nBus-bridge/Core/Src/NbusCommunicator.cpp

/*
 * @file NbusCommunicator.cpp
 *
 * @date: Mar 7, 2025
 * @author: juraj
 */

#include "NbusCommunicator.h"

volatile int32_t flag_data_received = -1;

NbusCommunicator::NbusCommunicator(UART_HandleTypeDef* uartUbus) {
	_packet_tx = new DataFrame (_data_packet_tx, sizeof(_data_packet_tx), TYPE_PLAIN, CRC_ON);
	if(_packet_tx == NULL)
	{
		while(1){
			__NOP();
		}
	}

	_packet_rx = new DataFrame (_data_packet_rx, sizeof(_data_packet_rx), TYPE_PLAIN, CRC_ON);\
	if(_packet_rx == NULL)
	{
		while(1){
			__NOP();
		}
	}

	if(uartUbus == NULL)
		{
			while(1){
				__NOP();
			}
		}

	_uart_nbus = uartUbus;

}

NbusCommunicator::~NbusCommunicator() {
	// TODO Auto-generated destructor stub
}


void NbusCommunicator::_receive(){
	flag_data_received = -1;
	HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_SET);
	HAL_UARTEx_ReceiveToIdle_DMA(_uart_nbus, _data_packet_comm, NBUS_MAX_FRAME_SIZE);
	uint32_t stop_receive = HAL_GetTick() + 2;

	while(flag_data_received < 0 && HAL_GetTick() < stop_receive);
	HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_RESET);
	_packet_rx->Init();
	if(flag_data_received > 0){
		_packet_rx->AddArray(_data_packet_comm, flag_data_received);
	}
	_packet_rx->Commit();

	flag_data_received = 0;
}

void NbusCommunicator::transmit(uint8_t *frame, uint8_t length){
	HAL_UART_Transmit(_uart_nbus, frame, length, 100);

	HAL_UARTEx_ReceiveToIdle_DMA(_uart_nbus, _data_packet_rx, 64);
}

DataFrame* 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);	// ECHO
	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, 100);
	HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_RESET);

	this->_receive();
	return _packet_rx;

}

//  Application callbacks
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size){
	flag_data_received = Size;
}