我的问题是stm32停止模式方面的问题

ID:427492 · 发表于 2019-5-17 20:19

本帖最后由枫树566 于 2019-5-17 22:52 编辑

我做了一个关于STM32停止模式下的唤醒实验，我是利用把串口接收端口配置为外部中断方式。现在可以通过串口发送一个字符唤醒，但是我想把这个唤醒它的字符，打印到串口助手上，我试了好多次都不能显示。我想问问大家有没有解决办法，把那个唤醒单片机的字符打印到串口助手上。大佬看到后，能帮帮我。

ID:427492 · 发表于 2019-5-20 16:35

没有大佬做过停止模式的实验吗？求助好久了，也没见人提意见。哎

ID:427492 · 发表于 2019-5-20 19:23

static void Delay(__IO uint32_t nCount)       //延时函数
{
      for(; nCount != 0; nCount--);
}

static void SYSCLKConfig_STOP(void)                                        //停机唤醒后配置系统时钟
{
      /* After wake-up from STOP reconfigure the system clock */
      /* 使能 HSE */
      RCC_HSEConfig(RCC_HSE_ON);

      /* 等待 HSE 准备就绪 */
      while (RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);

      /* 使能 PLL */
      RCC_PLLCmd(ENABLE);

      /* 等待 PLL 准备就绪 */
      while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);

      /* 选择PLL作为系统时钟源 */
      RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

      /* 等待PLL被选为系统时钟源*/
      while (RCC_GetSYSCLKSource() != 0x08);
}

void USARTx_Config(uint32_t BAUDRATE)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;
      RCC_APB2PeriphClockCmd(USARTx_TX_Clk | USARTx_RX_Clk | USARTx_AFIO_Clk,ENABLE);


      GPIO_InitStructure.GPIO_Pin = USARTx_TX_Pin;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(USARTx_TX_Port,&GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin = USARTx_RX_Pin;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_Init(USARTx_RX_Port,&GPIO_InitStructure);
      USART_DeInit(USARTx);
      USART_InitStructure.USART_BaudRate = BAUDRATE;
      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(USARTx,&USART_InitStructure);

      USART_ITConfig(USART1, USART_IT_TXE, DISABLE);


      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
   NVIC_InitStructure.NVIC_IRQChannel = USARTx_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

      NVIC_Init(&NVIC_InitStructure);
      USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
      USART_Cmd(USARTx,ENABLE);
}

void EXTI_PA10_Config(void)
{
      EXTI_InitTypeDef EXTI_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

      GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource10);
      EXTI_InitStructure.EXTI_Line = EXTI_Line10;
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;

      NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

      NVIC_Init(&NVIC_InitStructure);
      EXTI_Init(&EXTI_InitStructure);
}

int main(void)
{
      LED_GPIO_Config();
      USARTx_Config(115200);
      EXTI_PA10_Config();

      printf("\r\n 停止模式实验\r\n");
      while(1)
      {
            Delay(0x1FFFFF);       // 延时，不那么快进入停止模式

            printf("\r\n 进入停止模式，LED灯亮\r\n");
            LED(ON);
            /* 进入停止模式，设置电压调节器为低功耗模式，等待中断唤醒 */
            PWR_EnterSTOPMode(PWR_Regulator_LowPower,PWR_STOPEntry_WFI);

            //从停止模式下，被唤醒后使用的是HSI时钟，此处重启HSI时钟，使用PLLCLK
            SYSCLKConfig_STOP();

            Delay(0x0FFFF);       //延时

            printf("\r\n 已退出停止模式\r\n");

  }
}

void EXTI15_10_IRQHandler(void)
{
      if(EXTI_GetITStatus(EXTI_Line10) != RESET)
      {
            LED(OFF);
            EXTI_ClearITPendingBit(EXTI_Line10);
      }
}
//接收字符
void USART1_IRQHandler(void)
{
      uint8_t ucTemp;
      if(USART_GetITStatus(USARTx,USART_IT_RXNE)!=RESET)
      {
            ucTemp = USART_ReceiveData(USARTx);
            printf("串口发送字符为:");
            printf("%c\r\n",ucTemp);
      }
}

帐号		自动登录	找回密码
密码			立即注册

我的问题是stm32停止模式方面的问题

相关帖子

浏览过的版块