RS485 & ENC28J60 gateway

  • Hello MySensor friends;

    I have made a RS-485 tot ethernet gateway with a ENC28J60 Ethernet adapter, and it is working good.

    Only when i load it to the Arduino i got a warning that 97% of the dynamic memory is used.
    Is it a problem for a good working gateway?

    All the not direct needed parts i comment out, including the debug.

    The message: It is in dutch....

    De schets gebruikt 27498 bytes (85%)  programma-opslagruimte. Maximum is 32256 bytes.
    Globale variabelen gebruiken 1998 bytes (97%) van het dynamisch geheugen. Resteren 50 bytes voor lokale variabelen. Maximum is 2048 bytes.
    Weinig geheugen beschikbaar, er kunnen zich stabiliteitsproblemen voordoen

    The sketch:

    // Enable debug prints to serial monitor
    //#define MY_DEBUG
    // Enable RS485 transport layer
    #define MY_RS485
    // Define this to enables DE-pin management on defined pin
    #define MY_RS485_DE_PIN 2
    // Set RS485 baud rate to use
    #define MY_RS485_BAUD_RATE 9600
    // Enable this if RS485 is connected to a hardware serial port
    //#define MY_RS485_HWSERIAL Serial1
    // Enable serial gateway
    // Enable gateway ethernet module type
    //#define MY_GATEWAY_W5100
    #define MY_GATEWAY_ENC28J60
    // Enable MY_IP_ADDRESS here if you want a static ip address (no DHCP)
    #define MY_IP_ADDRESS 192,168,0,14
    // If using static ip you can define Gateway and Subnet address as well
    #define MY_IP_GATEWAY_ADDRESS 192,168,0,1
    #define MY_IP_SUBNET_ADDRESS 255,255,255,0
    // The port to keep open on node server mode / or port to contact in client mode
    #define MY_PORT 5003
    #define MY_MAC_ADDRESS 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x59
    //#define MY_NODE_ID 01
    //#include <Ethernet.h>
    #include <SPI.h>
    #include <UIPEthernet.h>
    #include <MySensors.h>
    void setup()
    	// Setup locally attached sensors
    void presentation()
      //sendSketchInfo("RS 485 Gateway", "1.0");
    	// Present locally attached sensors here
    void loop()
    	// Send locally attached sensors data here

  • Contest Winner

    I'm not sure, but I think it depends on whether or not the code is using large local variables. At some point it's no longer possible to claim a space on the heap, because the free heap space is to fragmented

    I have one Arduino that has a sketch with the same warning, but it's been running for a long time. No problems so far. But I've declared most of the variables global.

    This is AdaFruits article on the topic:

  • @theol

    thank you for your response and the link to the interesting document!

    The gateway has only run a few hours with 3 node's, so do not know if it goes well after days.

    As far as I could see, I turned off all unnecessary lines in the sketch.
    However, I notice the W5100 library is a lot less used, but I only have that for a UNO ....

  • I have now been running the gateway for more than half a year, and unfortunately the gateway runs regularly (about once every 2 weeks), so I am going to replace the gateway for a W5100 ethernet adapter.
    I used it in a second gateway, and this gateway is stable, I haven't had any crashes in about 4 months.

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