nBus-bridge/Core/Src/AppBridge.cpp

/**
 * @file AppBridge.cpp
 * @brief High-level logic of nBusBridge. This is the application entry point.
 *
 * @date Nov 28, 2025
 * @author Juraj Dudak, Matus Necas
 */

#include "AppBridge.h"
#include "NbusBridge.h"


/** @brief UARTinterface between Master-Bridge. */
UART_HandleTypeDef *pUartMasterGlobal;
/** @brief flag for data-ready from pUartMasterGlobal. */
volatile uint32_t flagUartMasterDataReady;
/** @brief reading buffer from pUartMasterGlobal. */
uint8_t pMasterUartRx[NBUS_APP_UART_FRAME_SIZE];
/** @brief master buffer for pUartMasterGlobal. */
uint8_t pMasterUartFrame[NBUS_APP_UART_FRAME_SIZE];
/** @brief internal index for data acquisition from pUartMasterGlobal. */
volatile uint8_t vMasterUartIndex;
/** @brief size of received request from pUartMasterGlobal. */
volatile uint8_t vMasterUartSize;


/** Initialize resources and provide boot sequence. */
static void init_app()
{
    HAL_UARTEx_ReceiveToIdle_DMA(pUartMasterGlobal, pMasterUartRx, NBUS_APP_UART_FRAME_SIZE);
    flagUartMasterDataReady = 0;
    vMasterUartIndex = 0;
    vMasterUartSize = 0;

    // boot long blink
    for (uint32_t i = 0; i < NBUS_APP_BLINK_COUNT; i++)
    {
        HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_3);
        HAL_Delay(NBUS_APP_BLINK_DELAY);
    }
}


/**
 * Entrypoint of nBusBridge applicattion.
 * @param uart_nbus: interface for internal bridge-slave
 * @param uart_master: nterface for external bridge-master
 */
void app(UART_HandleTypeDef *uart_nbus, UART_HandleTypeDef *uart_master)
{

    pUartMasterGlobal = uart_master;
    init_app();

    NbusCommunicator nc(uart_nbus, uart_master);
    NbusBridge bridge(&nc);


    bridge.scanNetwork();

    while (1)
    {
        bridge.processRunningState();

        if (flagUartMasterDataReady > 0)
        {
            bridge.processRequest(pMasterUartFrame, flagUartMasterDataReady);
            flagUartMasterDataReady = 0;
        }
    }
}


/**
 * @brief Application callback of STM32 HAL.
 */
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
    if (huart == pUartMasterGlobal)
    {
        HAL_UARTEx_ReceiveToIdle_DMA(pUartMasterGlobal, pMasterUartRx, NBUS_APP_UART_FRAME_SIZE);
        uint8_t copy_offset = 0;

        if (vMasterUartIndex == 0)
        {
            vMasterUartSize = pMasterUartRx[0];
            vMasterUartIndex = 1;
            Size--;
            copy_offset = 1;
        }

        if (Size > 0)
        {
            memcpy(&pMasterUartFrame[vMasterUartIndex - 1], &pMasterUartRx[copy_offset], Size);
            vMasterUartIndex += Size;
        }

        if (vMasterUartIndex > vMasterUartSize)
        {
            flagUartMasterDataReady = vMasterUartSize;
            vMasterUartSize = 0;
            vMasterUartIndex = 0;
            pMasterUartRx[0] = 0;
        }
    }
}