【N32L43x评测】3、利用串口接收中断和空闲中断，实现不定长数据接收
<p><span style="font-size:20px;">1、实现思路</span></p><p>本文利用串口接收中断和空闲中断，实现串口不定长数据接收</p>
<p>接收中断：实现数据的接收；</p>
<p>空闲中断：判断一帧数据完成。</p>
<p> </p>
<p><span style="font-size:20px;">2、硬件</span></p>
<p>本文使用串口1，引脚为PA9和PA10，同时，PA9和PA10直接连接到了NS-LINK的usb转串口上，因此可以直接在电脑上查看。</p>
<p> </p>
<p><span style="font-size:20px;">3、代码实现</span></p>
<p>（1）串口初始化</p>
<pre>
<code class="language-cpp">void SerialInit(void)
{
/* Enable GPIO clock */
RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA , ENABLE);
/* Enable USARTy and USARTz Clock */
RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_USART1, ENABLE);
NVIC_InitType NVIC_InitStructure;
/* Enable the USART Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
GPIO_InitType GPIO_InitStructure;
/* Initialize GPIO_InitStructure */
GPIO_InitStruct(&GPIO_InitStructure);
/* Configure USARTx Tx as alternate function push-pull */
GPIO_InitStructure.Pin = GPIO_PIN_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Alternate = GPIO_AF4_USART1;//GPIO_Mode_AF_PP
GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);
/* Configure USARTx Rx as alternate function push-pull and pull-up */
GPIO_InitStructure.Pin = GPIO_PIN_10;
GPIO_InitStructure.GPIO_Pull = GPIO_Pull_Up;
GPIO_InitStructure.GPIO_Alternate = GPIO_AF4_USART1;
GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);
USART_InitType USART_InitStructure;
USART_StructInit(&USART_InitStructure);
USART_InitStructure.BaudRate = 115200;
USART_InitStructure.WordLength = USART_WL_8B;
USART_InitStructure.StopBits = USART_STPB_1;
USART_InitStructure.Parity = USART_PE_NO;
USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;
USART_InitStructure.Mode = USART_MODE_RX | USART_MODE_TX;
/* Configure USART*/
USART_Init(USART1, &USART_InitStructure);
/* Enable USARTy Receive and Transmit interrupts */
USART_ConfigInt(USART1, USART_INT_RXDNE, ENABLE);
USART_ConfigInt(USART1, USART_INT_IDLEF, ENABLE);
USART_Enable(USART1, ENABLE);
}
</code></pre>
<p>（2）串口中断</p>
<pre>
<code class="language-cpp">void USART1_IRQHandler(void)
{
if(RESET != USART_GetIntStatus(USART1, USART_INT_RXDNE))
{
SerialRecv(USART_ReceiveData(USART1));
}
if(RESET !=USART_GetIntStatus(USART1, USART_INT_IDLEF))
{
USART_ReceiveData(USART1);
SerialStr.Idle=1;
}
}</code></pre>
<p>（3）接收应用代码</p>
<pre>
<code class="language-cpp">void SerialRecv(uint8_t data)
{
if(SerialStr.RecvLen<UART_MAX_LEN)
{
SerialStr.RecvBuff=data;
}
}
void SerialSend(uint8_t *data,uint8_t len)
{
for(uint8_t i=0; i<len;i++)
{
while (RESET == USART_GetFlagStatus(USART1, USART_FLAG_TXDE ));
USART_SendData(USART1, data);
}
}
void SerialPro(void)
{
if(SerialStr.Idle&&SerialStr.RecvLen)
{
printf("Recv:%d,[",SerialStr.RecvLen);
SerialSend(SerialStr.RecvBuff,SerialStr.RecvLen);
printf("]\r\n");
SerialStr.RecvLen=0;
SerialStr.Idle=0;
}
}
int fputc(int ch, FILE *f)
{
while (RESET == USART_GetFlagStatus(USART1, USART_FLAG_TXDE )) {};
USART_SendData(USART1, (uint8_t) ch);
return ch;
}
</code></pre>
<p> </p>
<p><span style="font-size:20px;">4、测试</span></p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p>您好，请问有源代码吗？</p>
<p>有些单片机没有空闲中断就很恶心。</p>
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