寄存器编写条件1.使用stm32f103c8t6,c语言编程 条件2.使用PA0,PA1,PA2,PA3,PA4,PA5。配置成上拉输入,根据6个引脚的电平高低生成二进制数。例如000000表示6引脚电平全为0;并使用串口1发送二进制数给PC端。 条件3.串口1使用中断接收数据,结束符0X0D,0X0A. 条件4.串口1接收字符串"1"打开蜂鸣器,接收字符串"2"关闭蜂鸣器; 条件5.统计条件2中二进制数0的次数，若后一次条件2的二进制数0的次数大于前一次二进制数0的次数;若后一次条件2的二进制数0的次数小于前一次二进制数0的次数;打开蜂鸣器。

以下是符合条件的C语言代码：

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

#define BUFSIZE 128

uint8_t buffer[BUFSIZE];
uint8_t count = 0;
uint8_t beep = 0;
uint8_t last_zero_count = 0;
uint8_t current_zero_count = 0;

void USART1_IRQHandler(void)
{
if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
uint8_t data = USART_ReceiveData(USART1);
if (data == '\r' || data == '\n')
{
buffer[count] = '\0';
if (strcmp((char*)buffer, "1") == 0)
{
beep = 1;
}
else if (strcmp((char*)buffer, "2") == 0)
{
beep = 0;
}
count = 0;
}
else
{
buffer[count++] = data;
}
}
}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

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_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART_Cmd(USART1, ENABLE);
}

void SysTick_Handler(void)
{
static uint32_t last_tick = 0;
if (SysTick_Config(SystemCoreClock / 1000))
{
while (1);
}
if (beep)
{
if (current_zero_count > last_zero_count)
{
GPIO_SetBits(GPIOA, GPIO_Pin_6);
}
else if (current_zero_count < last_zero_count)
{
GPIO_ResetBits(GPIOA, GPIO_Pin_6);
}
last_zero_count = current_zero_count;
}
uint8_t data = 0;
data |= GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) << 0;
data |= GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_1) << 1;
data |= GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_2) << 2;
data |= GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3) << 3;
data |= GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_4) << 4;
data |= GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_5) << 5;
printf("%d\r\n", data);
if (data == 0)
{
current_zero_count++;
}
}

int main(void)
{
GPIO_Configuration();
USART_Configuration();
SysTick_Config(SystemCoreClock / 1000);

while (1);
}