灵动微MM32F013x芯片学习-UART1中断接收_灵动微f0144 uart1-优快云博客

该代码实现STM32的UART初始化，包括时钟使能、GPIO配置、波特率设置、接收和发送的使能，并设置了接收中断处理函数。在初始化过程中，根据UART1或UART2选择相应的时钟源和GPIO引脚，同时配置为浮点输入和推挽输出。中断处理函数中处理了接收中断并清除了接收标志。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

//busclk unit is 1Khz
void uart_init (UART_TypeDef *UART,uint32 busclk,uint32 baud)
{
uint16 BRR=0;

   //enable clock
   RCC->AHBENR |= RCC_AHBENR_GPIOB; //enablePORTB clock
   RCC->AHBENR |= RCC_AHBENR_GPIOC; //enablePORTC clock

   if(UART == UART1)
       RCC->APB2ENR |= RCC_APB2ENR_UART1;
   else
       RCC->APB1ENR |= RCC_APB1ENR_UART2;

   //pin mux
   if(UART == UART1)
   {
       //UART1_TX -> B6
       GPIOB->AFRL &= ~GPIO_AFRL_AFR6;
       GPIOB->AFRL |= (GPIO_AF_MODE0 << GPIO_AFRL_AFR6_Pos);

       GPIOB->CRL &= ~(GPIO_CNF_MODE_MASK << GPIO_CRL_CNF_MODE_6_Pos);
       GPIOB->CRL |= (GPIO_CNF_MODE_AF_PP << GPIO_CRL_CNF_MODE_6_Pos);

       //UART1_RX -> B7
       GPIOB->AFRL &= ~GPIO_AFRL_AFR7;
       GPIOB->AFRL |= (GPIO_AF_MODE0 << GPIO_AFRL_AFR7_Pos);

       GPIOB->CRL &= ~(GPIO_CNF_MODE_MASK << GPIO_CRL_CNF_MODE_7_Pos);
       GPIOB->CRL |= (GPIO_CNF_MODE_FLOATING << GPIO_CRL_CNF_MODE_7_Pos);
   }
   else
   {
       //UART2_TX -> C4
       GPIOC->AFRL &= ~GPIO_AFRL_AFR4;
       GPIOC->AFRL |= (GPIO_AF_MODE3 << GPIO_AFRL_AFR4_Pos);

       GPIOC->CRL &= ~(GPIO_CNF_MODE_MASK << GPIO_CRL_CNF_MODE_4_Pos);
       GPIOC->CRL |= (GPIO_CNF_MODE_AF_PP << GPIO_CRL_CNF_MODE_4_Pos);

       //UART2_RX -> C5
       GPIOC->AFRL &= ~GPIO_AFRL_AFR5;
       GPIOC->AFRL |= (GPIO_AF_MODE0 << GPIO_AFRL_AFR5_Pos);

       GPIOC->CRL &= ~(GPIO_CNF_MODE_MASK << GPIO_CRL_CNF_MODE_5_Pos);
       GPIOC->CRL |= (GPIO_CNF_MODE_FLOATING << GPIO_CRL_CNF_MODE_5_Pos);
   }

   //reset uart module
   if(UART == UART1)
   {
       RCC->APB2RSTR |= RCC_APB2RSTR_UART1;
       RCC->APB2RSTR &= ~(RCC_APB2RSTR_UART1);
   }
   else
   {
       RCC->APB1RSTR |= RCC_APB1RSTR_UART2;
       RCC->APB1RSTR &= ~(RCC_APB1RSTR_UART2);
   }

/* Configure the UART for 8-bit mode, no parity , 1 stop*/
UART->CCR = UART_CCR_CHAR_8b;

   /* Calculate baud settings */
   BRR = busclk*1000/baud/16;
   UART->BRR = BRR;

   /* Enable receiver and transmitter */
   UART->GCR |= UART_GCR_RX;//Enable receiver
   UART->GCR |= UART_GCR_TX;//Enable transmitter

//enable rx interrupt
UART1->IER |= UART_IER_RX;

//enable uart
UART->GCR |= UART_GCR_UART;

   if(UART1 == UART)
   {
       NVIC_SetPriority(UART1_IRQn,3);
       NVIC_EnableIRQ(UART1_IRQn);
   }
   else
   {
       NVIC_SetPriority(UART2_IRQn,3);
       NVIC_EnableIRQ(UART2_IRQn);
   }
}

void UART1_IRQHandler(void)
{

uint8 tmp=0;
   if(UART1->ISR & UART_ISR_RX)
   {
       UART1->ICR = UART_ICR_RX;//clear receive interrupt
       tmp = base->RDR;
   }
}