****************************************************************************
* Detailed Description:
*
* CAN <-> Ethernet gateway demo for FRDM-A-S32K344.
*
* CAN FD frames are encapsulated into raw Ethernet frames and
* transmitted over the 100BASE-TX link. Received Ethernet frames
* are decapsulated and forwarded to the CAN FD bus.
*
* Key Functionality:
* - Interrupt-driven CAN FD reception via CanIf_RxIndication callback.
* - Interrupt-driven Ethernet reception via EthIf_RxIndication callback
* (EthCtrlEnableIngressQueueInterrupt, GMAC0_CH_RX_IRQHandler).
* - GMAC TX confirmation interrupt processing (GMAC0_CH_TX_IRQHandler).
* - Custom gateway format for CAN ID, DLC, flags and
* payload (up to 64 bytes CAN FD) in a fixed 72-byte Ethernet payload.
* - PHY CAN transceiver initialization.
* - Ethernet PHY auto-detection and MDIO configuration via EthPhy driver.
* - PHY initialization selectable at compile time:
* PHY_INIT_BY_PIN_STRAPPING (default)
* PHY_INIT_BY_SOFTWARE (MDIO register write)
*
* Main Loop Flow:
* - CAN -> ETH : CanIf_bRxFlag set by ISR -> App_EthTransmit()
* - ETH -> CAN : ethReceiveFlag set by ISR -> App_CanTransmit()
*
* Notes:
* - Red LED set if Gateway_Init returns E_NOT_OK.
* - Green LED toggles upon CAN reception.
* - Blue LED toggles upon ETH reception.
* - EthIf.c contains the custom EthIf_RxIndication gateway implementation.
* - During S32 Configuration Tool code generation select "Keep Existing"
* for EthIf.c to avoid overwriting the custom callback.
* - Eth_43_GMAC_ReleaseRxBuffer() must be called unconditionally inside
* EthIf_RxIndication.
*
* -------------------------------------------------------------------------
* Test HW : FRDM-A-S32K344 Rev A
* MCU : S32K344_257BGA
* IDE : S32DS 3.6.10
* RTD : S32K3_RTD_7_0_1_D2602_ASR_REL_4_9_REV_0000_20260206
* AUTOSAR : 4.9.0
* Debugger : P&E Micro
* Target : Internal_FLASH
* CAN : CAN FD, 500 Kbps nominal / 2 Mbps data, TJA1043 transceiver
* Ethernet : RMII 100BASE-TX, DP83848 PHY
****************************************************************************
ETH Reception with Wireshark:ETH Reception with Wireshark:
CAN Reception with PCAN-USB.CAN Reception with PCAN-USB.
Note 1: Inside project you can comment NODE_1 and define NODE_2 as 1 to enable simple routine which sends out a CAN frame if SW3 is pressed, and an ETH frame if SW2 is pressed.
Note 2: For a real gateway application, use a queue or ring buffer instead of one global frame; otherwise, a second CAN frame can overwrite the first before Ethernet transmission completes. This example is for demostration purposes only.
