EFR32FG14 UART的使用方法

EFR32FG14 UART的使用方法

1.初始化串口（PA0->TX ,PA1->RX）

void RETARGET_SerialInit(void)
{
  /* Enable peripheral clocks */
  CMU_ClockEnable(cmuClock_HFPER, true);

  /* Configure GPIO pins */
  CMU_ClockEnable(cmuClock_GPIO, true);
  /* To avoid false start, configure output as high */
  GPIO_PinModeSet(gpioPortA, 0，gpioModePushPull, 1);
  GPIO_PinModeSet(gpioPortA, 1, gpioModeInputPull, 1);

  USART_TypeDef           *usart = RETARGET_UART;
  USART_InitAsync_TypeDef init   = USART_INITASYNC_DEFAULT;

  /* Enable DK RS232/UART switch */
  RETARGET_PERIPHERAL_ENABLE();

  CMU_ClockEnable(RETARGET_CLK, true);

  /* Configure USART for basic async operation */
  init.enable = usartDisable;
  init.baudrate = 9600;
  USART_InitAsync(usart, &init);


  /* Enable pins at correct UART/USART location. */
  #if defined(USART_ROUTEPEN_RXPEN)
  usart->ROUTEPEN = USART_ROUTEPEN_RXPEN | USART_ROUTEPEN_TXPEN;
  usart->ROUTELOC0 = (usart->ROUTELOC0
                      & ~(_USART_ROUTELOC0_TXLOC_MASK
                          | _USART_ROUTELOC0_RXLOC_MASK) )
                     | (RETARGET_TX_LOCATION << _USART_ROUTELOC0_TXLOC_SHIFT)
                     | (RETARGET_RX_LOCATION << _USART_ROUTELOC0_RXLOC_SHIFT);


  /* Clear previous RX interrupts */
  USART_IntClear(RETARGET_UART, USART_IF_RXDATAV);
  NVIC_ClearPendingIRQ(RETARGET_IRQn);

  /* Enable RX interrupts */
  USART_IntEnable(RETARGET_UART, USART_IF_RXDATAV);
  NVIC_EnableIRQ(RETARGET_IRQn);

  /* Finally enable it */
  USART_Enable(usart, usartEnable);

  USART_IntEnable(USART0, USART_IEN_RXDATAV);
  USART_IntEnable(USART0, USART_IEN_TXC);

	//Enabling USART Interrupts
  NVIC_EnableIRQ(USART0_RX_IRQn);

  USART_IntSet(USART0, USART_IFS_TXC);



  setvbuf(stdout, NULL, _IONBF, 0);   /*Set unbuffered mode for stdout (newlib)*/

  initialized = true;
}

2.编写串口接收中断函数

void USART0_RX_IRQHandler(void)
{
  uint32_t flags;

  flags = USART_IntGet(USART0);
  USART0->IFC = flags;
  uart_rxPtr[len++] = USART_Rx(USART0);

}

3.主函数调用即可

RETARGET_SerialInit();

串口接收到的数据直接存储在数组uart_rxPtr中。
串口发送直接调用

USART_Tx(USART0, data[i]);