nBus-bridge/Core/Src/NbusCommunicator.cpp

/**
 * @file NbusCommunicator.cpp
 * @brief Implemetnácia komunikačnej vrstvy: 1) internej 2) externej
 * @date Mar 7, 2025
 * @author Juraj Dudak
 */

#include "NbusCommunicator.h"

NbusCommunicator::NbusCommunicator(UART_HandleTypeDef *uartUbus, UART_HandleTypeDef *uartMaster)
: _packet_tx(_data_packet_tx, NBUS_MAX_FRAME_SIZE, TYPE_PLAIN, CRC_ON),
  _packet_rx(_data_packet_rx, NBUS_MAX_FRAME_SIZE, TYPE_PLAIN, CRC_OFF)
{
    if (uartUbus == NULL)
    {
        while (1)
        {
            __NOP();
        }
    }
    _uart_nbus = uartUbus;

    if (uartMaster == NULL)
    {
        while (1)
        {
            __NOP();
        }
    }
    _uart_master = uartMaster;
}

NbusCommunicator::~NbusCommunicator()
{
    // empty
}

void NbusCommunicator::_receive()
{
    uint16_t received_size;
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_SET);

    memset(_data_packet_comm, 0, NBUS_MAX_FRAME_SIZE);
    // komunikacia v DMA musi byt spracovana aj tak ako blokujuca
    // takto je tu menej rezie. Timeout je 5ms
    HAL_StatusTypeDef status = HAL_UARTEx_ReceiveToIdle(_uart_nbus, _data_packet_comm, NBUS_MAX_FRAME_SIZE,
                                                        &received_size, UART_NBUS_RX_TIMEOUT);

    _packet_rx.Init();

    if (status == HAL_OK)
    {
        if (received_size > 0)
        {
            _packet_rx.FromArray(_data_packet_comm, received_size);
        }
    }

    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_RESET);

    _packet_rx.Commit();
}

DataFrame *NbusCommunicator::sendAndReceive(Nbus_pdu *pdu, uint8_t *data, uint8_t data_len)
{
    this->send(pdu, data, data_len);
    this->_receive();
    return &_packet_rx;
}

void NbusCommunicator::send(Nbus_pdu *pdu, uint8_t *data, uint8_t data_len)
{
    _packet_tx.Init();
    _packet_tx.AddInt8(pdu->ma); // Module address
    _packet_tx.AddInt8(pdu->sa); // Slave address
    _packet_tx.AddInt8(pdu->fc); // Function Code
    for (int i = 0; i < data_len; i++)
    {
        _packet_tx.AddInt8(data[i]);
    }

    int length = _packet_tx.Commit();

    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_SET);
    HAL_UART_Transmit(_uart_nbus, _packet_tx.GetFrame(), length, 10);
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_RESET);
}

void NbusCommunicator::sendToMaster(DataFrame *master_frame)
{
	if (master_frame == nullptr || master_frame->IsEmpty())
		return;

	while (_uart_master->gState != HAL_UART_STATE_READY)
    {
        __NOP(); // cakanie na ukoncenie prebiehajuceho odosielania
                 // tu to moze byt vcelku tesno odoslany dalsi paket. je tam pauza o dlzke 1.2bit
    }

    HAL_UART_Transmit_DMA(_uart_master, master_frame->GetFrame(), master_frame->GetLength());
}