stm32 按钮点灯

点灯

#include "stm32f10x.h"
#include <math.h>
#include <stdio.h>
#include "delay.h"

#define PI_F 3.14159265f
void led_init(){
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    IO_WriteBit(GPIOA, GPIO_Pin_0, Bit_SET);

}
int main(void)
{
    
    while (1)
    {
        if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_1) == Bit_RESET)
        {
            GPIO_WriteBit(GPIOA, GPIO_Pin_0, Bit_SET);
        }
        else
        {
            GPIO_WriteBit(GPIOA, GPIO_Pin_0, Bit_RESET);
        }
       
        
    }        
}

重写fputc（），串口打印字符串

int fputc(int ch, FILE *f)
{
    USART1_SendByte((uint8_t)ch);
    return ch;
}

串口发送数据

void usart_send_string(void)
{
    const char *str = "Hello, USART!\r\n";
    USART1_SendBuffer((const uint8_t *)str, (uint16_t)strlen(str));
}

串口接收数据

void usart_receive_string(void)
{
    static uint8_t buffer[128];
    static uint16_t len = 0;
    static uint32_t last_tick = 0;
    const uint32_t rx_timeout_ms = 200; // 超时（毫秒），无新字节则认为接收完成

    if (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) != RESET)
    {
        // 读取所有可用字节以防止在高波特率下漏掉数据
        while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) != RESET)
        {
            uint8_t ch = (uint8_t)USART_ReceiveData(USART1);
            if (len < sizeof(buffer) - 1)
            {
                buffer[len++] = ch;
            }
            last_tick = GetTick();

            if (ch == '\r' || ch == '\n')
            {
                // 去除结尾的 CR/LF 后打印
                while (len > 0 && (buffer[len-1] == '\r' || buffer[len-1] == '\n')) len--;
                if (len > 0)
                {
                    buffer[len] = '\0';
                    printf("RECV: %s\r\n", buffer);
                }
                len = 0;
            }
        }
    }

    // 若缓冲非空且超时，则认为接收完成，打印并清缓冲
    if (len > 0 && (GetTick() - last_tick) >= rx_timeout_ms)
    {
        buffer[len] = '\0';
        printf("RECV: %s\r\n", buffer);
        len = 0;
    }
}