增加中断接收模式，未测试。

zhyinch

2021-09-05 c20b80fe9dfe72220649bf1d85550e9f3ebc9549

 源码/核心板/Src/OnChipDevices/Rcc_Nvic_Systick.c

@@ -129,19 +129,16 @@
   
   /* Enable and set EXTI Interrupt to the lowest priority */
    NVIC_InitStructure.NVIC_IRQChannel = DECAIRQ_EXTI_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 15;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

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

   
    NVIC_Init(&NVIC_InitStructure);
}
@@ -195,7 +192,7 @@
void delay_us(uint32_t nTimer)  
{  
    uint32_t i=0;  
    for(i=0;i<nTimer;i++){  
    for(i=0;i<nTimer*5;i++){  
        __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();
      __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();
      __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();