ChibiOS Free Embedded RTOS

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void EthernetTxThread(void*) {
    chRegSetThreadName("ethtx");
    systime_t prev = chVTGetSystemTime();
    while(1) {
        chSysLock();
        chThdSuspendS(&trp);
        chSysUnlock();
        sendResponse();
    }
}

void EthernetRxThread(void*) {
    chRegSetThreadName("ethrx");
    systime_t prev = chVTGetSystemTime();
    while(1) {
        if (parseMessage() != -1)
            chThdResume(&trp, MSG_OK);
    }
}

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int len = recvfrom(sock, recv_buf, sizeof(recv_buf), 0, (struct sockaddr*) &eth_rx_addr, (socklen_t *)sizeof(eth_rx_addr));

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sys_arch_mbox_fetch(&conn->recvmbox, &buf, 0);

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OSAL_IRQ_HANDLER(STM32_ETH_HANDLER) {
  MACDriver *macp = &ETHD1;
  uint32_t dmacsr;

  OSAL_IRQ_PROLOGUE();

  dmacsr = ETH->DMACSR;
  ETH->DMACSR = dmacsr; /* Clear status bits.*/

  if ((dmacsr & (ETH_DMACSR_RI | ETH_DMACSR_TI)) != 0U) {
    if ((dmacsr & ETH_DMACSR_TI) != 0U) {
      /* Data Transmitted.*/
      __mac_tx_wakeup(macp);
    }

    if ((dmacsr & ETH_DMACSR_RI) != 0U) {
      palClearLine(LINE_A);
      /* Data Received.*/
      __mac_rx_wakeup(macp);
      palSetLine(LINE_A);
    }

    __mac_callback(macp);
  }