USART — 空闲中断接收不定长数据

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#include "at32f403a_407_board.h"
#include "at32f403a_407_clock.h"

int main(void)
{
  system_clock_config();
  at32_board_init();
  at32_led_off(LED2);
  at32_led_off(LED3);
  at32_led_off(LED4);
  usart_configuration();

  /* transmit a data */
  while(usart_flag_get(USART2, USART_TDBE_FLAG) == RESET);
  usart_data_transmit(USART2, 0x55);

  /* receive a data from the tx pin */
  while(usart_flag_get(USART2, USART_RDBF_FLAG) == RESET);
  usart_data_receive(USART2);

  while(1)
  {
  }
}