单片机新手例程序/STM32开门狗实验

ID:549735 · 发表于 2019-5-28 22:47

/*  */

#include "public.h"
#define TXD GPIO_Pin_9
#define RXD GPIO_Pin_10

void GPIOINIT()          //???B?????
{
      GPIO_InitTypeDef GPIO_InitStructure;
      GPIO_InitStructure.GPIO_Pin=TXD;
      GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
      GPIO_Init(GPIOA,&GPIO_InitStructure);

      GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable , ENABLE);

      GPIO_InitStructure.GPIO_Pin=RXD;
      GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
      GPIO_Init(GPIOA,&GPIO_InitStructure);
}
void RCCINIT()       //?????????
{
      SystemInit();
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);       //?????ù???????
}
void USARTINIT()
{
      USART_InitTypeDef USART_InitStructure;
      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_Mode_Rx;
      USART_Init(USART1, &USART_InitStructure);

      USART_Cmd(USART1,ENABLE);
      USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
      USART_ClearFlag(USART1,USART_FLAG_TC);
}
void NVICINIT()
{
      NVIC_InitTypeDef NVIC_InitStructure;
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
      NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}
void IWDGINIT()
{
      IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);//?????????д????
      IWDG_SetPrescaler(IWDG_Prescaler_64);//????IWDG?????//40K/64=1.6ms
      IWDG_SetReload(800);//????IWDG??????  12λ???0~4095??//800*1.6ms=1.28s
      IWDG_ReloadCounter();//????IWDG?????????????????IWDG??????
      IWDG_Enable();//???IWDG
}
int fputc(int ch,FILE *p)
{
      USART_SendData(USART1,(u8)ch);
      while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
      return ch;
}
int main()
{
      RCCINIT();
      GPIOINIT();
      USARTINIT();
      NVICINIT();
      IWDGINIT();
      printf("??????????????\r\n");
      printf("88888888888\r\n");
      while(1)
      {
            IWDG_ReloadCounter();
            printf("????ι????\r\n");
            delayms(500);
      }
}

ID:509721 · 发表于 2019-5-29 11:39

函数命名很不规范，delay是怎么实现的的，是for循环空转耗时这种方式实现的么，如果是，不建议这样，学会利用定时器来实现延时，郭天祥的延时耽误了几代人

ID:549735 · 发表于 2019-5-29 23:26

andyf626 发表于 2019-5-29 11:39
函数命名很不规范，delay是怎么实现的的，是for循环空转耗时这种方式实现的么，如果是，不建议这样，学会利 ...

谢谢指教，延时方面确实不精

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