;
    TR1 = 1;       //启动定时器1
    while(1)
    {
        if(RI)     //如果有数据接收
        {
            RI = 0;   //清除接收标志位
            if(SBUF == 0x01)  //接收到按键B11的命令
            {
                beep = ~beep;   //蜂鸣器状态取反
            }
        }
        if(time >= 10)   //每1秒钟增加1次时间
        {
            time = 0;  //清零计时器
            beep = ~beep;  //蜂鸣器状态取反
        }
    }
}
void timer() interrupt 1   //定时器1中断服务函数
{
    TH1 = 0xFC;   //计时器初值
    TL1 = 0x66;
    time++;    //计时器加1
}

STM32的代码：

#include "stm32f10x.h"
#define B11 GPIO_Pin_11  //按键B11对应的引脚
#define beep GPIO_Pin_8  //蜂鸣器对应的引脚
unsigned char time = 0;   //计时器
void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);  //启用GPIOA和GPIOB时钟
    GPIO_InitStructure.GPIO_Pin = B11;   //配置B11引脚
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;   //设置为上拉输入模式
    GPIO_Init(GPIOB, &GPIO_InitStructure);   //初始化GPIOB
    GPIO_InitStructure.GPIO_Pin = beep;   //配置蜂鸣器引脚
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //设置为推挽输出模式
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  //设置输出速率为50MHz
    GPIO_Init(GPIOA, &GPIO_InitStructure);  //初始化GPIOA
}
void USART_Configuration(void)
{
    USART_InitTypeDef USART_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);  //启用USART1和GPIOA时钟
    USART_DeInit(USART1);  //复位USART1
    USART_InitStructure.USART_BaudRate = 9600;   //设置波特率为9600
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;   //设置数据位为8位
    USART_InitStructure.USART_StopBits = USART_StopBits_1;   //设置停止位为1位
    USART_InitStructure.USART_Parity = USART_Parity_No;   //设置无奇偶校验
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;  //设置无硬件流控制
    USART_InitStructure.USART_Mode = USART_Mode_Rx;   //仅接收模式
    USART_Init(USART1, &USART_InitStructure);   //初始化USART1
    USART_Cmd(USART1, ENABLE);   //使能USART1
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;   //配置USART1_TX引脚
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   //设置为复用推挽输出模式
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  //设置输出速率为50MHz
    GPIO_Init(GPIOA, &GPIO_InitStructure);   //初始化GPIOA
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;  //配置USART1_RX引脚
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //设置为浮空输入模式
    GPIO_Init(GPIOA, &GPIO_InitStructure);   //初始化GPIOA
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);   //使能USART1接收中断
}
void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);   //设置中断分组
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;   //设置中断通道为USART1
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;   //设置抢占优先级为0
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;   //设置响应优先级为0
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   //使能中断通道
    NVIC_Init(&NVIC_InitStructure);  //初始化中断向量表
}
void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);  //启用TIM2时钟
    TIM_TimeBaseStructure.TIM_Period = 999;   //设置计数器周期为1000
    TIM_TimeBaseStructure.TIM_Prescaler = 7199;  //设置预分频系数为7200
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;   //设置时钟分频为1
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //设置计数器为向上计数模式
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);  //初始化TIM2
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);   //使能更新中断
    TIM_Cmd(TIM2, ENABLE);   //使能TIM2
}
int main(void)
{
    GPIO_Configuration();   //初始化GPIO
    USART_Configuration();  //初始化USART
    NVIC_Configuration();   //初始化中断向量表
    TIM_Configuration();    //初始化定时器
    while(1)
    {
        if(GPIO_ReadInputDataBit(GPIOB, B11) == RESET)  //如果按键B11被按下
        {
            USART_SendData(USART1, 0x01);   //向USART1发送命令
            while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);  //等待发送完成
        }
        if(time >= 10)   //如果计时器达到1秒钟
        {
            time = 0;   //重置计时器
            GPIO_WriteBit(GPIOA, beep, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOA, beep)));  //蜂鸣器状态取反
        }
    }
}
void USART1_IRQHandler(void)   //USART1中断服务函数
{
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //如果接收到数据
    {
        if(USART_ReceiveData(USART1) == 0x01)   //如果接收到按键B11的命令
        {
            GPIO_WriteBit(GPIOA, beep, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOA, beep)));  //蜂鸣器状态取反
        }
    }
}
void TIM2_IRQHandler(void)   //TIM2中断服务函数
{
    if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)  //如果更新中断标志位被置位
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);   //清除更新中断标志位
        time++;   //计时器加1
    }
}