ChibiOS Free Embedded RTOS

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int main(void) {

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();

  /*
   * Activates the UART driver 2, PA2(TX) and PA3(RX) are routed to USART2.
   */
  uartStart(&UARTD1, &uart_cfg_1);
  palSetPadMode(GPIOA, 9, PAL_MODE_ALTERNATE(7));
  palSetPadMode(GPIOA, 10, PAL_MODE_ALTERNATE(7));


  /*
   * Normal main() thread activity, in this demo it does nothing.
   */
  while (TRUE) {
    if (palReadPad(GPIOA, GPIOA_BUTTON)) {
      /*
       * Starts both a transmission and a receive operations, both will be
       * handled entirely in background.
       */
      uartStopReceive(&UARTD1);
      uartStopSend(&UARTD1);
      uartStartReceive(&UARTD1, 16, buffer);
      uartStartSend(&UARTD1, 16, message);
    }
    chThdSleepMilliseconds(500);
  }
}